Merge branch '28' into custom-manipulatorscustom-manipulators

99 files changed, 4643 insertions, 2871 deletions

diff --git a/source/blender/blenkernel/intern/DerivedMesh.c b/source/blender/blenkernel/intern/DerivedMesh.c
index 55d5f6f89a1..18db368ee2b 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -96,6 +96,10 @@ static DerivedMesh *navmesh_dm_createNavMeshForVisualization(DerivedMesh *dm);
 #  define ASSERT_IS_VALID_DM(dm)
 #endif
 
+
+static ThreadRWMutex loops_cache_lock = PTHREAD_RWLOCK_INITIALIZER;
+
+
 static void add_shapekey_layers(DerivedMesh *dm, Mesh *me, Object *ob);
 static void shapekey_layers_to_keyblocks(DerivedMesh *dm, Mesh *me, int actshape_uid);
 
@@ -238,6 +242,30 @@ static int dm_getNumLoopTri(DerivedMesh *dm)
 	return numlooptris;
 }
 
+static const MLoopTri *dm_getLoopTriArray(DerivedMesh *dm)
+{
+	MLoopTri *looptri;
+
+	BLI_rw_mutex_lock(&loops_cache_lock, THREAD_LOCK_READ);
+	looptri = dm->looptris.array;
+	BLI_rw_mutex_unlock(&loops_cache_lock);
+
+	if (looptri != NULL) {
+		BLI_assert(dm->getNumLoopTri(dm) == dm->looptris.num);
+	}
+	else {
+		BLI_rw_mutex_lock(&loops_cache_lock, THREAD_LOCK_WRITE);
+		/* We need to ensure array is still NULL inside mutex-protected code, some other thread might have already
+		 * recomputed those looptris. */
+		if (dm->looptris.array == NULL) {
+			dm->recalcLoopTri(dm);
+		}
+		looptri = dm->looptris.array;
+		BLI_rw_mutex_unlock(&loops_cache_lock);
+	}
+	return looptri;
+}
+
 static CustomData *dm_getVertCData(DerivedMesh *dm)
 {
 	return &dm->vertData;
@@ -281,6 +309,8 @@ void DM_init_funcs(DerivedMesh *dm)
 	dm->dupLoopArray = dm_dupLoopArray;
 	dm->dupPolyArray = dm_dupPolyArray;
 
+	dm->getLoopTriArray = dm_getLoopTriArray;
+
 	/* subtypes handle getting actual data */
 	dm->getNumLoopTri = dm_getNumLoopTri;
 
@@ -475,6 +505,8 @@ void DM_ensure_tessface(DerivedMesh *dm)
 
 /**
  * Ensure the array is large enough
+ *
+ * /note This function must always be thread-protected by caller. It should only be used by internal code.
  */
 void DM_ensure_looptri_data(DerivedMesh *dm)
 {
@@ -482,18 +514,22 @@ void DM_ensure_looptri_data(DerivedMesh *dm)
 	const unsigned int totloop = dm->numLoopData;
 	const int looptris_num = poly_to_tri_count(totpoly, totloop);
 
+	BLI_assert(dm->looptris.array_wip == NULL);
+
+	SWAP(MLoopTri *, dm->looptris.array, dm->looptris.array_wip);
+
 	if ((looptris_num > dm->looptris.num_alloc) ||
 	    (looptris_num < dm->looptris.num_alloc * 2) ||
 	    (totpoly == 0))
 	{
-		MEM_SAFE_FREE(dm->looptris.array);
+		MEM_SAFE_FREE(dm->looptris.array_wip);
 		dm->looptris.num_alloc = 0;
 		dm->looptris.num = 0;
 	}
 
 	if (totpoly) {
-		if (dm->looptris.array == NULL) {
-			dm->looptris.array = MEM_mallocN(sizeof(*dm->looptris.array) * looptris_num, __func__);
+		if (dm->looptris.array_wip == NULL) {
+			dm->looptris.array_wip = MEM_mallocN(sizeof(*dm->looptris.array_wip) * looptris_num, __func__);
 			dm->looptris.num_alloc = looptris_num;
 		}
 
@@ -501,19 +537,6 @@ void DM_ensure_looptri_data(DerivedMesh *dm)
 	}
 }
 
-/**
- * The purpose of this function is that we can call:
- * `dm->getLoopTriArray(dm)` and get the array returned.
- */
-void DM_ensure_looptri(DerivedMesh *dm)
-{
-	const int numPolys =  dm->getNumPolys(dm);
-
-	if ((dm->looptris.num == 0) && (numPolys != 0)) {
-		dm->recalcLoopTri(dm);
-	}
-}
-
 void DM_verttri_from_looptri(MVertTri *verttri, const MLoop *mloop, const MLoopTri *looptri, int looptri_num)
 {
 	int i;
@@ -1126,7 +1149,7 @@ DerivedMesh *mesh_create_derived(Mesh *me, float (*vertCos)[3])
 }
 
 DerivedMesh *mesh_create_derived_for_modifier(
-        Scene *scene, Object *ob,
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob,
         ModifierData *md, int build_shapekey_layers)
 {
 	Mesh *me = ob->data;
@@ -1152,7 +1175,7 @@ DerivedMesh *mesh_create_derived_for_modifier(
 		int numVerts;
 		float (*deformedVerts)[3] = BKE_mesh_vertexCos_get(me, &numVerts);
 
-		modwrap_deformVerts(md, ob, NULL, deformedVerts, numVerts, 0);
+		modwrap_deformVerts(md, eval_ctx, ob, NULL, deformedVerts, numVerts, 0);
 		dm = mesh_create_derived(me, deformedVerts);
 
 		if (build_shapekey_layers)
@@ -1166,7 +1189,7 @@ DerivedMesh *mesh_create_derived_for_modifier(
 		if (build_shapekey_layers)
 			add_shapekey_layers(tdm, me, ob);
 		
-		dm = modwrap_applyModifier(md, ob, tdm, 0);
+		dm = modwrap_applyModifier(md, eval_ctx, ob, tdm, 0);
 		ASSERT_IS_VALID_DM(dm);
 
 		if (tdm != dm) tdm->release(tdm);
@@ -1732,7 +1755,7 @@ static void dm_ensure_display_normals(DerivedMesh *dm)
  * - apply deform modifiers and input vertexco
  */
 static void mesh_calc_modifiers(
-        Scene *scene, Object *ob, float (*inputVertexCos)[3],
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float (*inputVertexCos)[3],
         const bool useRenderParams, int useDeform,
         const bool need_mapping, CustomDataMask dataMask,
         const int index, const bool useCache, const bool build_shapekey_layers,
@@ -1843,7 +1866,7 @@ static void mesh_calc_modifiers(
 				if (!deformedVerts)
 					deformedVerts = BKE_mesh_vertexCos_get(me, &numVerts);
 
-				modwrap_deformVerts(md, ob, NULL, deformedVerts, numVerts, deform_app_flags);
+				modwrap_deformVerts(md, eval_ctx, ob, NULL, deformedVerts, numVerts, deform_app_flags);
 			}
 			else {
 				break;
@@ -1984,7 +2007,7 @@ static void mesh_calc_modifiers(
 				}
 			}
 
-			modwrap_deformVerts(md, ob, dm, deformedVerts, numVerts, deform_app_flags);
+			modwrap_deformVerts(md, eval_ctx, ob, dm, deformedVerts, numVerts, deform_app_flags);
 		}
 		else {
 			DerivedMesh *ndm;
@@ -2059,7 +2082,7 @@ static void mesh_calc_modifiers(
 				}
 			}
 
-			ndm = modwrap_applyModifier(md, ob, dm, app_flags);
+			ndm = modwrap_applyModifier(md, eval_ctx, ob, dm, app_flags);
 			ASSERT_IS_VALID_DM(ndm);
 
 			if (ndm) {
@@ -2086,7 +2109,7 @@ static void mesh_calc_modifiers(
 				                 (mti->requiredDataMask ?
 				                  mti->requiredDataMask(ob, md) : 0));
 
-				ndm = modwrap_applyModifier(md, ob, orcodm, (app_flags & ~MOD_APPLY_USECACHE) | MOD_APPLY_ORCO);
+				ndm = modwrap_applyModifier(md, eval_ctx, ob, orcodm, (app_flags & ~MOD_APPLY_USECACHE) | MOD_APPLY_ORCO);
 				ASSERT_IS_VALID_DM(ndm);
 
 				if (ndm) {
@@ -2104,7 +2127,7 @@ static void mesh_calc_modifiers(
 				nextmask &= ~CD_MASK_CLOTH_ORCO;
 				DM_set_only_copy(clothorcodm, nextmask | CD_MASK_ORIGINDEX);
 
-				ndm = modwrap_applyModifier(md, ob, clothorcodm, (app_flags & ~MOD_APPLY_USECACHE) | MOD_APPLY_ORCO);
+				ndm = modwrap_applyModifier(md, eval_ctx, ob, clothorcodm, (app_flags & ~MOD_APPLY_USECACHE) | MOD_APPLY_ORCO);
 				ASSERT_IS_VALID_DM(ndm);
 
 				if (ndm) {
@@ -2203,7 +2226,6 @@ static void mesh_calc_modifiers(
 		if (dataMask & CD_MASK_MFACE) {
 			DM_ensure_tessface(finaldm);
 		}
-		DM_ensure_looptri(finaldm);
 
 		/* without this, drawing ngon tri's faces will show ugly tessellated face
 		 * normals and will also have to calculate normals on the fly, try avoid
@@ -2288,8 +2310,8 @@ bool editbmesh_modifier_is_enabled(Scene *scene, ModifierData *md, DerivedMesh *
 }
 
 static void editbmesh_calc_modifiers(
-        Scene *scene, Object *ob, BMEditMesh *em,
-        CustomDataMask dataMask,
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob,
+        BMEditMesh *em, CustomDataMask dataMask,
         /* return args */
         DerivedMesh **r_cage, DerivedMesh **r_final)
 {
@@ -2376,9 +2398,9 @@ static void editbmesh_calc_modifiers(
 			}
 
 			if (mti->deformVertsEM)
-				modwrap_deformVertsEM(md, ob, em, dm, deformedVerts, numVerts);
+				modwrap_deformVertsEM(md, eval_ctx, ob, em, dm, deformedVerts, numVerts);
 			else
-				modwrap_deformVerts(md, ob, dm, deformedVerts, numVerts, 0);
+				modwrap_deformVerts(md, eval_ctx, ob, dm, deformedVerts, numVerts, 0);
 		}
 		else {
 			DerivedMesh *ndm;
@@ -2423,10 +2445,10 @@ static void editbmesh_calc_modifiers(
 				DM_set_only_copy(orcodm, mask | CD_MASK_ORIGINDEX);
 
 				if (mti->applyModifierEM) {
-					ndm = modwrap_applyModifierEM(md, ob, em, orcodm, MOD_APPLY_ORCO);
+					ndm = modwrap_applyModifierEM(md, eval_ctx, ob, em, orcodm, MOD_APPLY_ORCO);
 				}
 				else {
-					ndm = modwrap_applyModifier(md, ob, orcodm, MOD_APPLY_ORCO);
+					ndm = modwrap_applyModifier(md, eval_ctx, ob, orcodm, MOD_APPLY_ORCO);
 				}
 				ASSERT_IS_VALID_DM(ndm);
 
@@ -2451,9 +2473,9 @@ static void editbmesh_calc_modifiers(
 			}
 
 			if (mti->applyModifierEM)
-				ndm = modwrap_applyModifierEM(md, ob, em, dm, MOD_APPLY_USECACHE | MOD_APPLY_ALLOW_GPU);
+				ndm = modwrap_applyModifierEM(md, eval_ctx, ob, em, dm, MOD_APPLY_USECACHE | MOD_APPLY_ALLOW_GPU);
 			else
-				ndm = modwrap_applyModifier(md, ob, dm, MOD_APPLY_USECACHE | MOD_APPLY_ALLOW_GPU);
+				ndm = modwrap_applyModifier(md, eval_ctx, ob, dm, MOD_APPLY_USECACHE | MOD_APPLY_ALLOW_GPU);
 			ASSERT_IS_VALID_DM(ndm);
 
 			if (ndm) {
@@ -2605,7 +2627,8 @@ static bool calc_modifiers_skip_orco(Scene *scene,
 		else if ((ob->mode & (OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT | OB_MODE_TEXTURE_PAINT)) != 0) {
 			return false;
 		}
-		else if ((DEG_get_eval_flags_for_id(scene->depsgraph, &ob->id) & DAG_EVAL_NEED_CPU) != 0) {
+		/* TODO(sergey): How do we get depsgraph here? */
+		else if ((DEG_get_eval_flags_for_id(scene->depsgraph_legacy, &ob->id) & DAG_EVAL_NEED_CPU) != 0) {
 			return false;
 		}
 		SubsurfModifierData *smd = (SubsurfModifierData *)last_md;
@@ -2617,7 +2640,7 @@ static bool calc_modifiers_skip_orco(Scene *scene,
 #endif
 
 static void mesh_build_data(
-        Scene *scene, Object *ob, CustomDataMask dataMask,
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, CustomDataMask dataMask,
         const bool build_shapekey_layers, const bool need_mapping)
 {
 	BLI_assert(ob->type == OB_MESH);
@@ -2632,7 +2655,7 @@ static void mesh_build_data(
 #endif
 
 	mesh_calc_modifiers(
-	        scene, ob, NULL, false, 1, need_mapping, dataMask, -1, true, build_shapekey_layers,
+	        eval_ctx, scene, ob, NULL, false, 1, need_mapping, dataMask, -1, true, build_shapekey_layers,
 	        true,
 	        &ob->derivedDeform, &ob->derivedFinal);
 
@@ -2643,17 +2666,19 @@ static void mesh_build_data(
 	ob->lastDataMask = dataMask;
 	ob->lastNeedMapping = need_mapping;
 
-	if ((ob->mode & OB_MODE_SCULPT) && ob->sculpt) {
+	if ((ob->mode & OB_MODE_ALL_SCULPT) && ob->sculpt) {
 		/* create PBVH immediately (would be created on the fly too,
 		 * but this avoids waiting on first stroke) */
 
-		BKE_sculpt_update_mesh_elements(scene, scene->toolsettings->sculpt, ob, false, false);
+		BKE_sculpt_update_mesh_elements(eval_ctx, scene, scene->toolsettings->sculpt, ob, false, false);
 	}
 
 	BLI_assert(!(ob->derivedFinal->dirty & DM_DIRTY_NORMALS));
 }
 
-static void editbmesh_build_data(Scene *scene, Object *obedit, BMEditMesh *em, CustomDataMask dataMask)
+static void editbmesh_build_data(
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *obedit, BMEditMesh *em, CustomDataMask dataMask)
 {
 	BKE_object_free_derived_caches(obedit);
 	BKE_object_sculpt_modifiers_changed(obedit);
@@ -2667,7 +2692,7 @@ static void editbmesh_build_data(Scene *scene, Object *obedit, BMEditMesh *em, C
 #endif
 
 	editbmesh_calc_modifiers(
-	        scene, obedit, em, dataMask,
+	        eval_ctx, scene, obedit, em, dataMask,
 	        &em->derivedCage, &em->derivedFinal);
 
 	DM_set_object_boundbox(obedit, em->derivedFinal);
@@ -2682,7 +2707,7 @@ static void editbmesh_build_data(Scene *scene, Object *obedit, BMEditMesh *em, C
 static CustomDataMask object_get_datamask(const Scene *scene, Object *ob, bool *r_need_mapping)
 {
 	/* TODO(sergey): Avoid this linear list lookup. */
-	SceneLayer *sl = BKE_scene_layer_context_active(scene);
+	SceneLayer *sl = BKE_scene_layer_context_active_PLACEHOLDER(scene);
 	Object *actob = sl->basact ? sl->basact->object : NULL;
 	CustomDataMask mask = ob->customdata_mask;
 
@@ -2720,23 +2745,24 @@ static CustomDataMask object_get_datamask(const Scene *scene, Object *ob, bool *
 }
 
 void makeDerivedMesh(
-        Scene *scene, Object *ob, BMEditMesh *em,
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, BMEditMesh *em,
         CustomDataMask dataMask, const bool build_shapekey_layers)
 {
 	bool need_mapping;
 	dataMask |= object_get_datamask(scene, ob, &need_mapping);
 
 	if (em) {
-		editbmesh_build_data(scene, ob, em, dataMask);
+		editbmesh_build_data(eval_ctx, scene, ob, em, dataMask);
 	}
 	else {
-		mesh_build_data(scene, ob, dataMask, build_shapekey_layers, need_mapping);
+		mesh_build_data(eval_ctx, scene, ob, dataMask, build_shapekey_layers, need_mapping);
 	}
 }
 
 /***/
 
-DerivedMesh *mesh_get_derived_final(Scene *scene, Object *ob, CustomDataMask dataMask)
+DerivedMesh *mesh_get_derived_final(
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, CustomDataMask dataMask)
 {
 	/* if there's no derived mesh or the last data mask used doesn't include
 	 * the data we need, rebuild the derived mesh
@@ -2748,14 +2774,14 @@ DerivedMesh *mesh_get_derived_final(Scene *scene, Object *ob, CustomDataMask dat
 	    ((dataMask & ob->lastDataMask) != dataMask) ||
 	    (need_mapping != ob->lastNeedMapping))
 	{
-		mesh_build_data(scene, ob, dataMask, false, need_mapping);
+		mesh_build_data(eval_ctx, scene, ob, dataMask, false, need_mapping);
 	}
 
 	if (ob->derivedFinal) { BLI_assert(!(ob->derivedFinal->dirty & DM_DIRTY_NORMALS)); }
 	return ob->derivedFinal;
 }
 
-DerivedMesh *mesh_get_derived_deform(Scene *scene, Object *ob, CustomDataMask dataMask)
+DerivedMesh *mesh_get_derived_deform(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, CustomDataMask dataMask)
 {
 	/* if there's no derived mesh or the last data mask used doesn't include
 	 * the data we need, rebuild the derived mesh
@@ -2768,37 +2794,37 @@ DerivedMesh *mesh_get_derived_deform(Scene *scene, Object *ob, CustomDataMask da
 	    ((dataMask & ob->lastDataMask) != dataMask) ||
 	    (need_mapping != ob->lastNeedMapping))
 	{
-		mesh_build_data(scene, ob, dataMask, false, need_mapping);
+		mesh_build_data(eval_ctx, scene, ob, dataMask, false, need_mapping);
 	}
 
 	return ob->derivedDeform;
 }
 
-DerivedMesh *mesh_create_derived_render(Scene *scene, Object *ob, CustomDataMask dataMask)
+DerivedMesh *mesh_create_derived_render(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, CustomDataMask dataMask)
 {
 	DerivedMesh *final;
 	
 	mesh_calc_modifiers(
-	        scene, ob, NULL, true, 1, false, dataMask, -1, false, false, false,
+	        eval_ctx, scene, ob, NULL, true, 1, false, dataMask, -1, false, false, false,
 	        NULL, &final);
 
 	return final;
 }
 
-DerivedMesh *mesh_create_derived_index_render(Scene *scene, Object *ob, CustomDataMask dataMask, int index)
+DerivedMesh *mesh_create_derived_index_render(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, CustomDataMask dataMask, int index)
 {
 	DerivedMesh *final;
 
 	mesh_calc_modifiers(
-	        scene, ob, NULL, true, 1, false, dataMask, index, false, false, false,
+	        eval_ctx, scene, ob, NULL, true, 1, false, dataMask, index, false, false, false,
 	        NULL, &final);
 
 	return final;
 }
 
 DerivedMesh *mesh_create_derived_view(
-        Scene *scene, Object *ob,
-        CustomDataMask dataMask)
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, CustomDataMask dataMask)
 {
 	DerivedMesh *final;
 
@@ -2809,7 +2835,7 @@ DerivedMesh *mesh_create_derived_view(
 	ob->transflag |= OB_NO_PSYS_UPDATE;
 
 	mesh_calc_modifiers(
-	        scene, ob, NULL, false, 1, false, dataMask, -1, false, false, false,
+	        eval_ctx, scene, ob, NULL, false, 1, false, dataMask, -1, false, false, false,
 	        NULL, &final);
 
 	ob->transflag &= ~OB_NO_PSYS_UPDATE;
@@ -2818,53 +2844,53 @@ DerivedMesh *mesh_create_derived_view(
 }
 
 DerivedMesh *mesh_create_derived_no_deform(
-        Scene *scene, Object *ob, float (*vertCos)[3],
-        CustomDataMask dataMask)
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob,
+        float (*vertCos)[3], CustomDataMask dataMask)
 {
 	DerivedMesh *final;
 	
 	mesh_calc_modifiers(
-	        scene, ob, vertCos, false, 0, false, dataMask, -1, false, false, false,
+	        eval_ctx, scene, ob, vertCos, false, 0, false, dataMask, -1, false, false, false,
 	        NULL, &final);
 
 	return final;
 }
 
 DerivedMesh *mesh_create_derived_no_virtual(
-        Scene *scene, Object *ob, float (*vertCos)[3],
-        CustomDataMask dataMask)
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob,
+        float (*vertCos)[3], CustomDataMask dataMask)
 {
 	DerivedMesh *final;
 	
 	mesh_calc_modifiers(
-	        scene, ob, vertCos, false, -1, false, dataMask, -1, false, false, false,
+	        eval_ctx, scene, ob, vertCos, false, -1, false, dataMask, -1, false, false, false,
 	        NULL, &final);
 
 	return final;
 }
 
 DerivedMesh *mesh_create_derived_physics(
-        Scene *scene, Object *ob, float (*vertCos)[3],
-        CustomDataMask dataMask)
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob,
+        float (*vertCos)[3], CustomDataMask dataMask)
 {
 	DerivedMesh *final;
 	
 	mesh_calc_modifiers(
-	        scene, ob, vertCos, false, -1, true, dataMask, -1, false, false, false,
+	        eval_ctx, scene, ob, vertCos, false, -1, true, dataMask, -1, false, false, false,
 	        NULL, &final);
 
 	return final;
 }
 
 DerivedMesh *mesh_create_derived_no_deform_render(
-        Scene *scene, Object *ob,
-        float (*vertCos)[3],
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, float (*vertCos)[3],
         CustomDataMask dataMask)
 {
 	DerivedMesh *final;
 
 	mesh_calc_modifiers(
-	        scene, ob, vertCos, true, 0, false, dataMask, -1, false, false, false,
+	        eval_ctx, scene, ob, vertCos, true, 0, false, dataMask, -1, false, false, false,
 	        NULL, &final);
 
 	return final;
@@ -2873,7 +2899,7 @@ DerivedMesh *mesh_create_derived_no_deform_render(
 /***/
 
 DerivedMesh *editbmesh_get_derived_cage_and_final(
-        Scene *scene, Object *obedit, BMEditMesh *em,
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *obedit, BMEditMesh *em,
         CustomDataMask dataMask,
         /* return args */
         DerivedMesh **r_final)
@@ -2886,7 +2912,7 @@ DerivedMesh *editbmesh_get_derived_cage_and_final(
 	if (!em->derivedCage ||
 	    (em->lastDataMask & dataMask) != dataMask)
 	{
-		editbmesh_build_data(scene, obedit, em, dataMask);
+		editbmesh_build_data(eval_ctx, scene, obedit, em, dataMask);
 	}
 
 	*r_final = em->derivedFinal;
@@ -2894,7 +2920,9 @@ DerivedMesh *editbmesh_get_derived_cage_and_final(
 	return em->derivedCage;
 }
 
-DerivedMesh *editbmesh_get_derived_cage(Scene *scene, Object *obedit, BMEditMesh *em, CustomDataMask dataMask)
+DerivedMesh *editbmesh_get_derived_cage(
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *obedit, BMEditMesh *em,
+        CustomDataMask dataMask)
 {
 	/* if there's no derived mesh or the last data mask used doesn't include
 	 * the data we need, rebuild the derived mesh
@@ -2904,7 +2932,7 @@ DerivedMesh *editbmesh_get_derived_cage(Scene *scene, Object *obedit, BMEditMesh
 	if (!em->derivedCage ||
 	    (em->lastDataMask & dataMask) != dataMask)
 	{
-		editbmesh_build_data(scene, obedit, em, dataMask);
+		editbmesh_build_data(eval_ctx, scene, obedit, em, dataMask);
 	}
 
 	return em->derivedCage;
@@ -3054,14 +3082,23 @@ void DM_calc_tangents_names_from_gpu(
 	*r_tangent_names_count = count;
 }
 
+void DM_add_named_tangent_layer_for_uv(
+        CustomData *uv_data, CustomData *tan_data, int numLoopData,
+        const char *layer_name)
+{
+	if (CustomData_get_named_layer_index(tan_data, CD_TANGENT, layer_name) == -1 &&
+	    CustomData_get_named_layer_index(uv_data, CD_MLOOPUV, layer_name) != -1)
+	{
+		CustomData_add_layer_named(
+		        tan_data, CD_TANGENT, CD_CALLOC, NULL,
+		        numLoopData, layer_name);
+	}
+}
+
 void DM_calc_loop_tangents(
         DerivedMesh *dm, bool calc_active_tangent,
         const char (*tangent_names)[MAX_NAME], int tangent_names_len)
 {
-	if (CustomData_number_of_layers(&dm->loopData, CD_MLOOPUV) == 0) {
-		return;
-	}
-
 	BKE_mesh_calc_loop_tangent_ex(
 	        dm->getVertArray(dm),
 	        dm->getPolyArray(dm), dm->getNumPolys(dm),
@@ -3941,35 +3978,3 @@ MFace *DM_get_tessface_array(DerivedMesh *dm, bool *r_allocated)
 
 	return mface;
 }
-
-const MLoopTri *DM_get_looptri_array(
-        DerivedMesh *dm,
-        const MVert *mvert,
-        const MPoly *mpoly, int mpoly_len,
-        const MLoop *mloop, int mloop_len,
-        bool *r_allocated)
-{
-	const MLoopTri *looptri = dm->getLoopTriArray(dm);
-	*r_allocated = false;
-
-	if (looptri == NULL) {
-		if (mpoly_len > 0) {
-			const int looptris_num = poly_to_tri_count(mpoly_len, mloop_len);
-			MLoopTri *looptri_data;
-
-			looptri_data = MEM_mallocN(sizeof(MLoopTri) * looptris_num, __func__);
-
-			BKE_mesh_recalc_looptri(
-			        mloop, mpoly,
-			        mvert,
-			        mloop_len, mpoly_len,
-			        looptri_data);
-
-			looptri = looptri_data;
-
-			*r_allocated = true;
-		}
-	}
-
-	return looptri;
-}
diff --git a/source/blender/blenkernel/intern/action.c b/source/blender/blenkernel/intern/action.c
index 8a94d4b8666..6f7b3286e40 100644
--- a/source/blender/blenkernel/intern/action.c
+++ b/source/blender/blenkernel/intern/action.c
@@ -89,7 +89,7 @@ bAction *add_empty_action(Main *bmain, const char name[])
 {
 	bAction *act;
 	
-	act = BKE_libblock_alloc(bmain, ID_AC, name);
+	act = BKE_libblock_alloc(bmain, ID_AC, name, 0);
 	
 	return act;
 }	
@@ -121,46 +121,56 @@ void BKE_action_free(bAction *act)
 
 /* .................................. */
 
-bAction *BKE_action_copy(Main *bmain, const bAction *src)
+/**
+ * Only copy internal data of Action ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_action_copy_data(Main *UNUSED(bmain), bAction *act_dst, const bAction *act_src, const int UNUSED(flag))
 {
-	bAction *dst = NULL;
-	bActionGroup *dgrp, *sgrp;
-	FCurve *dfcu, *sfcu;
-	
-	if (src == NULL) 
-		return NULL;
-	dst = BKE_libblock_copy(bmain, &src->id);
-	
+	bActionGroup *grp_dst, *grp_src;
+	FCurve *fcu_dst, *fcu_src;
+
 	/* duplicate the lists of groups and markers */
-	BLI_duplicatelist(&dst->groups, &src->groups);
-	BLI_duplicatelist(&dst->markers, &src->markers);
-	
+	BLI_duplicatelist(&act_dst->groups, &act_src->groups);
+	BLI_duplicatelist(&act_dst->markers, &act_src->markers);
+
 	/* copy F-Curves, fixing up the links as we go */
-	BLI_listbase_clear(&dst->curves);
-	
-	for (sfcu = src->curves.first; sfcu; sfcu = sfcu->next) {
+	BLI_listbase_clear(&act_dst->curves);
+
+	for (fcu_src = act_src->curves.first; fcu_src; fcu_src = fcu_src->next) {
 		/* duplicate F-Curve */
-		dfcu = copy_fcurve(sfcu);
-		BLI_addtail(&dst->curves, dfcu);
-		
+		fcu_dst = copy_fcurve(fcu_src);  /* XXX TODO pass subdata flag? But surprisingly does not seem to be doing any ID refcounting... */
+		BLI_addtail(&act_dst->curves, fcu_dst);
+
 		/* fix group links (kindof bad list-in-list search, but this is the most reliable way) */
-		for (dgrp = dst->groups.first, sgrp = src->groups.first; dgrp && sgrp; dgrp = dgrp->next, sgrp = sgrp->next) {
-			if (sfcu->grp == sgrp) {
-				dfcu->grp = dgrp;
-				
-				if (dgrp->channels.first == sfcu)
-					dgrp->channels.first = dfcu;
-				if (dgrp->channels.last == sfcu)
-					dgrp->channels.last = dfcu;
-					
+		for (grp_dst = act_dst->groups.first, grp_src = act_src->groups.first;
+		     grp_dst && grp_src;
+		     grp_dst = grp_dst->next, grp_src = grp_src->next)
+		{
+			if (fcu_src->grp == grp_src) {
+				fcu_dst->grp = grp_dst;
+
+				if (grp_dst->channels.first == fcu_src) {
+					grp_dst->channels.first = fcu_dst;
+				}
+				if (grp_dst->channels.last == fcu_src) {
+					grp_dst->channels.last = fcu_dst;
+				}
 				break;
 			}
 		}
 	}
-	
-	BKE_id_copy_ensure_local(bmain, &src->id, &dst->id);
+}
 
-	return dst;
+bAction *BKE_action_copy(Main *bmain, const bAction *act_src)
+{
+	bAction *act_copy;
+	BKE_id_copy_ex(bmain, &act_src->id, (ID **)&act_copy, 0, false);
+	return act_copy;
 }
 
 /* *************** Action Groups *************** */
@@ -524,7 +534,7 @@ const char *BKE_pose_ikparam_get_name(bPose *pose)
  *
  * \param dst  Should be freed already, makes entire duplicate.
  */
-void BKE_pose_copy_data(bPose **dst, const bPose *src, const bool copy_constraints)
+void BKE_pose_copy_data_ex(bPose **dst, const bPose *src, const int flag, const bool copy_constraints)
 {
 	bPose *outPose;
 	bPoseChannel *pchan;
@@ -554,9 +564,8 @@ void BKE_pose_copy_data(bPose **dst, const bPose *src, const bool copy_constrain
 	outPose->avs = src->avs;
 	
 	for (pchan = outPose->chanbase.first; pchan; pchan = pchan->next) {
-
-		if (pchan->custom) {
-			id_us_plus(&pchan->custom->id);
+		if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+			id_us_plus((ID *)pchan->custom);
 		}
 
 		/* warning, O(n2) here, if done without the hash, but these are rarely used features. */
@@ -571,13 +580,13 @@ void BKE_pose_copy_data(bPose **dst, const bPose *src, const bool copy_constrain
 		}
 
 		if (copy_constraints) {
-			BKE_constraints_copy(&listb, &pchan->constraints, true);  // BKE_constraints_copy NULLs listb
+			BKE_constraints_copy_ex(&listb, &pchan->constraints, flag, true);  // BKE_constraints_copy NULLs listb
 			pchan->constraints = listb;
 			pchan->mpath = NULL; /* motion paths should not get copied yet... */
 		}
 		
 		if (pchan->prop) {
-			pchan->prop = IDP_CopyProperty(pchan->prop);
+			pchan->prop = IDP_CopyProperty_ex(pchan->prop, flag);
 		}
 
 		pchan->draw_data = NULL;  /* Drawing cache, no need to copy. */
@@ -591,6 +600,11 @@ void BKE_pose_copy_data(bPose **dst, const bPose *src, const bool copy_constrain
 	*dst = outPose;
 }
 
+void BKE_pose_copy_data(bPose **dst, const bPose *src, const bool copy_constraints)
+{
+	BKE_pose_copy_data_ex(dst, src, 0, copy_constraints);
+}
+
 void BKE_pose_itasc_init(bItasc *itasc)
 {
 	if (itasc) {
@@ -1121,9 +1135,13 @@ void calc_action_range(const bAction *act, float *start, float *end, short incl_
 			if (fcu->totvert) {
 				float nmin, nmax;
 				
-				/* get extents for this curve */
-				/* TODO: allow enabling/disabling this? */
-				calc_fcurve_range(fcu, &nmin, &nmax, false, true);
+				/* get extents for this curve
+				 * - no "selected only", since this is often used in the backend
+				 * - no "minimum length" (we will apply this later), otherwise
+				 *   single-keyframe curves will increase the overall length by
+				 *   a phantom frame (T50354)
+				 */
+				calc_fcurve_range(fcu, &nmin, &nmax, false, false);
 				
 				/* compare to the running tally */
 				min = min_ff(min, nmin);
@@ -1176,7 +1194,9 @@ void calc_action_range(const bAction *act, float *start, float *end, short incl_
 	}
 	
 	if (foundvert || foundmod) {
+		/* ensure that action is at least 1 frame long (for NLA strips to have a valid length) */
 		if (min == max) max += 1.0f;
+		
 		*start = min;
 		*end = max;
 	}
diff --git a/source/blender/blenkernel/intern/anim.c b/source/blender/blenkernel/intern/anim.c
index 59484724aee..34ab8a064d4 100644
--- a/source/blender/blenkernel/intern/anim.c
+++ b/source/blender/blenkernel/intern/anim.c
@@ -43,6 +43,7 @@
 #include "DNA_key_types.h"
 #include "DNA_scene_types.h"
 
+#include "BKE_context.h"
 #include "BKE_curve.h"
 #include "BKE_global.h"
 #include "BKE_key.h"
@@ -282,10 +283,11 @@ void animviz_get_object_motionpaths(Object *ob, ListBase *targets)
  */
 
 /* tweak the object ordering to trick depsgraph into making MotionPath calculations run faster */
-static void motionpaths_calc_optimise_depsgraph(Scene *scene, ListBase *targets)
+static void motionpaths_calc_optimise_depsgraph(bContext *C, Scene *scene, ListBase *targets)
 {
 	BaseLegacy *base, *baseNext;
 	MPathTarget *mpt;
+	Main *bmain = CTX_data_main(C);
 	
 	/* make sure our temp-tag isn't already in use */
 	for (base = scene->base.first; base; base = base->next)
@@ -309,7 +311,7 @@ static void motionpaths_calc_optimise_depsgraph(Scene *scene, ListBase *targets)
 	}
 	
 	/* "brew me a list that's sorted a bit faster now depsy" */
-	DEG_scene_relations_rebuild(G.main, scene);
+	DEG_scene_relations_rebuild(bmain, scene);
 }
 
 /* update scene for current frame */
@@ -373,7 +375,7 @@ static void motionpaths_calc_bake_targets(Scene *scene, ListBase *targets)
  *	- recalc: whether we need to
  */
 /* TODO: include reports pointer? */
-void animviz_calc_motionpaths(Scene *scene, ListBase *targets)
+void animviz_calc_motionpaths(bContext *C, Scene *scene, ListBase *targets)
 {
 	MPathTarget *mpt;
 	int sfra, efra;
@@ -399,7 +401,7 @@ void animviz_calc_motionpaths(Scene *scene, ListBase *targets)
 	
 	/* optimize the depsgraph for faster updates */
 	/* TODO: whether this is used should depend on some setting for the level of optimizations used */
-	motionpaths_calc_optimise_depsgraph(scene, targets);
+	motionpaths_calc_optimise_depsgraph(C, scene, targets);
 	
 	/* calculate path over requested range */
 	for (CFRA = sfra; CFRA <= efra; CFRA++) {
diff --git a/source/blender/blenkernel/intern/anim_sys.c b/source/blender/blenkernel/intern/anim_sys.c
index 6475e5c8acd..5b7947df9dd 100644
--- a/source/blender/blenkernel/intern/anim_sys.c
+++ b/source/blender/blenkernel/intern/anim_sys.c
@@ -261,7 +261,7 @@ void BKE_animdata_free(ID *id, const bool do_id_user)
 /* Copying -------------------------------------------- */
 
 /* Make a copy of the given AnimData - to be used when copying datablocks */
-AnimData *BKE_animdata_copy(AnimData *adt, const bool do_action)
+AnimData *BKE_animdata_copy(Main *bmain, AnimData *adt, const bool do_action)
 {
 	AnimData *dadt;
 	
@@ -272,8 +272,9 @@ AnimData *BKE_animdata_copy(AnimData *adt, const bool do_action)
 	
 	/* make a copy of action - at worst, user has to delete copies... */
 	if (do_action) {
-		dadt->action = BKE_action_copy(G.main, adt->action);
-		dadt->tmpact = BKE_action_copy(G.main, adt->tmpact);
+		BLI_assert(bmain != NULL);
+		BKE_id_copy_ex(bmain, (ID *)dadt->action, (ID **)&dadt->action, 0, false);
+		BKE_id_copy_ex(bmain, (ID *)dadt->tmpact, (ID **)&dadt->tmpact, 0, false);
 	}
 	else {
 		id_us_plus((ID *)dadt->action);
@@ -293,7 +294,7 @@ AnimData *BKE_animdata_copy(AnimData *adt, const bool do_action)
 	return dadt;
 }
 
-bool BKE_animdata_copy_id(ID *id_to, ID *id_from, const bool do_action)
+bool BKE_animdata_copy_id(Main *bmain, ID *id_to, ID *id_from, const bool do_action)
 {
 	AnimData *adt;
 
@@ -305,7 +306,7 @@ bool BKE_animdata_copy_id(ID *id_to, ID *id_from, const bool do_action)
 	adt = BKE_animdata_from_id(id_from);
 	if (adt) {
 		IdAdtTemplate *iat = (IdAdtTemplate *)id_to;
-		iat->adt = BKE_animdata_copy(adt, do_action);
+		iat->adt = BKE_animdata_copy(bmain, adt, do_action);
 	}
 
 	return true;
@@ -625,6 +626,8 @@ char *BKE_animdata_driver_path_hack(bContext *C, PointerRNA *ptr, PropertyRNA *p
 					}
 					break;
 				}
+				default:
+					break;
 			}
 
 			/* fix RNA pointer, as we've now changed the ID root by changing the paths */
@@ -1349,7 +1352,7 @@ void BKE_keyingset_free_path(KeyingSet *ks, KS_Path *ksp)
 }
 
 /* Copy all KeyingSets in the given list */
-void BKE_keyingsets_copy(ListBase *newlist, ListBase *list)
+void BKE_keyingsets_copy(ListBase *newlist, const ListBase *list)
 {
 	KeyingSet *ksn;
 	KS_Path *kspn;
@@ -1521,7 +1524,8 @@ static bool animsys_write_rna_setting(PathResolvedRNA *anim_rna, const float val
 		}
 		case PROP_INT:
 		{
-			const int value_coerce = (int)value;
+			int value_coerce = (int)value;
+			RNA_property_int_clamp(ptr, prop, &value_coerce);
 			if (array_index != -1) {
 				if (RNA_property_int_get_index(ptr, prop, array_index) != value_coerce) {
 					RNA_property_int_set_index(ptr, prop, array_index, value_coerce);
@@ -1538,15 +1542,17 @@ static bool animsys_write_rna_setting(PathResolvedRNA *anim_rna, const float val
 		}
 		case PROP_FLOAT:
 		{
+			float value_coerce = value;
+			RNA_property_float_clamp(ptr, prop, &value_coerce);
 			if (array_index != -1) {
-				if (RNA_property_float_get_index(ptr, prop, array_index) != value) {
-					RNA_property_float_set_index(ptr, prop, array_index, value);
+				if (RNA_property_float_get_index(ptr, prop, array_index) != value_coerce) {
+					RNA_property_float_set_index(ptr, prop, array_index, value_coerce);
 					written = true;
 				}
 			}
 			else {
-				if (RNA_property_float_get(ptr, prop) != value) {
-					RNA_property_float_set(ptr, prop, value);
+				if (RNA_property_float_get(ptr, prop) != value_coerce) {
+					RNA_property_float_set(ptr, prop, value_coerce);
 					written = true;
 				}
 			}
@@ -2846,7 +2852,7 @@ void BKE_animsys_evaluate_all_animation(Main *main, Scene *scene, float ctime)
 
 #define DEBUG_PRINT if (G.debug & G_DEBUG_DEPSGRAPH) printf
 
-void BKE_animsys_eval_animdata(EvaluationContext *eval_ctx, ID *id)
+void BKE_animsys_eval_animdata(const EvaluationContext *eval_ctx, ID *id)
 {
 	AnimData *adt = BKE_animdata_from_id(id);
 	Scene *scene = NULL; /* XXX: this is only needed for flushing RNA updates,
@@ -2856,7 +2862,7 @@ void BKE_animsys_eval_animdata(EvaluationContext *eval_ctx, ID *id)
 	BKE_animsys_evaluate_animdata(scene, id, adt, eval_ctx->ctime, ADT_RECALC_ANIM);
 }
 
-void BKE_animsys_eval_driver(EvaluationContext *eval_ctx,
+void BKE_animsys_eval_driver(const EvaluationContext *eval_ctx,
                              ID *id,
                              FCurve *fcu)
 {
diff --git a/source/blender/blenkernel/intern/appdir.c b/source/blender/blenkernel/intern/appdir.c
index 43fd47981b1..6dd852c7875 100644
--- a/source/blender/blenkernel/intern/appdir.c
+++ b/source/blender/blenkernel/intern/appdir.c
@@ -106,7 +106,8 @@ const char *BKE_appdir_folder_default(void)
 static char *blender_version_decimal(const int ver)
 {
 	static char version_str[5];
-	sprintf(version_str, "%d.%02d", ver / 100, ver % 100);
+	BLI_assert(ver < 1000);
+	BLI_snprintf(version_str, sizeof(version_str), "%d.%02d", ver / 100, ver % 100);
 	return version_str;
 }
 
@@ -212,8 +213,10 @@ static bool get_path_local(
 	/* try EXECUTABLE_DIR/2.5x/folder_name - new default directory for local blender installed files */
 #ifdef __APPLE__
 	/* due new codesign situation in OSX > 10.9.5 we must move the blender_version dir with contents to Resources */
-	static char osx_resourses[FILE_MAX];
-	sprintf(osx_resourses, "%s../Resources", bprogdir);
+	char osx_resourses[FILE_MAX];
+	BLI_snprintf(osx_resourses, sizeof(osx_resourses), "%s../Resources", bprogdir);
+	/* Remove the '/../' added above. */
+	BLI_cleanup_path(NULL, osx_resourses);
 	return test_path(targetpath, targetpath_len, osx_resourses, blender_version_decimal(ver), relfolder);
 #else
 	return test_path(targetpath, targetpath_len, bprogdir, blender_version_decimal(ver), relfolder);
@@ -326,10 +329,12 @@ static bool get_path_system(
 			return true;
 		}
 	}
-
 	/* try EXECUTABLE_DIR/release/folder_name */
-	if (test_path(targetpath, targetpath_len, bprogdir, "release", relfolder))
+	if (test_path(targetpath, targetpath_len, bprogdir, "release", relfolder)) {
 		return true;
+	}
+	/* never use if not existing. */
+	targetpath[0] = '\0';
 
 	/* end developer overrides */
 
@@ -591,6 +596,9 @@ static void where_am_i(char *fullname, const size_t maxlen, const char *name)
 		else {
 			BLI_path_program_search(fullname, maxlen, name);
 		}
+		/* Remove "/./" and "/../" so string comparisons can be used on the path. */
+		BLI_cleanup_path(NULL, fullname);
+
 #if defined(DEBUG)
 		if (!STREQ(name, fullname)) {
 			printf("guessing '%s' == '%s'\n", name, fullname);
@@ -683,13 +691,16 @@ bool BKE_appdir_program_python_search(
 	return is_found;
 }
 
+/** Keep in sync with `bpy.utils.app_template_paths()` */
 static const char *app_template_directory_search[2] = {
 	"startup" SEP_STR "bl_app_templates_user",
 	"startup" SEP_STR "bl_app_templates_system",
 };
 
 static const int app_template_directory_id[2] = {
+	/* Only 'USER' */
 	BLENDER_USER_SCRIPTS,
+	/* Covers 'LOCAL' & 'SYSTEM'. */
 	BLENDER_SYSTEM_SCRIPTS,
 };
 
diff --git a/source/blender/blenkernel/intern/armature.c b/source/blender/blenkernel/intern/armature.c
index 38b98f1eee6..7dfc4df114c 100644
--- a/source/blender/blenkernel/intern/armature.c
+++ b/source/blender/blenkernel/intern/armature.c
@@ -82,7 +82,7 @@ bArmature *BKE_armature_add(Main *bmain, const char *name)
 {
 	bArmature *arm;
 
-	arm = BKE_libblock_alloc(bmain, ID_AR, name);
+	arm = BKE_libblock_alloc(bmain, ID_AR, name, 0);
 	arm->deformflag = ARM_DEF_VGROUP | ARM_DEF_ENVELOPE;
 	arm->flag = ARM_COL_CUSTOM; /* custom bone-group colors */
 	arm->layer = 1;
@@ -149,54 +149,70 @@ void BKE_armature_make_local(Main *bmain, bArmature *arm, const bool lib_local)
 	BKE_id_make_local_generic(bmain, &arm->id, true, lib_local);
 }
 
-static void copy_bonechildren(Bone *newBone, const Bone *oldBone, const Bone *actBone, Bone **newActBone)
+static void copy_bonechildren(
+        Bone *bone_dst, const Bone *bone_src, const Bone *bone_src_act, Bone **r_bone_dst_act, const int flag)
 {
-	Bone *curBone, *newChildBone;
+	Bone *bone_src_child, *bone_dst_child;
 
-	if (oldBone == actBone)
-		*newActBone = newBone;
+	if (bone_src == bone_src_act) {
+		*r_bone_dst_act = bone_dst;
+	}
 
-	if (oldBone->prop)
-		newBone->prop = IDP_CopyProperty(oldBone->prop);
+	if (bone_src->prop) {
+		bone_dst->prop = IDP_CopyProperty_ex(bone_src->prop, flag);
+	}
 
 	/* Copy this bone's list */
-	BLI_duplicatelist(&newBone->childbase, &oldBone->childbase);
+	BLI_duplicatelist(&bone_dst->childbase, &bone_src->childbase);
 
 	/* For each child in the list, update it's children */
-	newChildBone = newBone->childbase.first;
-	for (curBone = oldBone->childbase.first; curBone; curBone = curBone->next) {
-		newChildBone->parent = newBone;
-		copy_bonechildren(newChildBone, curBone, actBone, newActBone);
-		newChildBone = newChildBone->next;
+	for (bone_src_child = bone_src->childbase.first, bone_dst_child = bone_dst->childbase.first;
+	     bone_src_child;
+	     bone_src_child = bone_src_child->next, bone_dst_child = bone_dst_child->next)
+	{
+		bone_dst_child->parent = bone_dst;
+		copy_bonechildren(bone_dst_child, bone_src_child, bone_src_act, r_bone_dst_act, flag);
 	}
 }
 
-bArmature *BKE_armature_copy(Main *bmain, const bArmature *arm)
+/**
+ * Only copy internal data of Armature ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_armature_copy_data(Main *UNUSED(bmain), bArmature *arm_dst, const bArmature *arm_src, const int flag)
 {
-	bArmature *newArm;
-	Bone *oldBone, *newBone;
-	Bone *newActBone = NULL;
+	Bone *bone_src, *bone_dst;
+	Bone *bone_dst_act = NULL;
+
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
 
-	newArm = BKE_libblock_copy(bmain, &arm->id);
-	BLI_duplicatelist(&newArm->bonebase, &arm->bonebase);
+	BLI_duplicatelist(&arm_dst->bonebase, &arm_src->bonebase);
 
 	/* Duplicate the childrens' lists */
-	newBone = newArm->bonebase.first;
-	for (oldBone = arm->bonebase.first; oldBone; oldBone = oldBone->next) {
-		newBone->parent = NULL;
-		copy_bonechildren(newBone, oldBone, arm->act_bone, &newActBone);
-		newBone = newBone->next;
+	bone_dst = arm_dst->bonebase.first;
+	for (bone_src = arm_src->bonebase.first; bone_src; bone_src = bone_src->next) {
+		bone_dst->parent = NULL;
+		copy_bonechildren(bone_dst, bone_src, arm_src->act_bone, &bone_dst_act, flag_subdata);
+		bone_dst = bone_dst->next;
 	}
 
-	newArm->act_bone = newActBone;
-
-	newArm->edbo = NULL;
-	newArm->act_edbone = NULL;
-	newArm->sketch = NULL;
+	arm_dst->act_bone = bone_dst_act;
 
-	BKE_id_copy_ensure_local(bmain, &arm->id, &newArm->id);
+	arm_dst->edbo = NULL;
+	arm_dst->act_edbone = NULL;
+	arm_dst->sketch = NULL;
+}
 
-	return newArm;
+bArmature *BKE_armature_copy(Main *bmain, const bArmature *arm)
+{
+	bArmature *arm_copy;
+	BKE_id_copy_ex(bmain, &arm->id, (ID **)&arm_copy, 0, false);
+	return arm_copy;
 }
 
 static Bone *get_named_bone_bonechildren(ListBase *lb, const char *name)
@@ -1445,13 +1461,13 @@ void BKE_armature_loc_pose_to_bone(bPoseChannel *pchan, const float inloc[3], fl
 	copy_v3_v3(outloc, nLocMat[3]);
 }
 
-void BKE_armature_mat_pose_to_bone_ex(Object *ob, bPoseChannel *pchan, float inmat[4][4], float outmat[4][4])
+void BKE_armature_mat_pose_to_bone_ex(const struct EvaluationContext *eval_ctx, Object *ob, bPoseChannel *pchan, float inmat[4][4], float outmat[4][4])
 {
 	bPoseChannel work_pchan = *pchan;
 
 	/* recalculate pose matrix with only parent transformations,
 	 * bone loc/sca/rot is ignored, scene and frame are not used. */
-	BKE_pose_where_is_bone(NULL, ob, &work_pchan, 0.0f, false);
+	BKE_pose_where_is_bone(eval_ctx, NULL, ob, &work_pchan, 0.0f, false);
 
 	/* find the matrix, need to remove the bone transforms first so this is
 	 * calculated as a matrix to set rather then a difference ontop of whats
@@ -2178,7 +2194,9 @@ void BKE_pose_where_is_bone_tail(bPoseChannel *pchan)
 /* pchan is validated, as having bone and parent pointer
  * 'do_extra': when zero skips loc/size/rot, constraints and strip modifiers.
  */
-void BKE_pose_where_is_bone(Scene *scene, Object *ob, bPoseChannel *pchan, float ctime, bool do_extra)
+void BKE_pose_where_is_bone(
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, bPoseChannel *pchan, float ctime, bool do_extra)
 {
 	/* This gives a chan_mat with actions (ipos) results. */
 	if (do_extra)
@@ -2217,7 +2235,7 @@ void BKE_pose_where_is_bone(Scene *scene, Object *ob, bPoseChannel *pchan, float
 			cob = BKE_constraints_make_evalob(scene, ob, pchan, CONSTRAINT_OBTYPE_BONE);
 
 			/* Solve PoseChannel's Constraints */
-			BKE_constraints_solve(&pchan->constraints, cob, ctime); /* ctime doesnt alter objects */
+			BKE_constraints_solve(eval_ctx, &pchan->constraints, cob, ctime); /* ctime doesnt alter objects */
 
 			/* cleanup after Constraint Solving
 			 * - applies matrix back to pchan, and frees temporary struct used
@@ -2239,7 +2257,7 @@ void BKE_pose_where_is_bone(Scene *scene, Object *ob, bPoseChannel *pchan, float
 
 /* This only reads anim data from channels, and writes to channels */
 /* This is the only function adding poses */
-void BKE_pose_where_is(Scene *scene, Object *ob)
+void BKE_pose_where_is(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
 	bArmature *arm;
 	Bone *bone;
@@ -2278,7 +2296,7 @@ void BKE_pose_where_is(Scene *scene, Object *ob)
 		}
 
 		/* 2a. construct the IK tree (standard IK) */
-		BIK_initialize_tree(scene, ob, ctime);
+		BIK_initialize_tree(eval_ctx, scene, ob, ctime);
 
 		/* 2b. construct the Spline IK trees
 		 *  - this is not integrated as an IK plugin, since it should be able
@@ -2290,15 +2308,15 @@ void BKE_pose_where_is(Scene *scene, Object *ob)
 		for (pchan = ob->pose->chanbase.first; pchan; pchan = pchan->next) {
 			/* 4a. if we find an IK root, we handle it separated */
 			if (pchan->flag & POSE_IKTREE) {
-				BIK_execute_tree(scene, ob, pchan, ctime);
+				BIK_execute_tree(eval_ctx, scene, ob, pchan, ctime);
 			}
 			/* 4b. if we find a Spline IK root, we handle it separated too */
 			else if (pchan->flag & POSE_IKSPLINE) {
-				BKE_splineik_execute_tree(scene, ob, pchan, ctime);
+				BKE_splineik_execute_tree(eval_ctx, scene, ob, pchan, ctime);
 			}
 			/* 5. otherwise just call the normal solver */
 			else if (!(pchan->flag & POSE_DONE)) {
-				BKE_pose_where_is_bone(scene, ob, pchan, ctime, 1);
+				BKE_pose_where_is_bone(eval_ctx, scene, ob, pchan, ctime, 1);
 			}
 		}
 		/* 6. release the IK tree */
diff --git a/source/blender/blenkernel/intern/armature_update.c b/source/blender/blenkernel/intern/armature_update.c
index 73e9f5d0774..1addbcbadc0 100644
--- a/source/blender/blenkernel/intern/armature_update.c
+++ b/source/blender/blenkernel/intern/armature_update.c
@@ -113,9 +113,11 @@ static void splineik_init_tree_from_pchan(Scene *scene, Object *UNUSED(ob), bPos
 		 *       currently for paths to work it needs to go through the bevlist/displist system (ton)
 		 */
 
+		/* TODO: Make sure this doesn't crash. */
+#if 0
 		/* only happens on reload file, but violates depsgraph still... fix! */
 		if (ELEM(NULL,  ikData->tar->curve_cache, ikData->tar->curve_cache->path, ikData->tar->curve_cache->path->data)) {
-			BKE_displist_make_curveTypes(scene, ikData->tar, 0);
+			BKE_displist_make_curveTypes(eval_ctx, scene, ikData->tar, 0);
 			
 			/* path building may fail in EditMode after removing verts [#33268]*/
 			if (ELEM(NULL, ikData->tar->curve_cache->path, ikData->tar->curve_cache->path->data)) {
@@ -123,6 +125,9 @@ static void splineik_init_tree_from_pchan(Scene *scene, Object *UNUSED(ob), bPos
 				return;
 			}
 		}
+#else
+		(void) scene;
+#endif
 	}
 
 	/* find the root bone and the chain of bones from the root to the tip
@@ -261,15 +266,16 @@ static void splineik_init_tree(Scene *scene, Object *ob, float UNUSED(ctime))
 /* ----------- */
 
 /* Evaluate spline IK for a given bone */
-static void splineik_evaluate_bone(tSplineIK_Tree *tree, Scene *scene, Object *ob, bPoseChannel *pchan,
-                                   int index, float ctime)
+static void splineik_evaluate_bone(
+        const struct EvaluationContext *eval_ctx, tSplineIK_Tree *tree, Scene *scene, Object *ob, bPoseChannel *pchan,
+        int index, float ctime)
 {
 	bSplineIKConstraint *ikData = tree->ikData;
 	float poseHead[3], poseTail[3], poseMat[4][4];
 	float splineVec[3], scaleFac, radius = 1.0f;
 
 	/* firstly, calculate the bone matrix the standard way, since this is needed for roll control */
-	BKE_pose_where_is_bone(scene, ob, pchan, ctime, 1);
+	BKE_pose_where_is_bone(eval_ctx, scene, ob, pchan, ctime, 1);
 
 	copy_v3_v3(poseHead, pchan->pose_head);
 	copy_v3_v3(poseTail, pchan->pose_tail);
@@ -511,7 +517,7 @@ static void splineik_evaluate_bone(tSplineIK_Tree *tree, Scene *scene, Object *o
 }
 
 /* Evaluate the chain starting from the nominated bone */
-static void splineik_execute_tree(Scene *scene, Object *ob, bPoseChannel *pchan_root, float ctime)
+static void splineik_execute_tree(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, bPoseChannel *pchan_root, float ctime)
 {
 	tSplineIK_Tree *tree;
 
@@ -525,7 +531,7 @@ static void splineik_execute_tree(Scene *scene, Object *ob, bPoseChannel *pchan_
 		 */
 		for (i = tree->chainlen - 1; i >= 0; i--) {
 			bPoseChannel *pchan = tree->chain[i];
-			splineik_evaluate_bone(tree, scene, ob, pchan, i, ctime);
+			splineik_evaluate_bone(eval_ctx, tree, scene, ob, pchan, i, ctime);
 		}
 
 		/* free the tree info specific to SplineIK trees now */
@@ -544,19 +550,20 @@ void BKE_pose_splineik_init_tree(Scene *scene, Object *ob, float ctime)
 	splineik_init_tree(scene, ob, ctime);
 }
 
-void BKE_splineik_execute_tree(Scene *scene, Object *ob, bPoseChannel *pchan_root, float ctime)
+void BKE_splineik_execute_tree(
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, bPoseChannel *pchan_root, float ctime)
 {
-	splineik_execute_tree(scene, ob, pchan_root, ctime);
+	splineik_execute_tree(eval_ctx, scene, ob, pchan_root, ctime);
 }
 
 /* *************** Depsgraph evaluation callbacks ************ */
 
-void BKE_pose_eval_init(struct EvaluationContext *UNUSED(eval_ctx),
-                        Scene *scene,
+void BKE_pose_eval_init(const struct EvaluationContext *UNUSED(eval_ctx),
+                        Scene *UNUSED(scene),
                         Object *ob,
                         bPose *pose)
 {
-	float ctime = BKE_scene_frame_get(scene); /* not accurate... */
 	bPoseChannel *pchan;
 
 	DEBUG_PRINT("%s on %s\n", __func__, ob->id.name);
@@ -574,9 +581,19 @@ void BKE_pose_eval_init(struct EvaluationContext *UNUSED(eval_ctx),
 	for (pchan = pose->chanbase.first; pchan != NULL; pchan = pchan->next) {
 		pchan->flag &= ~(POSE_DONE | POSE_CHAIN | POSE_IKTREE | POSE_IKSPLINE);
 	}
+}
+
+void BKE_pose_eval_init_ik(const struct EvaluationContext *eval_ctx,
+                           Scene *scene,
+                           Object *ob,
+                           bPose *UNUSED(pose))
+{
+	float ctime = BKE_scene_frame_get(scene); /* not accurate... */
+
+	DEBUG_PRINT("%s on %s\n", __func__, ob->id.name);
 
 	/* 2a. construct the IK tree (standard IK) */
-	BIK_initialize_tree(scene, ob, ctime);
+	BIK_initialize_tree(eval_ctx, scene, ob, ctime);
 
 	/* 2b. construct the Spline IK trees
 	 *  - this is not integrated as an IK plugin, since it should be able
@@ -585,7 +602,7 @@ void BKE_pose_eval_init(struct EvaluationContext *UNUSED(eval_ctx),
 	BKE_pose_splineik_init_tree(scene, ob, ctime);
 }
 
-void BKE_pose_eval_bone(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_pose_eval_bone(const struct EvaluationContext *eval_ctx,
                         Scene *scene,
                         Object *ob,
                         bPoseChannel *pchan)
@@ -613,14 +630,14 @@ void BKE_pose_eval_bone(struct EvaluationContext *UNUSED(eval_ctx),
 				if ((pchan->flag & POSE_DONE) == 0) {
 					/* TODO(sergey): Use time source node for time. */
 					float ctime = BKE_scene_frame_get(scene); /* not accurate... */
-					BKE_pose_where_is_bone(scene, ob, pchan, ctime, 1);
+					BKE_pose_where_is_bone(eval_ctx, scene, ob, pchan, ctime, 1);
 				}
 			}
 		}
 	}
 }
 
-void BKE_pose_constraints_evaluate(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_pose_constraints_evaluate(const struct EvaluationContext *eval_ctx,
                                    Scene *scene,
                                    Object *ob,
                                    bPoseChannel *pchan)
@@ -636,12 +653,12 @@ void BKE_pose_constraints_evaluate(struct EvaluationContext *UNUSED(eval_ctx),
 	else {
 		if ((pchan->flag & POSE_DONE) == 0) {
 			float ctime = BKE_scene_frame_get(scene); /* not accurate... */
-			BKE_pose_where_is_bone(scene, ob, pchan, ctime, 1);
+			BKE_pose_where_is_bone(eval_ctx, scene, ob, pchan, ctime, 1);
 		}
 	}
 }
 
-void BKE_pose_bone_done(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_pose_bone_done(const struct EvaluationContext *UNUSED(eval_ctx),
                         bPoseChannel *pchan)
 {
 	float imat[4][4];
@@ -652,27 +669,27 @@ void BKE_pose_bone_done(struct EvaluationContext *UNUSED(eval_ctx),
 	}
 }
 
-void BKE_pose_iktree_evaluate(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_pose_iktree_evaluate(const struct EvaluationContext *eval_ctx,
                               Scene *scene,
                               Object *ob,
                               bPoseChannel *rootchan)
 {
 	float ctime = BKE_scene_frame_get(scene); /* not accurate... */
 	DEBUG_PRINT("%s on %s pchan %s\n", __func__, ob->id.name, rootchan->name);
-	BIK_execute_tree(scene, ob, rootchan, ctime);
+	BIK_execute_tree(eval_ctx, scene, ob, rootchan, ctime);
 }
 
-void BKE_pose_splineik_evaluate(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_pose_splineik_evaluate(const struct EvaluationContext *eval_ctx,
                                 Scene *scene,
                                 Object *ob,
                                 bPoseChannel *rootchan)
 {
 	float ctime = BKE_scene_frame_get(scene); /* not accurate... */
 	DEBUG_PRINT("%s on %s pchan %s\n", __func__, ob->id.name, rootchan->name);
-	BKE_splineik_execute_tree(scene, ob, rootchan, ctime);
+	BKE_splineik_execute_tree(eval_ctx, scene, ob, rootchan, ctime);
 }
 
-void BKE_pose_eval_flush(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_pose_eval_flush(const struct EvaluationContext *UNUSED(eval_ctx),
                          Scene *scene,
                          Object *ob,
                          bPose *UNUSED(pose))
@@ -687,7 +704,7 @@ void BKE_pose_eval_flush(struct EvaluationContext *UNUSED(eval_ctx),
 	ob->recalc &= ~OB_RECALC_ALL;
 }
 
-void BKE_pose_eval_proxy_copy(struct EvaluationContext *UNUSED(eval_ctx), Object *ob)
+void BKE_pose_eval_proxy_copy(const struct EvaluationContext *UNUSED(eval_ctx), Object *ob)
 {
 	BLI_assert(ID_IS_LINKED_DATABLOCK(ob) && ob->proxy_from != NULL);
 	DEBUG_PRINT("%s on %s\n", __func__, ob->id.name);
diff --git a/source/blender/blenkernel/intern/blender.c b/source/blender/blenkernel/intern/blender.c
index ebb10c02683..1f75c85291d 100644
--- a/source/blender/blenkernel/intern/blender.c
+++ b/source/blender/blenkernel/intern/blender.c
@@ -230,19 +230,6 @@ void BKE_blender_userdef_free_data(UserDef *userdef)
 }
 
 /**
- * Handle changes in settings that need refreshing.
- */
-void BKE_blender_userdef_refresh(void)
-{
-	/* prevent accidents */
-	if (U.pixelsize == 0) U.pixelsize = 1;
-	
-	BLF_default_dpi(U.pixelsize * U.dpi);
-	U.widget_unit = (U.pixelsize * U.dpi * 20 + 36) / 72;
-
-}
-
-/**
  * Write U from userdef.
  * This function defines which settings a template will override for the user preferences.
  */
diff --git a/source/blender/blenkernel/intern/blender_copybuffer.c b/source/blender/blenkernel/intern/blender_copybuffer.c
index 206b0f2a8cc..2d37f3ab0cb 100644
--- a/source/blender/blenkernel/intern/blender_copybuffer.c
+++ b/source/blender/blenkernel/intern/blender_copybuffer.c
@@ -49,6 +49,7 @@
 #include "BKE_main.h"
 #include "BKE_scene.h"
 
+#include "DEG_depsgraph.h"
 #include "DEG_depsgraph_build.h"
 
 #include "BLO_readfile.h"
@@ -160,6 +161,10 @@ bool BKE_copybuffer_paste(bContext *C, const char *libname, const short flag, Re
 	/* recreate dependency graph to include new objects */
 	DEG_relations_tag_update(bmain);
 
+	/* Tag update the scene to flush base collection settings, since the new object is added to a
+	 * new (active) collection, not its original collection, thus need recalculation. */
+	DEG_id_tag_update(&scene->id, 0);
+
 	BLO_blendhandle_close(bh);
 	/* remove library... */
 
diff --git a/source/blender/blenkernel/intern/blendfile.c b/source/blender/blenkernel/intern/blendfile.c
index 53f2462ee98..e1350aa8a46 100644
--- a/source/blender/blenkernel/intern/blendfile.c
+++ b/source/blender/blenkernel/intern/blendfile.c
@@ -117,6 +117,7 @@ static void setup_app_data(
         const char *filepath, ReportList *reports)
 {
 	Scene *curscene = NULL;
+	const bool is_startup = (bfd->filename[0] == '\0');
 	const bool recover = (G.fileflags & G_FILE_RECOVER) != 0;
 	enum {
 		LOAD_UI = 1,
@@ -132,7 +133,7 @@ static void setup_app_data(
 	else if (BLI_listbase_is_empty(&bfd->main->screen)) {
 		mode = LOAD_UNDO;
 	}
-	else if (G.fileflags & G_FILE_NO_UI) {
+	else if ((G.fileflags & G_FILE_NO_UI) && (is_startup == false)) {
 		mode = LOAD_UI_OFF;
 	}
 	else {
@@ -193,7 +194,7 @@ static void setup_app_data(
 		}
 		if (cur_render_layer == NULL) {
 			/* fallback to scene layer */
-			cur_render_layer = BKE_scene_layer_render_active(curscene);
+			cur_render_layer = BKE_scene_layer_from_scene_get(curscene);
 		}
 
 		if (track_undo_scene) {
@@ -218,6 +219,13 @@ static void setup_app_data(
 				BKE_screen_view3d_scene_sync(curscreen, curscene);
 			}
 		}
+
+		/* We need to tag this here because events may be handled immediately after.
+		 * only the current screen is important because we wont have to handle
+		 * events from multiple screens at once.*/
+		{
+			BKE_screen_manipulator_tag_refresh(curscreen);
+		}
 	}
 
 	/* free G.main Main database */
@@ -257,7 +265,9 @@ static void setup_app_data(
 		CTX_data_scene_set(C, curscene);
 	}
 	else {
-		G.fileflags = bfd->fileflags;
+		/* Keep state from preferences. */
+		const int fileflags_skip = G_FILE_FLAGS_RUNTIME;
+		G.fileflags = (G.fileflags & fileflags_skip) | (bfd->fileflags & ~fileflags_skip);
 		CTX_wm_manager_set(C, G.main->wm.first);
 		CTX_wm_screen_set(C, bfd->curscreen);
 		CTX_data_scene_set(C, bfd->curscene);
@@ -333,20 +343,19 @@ static void setup_app_data(
 		}
 	}
 
-	if (mode == LOAD_UI_OFF && BLI_listbase_is_empty(&G.main->wm)) {
-		/* XXX prevent crash in pdInitEffectors called through DEG_scene_relations_rebuild (see T51794).
-		 * Can be removed once BKE_scene_layer_context_active_ex gets workspace passed. */
-		BLI_addhead(&G.main->wm, CTX_wm_manager(C));
-		BKE_scene_set_background(G.main, curscene);
-		BLI_listbase_clear(&G.main->wm);
-	}
-	else {
-		BKE_scene_set_background(G.main, curscene);
+	/* Setting scene might require having a dependency graph, with copy on write
+	 * we need to make sure we ensure scene has correct color management before
+	 * constructing dependency graph.
+	 */
+	if (mode != LOAD_UNDO) {
+		IMB_colormanagement_check_file_config(G.main);
 	}
 
+	BKE_scene_set_background(G.main, curscene);
+
 	if (mode != LOAD_UNDO) {
+		/* TODO(sergey): Can this be also move above? */
 		RE_FreeAllPersistentData();
-		IMB_colormanagement_check_file_config(G.main);
 	}
 
 	MEM_freeN(bfd);
diff --git a/source/blender/blenkernel/intern/boids.c b/source/blender/blenkernel/intern/boids.c
index 7ca4e07076d..8c78787c259 100644
--- a/source/blender/blenkernel/intern/boids.c
+++ b/source/blender/blenkernel/intern/boids.c
@@ -132,6 +132,7 @@ static int rule_goal_avoid(BoidRule *rule, BoidBrainData *bbd, BoidValues *val,
 	if (eff == NULL && gabr->ob) {
 		memset(&temp_eff, 0, sizeof(EffectorCache));
 		temp_eff.ob = gabr->ob;
+		temp_eff.eval_ctx = bbd->sim->eval_ctx;
 		temp_eff.scene = bbd->sim->scene;
 		eff = &temp_eff;
 		get_effector_data(eff, &efd, &epoint, 0);
diff --git a/source/blender/blenkernel/intern/brush.c b/source/blender/blenkernel/intern/brush.c
index aae323a5056..aeaead578a1 100644
--- a/source/blender/blenkernel/intern/brush.c
+++ b/source/blender/blenkernel/intern/brush.c
@@ -152,7 +152,7 @@ Brush *BKE_brush_add(Main *bmain, const char *name, short ob_mode)
 {
 	Brush *brush;
 
-	brush = BKE_libblock_alloc(bmain, ID_BR, name);
+	brush = BKE_libblock_alloc(bmain, ID_BR, name, 0);
 
 	BKE_brush_init(brush);
 
@@ -172,34 +172,38 @@ struct Brush *BKE_brush_first_search(struct Main *bmain, short ob_mode)
 	return NULL;
 }
 
-Brush *BKE_brush_copy(Main *bmain, const Brush *brush)
+/**
+ * Only copy internal data of Brush ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_brush_copy_data(Main *UNUSED(bmain), Brush *brush_dst, const Brush *brush_src, const int flag)
 {
-	Brush *brushn;
-	
-	brushn = BKE_libblock_copy(bmain, &brush->id);
-
-	if (brush->mtex.tex)
-		id_us_plus((ID *)brush->mtex.tex);
-
-	if (brush->mask_mtex.tex)
-		id_us_plus((ID *)brush->mask_mtex.tex);
-
-	if (brush->paint_curve)
-		id_us_plus((ID *)brush->paint_curve);
-
-	if (brush->icon_imbuf)
-		brushn->icon_imbuf = IMB_dupImBuf(brush->icon_imbuf);
+	if (brush_src->icon_imbuf) {
+		brush_dst->icon_imbuf = IMB_dupImBuf(brush_src->icon_imbuf);
+	}
 
-	brushn->preview = NULL;
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
+		BKE_previewimg_id_copy(&brush_dst->id, &brush_src->id);
+	}
+	else {
+		brush_dst->preview = NULL;
+	}
 
-	brushn->curve = curvemapping_copy(brush->curve);
+	brush_dst->curve = curvemapping_copy(brush_src->curve);
 
 	/* enable fake user by default */
-	id_fake_user_set(&brushn->id);
-
-	BKE_id_copy_ensure_local(bmain, &brush->id, &brushn->id);
+	id_fake_user_set(&brush_dst->id);
+}
 
-	return brushn;
+Brush *BKE_brush_copy(Main *bmain, const Brush *brush)
+{
+	Brush *brush_copy;
+	BKE_id_copy_ex(bmain, &brush->id, (ID **)&brush_copy, 0, false);
+	return brush_copy;
 }
 
 /** Free (or release) any data used by this brush (does not free the brush itself). */
@@ -517,13 +521,13 @@ int BKE_brush_clone_image_delete(Brush *brush)
  * region space mouse coordinates, or 3d world coordinates for 3D mapping.
  *
  * rgba outputs straight alpha. */
-float BKE_brush_sample_tex_3D(const Scene *scene, Brush *br,
+float BKE_brush_sample_tex_3D(const Scene *scene, const Brush *br,
                               const float point[3],
                               float rgba[4], const int thread,
                               struct ImagePool *pool)
 {
 	UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
-	MTex *mtex = &br->mtex;
+	const MTex *mtex = &br->mtex;
 	float intensity = 1.0;
 	bool hasrgb = false;
 
@@ -817,7 +821,7 @@ int BKE_brush_size_get(const Scene *scene, const Brush *brush)
 	return size;
 }
 
-int BKE_brush_use_locked_size(const Scene *scene, const Brush *brush)
+bool BKE_brush_use_locked_size(const Scene *scene, const Brush *brush)
 {
 	const short us_flag = scene->toolsettings->unified_paint_settings.flag;
 
@@ -826,7 +830,7 @@ int BKE_brush_use_locked_size(const Scene *scene, const Brush *brush)
 	       (brush->flag & BRUSH_LOCK_SIZE);
 }
 
-int BKE_brush_use_size_pressure(const Scene *scene, const Brush *brush)
+bool BKE_brush_use_size_pressure(const Scene *scene, const Brush *brush)
 {
 	const short us_flag = scene->toolsettings->unified_paint_settings.flag;
 
@@ -835,7 +839,7 @@ int BKE_brush_use_size_pressure(const Scene *scene, const Brush *brush)
 	       (brush->flag & BRUSH_SIZE_PRESSURE);
 }
 
-int BKE_brush_use_alpha_pressure(const Scene *scene, const Brush *brush)
+bool BKE_brush_use_alpha_pressure(const Scene *scene, const Brush *brush)
 {
 	const short us_flag = scene->toolsettings->unified_paint_settings.flag;
 
@@ -844,6 +848,16 @@ int BKE_brush_use_alpha_pressure(const Scene *scene, const Brush *brush)
 	       (brush->flag & BRUSH_ALPHA_PRESSURE);
 }
 
+bool BKE_brush_sculpt_has_secondary_color(const Brush *brush)
+{
+	return ELEM(
+	        brush->sculpt_tool, SCULPT_TOOL_BLOB, SCULPT_TOOL_DRAW,
+	        SCULPT_TOOL_INFLATE, SCULPT_TOOL_CLAY, SCULPT_TOOL_CLAY_STRIPS,
+	        SCULPT_TOOL_PINCH, SCULPT_TOOL_CREASE, SCULPT_TOOL_LAYER,
+	        SCULPT_TOOL_FLATTEN, SCULPT_TOOL_FILL, SCULPT_TOOL_SCRAPE,
+	        SCULPT_TOOL_MASK);
+}
+
 void BKE_brush_unprojected_radius_set(Scene *scene, Brush *brush, float unprojected_radius)
 {
 	UnifiedPaintSettings *ups = &scene->toolsettings->unified_paint_settings;
@@ -962,7 +976,7 @@ void BKE_brush_randomize_texture_coords(UnifiedPaintSettings *ups, bool mask)
 }
 
 /* Uses the brush curve control to find a strength value */
-float BKE_brush_curve_strength(Brush *br, float p, const float len)
+float BKE_brush_curve_strength(const Brush *br, float p, const float len)
 {
 	float strength;
 
diff --git a/source/blender/blenkernel/intern/bvhutils.c b/source/blender/blenkernel/intern/bvhutils.c
index c1fad4f80c8..775499304d4 100644
--- a/source/blender/blenkernel/intern/bvhutils.c
+++ b/source/blender/blenkernel/intern/bvhutils.c
@@ -1137,7 +1137,6 @@ BVHTree *bvhtree_from_mesh_looptri(
 	const MLoopTri *looptri = NULL;
 	bool vert_allocated = false;
 	bool loop_allocated = false;
-	bool looptri_allocated = false;
 
 	BLI_rw_mutex_lock(&cache_rwlock, THREAD_LOCK_READ);
 	tree = bvhcache_find(dm->bvhCache, BVHTREE_FROM_LOOPTRI);
@@ -1150,12 +1149,7 @@ BVHTree *bvhtree_from_mesh_looptri(
 	mpoly = DM_get_poly_array(dm, &poly_allocated);
 
 	mloop = DM_get_loop_array(dm, &loop_allocated);
-	looptri = DM_get_looptri_array(
-	        dm,
-	        mvert,
-	        mpoly, dm->getNumPolys(dm),
-	        mloop, dm->getNumLoops(dm),
-	        &looptri_allocated);
+	looptri = dm->getLoopTriArray(dm);
 
 	if (poly_allocated) {
 		MEM_freeN(mpoly);
@@ -1193,7 +1187,7 @@ BVHTree *bvhtree_from_mesh_looptri(
 		        data, tree, true, epsilon,
 		        mvert, vert_allocated,
 		        mloop, loop_allocated,
-		        looptri, looptri_allocated);
+		        looptri, false);
 	}
 	else {
 		if (vert_allocated) {
@@ -1202,9 +1196,6 @@ BVHTree *bvhtree_from_mesh_looptri(
 		if (loop_allocated) {
 			MEM_freeN(mloop);
 		}
-		if (looptri_allocated) {
-			MEM_freeN((void *)looptri);
-		}
 		memset(data, 0, sizeof(*data));
 	}
 
diff --git a/source/blender/blenkernel/intern/cachefile.c b/source/blender/blenkernel/intern/cachefile.c
index 43dcde302b3..9d02a27187c 100644
--- a/source/blender/blenkernel/intern/cachefile.c
+++ b/source/blender/blenkernel/intern/cachefile.c
@@ -66,7 +66,7 @@ void BKE_cachefiles_exit(void)
 
 void *BKE_cachefile_add(Main *bmain, const char *name)
 {
-	CacheFile *cache_file = BKE_libblock_alloc(bmain, ID_CF, name);
+	CacheFile *cache_file = BKE_libblock_alloc(bmain, ID_CF, name, 0);
 
 	BKE_cachefile_init(cache_file);
 
@@ -100,16 +100,26 @@ void BKE_cachefile_free(CacheFile *cache_file)
 	BLI_freelistN(&cache_file->object_paths);
 }
 
-CacheFile *BKE_cachefile_copy(Main *bmain, const CacheFile *cache_file)
+/**
+ * Only copy internal data of CacheFile ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_cachefile_copy_data(
+        Main *UNUSED(bmain), CacheFile *cache_file_dst, const CacheFile *UNUSED(cache_file_src), const int UNUSED(flag))
 {
-	CacheFile *new_cache_file = BKE_libblock_copy(bmain, &cache_file->id);
-	new_cache_file->handle = NULL;
-
-	BLI_listbase_clear(&new_cache_file->object_paths);
-
-	BKE_id_copy_ensure_local(bmain, &cache_file->id, &new_cache_file->id);
+	cache_file_dst->handle = NULL;
+	BLI_listbase_clear(&cache_file_dst->object_paths);
+}
 
-	return new_cache_file;
+CacheFile *BKE_cachefile_copy(Main *bmain, const CacheFile *cache_file)
+{
+	CacheFile *cache_file_copy;
+	BKE_id_copy_ex(bmain, &cache_file->id, (ID **)&cache_file_copy, 0, false);
+	return cache_file_copy;
 }
 
 void BKE_cachefile_make_local(Main *bmain, CacheFile *cache_file, const bool lib_local)
@@ -166,10 +176,12 @@ void BKE_cachefile_update_frame(Main *bmain, Scene *scene, const float ctime, co
 		const float time = BKE_cachefile_time_offset(cache_file, ctime, fps);
 
 		if (BKE_cachefile_filepath_get(bmain, cache_file, time, filename)) {
+			BKE_cachefile_clean(bmain, cache_file);
 #ifdef WITH_ALEMBIC
 			ABC_free_handle(cache_file->handle);
 			cache_file->handle = ABC_create_handle(filename, NULL);
 #endif
+			break;
 		}
 	}
 }
diff --git a/source/blender/blenkernel/intern/camera.c b/source/blender/blenkernel/intern/camera.c
index 2e36de4e8d4..97bb679f8b0 100644
--- a/source/blender/blenkernel/intern/camera.c
+++ b/source/blender/blenkernel/intern/camera.c
@@ -86,22 +86,31 @@ void *BKE_camera_add(Main *bmain, const char *name)
 {
 	Camera *cam;
 
-	cam =  BKE_libblock_alloc(bmain, ID_CA, name);
+	cam =  BKE_libblock_alloc(bmain, ID_CA, name, 0);
 
 	BKE_camera_init(cam);
 
 	return cam;
 }
 
-Camera *BKE_camera_copy(Main *bmain, const Camera *cam)
+/**
+ * Only copy internal data of Camera ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_camera_copy_data(Main *UNUSED(bmain), Camera *UNUSED(cam_dst), const Camera *UNUSED(cam_src), const int UNUSED(flag))
 {
-	Camera *camn;
-	
-	camn = BKE_libblock_copy(bmain, &cam->id);
-
-	BKE_id_copy_ensure_local(bmain, &cam->id, &camn->id);
+	/* Nothing to do! */
+}
 
-	return camn;
+Camera *BKE_camera_copy(Main *bmain, const Camera *cam)
+{
+	Camera *cam_copy;
+	BKE_id_copy_ex(bmain, &cam->id, (ID **)&cam_copy, 0, false);
+	return cam_copy;
 }
 
 void BKE_camera_make_local(Main *bmain, Camera *cam, const bool lib_local)
diff --git a/source/blender/blenkernel/intern/cdderivedmesh.c b/source/blender/blenkernel/intern/cdderivedmesh.c
index 155634c9d9c..d1282c1a0fe 100644
--- a/source/blender/blenkernel/intern/cdderivedmesh.c
+++ b/source/blender/blenkernel/intern/cdderivedmesh.c
@@ -34,10 +34,12 @@
  *  \ingroup bke
  */
 
+#include "atomic_ops.h"
+
 #include "BLI_math.h"
 #include "BLI_edgehash.h"
 #include "BLI_utildefines.h"
-#include "BLI_stackdefines.h"
+#include "BLI_utildefines_stack.h"
 
 #include "BKE_pbvh.h"
 #include "BKE_cdderivedmesh.h"
@@ -549,6 +551,11 @@ static void cdDM_drawMappedFaces(
 
 	const int *index_mp_to_orig  = dm->getPolyDataArray(dm, CD_ORIGINDEX);
 
+	if (cddm->pbvh) {
+		if (G.debug_value == 14)
+			BKE_pbvh_draw_BB(cddm->pbvh);
+	}
+
 	/* fist, setup common buffers */
 	GPU_vertex_setup(dm);
 	GPU_triangle_setup(dm);
@@ -1398,8 +1405,8 @@ static void cdDM_buffer_copy_mcol(
 
 	for (i = 0; i < totpoly; i++, mpoly++) {
 		for (j = 0; j < mpoly->totloop; j++) {
-			copy_v3_v3_uchar(&varray[start], &mloopcol[mpoly->loopstart + j].r);
-			start += 3;
+			copy_v4_v4_uchar(&varray[start], &mloopcol[mpoly->loopstart + j].r);
+			start += 4;
 		}
 	}
 }
@@ -1799,25 +1806,17 @@ void CDDM_recalc_looptri(DerivedMesh *dm)
 	const unsigned int totloop = dm->numLoopData;
 
 	DM_ensure_looptri_data(dm);
+	BLI_assert(totpoly == 0 || cddm->dm.looptris.array_wip != NULL);
 
 	BKE_mesh_recalc_looptri(
 	        cddm->mloop, cddm->mpoly,
 	        cddm->mvert,
 	        totloop, totpoly,
-	        cddm->dm.looptris.array);
-}
+	        cddm->dm.looptris.array_wip);
 
-static const MLoopTri *cdDM_getLoopTriArray(DerivedMesh *dm)
-{
-	if (dm->looptris.array) {
-		BLI_assert(poly_to_tri_count(dm->numPolyData, dm->numLoopData) == dm->looptris.num);
-	}
-	else {
-		dm->recalcLoopTri(dm);
-
-		/* ccdm is an exception here, that recalcLoopTri will fill in the array too  */
-	}
-	return dm->looptris.array;
+	BLI_assert(cddm->dm.looptris.array == NULL);
+	atomic_cas_ptr((void **)&cddm->dm.looptris.array, cddm->dm.looptris.array, cddm->dm.looptris.array_wip);
+	cddm->dm.looptris.array_wip = NULL;
 }
 
 static void cdDM_free_internal(CDDerivedMesh *cddm)
@@ -1870,8 +1869,6 @@ static CDDerivedMesh *cdDM_create(const char *desc)
 	dm->getEdgeDataArray = DM_get_edge_data_layer;
 	dm->getTessFaceDataArray = DM_get_tessface_data_layer;
 
-	dm->getLoopTriArray = cdDM_getLoopTriArray;
-
 	dm->calcNormals = CDDM_calc_normals;
 	dm->calcLoopNormals = CDDM_calc_loop_normals;
 	dm->calcLoopNormalsSpaceArray = CDDM_calc_loop_normals_spacearr;
@@ -3056,7 +3053,7 @@ DerivedMesh *CDDM_merge_verts(DerivedMesh *dm, const int *vtargetmap, const int
 						MPoly *target_poly = cddm->mpoly + *(cddm->pmap[v_target].indices + i_poly);
 
 						if (cddm_poly_compare(cddm->mloop, mp, target_poly, vtargetmap, +1) ||
-							cddm_poly_compare(cddm->mloop, mp, target_poly, vtargetmap, -1))
+						    cddm_poly_compare(cddm->mloop, mp, target_poly, vtargetmap, -1))
 						{
 							found = true;
 							break;
diff --git a/source/blender/blenkernel/intern/cloth.c b/source/blender/blenkernel/intern/cloth.c
index 6d0ad3255a2..09b793629f7 100644
--- a/source/blender/blenkernel/intern/cloth.c
+++ b/source/blender/blenkernel/intern/cloth.c
@@ -345,7 +345,7 @@ static int do_init_cloth(Object *ob, ClothModifierData *clmd, DerivedMesh *resul
 	return 1;
 }
 
-static int do_step_cloth(Object *ob, ClothModifierData *clmd, DerivedMesh *result, int framenr)
+static int do_step_cloth(const struct EvaluationContext *eval_ctx, Object *ob, ClothModifierData *clmd, DerivedMesh *result, int framenr)
 {
 	ClothVertex *verts = NULL;
 	Cloth *cloth;
@@ -370,7 +370,7 @@ static int do_step_cloth(Object *ob, ClothModifierData *clmd, DerivedMesh *resul
 		mul_m4_v3(ob->obmat, verts->xconst);
 	}
 
-	effectors = pdInitEffectors(clmd->scene, ob, NULL, clmd->sim_parms->effector_weights, true);
+	effectors = pdInitEffectors(eval_ctx, clmd->scene, ob, NULL, clmd->sim_parms->effector_weights, true);
 
 	if (clmd->sim_parms->flags & CLOTH_SIMSETTINGS_FLAG_DYNAMIC_BASEMESH )
 		cloth_update_verts ( ob, clmd, result );
@@ -400,7 +400,7 @@ static int do_step_cloth(Object *ob, ClothModifierData *clmd, DerivedMesh *resul
 /************************************************
  * clothModifier_do - main simulation function
  ************************************************/
-void clothModifier_do(ClothModifierData *clmd, Scene *scene, Object *ob, DerivedMesh *dm, float (*vertexCos)[3])
+void clothModifier_do(ClothModifierData *clmd, const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, DerivedMesh *dm, float (*vertexCos)[3])
 {
 	PointCache *cache;
 	PTCacheID pid;
@@ -489,7 +489,7 @@ void clothModifier_do(ClothModifierData *clmd, Scene *scene, Object *ob, Derived
 	/* do simulation */
 	BKE_ptcache_validate(cache, framenr);
 
-	if (!do_step_cloth(ob, clmd, dm, framenr)) {
+	if (!do_step_cloth(eval_ctx, ob, clmd, dm, framenr)) {
 		BKE_ptcache_invalidate(cache);
 	}
 	else
@@ -806,7 +806,6 @@ static int cloth_from_object(Object *ob, ClothModifierData *clmd, DerivedMesh *d
 	if ( !dm )
 		return 0;
 
-	DM_ensure_looptri(dm);
 	cloth_from_mesh ( clmd, dm );
 
 	// create springs
diff --git a/source/blender/blenkernel/intern/collection.c b/source/blender/blenkernel/intern/collection.c
index 3bf3a5ce5a4..2b69c176c39 100644
--- a/source/blender/blenkernel/intern/collection.c
+++ b/source/blender/blenkernel/intern/collection.c
@@ -261,6 +261,9 @@ void BKE_collection_object_add_from(Scene *scene, Object *ob_src, Object *ob_dst
 	for (SceneLayer *sl = scene->render_layers.first; sl; sl = sl->next) {
 		Base *base_src = BKE_scene_layer_base_find(sl, ob_src);
 		if (base_src != NULL) {
+			if (base_src->collection_properties == NULL) {
+				continue;
+			}
 			Base *base_dst = BKE_scene_layer_base_find(sl, ob_dst);
 			IDP_MergeGroup(base_dst->collection_properties, base_src->collection_properties, true);
 		}
@@ -565,7 +568,7 @@ void BKE_scene_collections_iterator_end(struct BLI_Iterator *iter)
 
 typedef struct SceneObjectsIteratorData {
 	GSet *visited;
-	LinkData *link;
+	LinkData *link_next;
 	BLI_Iterator scene_collection_iter;
 } SceneObjectsIteratorData;
 
@@ -597,8 +600,9 @@ static LinkData *object_base_unique(GSet *gs, LinkData *link)
 {
 	for (; link != NULL; link = link->next) {
 		Object *ob = link->data;
-		if (!BLI_gset_haskey(gs, ob)) {
-			BLI_gset_add(gs, ob);
+		void **ob_key_p;
+		if (!BLI_gset_ensure_p_ex(gs, ob, &ob_key_p)) {
+			*ob_key_p = ob;
 			return link;
 		}
 	}
@@ -608,10 +612,10 @@ static LinkData *object_base_unique(GSet *gs, LinkData *link)
 void BKE_scene_objects_iterator_next(BLI_Iterator *iter)
 {
 	SceneObjectsIteratorData *data = iter->data;
-	LinkData *link = data->link ? object_base_unique(data->visited, data->link->next) : NULL;
+	LinkData *link = data->link_next ? object_base_unique(data->visited, data->link_next) : NULL;
 
 	if (link) {
-		data->link = link;
+		data->link_next = link->next;
 		iter->current = link->data;
 	}
 	else {
@@ -623,8 +627,8 @@ void BKE_scene_objects_iterator_next(BLI_Iterator *iter)
 			/* get the first unique object of this collection */
 			LinkData *new_link = object_base_unique(data->visited, sc->objects.first);
 			if (new_link) {
-				data->link = new_link;
-				iter->current = data->link->data;
+				data->link_next = new_link->next;
+				iter->current = new_link->data;
 				return;
 			}
 			BKE_scene_collections_iterator_next(&data->scene_collection_iter);
diff --git a/source/blender/blenkernel/intern/colortools.c b/source/blender/blenkernel/intern/colortools.c
index ee0f904c3a6..310255a15c1 100644
--- a/source/blender/blenkernel/intern/colortools.c
+++ b/source/blender/blenkernel/intern/colortools.c
@@ -1380,7 +1380,7 @@ void scopes_update(Scopes *scopes, ImBuf *ibuf, const ColorManagedViewSettings *
 
 	/* Keep number of threads in sync with the merge parts below. */
 	ScopesUpdateData data = {
-		.scopes = scopes, . ibuf = ibuf,
+		.scopes = scopes, .ibuf = ibuf,
 		.cm_processor = cm_processor, .display_buffer = display_buffer, .ycc_mode = ycc_mode,
 		.bin_lum = bin_lum, .bin_r = bin_r, .bin_g = bin_g, .bin_b = bin_b, .bin_a = bin_a,
 	};
diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c
index 07a6b304dff..1c6bc7f98a2 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -689,7 +689,7 @@ static bConstraintTypeInfo CTI_CONSTRNAME = {
 /* This function should be used for the get_target_matrix member of all 
  * constraints that are not picky about what happens to their target matrix.
  */
-static void default_get_tarmat(bConstraint *con, bConstraintOb *UNUSED(cob), bConstraintTarget *ct, float UNUSED(ctime))
+static void default_get_tarmat(const struct EvaluationContext *UNUSED(eval_ctx), bConstraint *con, bConstraintOb *UNUSED(cob), bConstraintTarget *ct, float UNUSED(ctime))
 {
 	if (VALID_CONS_TARGET(ct))
 		constraint_target_to_mat4(ct->tar, ct->subtarget, ct->matrix, CONSTRAINT_SPACE_WORLD, ct->space, con->flag, con->headtail);
@@ -1019,7 +1019,7 @@ static void vectomat(const float vec[3], const float target_up[3], short axis, s
 	}
 
 	/* project the up vector onto the plane specified by n */
-	project_v3_v3v3(proj, u, n); /* first u onto n... */
+	project_v3_v3v3_normalized(proj, u, n); /* first u onto n... */
 	sub_v3_v3v3(proj, u, proj); /* then onto the plane */
 	/* proj specifies the transformation of the up axis */
 
@@ -1155,7 +1155,7 @@ static void kinematic_flush_tars(bConstraint *con, ListBase *list, bool no_copy)
 	}
 }
 
-static void kinematic_get_tarmat(bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
+static void kinematic_get_tarmat(const struct EvaluationContext *UNUSED(eval_ctx), bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
 {
 	bKinematicConstraint *data = con->data;
 	
@@ -1242,7 +1242,7 @@ static void followpath_flush_tars(bConstraint *con, ListBase *list, bool no_copy
 	}
 }
 
-static void followpath_get_tarmat(bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
+static void followpath_get_tarmat(const struct EvaluationContext *eval_ctx, bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
 {
 	bFollowPathConstraint *data = con->data;
 	
@@ -1259,7 +1259,7 @@ static void followpath_get_tarmat(bConstraint *con, bConstraintOb *cob, bConstra
 
 #ifdef CYCLIC_DEPENDENCY_WORKAROUND
 		if (ct->tar->curve_cache == NULL) {
-			BKE_displist_make_curveTypes(cob->scene, ct->tar, false);
+			BKE_displist_make_curveTypes(eval_ctx, cob->scene, ct->tar, false);
 		}
 #endif
 
@@ -1930,7 +1930,7 @@ static void samevolume_evaluate(bConstraint *con, bConstraintOb *cob, ListBase *
 	
 	/* calculate normalizing scale factor for non-essential values */
 	if (obsize[data->flag] != 0) 
-		fac = sqrtf(volume / obsize[data->flag]) / obsize[data->flag];
+		fac = sqrtf(volume / obsize[data->flag]);
 	
 	/* apply scaling factor to the channels not being kept */
 	switch (data->flag) {
@@ -2024,7 +2024,7 @@ static void pycon_id_looper(bConstraint *con, ConstraintIDFunc func, void *userd
 }
 
 /* Whether this approach is maintained remains to be seen (aligorith) */
-static void pycon_get_tarmat(bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
+static void pycon_get_tarmat(const struct EvaluationContext *eval_ctx, bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
 {
 #ifdef WITH_PYTHON
 	bPythonConstraint *data = con->data;
@@ -2035,7 +2035,7 @@ static void pycon_get_tarmat(bConstraint *con, bConstraintOb *cob, bConstraintTa
 		/* special exception for curves - depsgraph issues */
 		if (ct->tar->type == OB_CURVE) {
 			if (ct->tar->curve_cache == NULL) {
-				BKE_displist_make_curveTypes(cob->scene, ct->tar, false);
+				BKE_displist_make_curveTypes(eval_ctx, cob->scene, ct->tar, false);
 			}
 		}
 #endif
@@ -2142,7 +2142,7 @@ static void actcon_flush_tars(bConstraint *con, ListBase *list, bool no_copy)
 	}
 }
 
-static void actcon_get_tarmat(bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
+static void actcon_get_tarmat(const struct EvaluationContext *UNUSED(eval_ctx), bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
 {
 	bActionConstraint *data = con->data;
 	
@@ -3131,12 +3131,12 @@ static void clampto_flush_tars(bConstraint *con, ListBase *list, bool no_copy)
 	}
 }
 
-static void clampto_get_tarmat(bConstraint *UNUSED(con), bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
+static void clampto_get_tarmat(const struct EvaluationContext *eval_ctx, bConstraint *UNUSED(con), bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
 {
 #ifdef CYCLIC_DEPENDENCY_WORKAROUND
 	if (VALID_CONS_TARGET(ct)) {
 		if (ct->tar->curve_cache == NULL) {
-			BKE_displist_make_curveTypes(cob->scene, ct->tar, false);
+			BKE_displist_make_curveTypes(eval_ctx, cob->scene, ct->tar, false);
 		}
 	}
 #endif
@@ -3474,7 +3474,7 @@ static void shrinkwrap_flush_tars(bConstraint *con, ListBase *list, bool no_copy
 }
 
 
-static void shrinkwrap_get_tarmat(bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
+static void shrinkwrap_get_tarmat(const struct EvaluationContext *UNUSED(eval_ctx), bConstraint *con, bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
 {
 	bShrinkwrapConstraint *scon = (bShrinkwrapConstraint *) con->data;
 	
@@ -3806,12 +3806,12 @@ static void splineik_flush_tars(bConstraint *con, ListBase *list, bool no_copy)
 	}
 }
 
-static void splineik_get_tarmat(bConstraint *UNUSED(con), bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
+static void splineik_get_tarmat(const struct EvaluationContext *eval_ctx, bConstraint *UNUSED(con), bConstraintOb *cob, bConstraintTarget *ct, float UNUSED(ctime))
 {
 #ifdef CYCLIC_DEPENDENCY_WORKAROUND
 	if (VALID_CONS_TARGET(ct)) {
 		if (ct->tar->curve_cache == NULL) {
-			BKE_displist_make_curveTypes(cob->scene, ct->tar, false);
+			BKE_displist_make_curveTypes(eval_ctx, cob->scene, ct->tar, false);
 		}
 	}
 #endif
@@ -4737,29 +4737,30 @@ static void con_fix_copied_refs_cb(bConstraint *UNUSED(con), ID **idpoin, bool i
 }
 
 /* duplicate all of the constraints in a constraint stack */
-void BKE_constraints_copy(ListBase *dst, const ListBase *src, bool do_extern)
+void BKE_constraints_copy_ex(ListBase *dst, const ListBase *src, const int flag, bool do_extern)
 {
 	bConstraint *con, *srccon;
-	
+
 	BLI_listbase_clear(dst);
 	BLI_duplicatelist(dst, src);
-	
+
 	for (con = dst->first, srccon = src->first; con && srccon; srccon = srccon->next, con = con->next) {
 		const bConstraintTypeInfo *cti = BKE_constraint_typeinfo_get(con);
-		
+
 		/* make a new copy of the constraint's data */
 		con->data = MEM_dupallocN(con->data);
-		
+
 		/* only do specific constraints if required */
 		if (cti) {
 			/* perform custom copying operations if needed */
 			if (cti->copy_data)
 				cti->copy_data(con, srccon);
-				
-			/* fix usercounts for all referenced data in referenced data */
-			if (cti->id_looper)
+
+			/* Fix usercounts for all referenced data that need it. */
+			if (cti->id_looper && (flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
 				cti->id_looper(con, con_fix_copied_refs_cb, NULL);
-			
+			}
+
 			/* for proxies we don't want to make extern */
 			if (do_extern) {
 				/* go over used ID-links for this constraint to ensure that they are valid for proxies */
@@ -4770,6 +4771,11 @@ void BKE_constraints_copy(ListBase *dst, const ListBase *src, bool do_extern)
 	}
 }
 
+void BKE_constraints_copy(ListBase *dst, const ListBase *src, bool do_extern)
+{
+	BKE_constraints_copy_ex(dst, src, 0, do_extern);
+}
+
 /* ......... */
 
 bConstraint *BKE_constraints_find_name(ListBase *list, const char *name)
@@ -4858,7 +4864,7 @@ bool BKE_constraints_proxylocked_owner(Object *ob, bPoseChannel *pchan)
  * None of the actual calculations of the matrices should be done here! Also, this function is
  * not to be used by any new constraints, particularly any that have multiple targets.
  */
-void BKE_constraint_target_matrix_get(Scene *scene, bConstraint *con, int index, short ownertype, void *ownerdata, float mat[4][4], float ctime)
+void BKE_constraint_target_matrix_get(const struct EvaluationContext *eval_ctx, Scene *scene, bConstraint *con, int index, short ownertype, void *ownerdata, float mat[4][4], float ctime)
 {
 	const bConstraintTypeInfo *cti = BKE_constraint_typeinfo_get(con);
 	ListBase targets = {NULL, NULL};
@@ -4909,7 +4915,7 @@ void BKE_constraint_target_matrix_get(Scene *scene, bConstraint *con, int index,
 		
 		if (ct) {
 			if (cti->get_target_matrix)
-				cti->get_target_matrix(con, cob, ct, ctime);
+				cti->get_target_matrix(eval_ctx, con, cob, ct, ctime);
 			copy_m4_m4(mat, ct->matrix);
 		}
 		
@@ -4925,7 +4931,7 @@ void BKE_constraint_target_matrix_get(Scene *scene, bConstraint *con, int index,
 }
 
 /* Get the list of targets required for solving a constraint */
-void BKE_constraint_targets_for_solving_get(bConstraint *con, bConstraintOb *cob, ListBase *targets, float ctime)
+void BKE_constraint_targets_for_solving_get(const struct EvaluationContext *eval_ctx, bConstraint *con, bConstraintOb *cob, ListBase *targets, float ctime)
 {
 	const bConstraintTypeInfo *cti = BKE_constraint_typeinfo_get(con);
 	
@@ -4943,7 +4949,7 @@ void BKE_constraint_targets_for_solving_get(bConstraint *con, bConstraintOb *cob
 		 */
 		if (cti->get_target_matrix) {
 			for (ct = targets->first; ct; ct = ct->next)
-				cti->get_target_matrix(con, cob, ct, ctime);
+				cti->get_target_matrix(eval_ctx, con, cob, ct, ctime);
 		}
 		else {
 			for (ct = targets->first; ct; ct = ct->next)
@@ -4960,7 +4966,7 @@ void BKE_constraint_targets_for_solving_get(bConstraint *con, bConstraintOb *cob
  * BKE_constraints_make_evalob and BKE_constraints_clear_evalob should be called before and 
  * after running this function, to sort out cob
  */
-void BKE_constraints_solve(ListBase *conlist, bConstraintOb *cob, float ctime)
+void BKE_constraints_solve(const struct EvaluationContext *eval_ctx, ListBase *conlist, bConstraintOb *cob, float ctime)
 {
 	bConstraint *con;
 	float oldmat[4][4];
@@ -4995,7 +5001,7 @@ void BKE_constraints_solve(ListBase *conlist, bConstraintOb *cob, float ctime)
 		BKE_constraint_mat_convertspace(cob->ob, cob->pchan, cob->matrix, CONSTRAINT_SPACE_WORLD, con->ownspace, false);
 		
 		/* prepare targets for constraint solving */
-		BKE_constraint_targets_for_solving_get(con, cob, &targets, ctime);
+		BKE_constraint_targets_for_solving_get(eval_ctx, con, cob, &targets, ctime);
 		
 		/* Solve the constraint and put result in cob->matrix */
 		cti->evaluate_constraint(con, cob, &targets);
diff --git a/source/blender/blenkernel/intern/context.c b/source/blender/blenkernel/intern/context.c
index ac214a70b75..4f1dd18b39c 100644
--- a/source/blender/blenkernel/intern/context.c
+++ b/source/blender/blenkernel/intern/context.c
@@ -52,6 +52,7 @@
 #include "BKE_context.h"
 #include "BKE_layer.h"
 #include "BKE_main.h"
+#include "BKE_scene.h"
 #include "BKE_screen.h"
 #include "BKE_sound.h"
 #include "BKE_workspace.h"
@@ -76,6 +77,7 @@ struct bContext {
 		struct ScrArea *area;
 		struct ARegion *region;
 		struct ARegion *menu;
+		struct wmManipulatorGroup *manipulator_group;
 		struct bContextStore *store;
 		const char *operator_poll_msg; /* reason for poll failing */
 	} wm;
@@ -670,6 +672,11 @@ struct ARegion *CTX_wm_menu(const bContext *C)
 	return C->wm.menu;
 }
 
+struct wmManipulatorGroup *CTX_wm_manipulator_group(const bContext *C)
+{
+	return C->wm.manipulator_group;
+}
+
 struct ReportList *CTX_wm_reports(const bContext *C)
 {
 	if (C->wm.manager)
@@ -869,6 +876,11 @@ void CTX_wm_menu_set(bContext *C, ARegion *menu)
 	C->wm.menu = menu;
 }
 
+void CTX_wm_manipulator_group_set(bContext *C, struct wmManipulatorGroup *mgroup)
+{
+	C->wm.manipulator_group = mgroup;
+}
+
 void CTX_wm_operator_poll_msg_set(bContext *C, const char *msg)
 {
 	C->wm.operator_poll_msg = msg;
@@ -915,7 +927,7 @@ SceneLayer *CTX_data_scene_layer(const bContext *C)
 		return sl;
 	}
 	else {
-		return BKE_scene_layer_context_active(CTX_data_scene(C));
+		return BKE_scene_layer_from_workspace_get(CTX_wm_workspace(C));
 	}
 }
 
@@ -1225,5 +1237,17 @@ int CTX_data_editable_gpencil_strokes(const bContext *C, ListBase *list)
 Depsgraph *CTX_data_depsgraph(const bContext *C)
 {
 	Scene *scene = CTX_data_scene(C);
-	return scene->depsgraph;
+	SceneLayer *scene_layer = CTX_data_scene_layer(C);
+	return BKE_scene_get_depsgraph(scene, scene_layer);
+}
+
+void CTX_data_eval_ctx(const bContext *C, EvaluationContext *eval_ctx)
+{
+	BLI_assert(C != NULL);
+
+	Scene *scene = CTX_data_scene(C);
+	SceneLayer *scene_layer = CTX_data_scene_layer(C);
+	DEG_evaluation_context_init_from_scene(eval_ctx,
+	                                       scene, scene_layer,
+	                                       DAG_EVAL_VIEWPORT);
 }
diff --git a/source/blender/blenkernel/intern/crazyspace.c b/source/blender/blenkernel/intern/crazyspace.c
index 56df8e51eba..d2ffbbcf27b 100644
--- a/source/blender/blenkernel/intern/crazyspace.c
+++ b/source/blender/blenkernel/intern/crazyspace.c
@@ -99,7 +99,8 @@ static int modifiers_disable_subsurf_temporary(Object *ob)
 }
 
 /* disable subsurf temporal, get mapped cos, and enable it */
-float (*BKE_crazyspace_get_mapped_editverts(Scene *scene, Object *obedit))[3]
+float (*BKE_crazyspace_get_mapped_editverts(
+           const struct EvaluationContext *eval_ctx, Scene *scene, Object *obedit))[3]
 {
 	Mesh *me = obedit->data;
 	DerivedMesh *dm;
@@ -109,13 +110,13 @@ float (*BKE_crazyspace_get_mapped_editverts(Scene *scene, Object *obedit))[3]
 	/* disable subsurf temporal, get mapped cos, and enable it */
 	if (modifiers_disable_subsurf_temporary(obedit)) {
 		/* need to make new derivemesh */
-		makeDerivedMesh(scene, obedit, me->edit_btmesh, CD_MASK_BAREMESH, false);
+		makeDerivedMesh(eval_ctx, scene, obedit, me->edit_btmesh, CD_MASK_BAREMESH, false);
 	}
 
 	/* now get the cage */
 	vertexcos = MEM_mallocN(sizeof(*vertexcos) * nverts, "vertexcos map");
 
-	dm = editbmesh_get_derived_cage(scene, obedit, me->edit_btmesh, CD_MASK_BAREMESH);
+	dm = editbmesh_get_derived_cage(eval_ctx, scene, obedit, me->edit_btmesh, CD_MASK_BAREMESH);
 
 	mesh_get_mapped_verts_coords(dm, vertexcos, nverts);
 
@@ -250,8 +251,9 @@ void BKE_crazyspace_set_quats_mesh(Mesh *me, float (*origcos)[3], float (*mapped
 
 /** returns an array of deform matrices for crazyspace correction, and the
  * number of modifiers left */
-int BKE_crazyspace_get_first_deform_matrices_editbmesh(Scene *scene, Object *ob, BMEditMesh *em,
-                                        float (**deformmats)[3][3], float (**deformcos)[3])
+int BKE_crazyspace_get_first_deform_matrices_editbmesh(
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, BMEditMesh *em,
+        float (**deformmats)[3][3], float (**deformcos)[3])
 {
 	ModifierData *md;
 	DerivedMesh *dm;
@@ -290,7 +292,7 @@ int BKE_crazyspace_get_first_deform_matrices_editbmesh(Scene *scene, Object *ob,
 					unit_m3(defmats[a]);
 			}
 
-			mti->deformMatricesEM(md, ob, em, dm, deformedVerts, defmats,
+			mti->deformMatricesEM(md, eval_ctx, ob, em, dm, deformedVerts, defmats,
 			                      numVerts);
 		}
 		else
@@ -310,7 +312,9 @@ int BKE_crazyspace_get_first_deform_matrices_editbmesh(Scene *scene, Object *ob,
 	return numleft;
 }
 
-int BKE_sculpt_get_first_deform_matrices(Scene *scene, Object *ob, float (**deformmats)[3][3], float (**deformcos)[3])
+int BKE_sculpt_get_first_deform_matrices(
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, float (**deformmats)[3][3], float (**deformcos)[3])
 {
 	ModifierData *md;
 	DerivedMesh *dm;
@@ -346,7 +350,7 @@ int BKE_sculpt_get_first_deform_matrices(Scene *scene, Object *ob, float (**defo
 					unit_m3(defmats[a]);
 			}
 
-			if (mti->deformMatrices) mti->deformMatrices(md, ob, dm, deformedVerts, defmats, numVerts);
+			if (mti->deformMatrices) mti->deformMatrices(md, eval_ctx, ob, dm, deformedVerts, defmats, numVerts);
 			else break;
 		}
 	}
@@ -369,9 +373,9 @@ int BKE_sculpt_get_first_deform_matrices(Scene *scene, Object *ob, float (**defo
 	return numleft;
 }
 
-void BKE_crazyspace_build_sculpt(Scene *scene, Object *ob, float (**deformmats)[3][3], float (**deformcos)[3])
+void BKE_crazyspace_build_sculpt(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float (**deformmats)[3][3], float (**deformcos)[3])
 {
-	int totleft = BKE_sculpt_get_first_deform_matrices(scene, ob, deformmats, deformcos);
+	int totleft = BKE_sculpt_get_first_deform_matrices(eval_ctx, scene, ob, deformmats, deformcos);
 
 	if (totleft) {
 		/* there are deformation modifier which doesn't support deformation matrices
@@ -396,7 +400,7 @@ void BKE_crazyspace_build_sculpt(Scene *scene, Object *ob, float (**deformmats)[
 				if (mti->deformMatrices && !deformed)
 					continue;
 
-				mti->deformVerts(md, ob, NULL, deformedVerts, me->totvert, 0);
+				mti->deformVerts(md, eval_ctx, ob, NULL, deformedVerts, me->totvert, 0);
 				deformed = 1;
 			}
 		}
diff --git a/source/blender/blenkernel/intern/curve.c b/source/blender/blenkernel/intern/curve.c
index 8a6d9f57093..5fbaae7212b 100644
--- a/source/blender/blenkernel/intern/curve.c
+++ b/source/blender/blenkernel/intern/curve.c
@@ -182,7 +182,7 @@ Curve *BKE_curve_add(Main *bmain, const char *name, int type)
 {
 	Curve *cu;
 
-	cu = BKE_libblock_alloc(bmain, ID_CU, name);
+	cu = BKE_libblock_alloc(bmain, ID_CU, name, 0);
 	cu->type = type;
 
 	BKE_curve_init(cu);
@@ -190,43 +190,40 @@ Curve *BKE_curve_add(Main *bmain, const char *name, int type)
 	return cu;
 }
 
-Curve *BKE_curve_copy(Main *bmain, const Curve *cu)
+/**
+ * Only copy internal data of Curve ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_curve_copy_data(Main *bmain, Curve *cu_dst, const Curve *cu_src, const int flag)
 {
-	Curve *cun;
-	int a;
+	BLI_listbase_clear(&cu_dst->nurb);
+	BKE_nurbList_duplicate(&(cu_dst->nurb), &(cu_src->nurb));
 
-	cun = BKE_libblock_copy(bmain, &cu->id);
+	cu_dst->mat = MEM_dupallocN(cu_src->mat);
 
-	BLI_listbase_clear(&cun->nurb);
-	BKE_nurbList_duplicate(&(cun->nurb), &(cu->nurb));
+	cu_dst->str = MEM_dupallocN(cu_src->str);
+	cu_dst->strinfo = MEM_dupallocN(cu_src->strinfo);
+	cu_dst->tb = MEM_dupallocN(cu_src->tb);
+	cu_dst->bb = MEM_dupallocN(cu_src->bb);
+	cu_dst->batch_cache = NULL;
 
-	cun->mat = MEM_dupallocN(cu->mat);
-	for (a = 0; a < cun->totcol; a++) {
-		id_us_plus((ID *)cun->mat[a]);
+	if (cu_src->key) {
+		BKE_id_copy_ex(bmain, &cu_src->key->id, (ID **)&cu_dst->key, flag, false);
 	}
 
-	cun->str = MEM_dupallocN(cu->str);
-	cun->strinfo = MEM_dupallocN(cu->strinfo);
-	cun->tb = MEM_dupallocN(cu->tb);
-	cun->bb = MEM_dupallocN(cu->bb);
-	cun->batch_cache = NULL;
-
-	if (cu->key) {
-		cun->key = BKE_key_copy(bmain, cu->key);
-		cun->key->from = (ID *)cun;
-	}
-
-	cun->editnurb = NULL;
-	cun->editfont = NULL;
-
-	id_us_plus((ID *)cun->vfont);
-	id_us_plus((ID *)cun->vfontb);
-	id_us_plus((ID *)cun->vfonti);
-	id_us_plus((ID *)cun->vfontbi);
-
-	BKE_id_copy_ensure_local(bmain, &cu->id, &cun->id);
+	cu_dst->editnurb = NULL;
+	cu_dst->editfont = NULL;
+}
 
-	return cun;
+Curve *BKE_curve_copy(Main *bmain, const Curve *cu)
+{
+	Curve *cu_copy;
+	BKE_id_copy_ex(bmain, &cu->id, (ID **)&cu_copy, 0, false);
+	return cu_copy;
 }
 
 void BKE_curve_make_local(Main *bmain, Curve *cu, const bool lib_local)
@@ -748,6 +745,7 @@ BezTriple *BKE_nurb_bezt_get_prev(Nurb *nu, BezTriple *bezt)
 	BezTriple *bezt_prev;
 
 	BLI_assert(ARRAY_HAS_ITEM(bezt, nu->bezt, nu->pntsu));
+	BLI_assert(nu->pntsv == 1);
 
 	if (bezt == nu->bezt) {
 		if (nu->flagu & CU_NURB_CYCLIC) {
@@ -769,6 +767,7 @@ BPoint *BKE_nurb_bpoint_get_prev(Nurb *nu, BPoint *bp)
 	BPoint *bp_prev;
 
 	BLI_assert(ARRAY_HAS_ITEM(bp, nu->bp, nu->pntsu));
+	BLI_assert(nu->pntsv == 1);
 
 	if (bp == nu->bp) {
 		if (nu->flagu & CU_NURB_CYCLIC) {
@@ -785,7 +784,7 @@ BPoint *BKE_nurb_bpoint_get_prev(Nurb *nu, BPoint *bp)
 	return bp_prev;
 }
 
-void BKE_nurb_bezt_calc_normal(struct Nurb *UNUSED(nu), struct BezTriple *bezt, float r_normal[3])
+void BKE_nurb_bezt_calc_normal(struct Nurb *UNUSED(nu), BezTriple *bezt, float r_normal[3])
 {
 	/* calculate the axis matrix from the spline */
 	float dir_prev[3], dir_next[3];
@@ -800,7 +799,7 @@ void BKE_nurb_bezt_calc_normal(struct Nurb *UNUSED(nu), struct BezTriple *bezt,
 	normalize_v3(r_normal);
 }
 
-void BKE_nurb_bezt_calc_plane(struct Nurb *nu, struct BezTriple *bezt, float r_plane[3])
+void BKE_nurb_bezt_calc_plane(struct Nurb *nu, BezTriple *bezt, float r_plane[3])
 {
 	float dir_prev[3], dir_next[3];
 
@@ -837,7 +836,7 @@ void BKE_nurb_bezt_calc_plane(struct Nurb *nu, struct BezTriple *bezt, float r_p
 	normalize_v3(r_plane);
 }
 
-void BKE_nurb_bpoint_calc_normal(struct Nurb *nu, struct BPoint *bp, float r_normal[3])
+void BKE_nurb_bpoint_calc_normal(struct Nurb *nu, BPoint *bp, float r_normal[3])
 {
 	BPoint *bp_prev = BKE_nurb_bpoint_get_prev(nu, bp);
 	BPoint *bp_next = BKE_nurb_bpoint_get_next(nu, bp);
@@ -860,6 +859,34 @@ void BKE_nurb_bpoint_calc_normal(struct Nurb *nu, struct BPoint *bp, float r_nor
 	normalize_v3(r_normal);
 }
 
+void BKE_nurb_bpoint_calc_plane(struct Nurb *nu, BPoint *bp, float r_plane[3])
+{
+	BPoint *bp_prev = BKE_nurb_bpoint_get_prev(nu, bp);
+	BPoint *bp_next = BKE_nurb_bpoint_get_next(nu, bp);
+
+	float dir_prev[3] = {0.0f}, dir_next[3] = {0.0f};
+
+	if (bp_prev) {
+		sub_v3_v3v3(dir_prev, bp_prev->vec, bp->vec);
+		normalize_v3(dir_prev);
+	}
+	if (bp_next) {
+		sub_v3_v3v3(dir_next, bp->vec, bp_next->vec);
+		normalize_v3(dir_next);
+	}
+	cross_v3_v3v3(r_plane, dir_prev, dir_next);
+
+	/* matches with bones more closely */
+	{
+		float dir_mid[3], tvec[3];
+		add_v3_v3v3(dir_mid, dir_prev, dir_next);
+		cross_v3_v3v3(tvec, r_plane, dir_mid);
+		copy_v3_v3(r_plane, tvec);
+	}
+
+	normalize_v3(r_plane);
+}
+
 /* ~~~~~~~~~~~~~~~~~~~~Non Uniform Rational B Spline calculations ~~~~~~~~~~~ */
 
 
@@ -1595,7 +1622,7 @@ float *BKE_curve_surf_make_orco(Object *ob)
 /* NOTE: This routine is tied to the order of vertex
  * built by displist and as passed to the renderer.
  */
-float *BKE_curve_make_orco(Scene *scene, Object *ob, int *r_numVerts)
+float *BKE_curve_make_orco(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, int *r_numVerts)
 {
 	Curve *cu = ob->data;
 	DispList *dl;
@@ -1603,7 +1630,7 @@ float *BKE_curve_make_orco(Scene *scene, Object *ob, int *r_numVerts)
 	float *fp, *coord_array;
 	ListBase disp = {NULL, NULL};
 
-	BKE_displist_make_curveTypes_forOrco(scene, ob, &disp);
+	BKE_displist_make_curveTypes_forOrco(eval_ctx, scene, ob, &disp);
 
 	numVerts = 0;
 	for (dl = disp.first; dl; dl = dl->next) {
@@ -1694,8 +1721,9 @@ float *BKE_curve_make_orco(Scene *scene, Object *ob, int *r_numVerts)
 
 /* ***************** BEVEL ****************** */
 
-void BKE_curve_bevel_make(Scene *scene, Object *ob, ListBase *disp,
-                          const bool for_render, const bool use_render_resolution)
+void BKE_curve_bevel_make(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *disp,
+        const bool for_render, const bool use_render_resolution)
 {
 	DispList *dl, *dlnew;
 	Curve *bevcu, *cu;
@@ -1719,7 +1747,7 @@ void BKE_curve_bevel_make(Scene *scene, Object *ob, ListBase *disp,
 			facy = cu->bevobj->size[1];
 
 			if (for_render) {
-				BKE_displist_make_curveTypes_forRender(scene, cu->bevobj, &bevdisp, NULL, false, use_render_resolution);
+				BKE_displist_make_curveTypes_forRender(eval_ctx, scene, cu->bevobj, &bevdisp, NULL, false, use_render_resolution);
 				dl = bevdisp.first;
 			}
 			else if (cu->bevobj->curve_cache) {
@@ -4016,7 +4044,7 @@ bool BKE_nurb_check_valid_u(struct Nurb *nu)
 		return true;           /* not a nurb, lets assume its valid */
 
 	if (nu->pntsu < nu->orderu) return false;
-	if (((nu->flag & CU_NURB_CYCLIC) == 0) && (nu->flagu & CU_NURB_BEZIER)) { /* Bezier U Endpoints */
+	if (((nu->flagu & CU_NURB_CYCLIC) == 0) && (nu->flagu & CU_NURB_BEZIER)) { /* Bezier U Endpoints */
 		if (nu->orderu == 4) {
 			if (nu->pntsu < 5)
 				return false;  /* bezier with 4 orderu needs 5 points */
@@ -4037,7 +4065,7 @@ bool BKE_nurb_check_valid_v(struct Nurb *nu)
 
 	if (nu->pntsv < nu->orderv)
 		return false;
-	if (((nu->flag & CU_NURB_CYCLIC) == 0) && (nu->flagv & CU_NURB_BEZIER)) { /* Bezier V Endpoints */
+	if (((nu->flagv & CU_NURB_CYCLIC) == 0) && (nu->flagv & CU_NURB_BEZIER)) { /* Bezier V Endpoints */
 		if (nu->orderv == 4) {
 			if (nu->pntsv < 5)
 				return false;  /* bezier with 4 orderu needs 5 points */
@@ -4419,7 +4447,9 @@ bool BKE_curve_center_bounds(Curve *cu, float cent[3])
 }
 
 
-void BKE_curve_transform_ex(Curve *cu, float mat[4][4], const bool do_keys, const float unit_scale)
+void BKE_curve_transform_ex(
+        Curve *cu, float mat[4][4],
+        const bool do_keys, const bool do_props, const float unit_scale)
 {
 	Nurb *nu;
 	BPoint *bp;
@@ -4433,7 +4463,9 @@ void BKE_curve_transform_ex(Curve *cu, float mat[4][4], const bool do_keys, cons
 				mul_m4_v3(mat, bezt->vec[0]);
 				mul_m4_v3(mat, bezt->vec[1]);
 				mul_m4_v3(mat, bezt->vec[2]);
-				bezt->radius *= unit_scale;
+				if (do_props) {
+					bezt->radius *= unit_scale;
+				}
 			}
 			BKE_nurb_handles_calc(nu);
 		}
@@ -4441,7 +4473,9 @@ void BKE_curve_transform_ex(Curve *cu, float mat[4][4], const bool do_keys, cons
 			i = nu->pntsu * nu->pntsv;
 			for (bp = nu->bp; i--; bp++) {
 				mul_m4_v3(mat, bp->vec);
-				bp->radius *= unit_scale;
+				if (do_props) {
+					bp->radius *= unit_scale;
+				}
 			}
 		}
 	}
@@ -4457,10 +4491,12 @@ void BKE_curve_transform_ex(Curve *cu, float mat[4][4], const bool do_keys, cons
 	}
 }
 
-void BKE_curve_transform(Curve *cu, float mat[4][4], const bool do_keys)
+void BKE_curve_transform(
+        Curve *cu, float mat[4][4],
+        const bool do_keys, const bool do_props)
 {
 	float unit_scale = mat4_to_scale(mat);
-	BKE_curve_transform_ex(cu, mat, do_keys, unit_scale);
+	BKE_curve_transform_ex(cu, mat, do_keys, do_props, unit_scale);
 }
 
 void BKE_curve_translate(Curve *cu, float offset[3], const bool do_keys)
@@ -4639,7 +4675,7 @@ void BKE_curve_rect_from_textbox(const struct Curve *cu, const struct TextBox *t
 
 /* **** Depsgraph evaluation **** */
 
-void BKE_curve_eval_geometry(EvaluationContext *UNUSED(eval_ctx),
+void BKE_curve_eval_geometry(const EvaluationContext *UNUSED(eval_ctx),
                              Curve *curve)
 {
 	if (G.debug & G_DEBUG_DEPSGRAPH) {
@@ -4650,17 +4686,6 @@ void BKE_curve_eval_geometry(EvaluationContext *UNUSED(eval_ctx),
 	}
 }
 
-void BKE_curve_eval_path(EvaluationContext *UNUSED(eval_ctx),
-                         Curve *curve)
-{
-	/* TODO(sergey): This will probably need to be a part of
-	 * the modifier stack still.
-	 */
-	if (G.debug & G_DEBUG_DEPSGRAPH) {
-		printf("%s on %s\n", __func__, curve->id.name);
-	}
-}
-
 /* Draw Engine */
 void (*BKE_curve_batch_cache_dirty_cb)(Curve *cu, int mode) = NULL;
 void (*BKE_curve_batch_cache_free_cb)(Curve *cu) = NULL;
@@ -4676,4 +4701,4 @@ void BKE_curve_batch_cache_free(Curve *cu)
 	if (cu->batch_cache) {
 		BKE_curve_batch_cache_free_cb(cu);
 	}
-}
\ No newline at end of file
+}
diff --git a/source/blender/blenkernel/intern/customdata.c b/source/blender/blenkernel/intern/customdata.c
index 3ccf619fd11..3bf5784e674 100644
--- a/source/blender/blenkernel/intern/customdata.c
+++ b/source/blender/blenkernel/intern/customdata.c
@@ -810,10 +810,10 @@ static void layerInterp_mloopcol(
 	 * although weights should also not cause this situation */
 
 	/* also delay writing to the destination incase dest is in sources */
-	mc->r = CLAMPIS(iroundf(col.r), 0, 255);
-	mc->g = CLAMPIS(iroundf(col.g), 0, 255);
-	mc->b = CLAMPIS(iroundf(col.b), 0, 255);
-	mc->a = CLAMPIS(iroundf(col.a), 0, 255);
+	mc->r = round_fl_to_uchar_clamp(col.r);
+	mc->g = round_fl_to_uchar_clamp(col.g);
+	mc->b = round_fl_to_uchar_clamp(col.b);
+	mc->a = round_fl_to_uchar_clamp(col.a);
 }
 
 static int layerMaxNum_mloopcol(void)
@@ -1036,10 +1036,10 @@ static void layerInterp_mcol(
 		
 		/* Subdivide smooth or fractal can cause problems without clamping
 		 * although weights should also not cause this situation */
-		mc[j].a = CLAMPIS(iroundf(col[j].a), 0, 255);
-		mc[j].r = CLAMPIS(iroundf(col[j].r), 0, 255);
-		mc[j].g = CLAMPIS(iroundf(col[j].g), 0, 255);
-		mc[j].b = CLAMPIS(iroundf(col[j].b), 0, 255);
+		mc[j].a = round_fl_to_uchar_clamp(col[j].a);
+		mc[j].r = round_fl_to_uchar_clamp(col[j].r);
+		mc[j].g = round_fl_to_uchar_clamp(col[j].g);
+		mc[j].b = round_fl_to_uchar_clamp(col[j].b);
 	}
 }
 
@@ -1344,7 +1344,7 @@ const CustomDataMask CD_MASK_BMESH =
     CD_MASK_PROP_STR | CD_MASK_SHAPEKEY | CD_MASK_SHAPE_KEYINDEX | CD_MASK_MDISPS |
     CD_MASK_CREASE | CD_MASK_BWEIGHT | CD_MASK_RECAST | CD_MASK_PAINT_MASK |
     CD_MASK_GRID_PAINT_MASK | CD_MASK_MVERT_SKIN | CD_MASK_FREESTYLE_EDGE | CD_MASK_FREESTYLE_FACE |
-	CD_MASK_CUSTOMLOOPNORMAL | CD_MASK_FACEMAP;
+    CD_MASK_CUSTOMLOOPNORMAL | CD_MASK_FACEMAP;
 /**
  * cover values copied by #BKE_mesh_loops_to_tessdata
  */
diff --git a/source/blender/blenkernel/intern/data_transfer.c b/source/blender/blenkernel/intern/data_transfer.c
index a83ec8f0486..00b8063110d 100644
--- a/source/blender/blenkernel/intern/data_transfer.c
+++ b/source/blender/blenkernel/intern/data_transfer.c
@@ -1010,7 +1010,8 @@ static bool data_transfer_layersmapping_generate(
  * to get (as much as possible) exact copy of source data layout.
  */
 void BKE_object_data_transfer_layout(
-        Scene *scene, Object *ob_src, Object *ob_dst, const int data_types, const bool use_delete,
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob_src, Object *ob_dst, const int data_types, const bool use_delete,
         const int fromlayers_select[DT_MULTILAYER_INDEX_MAX], const int tolayers_select[DT_MULTILAYER_INDEX_MAX])
 {
 	DerivedMesh *dm_src;
@@ -1027,7 +1028,7 @@ void BKE_object_data_transfer_layout(
 
 	/* Get source DM.*/
 	dm_src_mask |= BKE_object_data_transfer_dttypes_to_cdmask(data_types);
-	dm_src = mesh_get_derived_final(scene, ob_src, dm_src_mask);
+	dm_src = mesh_get_derived_final(eval_ctx, scene, ob_src, dm_src_mask);
 	if (!dm_src) {
 		return;
 	}
@@ -1085,9 +1086,9 @@ void BKE_object_data_transfer_layout(
 }
 
 bool BKE_object_data_transfer_dm(
-        Scene *scene, Object *ob_src, Object *ob_dst, DerivedMesh *dm_dst, const int data_types, bool use_create,
-        const int map_vert_mode, const int map_edge_mode, const int map_loop_mode, const int map_poly_mode,
-        SpaceTransform *space_transform, const bool auto_transform,
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob_src, Object *ob_dst, DerivedMesh *dm_dst,
+        const int data_types, bool use_create, const int map_vert_mode, const int map_edge_mode,
+        const int map_loop_mode, const int map_poly_mode, SpaceTransform *space_transform, const bool auto_transform,
         const float max_distance, const float ray_radius, const float islands_handling_precision,
         const int fromlayers_select[DT_MULTILAYER_INDEX_MAX], const int tolayers_select[DT_MULTILAYER_INDEX_MAX],
         const int mix_mode, const float mix_factor, const char *vgroup_name, const bool invert_vgroup,
@@ -1149,7 +1150,7 @@ bool BKE_object_data_transfer_dm(
 	 *     Also, we need to make a local copy of dm_src, otherwise we may end with concurrent creation
 	 *     of data in it (multi-threaded evaluation of the modifier stack, see T46672).
 	 */
-	dm_src = dm_dst ? ob_src->derivedFinal : mesh_get_derived_final(scene, ob_src, dm_src_mask);
+	dm_src = dm_dst ? ob_src->derivedFinal : mesh_get_derived_final(eval_ctx, scene, ob_src, dm_src_mask);
 	if (!dm_src) {
 		return changed;
 	}
@@ -1457,16 +1458,16 @@ bool BKE_object_data_transfer_dm(
 }
 
 bool BKE_object_data_transfer_mesh(
-        Scene *scene, Object *ob_src, Object *ob_dst, const int data_types, const bool use_create,
-        const int map_vert_mode, const int map_edge_mode, const int map_loop_mode, const int map_poly_mode,
-        SpaceTransform *space_transform, const bool auto_transform,
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob_src, Object *ob_dst, const int data_types,
+        const bool use_create, const int map_vert_mode, const int map_edge_mode, const int map_loop_mode,
+        const int map_poly_mode, SpaceTransform *space_transform, const bool auto_transform,
         const float max_distance, const float ray_radius, const float islands_handling_precision,
         const int fromlayers_select[DT_MULTILAYER_INDEX_MAX], const int tolayers_select[DT_MULTILAYER_INDEX_MAX],
         const int mix_mode, const float mix_factor, const char *vgroup_name, const bool invert_vgroup,
         ReportList *reports)
 {
 	return BKE_object_data_transfer_dm(
-	        scene, ob_src, ob_dst, NULL, data_types, use_create,
+	        eval_ctx, scene, ob_src, ob_dst, NULL, data_types, use_create,
 	        map_vert_mode, map_edge_mode, map_loop_mode, map_poly_mode,
 	        space_transform, auto_transform,
 	        max_distance, ray_radius, islands_handling_precision,
diff --git a/source/blender/blenkernel/intern/deform.c b/source/blender/blenkernel/intern/deform.c
index 9f0024c01fd..1fc83b69bfe 100644
--- a/source/blender/blenkernel/intern/deform.c
+++ b/source/blender/blenkernel/intern/deform.c
@@ -74,7 +74,7 @@ bDeformGroup *BKE_defgroup_new(Object *ob, const char *name)
 	BLI_addtail(&ob->defbase, defgroup);
 	defgroup_unique_name(defgroup, ob);
 
-	BKE_mesh_batch_cache_dirty(ob->data, BKE_MESH_BATCH_DIRTY_PAINT);
+	BKE_mesh_batch_cache_dirty(ob->data, BKE_MESH_BATCH_DIRTY_ALL);
 
 	return defgroup;
 }
@@ -624,8 +624,17 @@ float defvert_find_weight(const struct MDeformVert *dvert, const int defgroup)
  */
 float defvert_array_find_weight_safe(const struct MDeformVert *dvert, const int index, const int defgroup)
 {
-	if (defgroup == -1 || dvert == NULL)
+	/* Invalid defgroup index means the vgroup selected is invalid, does not exist, in that case it is OK to return 1.0
+	 * (i.e. maximum weight, as if no vgroup was selected).
+	 * But in case of valid defgroup and NULL dvert data pointer, it means that vgroup **is** valid,
+	 * and just totally empty, so we shall return '0.0' value then!
+	*/
+	if (defgroup == -1) {
 		return 1.0f;
+	}
+	else if (dvert == NULL) {
+		return 0.0f;
+	}
 
 	return defvert_find_weight(dvert + index, defgroup);
 }
diff --git a/source/blender/blenkernel/intern/displist.c b/source/blender/blenkernel/intern/displist.c
index 44f284d043e..8316d68b35c 100644
--- a/source/blender/blenkernel/intern/displist.c
+++ b/source/blender/blenkernel/intern/displist.c
@@ -678,7 +678,7 @@ static void curve_to_filledpoly(Curve *cu, ListBase *UNUSED(nurb), ListBase *dis
  * - first point left, last point right
  * - based on subdivided points in original curve, not on points in taper curve (still)
  */
-static float displist_calc_taper(Scene *scene, Object *taperobj, float fac)
+static float displist_calc_taper(const EvaluationContext *eval_ctx, Scene *scene, Object *taperobj, float fac)
 {
 	DispList *dl;
 
@@ -687,7 +687,7 @@ static float displist_calc_taper(Scene *scene, Object *taperobj, float fac)
 
 	dl = taperobj->curve_cache ? taperobj->curve_cache->disp.first : NULL;
 	if (dl == NULL) {
-		BKE_displist_make_curveTypes(scene, taperobj, 0);
+		BKE_displist_make_curveTypes(eval_ctx, scene, taperobj, 0);
 		dl = taperobj->curve_cache->disp.first;
 	}
 	if (dl) {
@@ -718,14 +718,14 @@ static float displist_calc_taper(Scene *scene, Object *taperobj, float fac)
 	return 1.0;
 }
 
-float BKE_displist_calc_taper(Scene *scene, Object *taperobj, int cur, int tot)
+float BKE_displist_calc_taper(const EvaluationContext *eval_ctx, Scene *scene, Object *taperobj, int cur, int tot)
 {
 	float fac = ((float)cur) / (float)(tot - 1);
 
-	return displist_calc_taper(scene, taperobj, fac);
+	return displist_calc_taper(eval_ctx, scene, taperobj, fac);
 }
 
-void BKE_displist_make_mball(EvaluationContext *eval_ctx, Scene *scene, Object *ob)
+void BKE_displist_make_mball(const EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
 	if (!ob || ob->type != OB_MBALL)
 		return;
@@ -748,7 +748,7 @@ void BKE_displist_make_mball(EvaluationContext *eval_ctx, Scene *scene, Object *
 	}
 }
 
-void BKE_displist_make_mball_forRender(EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase)
+void BKE_displist_make_mball_forRender(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase)
 {
 	BKE_mball_polygonize(eval_ctx, scene, ob, dispbase);
 	BKE_mball_texspace_calc(ob);
@@ -798,8 +798,9 @@ static ModifierData *curve_get_tessellate_point(Scene *scene, Object *ob,
 	return pretessellatePoint;
 }
 
-static void curve_calc_modifiers_pre(Scene *scene, Object *ob, ListBase *nurb,
-                                     const bool for_render, const bool use_render_resolution)
+static void curve_calc_modifiers_pre(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *nurb,
+        const bool for_render, const bool use_render_resolution)
 {
 	VirtualModifierData virtualModifierData;
 	ModifierData *md = modifiers_getVirtualModifierList(ob, &virtualModifierData);
@@ -856,7 +857,7 @@ static void curve_calc_modifiers_pre(Scene *scene, Object *ob, ListBase *nurb,
 				deformedVerts = BKE_curve_nurbs_vertexCos_get(nurb, &numVerts);
 			}
 
-			mti->deformVerts(md, ob, NULL, deformedVerts, numVerts, app_flag);
+			mti->deformVerts(md, eval_ctx, ob, NULL, deformedVerts, numVerts, app_flag);
 
 			if (md == pretessellatePoint)
 				break;
@@ -908,9 +909,10 @@ static void displist_apply_allverts(ListBase *dispbase, float (*allverts)[3])
 	}
 }
 
-static void curve_calc_modifiers_post(Scene *scene, Object *ob, ListBase *nurb,
-                                      ListBase *dispbase, DerivedMesh **r_dm_final,
-                                      const bool for_render, const bool use_render_resolution)
+static void curve_calc_modifiers_post(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *nurb,
+        ListBase *dispbase, DerivedMesh **r_dm_final,
+        const bool for_render, const bool use_render_resolution)
 {
 	VirtualModifierData virtualModifierData;
 	ModifierData *md = modifiers_getVirtualModifierList(ob, &virtualModifierData);
@@ -964,14 +966,14 @@ static void curve_calc_modifiers_post(Scene *scene, Object *ob, ListBase *nurb,
 					dm->getVertCos(dm, vertCos);
 				}
 
-				mti->deformVerts(md, ob, dm, vertCos, totvert, appf);
+				mti->deformVerts(md, eval_ctx, ob, dm, vertCos, totvert, appf);
 			}
 			else {
 				if (!vertCos) {
 					vertCos = displist_get_allverts(dispbase, &totvert);
 				}
 
-				mti->deformVerts(md, ob, NULL, vertCos, totvert, appf);
+				mti->deformVerts(md, eval_ctx, ob, NULL, vertCos, totvert, appf);
 			}
 		}
 		else {
@@ -1013,7 +1015,7 @@ static void curve_calc_modifiers_post(Scene *scene, Object *ob, ListBase *nurb,
 			if (useCache)
 				appf |= MOD_APPLY_USECACHE;
 
-			ndm = modwrap_applyModifier(md, ob, dm, appf);
+			ndm = modwrap_applyModifier(md, eval_ctx, ob, dm, appf);
 
 			if (ndm) {
 				/* Modifier returned a new derived mesh */
@@ -1090,13 +1092,13 @@ static void displist_surf_indices(DispList *dl)
 	}
 }
 
-static DerivedMesh *create_orco_dm(Scene *scene, Object *ob)
+static DerivedMesh *create_orco_dm(const EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
 	DerivedMesh *dm;
 	ListBase disp = {NULL, NULL};
 
 	/* OrcoDM should be created from underformed disp lists */
-	BKE_displist_make_curveTypes_forOrco(scene, ob, &disp);
+	BKE_displist_make_curveTypes_forOrco(eval_ctx, scene, ob, &disp);
 	dm = CDDM_from_curve_displist(ob, &disp);
 
 	BKE_displist_free(&disp);
@@ -1134,8 +1136,9 @@ static void add_orco_dm(Object *ob, DerivedMesh *dm, DerivedMesh *orcodm)
 		DM_add_vert_layer(dm, CD_ORCO, CD_ASSIGN, orco);
 }
 
-static void curve_calc_orcodm(Scene *scene, Object *ob, DerivedMesh *dm_final,
-                              const bool for_render, const bool use_render_resolution)
+static void curve_calc_orcodm(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, DerivedMesh *dm_final,
+        const bool for_render, const bool use_render_resolution)
 {
 	/* this function represents logic of mesh's orcodm calculation
 	 * for displist-based objects
@@ -1172,7 +1175,7 @@ static void curve_calc_orcodm(Scene *scene, Object *ob, DerivedMesh *dm_final,
 	 * This means we can create ORCO DM in advance and assume it's
 	 * never NULL.
 	 */
-	orcodm = create_orco_dm(scene, ob);
+	orcodm = create_orco_dm(eval_ctx, scene, ob);
 
 	for (; md; md = md->next) {
 		const ModifierTypeInfo *mti = modifierType_getInfo(md->type);
@@ -1184,7 +1187,7 @@ static void curve_calc_orcodm(Scene *scene, Object *ob, DerivedMesh *dm_final,
 		if (mti->type != eModifierTypeType_Constructive)
 			continue;
 
-		ndm = modwrap_applyModifier(md, ob, orcodm, app_flag);
+		ndm = modwrap_applyModifier(md, eval_ctx, ob, orcodm, app_flag);
 
 		if (ndm) {
 			/* if the modifier returned a new dm, release the old one */
@@ -1201,9 +1204,10 @@ static void curve_calc_orcodm(Scene *scene, Object *ob, DerivedMesh *dm_final,
 	orcodm->release(orcodm);
 }
 
-void BKE_displist_make_surf(Scene *scene, Object *ob, ListBase *dispbase,
-                            DerivedMesh **r_dm_final,
-                            const bool for_render, const bool for_orco, const bool use_render_resolution)
+void BKE_displist_make_surf(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase,
+        DerivedMesh **r_dm_final,
+        const bool for_render, const bool for_orco, const bool use_render_resolution)
 {
 	ListBase nubase = {NULL, NULL};
 	Nurb *nu;
@@ -1220,7 +1224,7 @@ void BKE_displist_make_surf(Scene *scene, Object *ob, ListBase *dispbase,
 	}
 
 	if (!for_orco)
-		curve_calc_modifiers_pre(scene, ob, &nubase, for_render, use_render_resolution);
+		curve_calc_modifiers_pre(eval_ctx, scene, ob, &nubase, for_render, use_render_resolution);
 
 	for (nu = nubase.first; nu; nu = nu->next) {
 		if ((for_render || nu->hide == 0) && BKE_nurb_check_valid_uv(nu)) {
@@ -1287,7 +1291,7 @@ void BKE_displist_make_surf(Scene *scene, Object *ob, ListBase *dispbase,
 
 	if (!for_orco) {
 		BKE_nurbList_duplicate(&ob->curve_cache->deformed_nurbs, &nubase);
-		curve_calc_modifiers_post(scene, ob, &nubase, dispbase, r_dm_final,
+		curve_calc_modifiers_post(eval_ctx, scene, ob, &nubase, dispbase, r_dm_final,
 		                          for_render, use_render_resolution);
 	}
 
@@ -1513,9 +1517,10 @@ static void calc_bevfac_mapping(Curve *cu, BevList *bl, Nurb *nu,
 	}
 }
 
-static void do_makeDispListCurveTypes(Scene *scene, Object *ob, ListBase *dispbase,
-                                      DerivedMesh **r_dm_final,
-                                      const bool for_render, const bool for_orco, const bool use_render_resolution)
+static void do_makeDispListCurveTypes(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase,
+        DerivedMesh **r_dm_final,
+        const bool for_render, const bool for_orco, const bool use_render_resolution)
 {
 	Curve *cu = ob->data;
 
@@ -1523,7 +1528,7 @@ static void do_makeDispListCurveTypes(Scene *scene, Object *ob, ListBase *dispba
 	if (!ELEM(ob->type, OB_SURF, OB_CURVE, OB_FONT)) return;
 
 	if (ob->type == OB_SURF) {
-		BKE_displist_make_surf(scene, ob, dispbase, r_dm_final, for_render, for_orco, use_render_resolution);
+		BKE_displist_make_surf(eval_ctx, scene, ob, dispbase, r_dm_final, for_render, for_orco, use_render_resolution);
 	}
 	else if (ELEM(ob->type, OB_CURVE, OB_FONT)) {
 		ListBase dlbev;
@@ -1548,12 +1553,12 @@ static void do_makeDispListCurveTypes(Scene *scene, Object *ob, ListBase *dispba
 		}
 
 		if (!for_orco)
-			curve_calc_modifiers_pre(scene, ob, &nubase, for_render, use_render_resolution);
+			curve_calc_modifiers_pre(eval_ctx, scene, ob, &nubase, for_render, use_render_resolution);
 
 		BKE_curve_bevelList_make(ob, &nubase, for_render != false);
 
 		/* If curve has no bevel will return nothing */
-		BKE_curve_bevel_make(scene, ob, &dlbev, for_render, use_render_resolution);
+		BKE_curve_bevel_make(eval_ctx, scene, ob, &dlbev, for_render, use_render_resolution);
 
 		/* no bevel or extrude, and no width correction? */
 		if (!dlbev.first && cu->width == 1.0f) {
@@ -1688,7 +1693,7 @@ static void do_makeDispListCurveTypes(Scene *scene, Object *ob, ListBase *dispba
 											taper_fac -= (1.0f - lastblend) / len;
 									}
 
-									fac = displist_calc_taper(scene, cu->taperobj, taper_fac);
+									fac = displist_calc_taper(eval_ctx, scene, cu->taperobj, taper_fac);
 								}
 
 								if (bevp->split_tag) {
@@ -1740,8 +1745,9 @@ static void do_makeDispListCurveTypes(Scene *scene, Object *ob, ListBase *dispba
 		}
 
 		if (!for_orco) {
+			/* TODO(sergey): How do we get depsgraph here? */
 			if ((cu->flag & CU_PATH) ||
-			    DEG_get_eval_flags_for_id(scene->depsgraph, &ob->id) & DAG_EVAL_NEED_CURVE_PATH)
+			    DEG_get_eval_flags_for_id(scene->depsgraph_legacy, &ob->id) & DAG_EVAL_NEED_CURVE_PATH)
 			{
 				calc_curvepath(ob, &nubase);
 			}
@@ -1749,7 +1755,7 @@ static void do_makeDispListCurveTypes(Scene *scene, Object *ob, ListBase *dispba
 
 		if (!for_orco) {
 			BKE_nurbList_duplicate(&ob->curve_cache->deformed_nurbs, &nubase);
-			curve_calc_modifiers_post(scene, ob, &nubase, dispbase, r_dm_final, for_render, use_render_resolution);
+			curve_calc_modifiers_post(eval_ctx, scene, ob, &nubase, dispbase, r_dm_final, for_render, use_render_resolution);
 		}
 
 		if (cu->flag & CU_DEFORM_FILL && !ob->derivedFinal) {
@@ -1760,7 +1766,7 @@ static void do_makeDispListCurveTypes(Scene *scene, Object *ob, ListBase *dispba
 	}
 }
 
-void BKE_displist_make_curveTypes(Scene *scene, Object *ob, const bool for_orco)
+void BKE_displist_make_curveTypes(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, const bool for_orco)
 {
 	ListBase *dispbase;
 
@@ -1778,35 +1784,38 @@ void BKE_displist_make_curveTypes(Scene *scene, Object *ob, const bool for_orco)
 
 	dispbase = &(ob->curve_cache->disp);
 
-	do_makeDispListCurveTypes(scene, ob, dispbase, &ob->derivedFinal, 0, for_orco, 0);
+	do_makeDispListCurveTypes(eval_ctx, scene, ob, dispbase, &ob->derivedFinal, 0, for_orco, 0);
 
 	boundbox_displist_object(ob);
 }
 
-void BKE_displist_make_curveTypes_forRender(Scene *scene, Object *ob, ListBase *dispbase,
-                                            DerivedMesh **r_dm_final, const bool for_orco,
-                                            const bool use_render_resolution)
+void BKE_displist_make_curveTypes_forRender(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase,
+        DerivedMesh **r_dm_final, const bool for_orco,
+        const bool use_render_resolution)
 {
 	if (ob->curve_cache == NULL) {
 		ob->curve_cache = MEM_callocN(sizeof(CurveCache), "CurveCache for Curve");
 	}
 
-	do_makeDispListCurveTypes(scene, ob, dispbase, r_dm_final, true, for_orco, use_render_resolution);
+	do_makeDispListCurveTypes(eval_ctx, scene, ob, dispbase, r_dm_final, true, for_orco, use_render_resolution);
 }
 
-void BKE_displist_make_curveTypes_forOrco(struct Scene *scene, struct Object *ob, struct ListBase *dispbase)
+void BKE_displist_make_curveTypes_forOrco(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase)
 {
 	if (ob->curve_cache == NULL) {
 		ob->curve_cache = MEM_callocN(sizeof(CurveCache), "CurveCache for Curve");
 	}
 
-	do_makeDispListCurveTypes(scene, ob, dispbase, NULL, 1, 1, 1);
+	do_makeDispListCurveTypes(eval_ctx, scene, ob, dispbase, NULL, 1, 1, 1);
 }
 
 /* add Orco layer to the displist object which has got derived mesh and return orco */
-float *BKE_displist_make_orco(Scene *scene, Object *ob, DerivedMesh *dm_final,
-                              const bool for_render,
-                              const bool use_render_resolution)
+float *BKE_displist_make_orco(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, DerivedMesh *dm_final,
+        const bool for_render,
+        const bool use_render_resolution)
 {
 	float *orco;
 
@@ -1814,7 +1823,7 @@ float *BKE_displist_make_orco(Scene *scene, Object *ob, DerivedMesh *dm_final,
 		dm_final = ob->derivedFinal;
 
 	if (!dm_final->getVertDataArray(dm_final, CD_ORCO)) {
-		curve_calc_orcodm(scene, ob, dm_final, for_render, use_render_resolution);
+		curve_calc_orcodm(eval_ctx, scene, ob, dm_final, for_render, use_render_resolution);
 	}
 
 	orco = dm_final->getVertDataArray(dm_final, CD_ORCO);
diff --git a/source/blender/blenkernel/intern/dynamicpaint.c b/source/blender/blenkernel/intern/dynamicpaint.c
index fb5ef403218..724b30d0cb1 100644
--- a/source/blender/blenkernel/intern/dynamicpaint.c
+++ b/source/blender/blenkernel/intern/dynamicpaint.c
@@ -74,6 +74,8 @@
 #include "BKE_scene.h"
 #include "BKE_texture.h"
 
+#include "DEG_depsgraph.h"
+
 /* for image output	*/
 #include "IMB_imbuf_types.h"
 #include "IMB_imbuf.h"
@@ -498,7 +500,7 @@ static int surface_getBrushFlags(DynamicPaintSurface *surface, const SceneLayer
 	if (surface->brush_group)
 		go = surface->brush_group->gobject.first;
 	else
-		base = FIRSTBASE_NEW;
+		base = FIRSTBASE_NEW(sl);
 
 	while (base || go) {
 		brushObj = NULL;
@@ -1973,7 +1975,9 @@ static void canvas_copyDerivedMesh(DynamicPaintCanvasSettings *canvas, DerivedMe
 /*
  *	Updates derived mesh copy and processes dynamic paint step / caches.
  */
-static void dynamicPaint_frameUpdate(DynamicPaintModifierData *pmd, Scene *scene, SceneLayer *sl, Object *ob, DerivedMesh *dm)
+static void dynamicPaint_frameUpdate(
+        DynamicPaintModifierData *pmd, const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, DerivedMesh *dm)
 {
 	if (pmd->canvas) {
 		DynamicPaintCanvasSettings *canvas = pmd->canvas;
@@ -2036,7 +2040,7 @@ static void dynamicPaint_frameUpdate(DynamicPaintModifierData *pmd, Scene *scene
 				else if (can_simulate) {
 					/* calculate surface frame */
 					canvas->flags |= MOD_DPAINT_BAKING;
-					dynamicPaint_calculateFrame(surface, scene, sl, ob, current_frame);
+					dynamicPaint_calculateFrame(surface, eval_ctx, scene, ob, current_frame);
 					canvas->flags &= ~MOD_DPAINT_BAKING;
 
 					/* restore canvas derivedmesh if required */
@@ -2055,16 +2059,15 @@ static void dynamicPaint_frameUpdate(DynamicPaintModifierData *pmd, Scene *scene
 }
 
 /* Modifier call. Processes dynamic paint modifier step. */
-DerivedMesh *dynamicPaint_Modifier_do(DynamicPaintModifierData *pmd, Scene *scene, SceneLayer *sl, Object *ob, DerivedMesh *dm)
+DerivedMesh *dynamicPaint_Modifier_do(
+        DynamicPaintModifierData *pmd, const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, DerivedMesh *dm)
 {
 	if (pmd->canvas) {
 		DerivedMesh *ret;
 
-		/* For now generate looptris in every case */
-		DM_ensure_looptri(dm);
-
 		/* Update canvas data for a new frame */
-		dynamicPaint_frameUpdate(pmd, scene, sl, ob, dm);
+		dynamicPaint_frameUpdate(pmd, eval_ctx, scene, ob, dm);
 
 		/* Return output mesh */
 		ret = dynamicPaint_Modifier_apply(pmd, ob, dm);
@@ -2072,11 +2075,8 @@ DerivedMesh *dynamicPaint_Modifier_do(DynamicPaintModifierData *pmd, Scene *scen
 		return ret;
 	}
 	else {
-		/* For now generate looptris in every case */
-		DM_ensure_looptri(dm);
-
 		/* Update canvas data for a new frame */
-		dynamicPaint_frameUpdate(pmd, scene, sl, ob, dm);
+		dynamicPaint_frameUpdate(pmd, eval_ctx, scene, ob, dm);
 
 		/* Return output mesh */
 		return dynamicPaint_Modifier_apply(pmd, ob, dm);
@@ -3582,7 +3582,8 @@ static void dynamic_paint_brush_velocity_compute_cb(void *userdata, const int i)
 }
 
 static void dynamicPaint_brushMeshCalculateVelocity(
-        Scene *scene, Object *ob, DynamicPaintBrushSettings *brush, Vec3f **brushVel, float timescale)
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *ob, DynamicPaintBrushSettings *brush, Vec3f **brushVel, float timescale)
 {
 	float prev_obmat[4][4];
 	DerivedMesh *dm_p, *dm_c;
@@ -3604,7 +3605,7 @@ static void dynamicPaint_brushMeshCalculateVelocity(
 	scene->r.subframe = prev_sfra;
 
 	BKE_object_modifier_update_subframe(
-	            scene, ob, true, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
+	            eval_ctx, scene, ob, true, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
 	dm_p = CDDM_copy(brush->dm);
 	numOfVerts_p = dm_p->getNumVerts(dm_p);
 	mvert_p = dm_p->getVertArray(dm_p);
@@ -3615,7 +3616,7 @@ static void dynamicPaint_brushMeshCalculateVelocity(
 	scene->r.subframe = cur_sfra;
 
 	BKE_object_modifier_update_subframe(
-	            scene, ob, true, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
+	            eval_ctx, scene, ob, true, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
 	dm_c = brush->dm;
 	numOfVerts_c = dm_c->getNumVerts(dm_c);
 	mvert_c = dm_p->getVertArray(dm_c);
@@ -3640,7 +3641,7 @@ static void dynamicPaint_brushMeshCalculateVelocity(
 }
 
 /* calculate velocity for object center point */
-static void dynamicPaint_brushObjectCalculateVelocity(Scene *scene, Object *ob, Vec3f *brushVel, float timescale)
+static void dynamicPaint_brushObjectCalculateVelocity(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, Vec3f *brushVel, float timescale)
 {
 	float prev_obmat[4][4];
 	float cur_loc[3] = {0.0f}, prev_loc[3] = {0.0f};
@@ -3659,14 +3660,14 @@ static void dynamicPaint_brushObjectCalculateVelocity(Scene *scene, Object *ob,
 	scene->r.cfra = prev_fra;
 	scene->r.subframe = prev_sfra;
 	BKE_object_modifier_update_subframe(
-	            scene, ob, false, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
+	            eval_ctx, scene, ob, false, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
 	copy_m4_m4(prev_obmat, ob->obmat);
 
 	/* current frame dm */
 	scene->r.cfra = cur_fra;
 	scene->r.subframe = cur_sfra;
 	BKE_object_modifier_update_subframe(
-	            scene, ob, false, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
+	            eval_ctx, scene, ob, false, SUBFRAME_RECURSION, BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
 
 	/* calculate speed */
 	mul_m4_v3(prev_obmat, prev_loc);
@@ -4036,7 +4037,7 @@ static void dynamic_paint_paint_mesh_cell_point_cb_ex(
 	}
 }
 
-static int dynamicPaint_paintMesh(DynamicPaintSurface *surface,
+static int dynamicPaint_paintMesh(const struct EvaluationContext *eval_ctx, DynamicPaintSurface *surface,
                                   DynamicPaintBrushSettings *brush,
                                   Object *brushOb,
                                   BrushMaterials *bMats,
@@ -4052,7 +4053,7 @@ static int dynamicPaint_paintMesh(DynamicPaintSurface *surface,
 	const MLoop *mloop = NULL;
 
 	if (brush->flags & MOD_DPAINT_USES_VELOCITY)
-		dynamicPaint_brushMeshCalculateVelocity(scene, brushOb, brush, &brushVelocity, timescale);
+		dynamicPaint_brushMeshCalculateVelocity(eval_ctx, scene, brushOb, brush, &brushVelocity, timescale);
 
 	if (!brush->dm)
 		return 0;
@@ -4530,7 +4531,7 @@ static void dynamic_paint_paint_single_point_cb_ex(
 }
 
 static int dynamicPaint_paintSinglePoint(
-        DynamicPaintSurface *surface, float *pointCoord, DynamicPaintBrushSettings *brush,
+        const struct EvaluationContext *eval_ctx, DynamicPaintSurface *surface, float *pointCoord, DynamicPaintBrushSettings *brush,
         Object *brushOb, BrushMaterials *bMats, Scene *scene, float timescale)
 {
 	PaintSurfaceData *sData = surface->data;
@@ -4538,7 +4539,7 @@ static int dynamicPaint_paintSinglePoint(
 	Vec3f brushVel;
 
 	if (brush->flags & MOD_DPAINT_USES_VELOCITY)
-		dynamicPaint_brushObjectCalculateVelocity(scene, brushOb, &brushVel, timescale);
+		dynamicPaint_brushObjectCalculateVelocity(eval_ctx, scene, brushOb, &brushVel, timescale);
 
 	const MVert *mvert = brush->dm->getVertArray(brush->dm);
 
@@ -4845,7 +4846,7 @@ static void dynamic_paint_prepare_effect_cb(void *userdata, const int index)
 }
 
 static int dynamicPaint_prepareEffectStep(
-        DynamicPaintSurface *surface, Scene *scene, Object *ob, float **force, float timescale)
+        const struct EvaluationContext *eval_ctx, DynamicPaintSurface *surface, Scene *scene, Object *ob, float **force, float timescale)
 {
 	double average_force = 0.0f;
 	float shrink_speed = 0.0f, spread_speed = 0.0f;
@@ -4856,7 +4857,7 @@ static int dynamicPaint_prepareEffectStep(
 
 	/* Init force data if required */
 	if (surface->effect & MOD_DPAINT_EFFECT_DO_DRIP) {
-		ListBase *effectors = pdInitEffectors(scene, ob, NULL, surface->effector_weights, true);
+		ListBase *effectors = pdInitEffectors(eval_ctx, scene, ob, NULL, surface->effector_weights, true);
 
 		/* allocate memory for force data (dir vector + strength) */
 		*force = MEM_mallocN(sData->total_points * 4 * sizeof(float), "PaintEffectForces");
@@ -5758,7 +5759,7 @@ static int dynamicPaint_generateBakeData(DynamicPaintSurface *surface, const Sce
 /*
  * Do Dynamic Paint step. Paints scene brush objects of current state/frame to the surface.
  */
-static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, DynamicPaintSurface *surface, float timescale, float subframe)
+static int dynamicPaint_doStep(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, DynamicPaintSurface *surface, float timescale, float subframe)
 {
 	PaintSurfaceData *sData = surface->data;
 	PaintBakeData *bData = sData->bData;
@@ -5782,6 +5783,7 @@ static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, Dynamic
 		GroupObject *go = NULL;
 		Object *brushObj = NULL;
 		ModifierData *md = NULL;
+		SceneLayer *sl = eval_ctx->scene_layer;
 
 		/* backup current scene frame */
 		int scene_frame = scene->r.cfra;
@@ -5791,7 +5793,7 @@ static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, Dynamic
 		if (surface->brush_group)
 			go = surface->brush_group->gobject.first;
 		else
-			base = FIRSTBASE_NEW;
+			base = FIRSTBASE_NEW(sl);
 
 		while (base || go) {
 			brushObj = NULL;
@@ -5836,7 +5838,7 @@ static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, Dynamic
 					/* update object data on this subframe */
 					if (subframe) {
 						scene_setSubframe(scene, subframe);
-						BKE_object_modifier_update_subframe(scene, brushObj, true, SUBFRAME_RECURSION,
+						BKE_object_modifier_update_subframe(eval_ctx, scene, brushObj, true, SUBFRAME_RECURSION,
 						                                    BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
 					}
 					/* Prepare materials if required	*/
@@ -5855,11 +5857,11 @@ static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, Dynamic
 						}
 					/* Object center distance: */
 					if (brush->collision == MOD_DPAINT_COL_POINT && brushObj != ob) {
-						dynamicPaint_paintSinglePoint(surface, brushObj->loc, brush, brushObj, &bMats, scene, timescale);
+						dynamicPaint_paintSinglePoint(eval_ctx, surface, brushObj->loc, brush, brushObj, &bMats, scene, timescale);
 					}
 					/* Mesh volume/proximity: */
 					else if (brushObj != ob) {
-						dynamicPaint_paintMesh(surface, brush, brushObj, &bMats, scene, timescale);
+						dynamicPaint_paintMesh(eval_ctx, surface, brush, brushObj, &bMats, scene, timescale);
 					}
 
 					/* free temp material data */
@@ -5869,7 +5871,7 @@ static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, Dynamic
 					if (subframe) {
 						scene->r.cfra = scene_frame;
 						scene->r.subframe = scene_subframe;
-						BKE_object_modifier_update_subframe(scene, brushObj, true, SUBFRAME_RECURSION,
+						BKE_object_modifier_update_subframe(eval_ctx, scene, brushObj, true, SUBFRAME_RECURSION,
 						                                    BKE_scene_frame_get(scene), eModifierType_DynamicPaint);
 					}
 
@@ -5904,7 +5906,7 @@ static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, Dynamic
 				return setError(canvas, N_("Not enough free memory"));
 
 			/* Prepare effects and get number of required steps */
-			steps = dynamicPaint_prepareEffectStep(surface, scene, ob, &force, timescale);
+			steps = dynamicPaint_prepareEffectStep(eval_ctx, surface, scene, ob, &force, timescale);
 			for (s = 0; s < steps; s++) {
 				dynamicPaint_doEffectStep(surface, force, prevPoint, timescale, (float)steps);
 			}
@@ -5928,7 +5930,9 @@ static int dynamicPaint_doStep(Scene *scene, SceneLayer *sl, Object *ob, Dynamic
 /*
  * Calculate a single frame and included subframes for surface
  */
-int dynamicPaint_calculateFrame(DynamicPaintSurface *surface, Scene *scene, SceneLayer *sl, Object *cObject, int frame)
+int dynamicPaint_calculateFrame(
+        DynamicPaintSurface *surface, const struct EvaluationContext *eval_ctx,
+        Scene *scene, Object *cObject, int frame)
 {
 	float timescale = 1.0f;
 
@@ -5937,7 +5941,7 @@ int dynamicPaint_calculateFrame(DynamicPaintSurface *surface, Scene *scene, Scen
 		dynamicPaint_applySurfaceDisplace(surface, surface->canvas->dm);
 
 	/* update bake data */
-	dynamicPaint_generateBakeData(surface, sl, cObject);
+	dynamicPaint_generateBakeData(surface, eval_ctx->scene_layer, cObject);
 
 	/* don't do substeps for first frame */
 	if (surface->substeps && (frame != surface->start_frame)) {
@@ -5946,10 +5950,10 @@ int dynamicPaint_calculateFrame(DynamicPaintSurface *surface, Scene *scene, Scen
 
 		for (st = 1; st <= surface->substeps; st++) {
 			float subframe = ((float) st) / (surface->substeps + 1);
-			if (!dynamicPaint_doStep(scene, sl, cObject, surface, timescale, subframe))
+			if (!dynamicPaint_doStep(eval_ctx, scene, cObject, surface, timescale, subframe))
 				return 0;
 		}
 	}
 
-	return dynamicPaint_doStep(scene, sl, cObject, surface, timescale, 0.0f);
+	return dynamicPaint_doStep(eval_ctx, scene, cObject, surface, timescale, 0.0f);
 }
diff --git a/source/blender/blenkernel/intern/editderivedmesh.c b/source/blender/blenkernel/intern/editderivedmesh.c
index c8ae3598097..0491cbd21f0 100644
--- a/source/blender/blenkernel/intern/editderivedmesh.c
+++ b/source/blender/blenkernel/intern/editderivedmesh.c
@@ -41,6 +41,8 @@
  * is likely to be a little slow.
  */
 
+#include "atomic_ops.h"
+
 #include "BLI_math.h"
 #include "BLI_jitter.h"
 #include "BLI_bitmap.h"
@@ -279,8 +281,9 @@ static void emDM_recalcLoopTri(DerivedMesh *dm)
 	int i;
 
 	DM_ensure_looptri_data(dm);
-	mlooptri = dm->looptris.array;
+	mlooptri = dm->looptris.array_wip;
 
+	BLI_assert(tottri == 0 || mlooptri != NULL);
 	BLI_assert(poly_to_tri_count(dm->numPolyData, dm->numLoopData) == dm->looptris.num);
 	BLI_assert(tottri == dm->looptris.num);
 
@@ -297,18 +300,10 @@ static void emDM_recalcLoopTri(DerivedMesh *dm)
 		        BM_elem_index_get(ltri[2]));
 		lt->poly = BM_elem_index_get(ltri[0]->f);
 	}
-}
-
-static const MLoopTri *emDM_getLoopTriArray(DerivedMesh *dm)
-{
-	if (dm->looptris.array) {
-		BLI_assert(poly_to_tri_count(dm->numPolyData, dm->numLoopData) == dm->looptris.num);
-	}
-	else {
-		dm->recalcLoopTri(dm);
-	}
 
-	return dm->looptris.array;
+	BLI_assert(dm->looptris.array == NULL);
+	atomic_cas_ptr((void **)&dm->looptris.array, dm->looptris.array, dm->looptris.array_wip);
+	dm->looptris.array_wip = NULL;
 }
 
 static void emDM_foreachMappedVert(
@@ -1639,8 +1634,6 @@ DerivedMesh *getEditDerivedBMesh(
 	bmdm->dm.getNumLoops = emDM_getNumLoops;
 	bmdm->dm.getNumPolys = emDM_getNumPolys;
 
-	bmdm->dm.getLoopTriArray = emDM_getLoopTriArray;
-
 	bmdm->dm.getVert = emDM_getVert;
 	bmdm->dm.getVertCo = emDM_getVertCo;
 	bmdm->dm.getVertNo = emDM_getVertNo;
@@ -2018,7 +2011,7 @@ static void statvis_calc_distort(
 					              vertexCos[BM_elem_index_get(l_iter->next->v)]);
 				}
 				else {
-					BM_loop_calc_face_normal(l_iter, no_corner);
+					BM_loop_calc_face_normal_safe(l_iter, no_corner);
 				}
 				/* simple way to detect (what is most likely) concave */
 				if (dot_v3v3(f_no, no_corner) < 0.0f) {
@@ -2183,14 +2176,14 @@ static void cage_mapped_verts_callback(
 	}
 }
 
-float (*BKE_editmesh_vertexCos_get(BMEditMesh *em, Scene *scene, int *r_numVerts))[3]
+float (*BKE_editmesh_vertexCos_get(const struct EvaluationContext *eval_ctx, BMEditMesh *em, Scene *scene, int *r_numVerts))[3]
 {
 	DerivedMesh *cage, *final;
 	BLI_bitmap *visit_bitmap;
 	struct CageUserData data;
 	float (*cos_cage)[3];
 
-	cage = editbmesh_get_derived_cage_and_final(scene, em->ob, em, CD_MASK_BAREMESH, &final);
+	cage = editbmesh_get_derived_cage_and_final(eval_ctx, scene, em->ob, em, CD_MASK_BAREMESH, &final);
 	cos_cage = MEM_callocN(sizeof(*cos_cage) * em->bm->totvert, "bmbvh cos_cage");
 
 	/* when initializing cage verts, we only want the first cage coordinate for each vertex,
diff --git a/source/blender/blenkernel/intern/editmesh_tangent.c b/source/blender/blenkernel/intern/editmesh_tangent.c
index b04fc753f7a..f725a1793b4 100644
--- a/source/blender/blenkernel/intern/editmesh_tangent.c
+++ b/source/blender/blenkernel/intern/editmesh_tangent.c
@@ -283,33 +283,36 @@ void BKE_editmesh_loop_tangent_calc(
         /* result */
         CustomData *loopdata_out,
         const uint  loopdata_out_len,
-        char *tangent_mask_curr_p)
+        short *tangent_mask_curr_p)
 {
 	BMesh *bm = em->bm;
 
-	BLI_assert(CustomData_number_of_layers(&bm->ldata, CD_MLOOPUV) != 0);
-
 	int act_uv_n = -1;
 	int ren_uv_n = -1;
 	bool calc_act = false;
 	bool calc_ren = false;
 	char act_uv_name[MAX_NAME];
 	char ren_uv_name[MAX_NAME];
-	char tangent_mask = 0;
-	char tangent_mask_curr = *tangent_mask_curr_p;
+	short tangent_mask = 0;
+	short tangent_mask_curr = *tangent_mask_curr_p;
 
 	BKE_mesh_calc_loop_tangent_step_0(
 	        &bm->ldata, calc_active_tangent, tangent_names, tangent_names_len,
 	        &calc_act, &calc_ren, &act_uv_n, &ren_uv_n, act_uv_name, ren_uv_name, &tangent_mask);
 
 	if ((tangent_mask_curr | tangent_mask) != tangent_mask_curr) {
-		for (int i = 0; i < tangent_names_len; i++)
-			if (tangent_names[i][0])
-				BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, loopdata_out_len, tangent_names[i]);
+		for (int i = 0; i < tangent_names_len; i++) {
+			if (tangent_names[i][0]) {
+				BKE_mesh_add_loop_tangent_named_layer_for_uv(
+				        &bm->ldata, loopdata_out, (int)loopdata_out_len, tangent_names[i]);
+			}
+		}
+		if ((tangent_mask & DM_TANGENT_MASK_ORCO) && CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, "") == -1)
+			CustomData_add_layer_named(loopdata_out, CD_TANGENT, CD_CALLOC, NULL, (int)loopdata_out_len, "");
 		if (calc_act && act_uv_name[0])
-			BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, loopdata_out_len, act_uv_name);
+			BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, (int)loopdata_out_len, act_uv_name);
 		if (calc_ren && ren_uv_name[0])
-			BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, loopdata_out_len, ren_uv_name);
+			BKE_mesh_add_loop_tangent_named_layer_for_uv(&bm->ldata, loopdata_out, (int)loopdata_out_len, ren_uv_name);
 		int totface = em->tottri;
 #ifdef USE_LOOPTRI_DETECT_QUADS
 		int num_face_as_quad_map;
@@ -336,7 +339,7 @@ void BKE_editmesh_loop_tangent_calc(
 		}
 #endif
 		/* Calculation */
-		{
+		if (em->tottri != 0) {
 			TaskScheduler *scheduler = BLI_task_scheduler_get();
 			TaskPool *task_pool;
 			task_pool = BLI_task_pool_create(scheduler, NULL);
@@ -372,6 +375,15 @@ void BKE_editmesh_loop_tangent_calc(
 						continue;
 					/* needed for orco lookups */
 					htype_index |= BM_VERT;
+					tangent_mask_curr |= DM_TANGENT_MASK_ORCO;
+				}
+				else {
+					/* Fill the resulting tangent_mask */
+					int uv_ind = CustomData_get_named_layer_index(&bm->ldata, CD_MLOOPUV, loopdata_out->layers[index].name);
+					int uv_start = CustomData_get_layer_index(&bm->ldata, CD_MLOOPUV);
+					BLI_assert(uv_ind != -1 && uv_start != -1);
+					BLI_assert(uv_ind - uv_start < MAX_MTFACE);
+					tangent_mask_curr |= 1 << (uv_ind - uv_start);
 				}
 				if (mesh2tangent->precomputedFaceNormals) {
 					/* needed for face normal lookups */
@@ -382,13 +394,6 @@ void BKE_editmesh_loop_tangent_calc(
 				mesh2tangent->looptris = (const BMLoop *(*)[3])em->looptris;
 				mesh2tangent->tangent = loopdata_out->layers[index].data;
 
-				/* Fill the resulting tangent_mask */
-				int uv_ind = CustomData_get_named_layer_index(
-				        &bm->ldata, CD_MLOOPUV, loopdata_out->layers[index].name);
-				int uv_start = CustomData_get_layer_index(&bm->ldata, CD_MLOOPUV);
-				BLI_assert(uv_ind != -1 && uv_start != -1);
-				BLI_assert(uv_ind - uv_start < MAX_MTFACE);
-				tangent_mask_curr |= 1 << (uv_ind - uv_start);
 				BLI_task_pool_push(task_pool, emDM_calc_loop_tangents_thread, mesh2tangent, false, TASK_PRIORITY_LOW);
 			}
 
@@ -396,6 +401,9 @@ void BKE_editmesh_loop_tangent_calc(
 			BLI_task_pool_work_and_wait(task_pool);
 			BLI_task_pool_free(task_pool);
 		}
+		else {
+			tangent_mask_curr = tangent_mask;
+		}
 #ifdef USE_LOOPTRI_DETECT_QUADS
 		if (face_as_quad_map) {
 			MEM_freeN(face_as_quad_map);
@@ -406,15 +414,18 @@ void BKE_editmesh_loop_tangent_calc(
 
 	*tangent_mask_curr_p = tangent_mask_curr;
 
-	/* Update active layer index */
-	int uv_index = CustomData_get_layer_index_n(&bm->ldata, CD_MLOOPUV, act_uv_n);
-	int tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, bm->ldata.layers[uv_index].name);
-	CustomData_set_layer_active_index(loopdata_out, CD_TANGENT, tan_index);
+	int act_uv_index = CustomData_get_layer_index_n(&bm->ldata, CD_MLOOPUV, act_uv_n);
+	if (act_uv_index >= 0) {
+		int tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, bm->ldata.layers[act_uv_index].name);
+		CustomData_set_layer_active_index(loopdata_out, CD_TANGENT, tan_index);
+	} /* else tangent has been built from orco */
 
 	/* Update render layer index */
-	uv_index = CustomData_get_layer_index_n(&bm->ldata, CD_MLOOPUV, ren_uv_n);
-	tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, bm->ldata.layers[uv_index].name);
-	CustomData_set_layer_render_index(loopdata_out, CD_TANGENT, tan_index);
+	int ren_uv_index = CustomData_get_layer_index_n(&bm->ldata, CD_MLOOPUV, ren_uv_n);
+	if (ren_uv_index >= 0) {
+		int tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, bm->ldata.layers[ren_uv_index].name);
+		CustomData_set_layer_render_index(loopdata_out, CD_TANGENT, tan_index);
+	} /* else tangent has been built from orco */
 }
 
 /** \} */
\ No newline at end of file
diff --git a/source/blender/blenkernel/intern/effect.c b/source/blender/blenkernel/intern/effect.c
index 2213094cd0b..36f7f6d604e 100644
--- a/source/blender/blenkernel/intern/effect.c
+++ b/source/blender/blenkernel/intern/effect.c
@@ -72,6 +72,7 @@
 #include "BKE_scene.h"
 #include "BKE_smoke.h"
 
+#include "DEG_depsgraph.h"
 
 #include "RE_render_ext.h"
 #include "RE_shader_ext.h"
@@ -146,9 +147,10 @@ void free_partdeflect(PartDeflect *pd)
 	MEM_freeN(pd);
 }
 
-static EffectorCache *new_effector_cache(Scene *scene, Object *ob, ParticleSystem *psys, PartDeflect *pd)
+static EffectorCache *new_effector_cache(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, ParticleSystem *psys, PartDeflect *pd)
 {
 	EffectorCache *eff = MEM_callocN(sizeof(EffectorCache), "EffectorCache");
+	eff->eval_ctx = eval_ctx;
 	eff->scene = scene;
 	eff->ob = ob;
 	eff->psys = psys;
@@ -156,7 +158,7 @@ static EffectorCache *new_effector_cache(Scene *scene, Object *ob, ParticleSyste
 	eff->frame = -1;
 	return eff;
 }
-static void add_object_to_effectors(ListBase **effectors, Scene *scene, EffectorWeights *weights, Object *ob, Object *ob_src, bool for_simulation)
+static void add_object_to_effectors(ListBase **effectors, const struct EvaluationContext *eval_ctx, Scene *scene, EffectorWeights *weights, Object *ob, Object *ob_src, bool for_simulation)
 {
 	EffectorCache *eff = NULL;
 
@@ -174,14 +176,14 @@ static void add_object_to_effectors(ListBase **effectors, Scene *scene, Effector
 	if (*effectors == NULL)
 		*effectors = MEM_callocN(sizeof(ListBase), "effectors list");
 
-	eff = new_effector_cache(scene, ob, NULL, ob->pd);
+	eff = new_effector_cache(eval_ctx, scene, ob, NULL, ob->pd);
 
 	/* make sure imat is up to date */
 	invert_m4_m4(ob->imat, ob->obmat);
 
 	BLI_addtail(*effectors, eff);
 }
-static void add_particles_to_effectors(ListBase **effectors, Scene *scene, EffectorWeights *weights, Object *ob, ParticleSystem *psys, ParticleSystem *psys_src, bool for_simulation)
+static void add_particles_to_effectors(ListBase **effectors, const struct EvaluationContext *eval_ctx, Scene *scene, EffectorWeights *weights, Object *ob, ParticleSystem *psys, ParticleSystem *psys_src, bool for_simulation)
 {
 	ParticleSettings *part= psys->part;
 
@@ -195,25 +197,34 @@ static void add_particles_to_effectors(ListBase **effectors, Scene *scene, Effec
 		if (*effectors == NULL)
 			*effectors = MEM_callocN(sizeof(ListBase), "effectors list");
 
-		BLI_addtail(*effectors, new_effector_cache(scene, ob, psys, part->pd));
+		BLI_addtail(*effectors, new_effector_cache(eval_ctx, scene, ob, psys, part->pd));
 	}
 
 	if (part->pd2 && part->pd2->forcefield && (!for_simulation || weights->weight[part->pd2->forcefield] != 0.0f)) {
 		if (*effectors == NULL)
 			*effectors = MEM_callocN(sizeof(ListBase), "effectors list");
 
-		BLI_addtail(*effectors, new_effector_cache(scene, ob, psys, part->pd2));
+		BLI_addtail(*effectors, new_effector_cache(eval_ctx, scene, ob, psys, part->pd2));
 	}
 }
 
 /* returns ListBase handle with objects taking part in the effecting */
-ListBase *pdInitEffectors(Scene *scene, Object *ob_src, ParticleSystem *psys_src,
-                          EffectorWeights *weights, bool for_simulation)
+ListBase *pdInitEffectors(
+        const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob_src, ParticleSystem *psys_src,
+        EffectorWeights *weights, bool for_simulation)
 {
-	SceneLayer *sl = BKE_scene_layer_context_active(scene); /* Can't get sl from the calling modifiers yet */
+	SceneLayer *sl;
 	Base *base;
 	unsigned int layer= ob_src->lay;
 	ListBase *effectors = NULL;
+
+	/* eval_ctx is NULL during deg build */
+	if (eval_ctx) {
+		sl = eval_ctx->scene_layer;
+	}
+	else {
+		sl = BKE_scene_layer_context_active_PLACEHOLDER(scene);
+	}
 	
 	if (weights->group) {
 		GroupObject *go;
@@ -221,33 +232,33 @@ ListBase *pdInitEffectors(Scene *scene, Object *ob_src, ParticleSystem *psys_src
 		for (go= weights->group->gobject.first; go; go= go->next) {
 			if ( (go->ob->lay & layer) ) {
 				if ( go->ob->pd && go->ob->pd->forcefield )
-					add_object_to_effectors(&effectors, scene, weights, go->ob, ob_src, for_simulation);
+					add_object_to_effectors(&effectors, eval_ctx, scene, weights, go->ob, ob_src, for_simulation);
 
 				if ( go->ob->particlesystem.first ) {
 					ParticleSystem *psys= go->ob->particlesystem.first;
 
 					for ( ; psys; psys=psys->next )
-						add_particles_to_effectors(&effectors, scene, weights, go->ob, psys, psys_src, for_simulation);
+						add_particles_to_effectors(&effectors, eval_ctx, scene, weights, go->ob, psys, psys_src, for_simulation);
 				}
 			}
 		}
 	}
 	else {
-		for (base = FIRSTBASE_NEW; base; base = base->next) {
+		for (base = FIRSTBASE_NEW(sl); base; base = base->next) {
 			if ( base->object->pd && base->object->pd->forcefield )
-				add_object_to_effectors(&effectors, scene, weights, base->object, ob_src, for_simulation);
+				add_object_to_effectors(&effectors, eval_ctx, scene, weights, base->object, ob_src, for_simulation);
 
 			if ( base->object->particlesystem.first ) {
 				ParticleSystem *psys= base->object->particlesystem.first;
 
 				for ( ; psys; psys=psys->next )
-					add_particles_to_effectors(&effectors, scene, weights, base->object, psys, psys_src, for_simulation);
+					add_particles_to_effectors(&effectors, eval_ctx, scene, weights, base->object, psys, psys_src, for_simulation);
 			}
 		}
 	}
 	
 	if (for_simulation)
-		pdPrecalculateEffectors(effectors);
+		pdPrecalculateEffectors(eval_ctx, effectors);
 	
 	return effectors;
 }
@@ -268,7 +279,7 @@ void pdEndEffectors(ListBase **effectors)
 	}
 }
 
-static void precalculate_effector(EffectorCache *eff)
+static void precalculate_effector(const struct EvaluationContext *eval_ctx, EffectorCache *eff)
 {
 	unsigned int cfra = (unsigned int)(eff->scene->r.cfra >= 0 ? eff->scene->r.cfra : -eff->scene->r.cfra);
 	if (!eff->pd->rng)
@@ -280,7 +291,7 @@ static void precalculate_effector(EffectorCache *eff)
 		Curve *cu= eff->ob->data;
 		if (cu->flag & CU_PATH) {
 			if (eff->ob->curve_cache == NULL || eff->ob->curve_cache->path==NULL || eff->ob->curve_cache->path->data==NULL)
-				BKE_displist_make_curveTypes(eff->scene, eff->ob, 0);
+				BKE_displist_make_curveTypes(eval_ctx, eff->scene, eff->ob, 0);
 
 			if (eff->ob->curve_cache->path && eff->ob->curve_cache->path->data) {
 				where_on_path(eff->ob, 0.0, eff->guide_loc, eff->guide_dir, NULL, &eff->guide_radius, NULL);
@@ -301,19 +312,19 @@ static void precalculate_effector(EffectorCache *eff)
 	if (eff->ob) {
 		float old_vel[3];
 
-		BKE_object_where_is_calc_time(eff->scene, eff->ob, cfra - 1.0f);
+		BKE_object_where_is_calc_time(eval_ctx, eff->scene, eff->ob, cfra - 1.0f);
 		copy_v3_v3(old_vel, eff->ob->obmat[3]);
-		BKE_object_where_is_calc_time(eff->scene, eff->ob, cfra);
+		BKE_object_where_is_calc_time(eval_ctx, eff->scene, eff->ob, cfra);
 		sub_v3_v3v3(eff->velocity, eff->ob->obmat[3], old_vel);
 	}
 }
 
-void pdPrecalculateEffectors(ListBase *effectors)
+void pdPrecalculateEffectors(const struct EvaluationContext *eval_ctx, ListBase *effectors)
 {
 	if (effectors) {
 		EffectorCache *eff = effectors->first;
 		for (; eff; eff=eff->next)
-			precalculate_effector(eff);
+			precalculate_effector(eval_ctx, eff);
 	}
 }
 
@@ -612,6 +623,7 @@ int get_effector_data(EffectorCache *eff, EffectorData *efd, EffectedPoint *poin
 		}
 		else {
 			ParticleSimulationData sim= {NULL};
+			sim.eval_ctx = eff->eval_ctx;
 			sim.scene= eff->scene;
 			sim.ob= eff->ob;
 			sim.psys= eff->psys;
diff --git a/source/blender/blenkernel/intern/fluidsim.c b/source/blender/blenkernel/intern/fluidsim.c
index 8247336d915..12b9abc6d03 100644
--- a/source/blender/blenkernel/intern/fluidsim.c
+++ b/source/blender/blenkernel/intern/fluidsim.c
@@ -65,7 +65,7 @@
 // file handling
 //-------------------------------------------------------------------------------
 
-void initElbeemMesh(struct Scene *scene, struct Object *ob,
+void initElbeemMesh(const struct EvaluationContext *eval_ctx, struct Scene *scene, struct Object *ob,
                     int *numVertices, float **vertices,
                     int *numTriangles, int **triangles,
                     int useGlobalCoords, int modifierIndex)
@@ -78,9 +78,7 @@ void initElbeemMesh(struct Scene *scene, struct Object *ob,
 	float *verts;
 	int *tris;
 
-	dm = mesh_create_derived_index_render(scene, ob, CD_MASK_BAREMESH, modifierIndex);
-
-	DM_ensure_looptri(dm);
+	dm = mesh_create_derived_index_render(eval_ctx, scene, ob, CD_MASK_BAREMESH, modifierIndex);
 
 	mvert = dm->getVertArray(dm);
 	mloop = dm->getLoopArray(dm);
diff --git a/source/blender/blenkernel/intern/font.c b/source/blender/blenkernel/intern/font.c
index 401fed74c52..d6b28cfaf70 100644
--- a/source/blender/blenkernel/intern/font.c
+++ b/source/blender/blenkernel/intern/font.c
@@ -106,6 +106,23 @@ void BKE_vfont_free(struct VFont *vf)
 	}
 }
 
+void BKE_vfont_copy_data(Main *UNUSED(bmain), VFont *vfont_dst, const VFont *UNUSED(vfont_src), const int flag)
+{
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
+
+	/* Just to be sure, should not have any value actually after reading time. */
+	vfont_dst->temp_pf = NULL;
+
+	if (vfont_dst->packedfile) {
+		vfont_dst->packedfile = dupPackedFile(vfont_dst->packedfile);
+	}
+
+	if (vfont_dst->data) {
+		vfont_dst->data = BLI_vfontdata_copy(vfont_dst->data, flag_subdata);
+	}
+}
+
 static void *builtin_font_data = NULL;
 static int builtin_font_size = 0;
 
@@ -249,7 +266,7 @@ VFont *BKE_vfont_load(Main *bmain, const char *filepath)
 
 		vfd = BLI_vfontdata_from_freetypefont(pf);
 		if (vfd) {
-			vfont = BKE_libblock_alloc(bmain, ID_VF, filename);
+			vfont = BKE_libblock_alloc(bmain, ID_VF, filename, 0);
 			vfont->data = vfd;
 
 			/* if there's a font name, use it for the ID name */
diff --git a/source/blender/blenkernel/intern/freestyle.c b/source/blender/blenkernel/intern/freestyle.c
index 0a0b023df82..e45a938a4fc 100644
--- a/source/blender/blenkernel/intern/freestyle.c
+++ b/source/blender/blenkernel/intern/freestyle.c
@@ -44,7 +44,7 @@
 
 // function declarations
 static FreestyleLineSet *alloc_lineset(void);
-static void copy_lineset(FreestyleLineSet *new_lineset, FreestyleLineSet *lineset);
+static void copy_lineset(FreestyleLineSet *new_lineset, FreestyleLineSet *lineset, const int flag);
 static FreestyleModuleConfig *alloc_module(void);
 static void copy_module(FreestyleModuleConfig *new_module, FreestyleModuleConfig *module);
 
@@ -79,7 +79,7 @@ void BKE_freestyle_config_free(FreestyleConfig *config)
 	BLI_freelistN(&config->modules);
 }
 
-void BKE_freestyle_config_copy(FreestyleConfig *new_config, FreestyleConfig *config)
+void BKE_freestyle_config_copy(FreestyleConfig *new_config, FreestyleConfig *config, const int flag)
 {
 	FreestyleLineSet *lineset, *new_lineset;
 	FreestyleModuleConfig *module, *new_module;
@@ -93,7 +93,7 @@ void BKE_freestyle_config_copy(FreestyleConfig *new_config, FreestyleConfig *con
 	BLI_listbase_clear(&new_config->linesets);
 	for (lineset = (FreestyleLineSet *)config->linesets.first; lineset; lineset = lineset->next) {
 		new_lineset = alloc_lineset();
-		copy_lineset(new_lineset, lineset);
+		copy_lineset(new_lineset, lineset, flag);
 		BLI_addtail(&new_config->linesets, (void *)new_lineset);
 	}
 
@@ -105,11 +105,9 @@ void BKE_freestyle_config_copy(FreestyleConfig *new_config, FreestyleConfig *con
 	}
 }
 
-static void copy_lineset(FreestyleLineSet *new_lineset, FreestyleLineSet *lineset)
+static void copy_lineset(FreestyleLineSet *new_lineset, FreestyleLineSet *lineset, const int flag)
 {
 	new_lineset->linestyle = lineset->linestyle;
-	if (new_lineset->linestyle)
-		id_us_plus(&new_lineset->linestyle->id);
 	new_lineset->flags = lineset->flags;
 	new_lineset->selection = lineset->selection;
 	new_lineset->qi = lineset->qi;
@@ -118,10 +116,12 @@ static void copy_lineset(FreestyleLineSet *new_lineset, FreestyleLineSet *linese
 	new_lineset->edge_types = lineset->edge_types;
 	new_lineset->exclude_edge_types = lineset->exclude_edge_types;
 	new_lineset->group = lineset->group;
-	if (new_lineset->group) {
-		id_us_plus(&new_lineset->group->id);
-	}
 	strcpy(new_lineset->name, lineset->name);
+
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		id_us_plus((ID *)new_lineset->linestyle);
+		id_us_plus((ID *)new_lineset->group);
+	}
 }
 
 static FreestyleModuleConfig *alloc_module(void)
diff --git a/source/blender/blenkernel/intern/gpencil.c b/source/blender/blenkernel/intern/gpencil.c
index 758438bb051..ee0d0b41898 100644
--- a/source/blender/blenkernel/intern/gpencil.c
+++ b/source/blender/blenkernel/intern/gpencil.c
@@ -627,7 +627,7 @@ bGPdata *BKE_gpencil_data_addnew(const char name[])
 	bGPdata *gpd;
 	
 	/* allocate memory for a new block */
-	gpd = BKE_libblock_alloc(G.main, ID_GD, name);
+	gpd = BKE_libblock_alloc(G.main, ID_GD, name, 0);
 	
 	/* initial settings */
 	gpd->flag = (GP_DATA_DISPINFO | GP_DATA_EXPAND);
@@ -753,47 +753,62 @@ bGPDlayer *BKE_gpencil_layer_duplicate(const bGPDlayer *gpl_src)
 	return gpl_dst;
 }
 
-/* make a copy of a given gpencil datablock */
-bGPdata *BKE_gpencil_data_duplicate(Main *bmain, const bGPdata *gpd_src, bool internal_copy)
+/**
+ * Only copy internal data of GreasePencil ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_gpencil_copy_data(Main *UNUSED(bmain), bGPdata *gpd_dst, const bGPdata *gpd_src, const int UNUSED(flag))
 {
-	const bGPDlayer *gpl_src;
-	bGPDlayer *gpl_dst;
-	bGPdata *gpd_dst;
+	/* copy layers */
+	BLI_listbase_clear(&gpd_dst->layers);
+	for (const bGPDlayer *gpl_src = gpd_src->layers.first; gpl_src; gpl_src = gpl_src->next) {
+		/* make a copy of source layer and its data */
+		bGPDlayer *gpl_dst = BKE_gpencil_layer_duplicate(gpl_src);  /* TODO here too could add unused flags... */
+		BLI_addtail(&gpd_dst->layers, gpl_dst);
+	}
 
-	/* error checking */
-	if (gpd_src == NULL) {
-		return NULL;
+	/* copy palettes */
+	BLI_listbase_clear(&gpd_dst->palettes);
+	for (const bGPDpalette *palette_src = gpd_src->palettes.first; palette_src; palette_src = palette_src->next) {
+		bGPDpalette *palette_dst = BKE_gpencil_palette_duplicate(palette_src);  /* TODO here too could add unused flags... */
+		BLI_addtail(&gpd_dst->palettes, palette_dst);
 	}
-	
-	/* make a copy of the base-data */
+}
+
+/* make a copy of a given gpencil datablock */
+bGPdata *BKE_gpencil_data_duplicate(Main *bmain, const bGPdata *gpd_src, bool internal_copy)
+{
+	/* Yuck and super-uber-hyper yuck!!!
+	 * Should be replaceable with a no-main copy (LIB_ID_COPY_NO_MAIN etc.), but not sure about it,
+	 * so for now keep old code for that one. */
 	if (internal_copy) {
+		const bGPDlayer *gpl_src;
+		bGPDlayer *gpl_dst;
+		bGPdata *gpd_dst;
+
 		/* make a straight copy for undo buffers used during stroke drawing */
 		gpd_dst = MEM_dupallocN(gpd_src);
+
+		/* copy layers */
+		BLI_listbase_clear(&gpd_dst->layers);
+		for (gpl_src = gpd_src->layers.first; gpl_src; gpl_src = gpl_src->next) {
+			/* make a copy of source layer and its data */
+			gpl_dst = BKE_gpencil_layer_duplicate(gpl_src);
+			BLI_addtail(&gpd_dst->layers, gpl_dst);
+		}
+
+		/* return new */
+		return gpd_dst;
 	}
 	else {
-		/* make a copy when others use this */
-		gpd_dst = BKE_libblock_copy(bmain, &gpd_src->id);
-	}
-	
-	/* copy layers */
-	BLI_listbase_clear(&gpd_dst->layers);
-	for (gpl_src = gpd_src->layers.first; gpl_src; gpl_src = gpl_src->next) {
-		/* make a copy of source layer and its data */
-		gpl_dst = BKE_gpencil_layer_duplicate(gpl_src);
-		BLI_addtail(&gpd_dst->layers, gpl_dst);
-	}
-	if (!internal_copy) {
-		/* copy palettes */
-		bGPDpalette *palette_src, *palette_dst;
-		BLI_listbase_clear(&gpd_dst->palettes);
-		for (palette_src = gpd_src->palettes.first; palette_src; palette_src = palette_src->next) {
-			palette_dst = BKE_gpencil_palette_duplicate(palette_src);
-			BLI_addtail(&gpd_dst->palettes, palette_dst);
-		}
+		bGPdata *gpd_copy;
+		BKE_id_copy_ex(bmain, &gpd_src->id, (ID **)&gpd_copy, 0, false);
+		return gpd_copy;
 	}
-	
-	/* return new */
-	return gpd_dst;
 }
 
 void BKE_gpencil_make_local(Main *bmain, bGPdata *gpd, const bool lib_local)
diff --git a/source/blender/blenkernel/intern/group.c b/source/blender/blenkernel/intern/group.c
index 94a341de366..5ccbe9f7054 100644
--- a/source/blender/blenkernel/intern/group.c
+++ b/source/blender/blenkernel/intern/group.c
@@ -77,7 +77,7 @@ Group *BKE_group_add(Main *bmain, const char *name)
 {
 	Group *group;
 	
-	group = BKE_libblock_alloc(bmain, ID_GR, name);
+	group = BKE_libblock_alloc(bmain, ID_GR, name, 0);
 	id_us_min(&group->id);
 	id_us_ensure_real(&group->id);
 	group->layer = (1 << 20) - 1;
@@ -87,19 +87,32 @@ Group *BKE_group_add(Main *bmain, const char *name)
 	return group;
 }
 
-Group *BKE_group_copy(Main *bmain, const Group *group)
+/**
+ * Only copy internal data of Group ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_group_copy_data(Main *UNUSED(bmain), Group *group_dst, const Group *group_src, const int flag)
 {
-	Group *groupn;
-
-	groupn = BKE_libblock_copy(bmain, &group->id);
-	BLI_duplicatelist(&groupn->gobject, &group->gobject);
+	BLI_duplicatelist(&group_dst->gobject, &group_src->gobject);
 
 	/* Do not copy group's preview (same behavior as for objects). */
-	groupn->preview = NULL;
-
-	BKE_id_copy_ensure_local(bmain, &group->id, &groupn->id);
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0 && false) {  /* XXX TODO temp hack */
+		BKE_previewimg_id_copy(&group_dst->id, &group_src->id);
+	}
+	else {
+		group_dst->preview = NULL;
+	}
+}
 
-	return groupn;
+Group *BKE_group_copy(Main *bmain, const Group *group)
+{
+	Group *group_copy;
+	BKE_id_copy_ex(bmain, &group->id, (ID **)&group_copy, 0, false);
+	return group_copy;
 }
 
 void BKE_group_make_local(Main *bmain, Group *group, const bool lib_local)
@@ -314,7 +327,7 @@ static void group_replaces_nla(Object *parent, Object *target, char mode)
  * you can draw everything, leaves tags in objects to signal it needs further updating */
 
 /* note: does not work for derivedmesh and render... it recreates all again in convertblender.c */
-void BKE_group_handle_recalc_and_update(struct EvaluationContext *eval_ctx, Scene *scene, Object *UNUSED(parent), Group *group)
+void BKE_group_handle_recalc_and_update(const struct EvaluationContext *eval_ctx, Scene *scene, Object *UNUSED(parent), Group *group)
 {
 	GroupObject *go;
 	
diff --git a/source/blender/blenkernel/intern/icons.c b/source/blender/blenkernel/intern/icons.c
index db50a04348b..a407fd0bae8 100644
--- a/source/blender/blenkernel/intern/icons.c
+++ b/source/blender/blenkernel/intern/icons.c
@@ -255,6 +255,8 @@ PreviewImage **BKE_previewimg_id_get_p(const ID *id)
 		ID_PRV_CASE(ID_SCE, Scene);
 		ID_PRV_CASE(ID_SCR, bScreen);
 #undef ID_PRV_CASE
+		default:
+			break;
 	}
 
 	return NULL;
diff --git a/source/blender/blenkernel/intern/idprop.c b/source/blender/blenkernel/intern/idprop.c
index a3bd15252cb..b00a62a1a87 100644
--- a/source/blender/blenkernel/intern/idprop.c
+++ b/source/blender/blenkernel/intern/idprop.c
@@ -90,7 +90,7 @@ IDProperty *IDP_NewIDPArray(const char *name)
 	return prop;
 }
 
-IDProperty *IDP_CopyIDPArray(const IDProperty *array)
+IDProperty *IDP_CopyIDPArray(const IDProperty *array, const int flag)
 {
 	/* don't use MEM_dupallocN because this may be part of an array */
 	IDProperty *narray, *tmp;
@@ -109,7 +109,7 @@ IDProperty *IDP_CopyIDPArray(const IDProperty *array)
 		 * then free it.  this makes for more maintainable
 		 * code than simply reimplementing the copy functions
 		 * in this loop.*/
-		tmp = IDP_CopyProperty(GETPROP(narray, i));
+		tmp = IDP_CopyProperty_ex(GETPROP(narray, i), flag);
 		memcpy(GETPROP(narray, i), tmp, sizeof(IDProperty));
 		MEM_freeN(tmp);
 	}
@@ -285,9 +285,9 @@ void IDP_FreeArray(IDProperty *prop)
 }
 
 
-static IDProperty *idp_generic_copy(const IDProperty *prop)
+static IDProperty *idp_generic_copy(const IDProperty *prop, const int UNUSED(flag))
 {
-	IDProperty *newp = MEM_callocN(sizeof(IDProperty), "IDProperty array dup");
+	IDProperty *newp = MEM_callocN(sizeof(IDProperty), __func__);
 
 	BLI_strncpy(newp->name, prop->name, MAX_IDPROP_NAME);
 	newp->type = prop->type;
@@ -298,9 +298,9 @@ static IDProperty *idp_generic_copy(const IDProperty *prop)
 	return newp;
 }
 
-static IDProperty *IDP_CopyArray(const IDProperty *prop)
+static IDProperty *IDP_CopyArray(const IDProperty *prop, const int flag)
 {
-	IDProperty *newp = idp_generic_copy(prop);
+	IDProperty *newp = idp_generic_copy(prop, flag);
 
 	if (prop->data.pointer) {
 		newp->data.pointer = MEM_dupallocN(prop->data.pointer);
@@ -310,7 +310,7 @@ static IDProperty *IDP_CopyArray(const IDProperty *prop)
 			int a;
 
 			for (a = 0; a < prop->len; a++)
-				array[a] = IDP_CopyProperty(array[a]);
+				array[a] = IDP_CopyProperty_ex(array[a], flag);
 		}
 	}
 	newp->len = prop->len;
@@ -363,12 +363,12 @@ IDProperty *IDP_NewString(const char *st, const char *name, int maxlen)
 	return prop;
 }
 
-static IDProperty *IDP_CopyString(const IDProperty *prop)
+static IDProperty *IDP_CopyString(const IDProperty *prop, const int flag)
 {
 	IDProperty *newp;
 
 	BLI_assert(prop->type == IDP_STRING);
-	newp = idp_generic_copy(prop);
+	newp = idp_generic_copy(prop, flag);
 
 	if (prop->data.pointer)
 		newp->data.pointer = MEM_dupallocN(prop->data.pointer);
@@ -442,15 +442,17 @@ void IDP_FreeString(IDProperty *prop)
 /** \name IDProperty ID API
  * \{ */
 
-static IDProperty *IDP_CopyID(const IDProperty *prop)
+static IDProperty *IDP_CopyID(const IDProperty *prop, const int flag)
 {
 	IDProperty *newp;
 
 	BLI_assert(prop->type == IDP_ID);
-	newp = idp_generic_copy(prop);
+	newp = idp_generic_copy(prop, flag);
 
 	newp->data.pointer = prop->data.pointer;
-	id_us_plus(IDP_Id(newp));
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		id_us_plus(IDP_Id(newp));
+	}
 
 	return newp;
 }
@@ -467,17 +469,17 @@ static IDProperty *IDP_CopyID(const IDProperty *prop)
 /**
  * Checks if a property with the same name as prop exists, and if so replaces it.
  */
-static IDProperty *IDP_CopyGroup(const IDProperty *prop)
+static IDProperty *IDP_CopyGroup(const IDProperty *prop, const int flag)
 {
 	IDProperty *newp, *link;
 	
 	BLI_assert(prop->type == IDP_GROUP);
-	newp = idp_generic_copy(prop);
+	newp = idp_generic_copy(prop, flag);
 	newp->len = prop->len;
 	newp->subtype = prop->subtype;
 
 	for (link = prop->data.group.first; link; link = link->next) {
-		BLI_addtail(&newp->data.group, IDP_CopyProperty(link));
+		BLI_addtail(&newp->data.group, IDP_CopyProperty_ex(link, flag));
 	}
 
 	return newp;
@@ -603,7 +605,7 @@ void IDP_ReplaceInGroup(IDProperty *group, IDProperty *prop)
  * If a property is missing in \a dest, add it.
  * Do it recursively.
  */
-void IDP_MergeGroup(IDProperty *dest, const IDProperty *src, const bool do_overwrite)
+void IDP_MergeGroup_ex(IDProperty *dest, const IDProperty *src, const bool do_overwrite, const int flag)
 {
 	IDProperty *prop;
 
@@ -616,12 +618,12 @@ void IDP_MergeGroup(IDProperty *dest, const IDProperty *src, const bool do_overw
 				IDProperty *prop_exist = IDP_GetPropertyFromGroup(dest, prop->name);
 
 				if (prop_exist != NULL) {
-					IDP_MergeGroup(prop_exist, prop, do_overwrite);
+					IDP_MergeGroup_ex(prop_exist, prop, do_overwrite, flag);
 					continue;
 				}
 			}
 
-			IDProperty *copy = IDP_CopyProperty(prop);
+			IDProperty *copy = IDP_CopyProperty_ex(prop, flag);
 			IDP_ReplaceInGroup(dest, copy);
 		}
 	}
@@ -630,12 +632,12 @@ void IDP_MergeGroup(IDProperty *dest, const IDProperty *src, const bool do_overw
 			IDProperty *prop_exist = IDP_GetPropertyFromGroup(dest, prop->name);
 			if (prop_exist != NULL) {
 				if (prop->type == IDP_GROUP) {
-					IDP_MergeGroup(prop_exist, prop, do_overwrite);
+					IDP_MergeGroup_ex(prop_exist, prop, do_overwrite, flag);
 					continue;
 				}
 			}
 			else {
-				IDProperty *copy = IDP_CopyProperty(prop);
+				IDProperty *copy = IDP_CopyProperty_ex(prop, flag);
 				dest->len++;
 				BLI_addtail(&dest->data.group, copy);
 			}
@@ -644,6 +646,15 @@ void IDP_MergeGroup(IDProperty *dest, const IDProperty *src, const bool do_overw
 }
 
 /**
+ * If a property is missing in \a dest, add it.
+ * Do it recursively.
+ */
+void IDP_MergeGroup(IDProperty *dest, const IDProperty *src, const bool do_overwrite)
+{
+	IDP_MergeGroup_ex(dest, src, do_overwrite, 0);
+}
+
+/**
  * This function has a sanity check to make sure ID properties with the same name don't
  * get added to the group.
  *
@@ -748,18 +759,23 @@ static void IDP_FreeGroup(IDProperty *prop, const bool do_id_user)
 
 /** \name IDProperty Main API
  * \{ */
-IDProperty *IDP_CopyProperty(const IDProperty *prop)
+IDProperty *IDP_CopyProperty_ex(const IDProperty *prop, const int flag)
 {
 	switch (prop->type) {
-		case IDP_GROUP: return IDP_CopyGroup(prop);
-		case IDP_STRING: return IDP_CopyString(prop);
-		case IDP_ID: return IDP_CopyID(prop);
-		case IDP_ARRAY: return IDP_CopyArray(prop);
-		case IDP_IDPARRAY: return IDP_CopyIDPArray(prop);
-		default: return idp_generic_copy(prop);
+		case IDP_GROUP: return IDP_CopyGroup(prop, flag);
+		case IDP_STRING: return IDP_CopyString(prop, flag);
+		case IDP_ID: return IDP_CopyID(prop, flag);
+		case IDP_ARRAY: return IDP_CopyArray(prop, flag);
+		case IDP_IDPARRAY: return IDP_CopyIDPArray(prop, flag);
+		default: return idp_generic_copy(prop, flag);
 	}
 }
 
+IDProperty *IDP_CopyProperty(const IDProperty *prop)
+{
+	return IDP_CopyProperty_ex(prop, 0);
+}
+
 /* Updates ID pointers after an object has been copied */
 /* TODO Nuke this once its only user has been correctly converted to use generic ID management from BKE_library! */
 void IDP_RelinkProperty(struct IDProperty *prop)
diff --git a/source/blender/blenkernel/intern/image.c b/source/blender/blenkernel/intern/image.c
index 2915e9d715d..33a690b32c6 100644
--- a/source/blender/blenkernel/intern/image.c
+++ b/source/blender/blenkernel/intern/image.c
@@ -304,8 +304,11 @@ static void image_free_anims(Image *ima)
  * Simply free the image data from memory,
  * on display the image can load again (except for render buffers).
  */
-void BKE_image_free_buffers(Image *ima)
+void BKE_image_free_buffers_ex(Image *ima, bool do_lock)
 {
+	if (do_lock) {
+		BLI_spin_lock(&image_spin);
+	}
 	image_free_cached_frames(ima);
 
 	image_free_anims(ima);
@@ -324,6 +327,15 @@ void BKE_image_free_buffers(Image *ima)
 	}
 
 	ima->ok = IMA_OK;
+
+	if (do_lock) {
+		BLI_spin_unlock(&image_spin);
+	}
+}
+
+void BKE_image_free_buffers(Image *ima)
+{
+	BKE_image_free_buffers_ex(ima, false);
 }
 
 /** Free (or release) any data used by this image (does not free the image itself). */
@@ -383,7 +395,7 @@ static Image *image_alloc(Main *bmain, const char *name, short source, short typ
 {
 	Image *ima;
 
-	ima = BKE_libblock_alloc(bmain, ID_IM, name);
+	ima = BKE_libblock_alloc(bmain, ID_IM, name, 0);
 	if (ima) {
 		image_init(ima, source, type);
 	}
@@ -434,39 +446,53 @@ static void copy_image_packedfiles(ListBase *lb_dst, const ListBase *lb_src)
 	}
 }
 
-/* empty image block, of similar type and filename */
-Image *BKE_image_copy(Main *bmain, const Image *ima)
+/**
+ * Only copy internal data of Image ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_image_copy_data(Main *UNUSED(bmain), Image *ima_dst, const Image *ima_src, const int flag)
 {
-	Image *nima = image_alloc(bmain, ima->id.name + 2, ima->source, ima->type);
+	BKE_color_managed_colorspace_settings_copy(&ima_dst->colorspace_settings, &ima_src->colorspace_settings);
 
-	BLI_strncpy(nima->name, ima->name, sizeof(ima->name));
+	copy_image_packedfiles(&ima_dst->packedfiles, &ima_src->packedfiles);
 
-	nima->flag = ima->flag;
-	nima->tpageflag = ima->tpageflag;
+	ima_dst->stereo3d_format = MEM_dupallocN(ima_src->stereo3d_format);
+	BLI_duplicatelist(&ima_dst->views, &ima_src->views);
 
-	nima->gen_x = ima->gen_x;
-	nima->gen_y = ima->gen_y;
-	nima->gen_type = ima->gen_type;
-	copy_v4_v4(nima->gen_color, ima->gen_color);
-
-	nima->animspeed = ima->animspeed;
-
-	nima->aspx = ima->aspx;
-	nima->aspy = ima->aspy;
-
-	BKE_color_managed_colorspace_settings_copy(&nima->colorspace_settings, &ima->colorspace_settings);
-
-	copy_image_packedfiles(&nima->packedfiles, &ima->packedfiles);
+	/* Cleanup stuff that cannot be copied. */
+	ima_dst->cache = NULL;
+	ima_dst->rr = NULL;
+	for (int i = 0; i < IMA_MAX_RENDER_SLOT; i++) {
+		ima_dst->renders[i] = NULL;
+	}
 
-	/* nima->stere3d_format is already allocated by image_alloc... */
-	*nima->stereo3d_format = *ima->stereo3d_format;
-	BLI_duplicatelist(&nima->views, &ima->views);
+	BLI_listbase_clear(&ima_dst->anims);
 
-	BKE_previewimg_id_copy(&nima->id, &ima->id);
+	ima_dst->totbind = 0;
+	for (int i = 0; i < TEXTARGET_COUNT; i++) {
+		ima_dst->bindcode[i] = 0;
+		ima_dst->gputexture[i] = NULL;
+	}
+	ima_dst->repbind = NULL;
 
-	BKE_id_copy_ensure_local(bmain, &ima->id, &nima->id);
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
+		BKE_previewimg_id_copy(&ima_dst->id, &ima_src->id);
+	}
+	else {
+		ima_dst->preview = NULL;
+	}
+}
 
-	return nima;
+/* empty image block, of similar type and filename */
+Image *BKE_image_copy(Main *bmain, const Image *ima)
+{
+	Image *ima_copy;
+	BKE_id_copy_ex(bmain, &ima->id, (ID **)&ima_copy, 0, false);
+	return ima_copy;
 }
 
 void BKE_image_make_local(Main *bmain, Image *ima, const bool lib_local)
@@ -1178,7 +1204,6 @@ bool BKE_imtype_is_movie(const char imtype)
 	switch (imtype) {
 		case R_IMF_IMTYPE_AVIRAW:
 		case R_IMF_IMTYPE_AVIJPEG:
-		case R_IMF_IMTYPE_QUICKTIME:
 		case R_IMF_IMTYPE_FFMPEG:
 		case R_IMF_IMTYPE_H264:
 		case R_IMF_IMTYPE_THEORA:
@@ -1250,7 +1275,6 @@ char BKE_imtype_valid_channels(const char imtype, bool write_file)
 		case R_IMF_IMTYPE_MULTILAYER:
 		case R_IMF_IMTYPE_DDS:
 		case R_IMF_IMTYPE_JP2:
-		case R_IMF_IMTYPE_QUICKTIME:
 		case R_IMF_IMTYPE_DPX:
 			chan_flag |= IMA_CHAN_FLAG_ALPHA;
 			break;
@@ -1313,7 +1337,6 @@ char BKE_imtype_from_arg(const char *imtype_arg)
 	else if (STREQ(imtype_arg, "AVIRAW")) return R_IMF_IMTYPE_AVIRAW;
 	else if (STREQ(imtype_arg, "AVIJPEG")) return R_IMF_IMTYPE_AVIJPEG;
 	else if (STREQ(imtype_arg, "PNG")) return R_IMF_IMTYPE_PNG;
-	else if (STREQ(imtype_arg, "QUICKTIME")) return R_IMF_IMTYPE_QUICKTIME;
 	else if (STREQ(imtype_arg, "BMP")) return R_IMF_IMTYPE_BMP;
 #ifdef WITH_HDR
 	else if (STREQ(imtype_arg, "HDR")) return R_IMF_IMTYPE_RADHDR;
@@ -1424,7 +1447,7 @@ static bool do_add_image_extension(char *string, const char imtype, const ImageF
 		}
 	}
 #endif
-	else { //   R_IMF_IMTYPE_AVIRAW, R_IMF_IMTYPE_AVIJPEG, R_IMF_IMTYPE_JPEG90, R_IMF_IMTYPE_QUICKTIME etc
+	else { //   R_IMF_IMTYPE_AVIRAW, R_IMF_IMTYPE_AVIJPEG, R_IMF_IMTYPE_JPEG90 etc
 		if (!(BLI_testextensie_n(string, extension_test = ".jpg", ".jpeg", NULL)))
 			extension = extension_test;
 	}
@@ -1432,9 +1455,7 @@ static bool do_add_image_extension(char *string, const char imtype, const ImageF
 	if (extension) {
 		/* prefer this in many cases to avoid .png.tga, but in certain cases it breaks */
 		/* remove any other known image extension */
-		if (BLI_testextensie_array(string, imb_ext_image) ||
-		    (G.have_quicktime && BLI_testextensie_array(string, imb_ext_image_qt)))
-		{
+		if (BLI_testextensie_array(string, imb_ext_image)) {
 			return BLI_replace_extension(string, FILE_MAX, extension);
 		}
 		else {
@@ -1710,7 +1731,7 @@ static void stampdata(Scene *scene, Object *camera, StampData *stamp_data, int d
 	}
 
 	{
-		Render *re = RE_GetRender(scene->id.name);
+		Render *re = RE_GetSceneRender(scene);
 		RenderStats *stats = re ? RE_GetStats(re) : NULL;
 
 		if (stats && (scene->r.stamp & R_STAMP_RENDERTIME)) {
@@ -2905,7 +2926,7 @@ RenderResult *BKE_image_acquire_renderresult(Scene *scene, Image *ima)
 	}
 	else if (ima->type == IMA_TYPE_R_RESULT) {
 		if (ima->render_slot == ima->last_render_slot)
-			rr = RE_AcquireResultRead(RE_GetRender(scene->id.name));
+			rr = RE_AcquireResultRead(RE_GetSceneRender(scene));
 		else
 			rr = ima->renders[ima->render_slot];
 
@@ -2923,7 +2944,7 @@ void BKE_image_release_renderresult(Scene *scene, Image *ima)
 	}
 	else if (ima->type == IMA_TYPE_R_RESULT) {
 		if (ima->render_slot == ima->last_render_slot)
-			RE_ReleaseResult(RE_GetRender(scene->id.name));
+			RE_ReleaseResult(RE_GetSceneRender(scene));
 	}
 }
 
@@ -2943,7 +2964,7 @@ void BKE_image_backup_render(Scene *scene, Image *ima, bool free_current_slot)
 {
 	/* called right before rendering, ima->renders contains render
 	 * result pointers for everything but the current render */
-	Render *re = RE_GetRender(scene->id.name);
+	Render *re = RE_GetSceneRender(scene);
 	int slot = ima->render_slot, last = ima->last_render_slot;
 
 	if (slot != last) {
@@ -3668,7 +3689,7 @@ static ImBuf *image_get_render_result(Image *ima, ImageUser *iuser, void **r_loc
 	if (!r_lock)
 		return NULL;
 
-	re = RE_GetRender(iuser->scene->id.name);
+	re = RE_GetSceneRender(iuser->scene);
 
 	channels = 4;
 	layer = iuser->layer;
diff --git a/source/blender/blenkernel/intern/image_gen.c b/source/blender/blenkernel/intern/image_gen.c
index 2c8399adece..1f1f4c9d341 100644
--- a/source/blender/blenkernel/intern/image_gen.c
+++ b/source/blender/blenkernel/intern/image_gen.c
@@ -132,7 +132,7 @@ static void image_buf_fill_checker_slice(unsigned char *rect,
 	float hsv[3] = {0.0f, 0.9f, 0.9f};
 	float rgb[3];
 
-	float dark_linear_color, bright_linear_color;
+	float dark_linear_color = 0.0f, bright_linear_color = 0.0f;
 	if (rect_float != NULL) {
 		dark_linear_color = srgb_to_linearrgb(0.25f);
 		bright_linear_color = srgb_to_linearrgb(0.58f);
diff --git a/source/blender/blenkernel/intern/key.c b/source/blender/blenkernel/intern/key.c
index 98b251294ae..fd42556067e 100644
--- a/source/blender/blenkernel/intern/key.c
+++ b/source/blender/blenkernel/intern/key.c
@@ -107,7 +107,7 @@ Key *BKE_key_add(ID *id)    /* common function */
 	Key *key;
 	char *el;
 	
-	key = BKE_libblock_alloc(G.main, ID_KE, "Key");
+	key = BKE_libblock_alloc(G.main, ID_KE, "Key", 0);
 	
 	key->type = KEY_NORMAL;
 	key->from = id;
@@ -146,36 +146,48 @@ Key *BKE_key_add(ID *id)    /* common function */
 			key->elemsize = 16;
 
 			break;
+
+		default:
+			break;
 	}
 	
 	return key;
 }
 
-Key *BKE_key_copy(Main *bmain, const Key *key)
+/**
+ * Only copy internal data of ShapeKey ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_key_copy_data(Main *UNUSED(bmain), Key *key_dst, const Key *key_src, const int UNUSED(flag))
 {
-	Key *keyn;
-	KeyBlock *kbn, *kb;
-	
-	keyn = BKE_libblock_copy(bmain, &key->id);
-	
-	BLI_duplicatelist(&keyn->block, &key->block);
-	
-	kb = key->block.first;
-	kbn = keyn->block.first;
-	while (kbn) {
-		
-		if (kbn->data) kbn->data = MEM_dupallocN(kbn->data);
-		if (kb == key->refkey) keyn->refkey = kbn;
-		
-		kbn = kbn->next;
-		kb = kb->next;
-	}
+	BLI_duplicatelist(&key_dst->block, &key_src->block);
 
-	BKE_id_copy_ensure_local(bmain, &key->id, &keyn->id);
+	KeyBlock *kb_dst, *kb_src;
+	for (kb_src = key_src->block.first, kb_dst = key_dst->block.first;
+	     kb_dst;
+	     kb_src = kb_src->next, kb_dst = kb_dst->next)
+	{
+		if (kb_dst->data) {
+			kb_dst->data = MEM_dupallocN(kb_dst->data);
+		}
+		if (kb_src == key_src->refkey) {
+			key_dst->refkey = kb_dst;
+		}
+	}
+}
 
-	return keyn;
+Key *BKE_key_copy(Main *bmain, const Key *key)
+{
+	Key *key_copy;
+	BKE_id_copy_ex(bmain, &key->id, (ID **)&key_copy, 0, false);
+	return key_copy;
 }
 
+/* XXX TODO get rid of this! */
 Key *BKE_key_copy_nolib(Key *key)
 {
 	Key *keyn;
@@ -1397,6 +1409,8 @@ Key **BKE_key_from_id_p(ID *id)
 			Lattice *lt = (Lattice *)id;
 			return &lt->key;
 		}
+		default:
+			break;
 	}
 
 	return NULL;
diff --git a/source/blender/blenkernel/intern/lamp.c b/source/blender/blenkernel/intern/lamp.c
index 4a3a1c50195..3d0d5f87f15 100644
--- a/source/blender/blenkernel/intern/lamp.c
+++ b/source/blender/blenkernel/intern/lamp.c
@@ -69,7 +69,7 @@ void BKE_lamp_init(Lamp *la)
 	la->bufsize = 512;
 	la->clipsta = 0.5f;
 	la->clipend = 40.0f;
-	la->bleedexp = 120.0f;
+	la->bleedexp = 2.5f;
 	la->samp = 3;
 	la->bias = 1.0f;
 	la->soft = 3.0f;
@@ -102,6 +102,14 @@ void BKE_lamp_init(Lamp *la)
 	la->sky_colorspace = BLI_XYZ_CIE;
 	la->sky_exposure = 1.0f;
 	la->shadow_frustum_size = 10.0f;
+	la->cascade_max_dist = 1000.0f;
+	la->cascade_count = 4;
+	la->cascade_exponent = 0.8f;
+	la->cascade_fade = 0.1f;
+	la->contact_dist = 1.0f;
+	la->contact_bias = 0.03f;
+	la->contact_spread = 0.2f;
+	la->contact_thickness = 0.5f;
 	
 	curvemapping_initialize(la->curfalloff);
 }
@@ -110,42 +118,60 @@ Lamp *BKE_lamp_add(Main *bmain, const char *name)
 {
 	Lamp *la;
 
-	la =  BKE_libblock_alloc(bmain, ID_LA, name);
+	la =  BKE_libblock_alloc(bmain, ID_LA, name, 0);
 
 	BKE_lamp_init(la);
 
 	return la;
 }
 
-Lamp *BKE_lamp_copy(Main *bmain, const Lamp *la)
+/**
+ * Only copy internal data of Lamp ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_lamp_copy_data(Main *bmain, Lamp *la_dst, const Lamp *la_src, const int flag)
 {
-	Lamp *lan;
-	int a;
-	
-	lan = BKE_libblock_copy(bmain, &la->id);
-
-	for (a = 0; a < MAX_MTEX; a++) {
-		if (lan->mtex[a]) {
-			lan->mtex[a] = MEM_mallocN(sizeof(MTex), "copylamptex");
-			memcpy(lan->mtex[a], la->mtex[a], sizeof(MTex));
-			id_us_plus((ID *)lan->mtex[a]->tex);
+	for (int a = 0; a < MAX_MTEX; a++) {
+		if (la_dst->mtex[a]) {
+			la_dst->mtex[a] = MEM_mallocN(sizeof(*la_dst->mtex[a]), __func__);
+			*la_dst->mtex[a] = *la_src->mtex[a];
 		}
 	}
-	
-	lan->curfalloff = curvemapping_copy(la->curfalloff);
 
-	if (la->nodetree)
-		lan->nodetree = ntreeCopyTree(bmain, la->nodetree);
+	la_dst->curfalloff = curvemapping_copy(la_src->curfalloff);
 
-	BKE_previewimg_id_copy(&lan->id, &la->id);
+	if (la_src->nodetree) {
+		BKE_id_copy_ex(bmain, (ID *)la_src->nodetree, (ID **)&la_dst->nodetree, flag, false);
+	}
 
-	BKE_id_copy_ensure_local(bmain, &la->id, &lan->id);
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
+		BKE_previewimg_id_copy(&la_dst->id, &la_src->id);
+	}
+	else {
+		la_dst->preview = NULL;
+	}
+}
 
-	return lan;
+Lamp *BKE_lamp_copy(Main *bmain, const Lamp *la)
+{
+	Lamp *la_copy;
+	BKE_id_copy_ex(bmain, &la->id, (ID **)&la_copy, 0, false);
+	return la_copy;
 }
 
 Lamp *localize_lamp(Lamp *la)
 {
+	/* TODO replace with something like
+	 * 	Lamp *la_copy;
+	 * 	BKE_id_copy_ex(bmain, &la->id, (ID **)&la_copy, LIB_ID_COPY_NO_MAIN | LIB_ID_COPY_NO_PREVIEW | LIB_ID_COPY_NO_USER_REFCOUNT, false);
+	 * 	return la_copy;
+	 *
+	 * ... Once f*** nodes are fully converted to that too :( */
+
 	Lamp *lan;
 	int a;
 	
diff --git a/source/blender/blenkernel/intern/lattice.c b/source/blender/blenkernel/intern/lattice.c
index c6773d98adf..0f26f53113f 100644
--- a/source/blender/blenkernel/intern/lattice.c
+++ b/source/blender/blenkernel/intern/lattice.c
@@ -269,39 +269,46 @@ Lattice *BKE_lattice_add(Main *bmain, const char *name)
 {
 	Lattice *lt;
 
-	lt = BKE_libblock_alloc(bmain, ID_LT, name);
+	lt = BKE_libblock_alloc(bmain, ID_LT, name, 0);
 
 	BKE_lattice_init(lt);
 
 	return lt;
 }
 
-Lattice *BKE_lattice_copy(Main *bmain, const Lattice *lt)
+/**
+ * Only copy internal data of Lattice ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_lattice_copy_data(Main *bmain, Lattice *lt_dst, const Lattice *lt_src, const int flag)
 {
-	Lattice *ltn;
+	lt_dst->def = MEM_dupallocN(lt_src->def);
 
-	ltn = BKE_libblock_copy(bmain, &lt->id);
-	ltn->def = MEM_dupallocN(lt->def);
-
-	if (lt->key) {
-		ltn->key = BKE_key_copy(bmain, ltn->key);
-		ltn->key->from = (ID *)ltn;
-	}
-	
-	if (lt->dvert) {
-		int tot = lt->pntsu * lt->pntsv * lt->pntsw;
-		ltn->dvert = MEM_mallocN(sizeof(MDeformVert) * tot, "Lattice MDeformVert");
-		BKE_defvert_array_copy(ltn->dvert, lt->dvert, tot);
+	if (lt_src->key) {
+		BKE_id_copy_ex(bmain, &lt_src->key->id, (ID **)&lt_dst->key, flag, false);
 	}
 
-	ltn->editlatt = NULL;
+	if (lt_src->dvert) {
+		int tot = lt_src->pntsu * lt_src->pntsv * lt_src->pntsw;
+		lt_dst->dvert = MEM_mallocN(sizeof(MDeformVert) * tot, "Lattice MDeformVert");
+		BKE_defvert_array_copy(lt_dst->dvert, lt_src->dvert, tot);
+	}
 
-	BKE_id_copy_ensure_local(bmain, &lt->id, &ltn->id);
+	lt_dst->editlatt = NULL;
+}
 
-	return ltn;
+Lattice *BKE_lattice_copy(Main *bmain, const Lattice *lt)
+{
+	Lattice *lt_copy;
+	BKE_id_copy_ex(bmain, &lt->id, (ID **)&lt_copy, 0, false);
+	return lt_copy;
 }
 
-/** Free (or release) any data used by this lattice (does not free the lattice itself). */
+	/** Free (or release) any data used by this lattice (does not free the lattice itself). */
 void BKE_lattice_free(Lattice *lt)
 {
 	BKE_animdata_free(&lt->id, false);
@@ -596,7 +603,7 @@ static bool where_on_path_deform(Object *ob, float ctime, float vec[4], float di
 /* co: local coord, result local too */
 /* returns quaternion for rotation, using cd->no_rot_axis */
 /* axis is using another define!!! */
-static bool calc_curve_deform(Scene *scene, Object *par, float co[3],
+static bool calc_curve_deform(const struct EvaluationContext *eval_ctx, Scene *scene, Object *par, float co[3],
                               const short axis, CurveDeform *cd, float r_quat[4])
 {
 	Curve *cu = par->data;
@@ -607,7 +614,7 @@ static bool calc_curve_deform(Scene *scene, Object *par, float co[3],
 	/* to be sure, mostly after file load, also cyclic dependencies */
 #ifdef CYCLIC_DEPENDENCY_WORKAROUND
 	if (par->curve_cache == NULL) {
-		BKE_displist_make_curveTypes(scene, par, false);
+		BKE_displist_make_curveTypes(eval_ctx, scene, par, false);
 	}
 #endif
 
@@ -700,7 +707,8 @@ static bool calc_curve_deform(Scene *scene, Object *par, float co[3],
 }
 
 void curve_deform_verts(
-        Scene *scene, Object *cuOb, Object *target, DerivedMesh *dm, float (*vertexCos)[3],
+        const struct EvaluationContext *eval_ctx, Scene *scene,
+        Object *cuOb, Object *target, DerivedMesh *dm, float (*vertexCos)[3],
         int numVerts, const char *vgroup, short defaxis)
 {
 	Curve *cu;
@@ -759,7 +767,7 @@ void curve_deform_verts(
 				if (weight > 0.0f) {
 					mul_m4_v3(cd.curvespace, vertexCos[a]);
 					copy_v3_v3(vec, vertexCos[a]);
-					calc_curve_deform(scene, cuOb, vec, defaxis, &cd, NULL);
+					calc_curve_deform(eval_ctx, scene, cuOb, vec, defaxis, &cd, NULL);
 					interp_v3_v3v3(vertexCos[a], vertexCos[a], vec, weight);
 					mul_m4_v3(cd.objectspace, vertexCos[a]);
 				}
@@ -782,7 +790,7 @@ void curve_deform_verts(
 				if (weight > 0.0f) {
 					/* already in 'cd.curvespace', prev for loop */
 					copy_v3_v3(vec, vertexCos[a]);
-					calc_curve_deform(scene, cuOb, vec, defaxis, &cd, NULL);
+					calc_curve_deform(eval_ctx, scene, cuOb, vec, defaxis, &cd, NULL);
 					interp_v3_v3v3(vertexCos[a], vertexCos[a], vec, weight);
 					mul_m4_v3(cd.objectspace, vertexCos[a]);
 				}
@@ -793,7 +801,7 @@ void curve_deform_verts(
 		if (cu->flag & CU_DEFORM_BOUNDS_OFF) {
 			for (a = 0; a < numVerts; a++) {
 				mul_m4_v3(cd.curvespace, vertexCos[a]);
-				calc_curve_deform(scene, cuOb, vertexCos[a], defaxis, &cd, NULL);
+				calc_curve_deform(eval_ctx, scene, cuOb, vertexCos[a], defaxis, &cd, NULL);
 				mul_m4_v3(cd.objectspace, vertexCos[a]);
 			}
 		}
@@ -808,7 +816,7 @@ void curve_deform_verts(
 	
 			for (a = 0; a < numVerts; a++) {
 				/* already in 'cd.curvespace', prev for loop */
-				calc_curve_deform(scene, cuOb, vertexCos[a], defaxis, &cd, NULL);
+				calc_curve_deform(eval_ctx, scene, cuOb, vertexCos[a], defaxis, &cd, NULL);
 				mul_m4_v3(cd.objectspace, vertexCos[a]);
 			}
 		}
@@ -818,7 +826,7 @@ void curve_deform_verts(
 /* input vec and orco = local coord in armature space */
 /* orco is original not-animated or deformed reference point */
 /* result written in vec and mat */
-void curve_deform_vector(Scene *scene, Object *cuOb, Object *target,
+void curve_deform_vector(const struct EvaluationContext *eval_ctx, Scene *scene, Object *cuOb, Object *target,
                          float orco[3], float vec[3], float mat[3][3], int no_rot_axis)
 {
 	CurveDeform cd;
@@ -837,7 +845,7 @@ void curve_deform_vector(Scene *scene, Object *cuOb, Object *target,
 
 	mul_m4_v3(cd.curvespace, vec);
 	
-	if (calc_curve_deform(scene, cuOb, vec, target->trackflag, &cd, quat)) {
+	if (calc_curve_deform(eval_ctx, scene, cuOb, vec, target->trackflag, &cd, quat)) {
 		float qmat[3][3];
 		
 		quat_to_mat3(qmat, quat);
@@ -1027,7 +1035,7 @@ void BKE_lattice_vertexcos_apply(struct Object *ob, float (*vertexCos)[3])
 	}
 }
 
-void BKE_lattice_modifiers_calc(Scene *scene, Object *ob)
+void BKE_lattice_modifiers_calc(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
 	Lattice *lt = ob->data;
 	VirtualModifierData virtualModifierData;
@@ -1054,7 +1062,7 @@ void BKE_lattice_modifiers_calc(Scene *scene, Object *ob)
 		if (mti->type != eModifierTypeType_OnlyDeform) continue;
 
 		if (!vertexCos) vertexCos = BKE_lattice_vertexcos_get(ob, &numVerts);
-		mti->deformVerts(md, ob, NULL, vertexCos, numVerts, 0);
+		mti->deformVerts(md, eval_ctx, ob, NULL, vertexCos, numVerts, 0);
 	}
 
 	/* always displist to make this work like derivedmesh */
@@ -1228,7 +1236,7 @@ void BKE_lattice_translate(Lattice *lt, float offset[3], bool do_keys)
 
 /* **** Depsgraph evaluation **** */
 
-void BKE_lattice_eval_geometry(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_lattice_eval_geometry(const struct EvaluationContext *UNUSED(eval_ctx),
                                Lattice *UNUSED(latt))
 {
 }
@@ -1248,4 +1256,4 @@ void BKE_lattice_batch_cache_free(Lattice *lt)
 	if (lt->batch_cache) {
 		BKE_lattice_batch_cache_free_cb(lt);
 	}
-}
\ No newline at end of file
+}
diff --git a/source/blender/blenkernel/intern/layer.c b/source/blender/blenkernel/intern/layer.c
index 78954e56f8c..f20b96b8bc7 100644
--- a/source/blender/blenkernel/intern/layer.c
+++ b/source/blender/blenkernel/intern/layer.c
@@ -57,6 +57,7 @@
 /* prototype */
 struct EngineSettingsCB_Type;
 static void layer_collection_free(SceneLayer *sl, LayerCollection *lc);
+static void layer_collection_objects_populate(SceneLayer *sl, LayerCollection *lc, ListBase *objects);
 static LayerCollection *layer_collection_add(SceneLayer *sl, LayerCollection *parent, SceneCollection *sc);
 static LayerCollection *find_layer_collection_by_scene_collection(LayerCollection *lc, const SceneCollection *sc);
 static IDProperty *collection_engine_settings_create(struct EngineSettingsCB_Type *ces_type, const bool populate);
@@ -69,9 +70,9 @@ static void object_bases_iterator_next(BLI_Iterator *iter, const int flag);
 
 /**
  * Returns the SceneLayer to be used for rendering
- * Most of the time BKE_scene_layer_context_active should be used instead
+ * Most of the time BKE_scene_layer_from_workspace_get should be used instead
  */
-SceneLayer *BKE_scene_layer_render_active(const Scene *scene)
+SceneLayer *BKE_scene_layer_from_scene_get(const Scene *scene)
 {
 	SceneLayer *sl = BLI_findlink(&scene->render_layers, scene->active_layer);
 	BLI_assert(sl);
@@ -81,23 +82,18 @@ SceneLayer *BKE_scene_layer_render_active(const Scene *scene)
 /**
  * Returns the SceneLayer to be used for drawing, outliner, and other context related areas.
  */
-SceneLayer *BKE_scene_layer_context_active_ex(const Main *bmain, const Scene *UNUSED(scene))
+SceneLayer *BKE_scene_layer_from_workspace_get(const struct WorkSpace *workspace)
 {
-	/* XXX We should really pass the workspace as argument, but would require
-	 * some bigger changes since it's often not available where we call this.
-	 * Just working around this by getting active window from WM for now */
-	for (wmWindowManager *wm = bmain->wm.first; wm; wm = wm->id.next) {
-		/* Called on startup, so 'winactive' may not be set, in that case fall back to first window. */
-		wmWindow *win = wm->winactive ? wm->winactive : wm->windows.first;
-		const WorkSpace *workspace = BKE_workspace_active_get(win->workspace_hook);
-		return BKE_workspace_render_layer_get(workspace);
-	}
-
-	return NULL;
+	return BKE_workspace_render_layer_get(workspace);
 }
-SceneLayer *BKE_scene_layer_context_active(const Scene *scene)
+
+/**
+ * This is a placeholder to know which areas of the code need to be addressed for the Workspace changes.
+ * Never use this, you should either use BKE_scene_layer_workspace_active or get SceneLayer explicitly.
+ */
+SceneLayer *BKE_scene_layer_context_active_PLACEHOLDER(const Scene *scene)
 {
-	return BKE_scene_layer_context_active_ex(G.main, scene);
+	return BKE_scene_layer_from_scene_get(scene);
 }
 
 /**
@@ -293,11 +289,7 @@ static Base *object_base_add(SceneLayer *sl, Object *ob)
 
 /* LayerCollection */
 
-/**
- * When freeing the entire SceneLayer at once we don't bother with unref
- * otherwise SceneLayer is passed to keep the syncing of the LayerCollection tree
- */
-static void layer_collection_free(SceneLayer *sl, LayerCollection *lc)
+static void layer_collection_objects_unpopulate(SceneLayer *sl, LayerCollection *lc)
 {
 	if (sl) {
 		for (LinkData *link = lc->object_bases.first; link; link = link->next) {
@@ -306,6 +298,15 @@ static void layer_collection_free(SceneLayer *sl, LayerCollection *lc)
 	}
 
 	BLI_freelistN(&lc->object_bases);
+}
+
+/**
+ * When freeing the entire SceneLayer at once we don't bother with unref
+ * otherwise SceneLayer is passed to keep the syncing of the LayerCollection tree
+ */
+static void layer_collection_free(SceneLayer *sl, LayerCollection *lc)
+{
+	layer_collection_objects_unpopulate(sl, lc);
 	BLI_freelistN(&lc->overrides);
 
 	if (lc->properties) {
@@ -357,6 +358,15 @@ static LayerCollection *collection_from_index(ListBase *lb, const int number, in
 }
 
 /**
+ * Get the collection for a given index
+ */
+LayerCollection *BKE_layer_collection_from_index(SceneLayer *sl, const int index)
+{
+	int i = 0;
+	return collection_from_index(&sl->layer_collections, index, &i);
+}
+
+/**
  * Get the active collection
  */
 LayerCollection *BKE_layer_collection_get_active(SceneLayer *sl)
@@ -802,6 +812,60 @@ void BKE_collection_unlink(SceneLayer *sl, LayerCollection *lc)
 	sl->active_collection = 0;
 }
 
+/**
+ * Recursively enable nested collections
+ */
+static void layer_collection_enable(SceneLayer *sl, LayerCollection *lc)
+{
+	layer_collection_objects_populate(sl, lc, &lc->scene_collection->objects);
+
+	for (LayerCollection *nlc = lc->layer_collections.first; nlc; nlc = nlc->next) {
+		layer_collection_enable(sl, nlc);
+	}
+}
+
+/**
+ * Enable collection
+ * Add its objects bases to SceneLayer
+ * Depsgraph needs to be rebuilt afterwards
+ */
+void BKE_collection_enable(SceneLayer *sl, LayerCollection *lc)
+{
+	if ((lc->flag & COLLECTION_DISABLED) == 0) {
+		return;
+	}
+
+	lc->flag &= ~COLLECTION_DISABLED;
+	layer_collection_enable(sl, lc);
+}
+
+/**
+ * Recursively disable nested collections
+ */
+static void layer_collection_disable(SceneLayer *sl, LayerCollection *lc)
+{
+	layer_collection_objects_unpopulate(sl, lc);
+
+	for (LayerCollection *nlc = lc->layer_collections.first; nlc; nlc = nlc->next) {
+		layer_collection_disable(sl, nlc);
+	}
+}
+
+/**
+ * Disable collection
+ * Remove all its object bases from SceneLayer
+ * Depsgraph needs to be rebuilt afterwards
+ */
+void BKE_collection_disable(SceneLayer *sl, LayerCollection *lc)
+{
+	if ((lc->flag & COLLECTION_DISABLED) != 0) {
+		return;
+	}
+
+	lc->flag |= COLLECTION_DISABLED;
+	layer_collection_disable(sl, lc);
+}
+
 static void layer_collection_object_add(SceneLayer *sl, LayerCollection *lc, Object *ob)
 {
 	Base *base = object_base_add(sl, ob);
@@ -1356,7 +1420,7 @@ void BKE_collection_engine_property_add_float_array(
 	val.array.len = array_length;
 	val.array.type = IDP_FLOAT;
 
-	IDProperty *idprop= IDP_New(IDP_ARRAY, &val, name);
+	IDProperty *idprop = IDP_New(IDP_ARRAY, &val, name);
 	memcpy(IDP_Array(idprop), values, sizeof(float) * idprop->len);
 	IDP_AddToGroup(props, idprop);
 }
@@ -1739,10 +1803,10 @@ static void idproperty_reset(IDProperty **props, IDProperty *props_ref)
 	}
 }
 
-void BKE_layer_eval_layer_collection_pre(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_layer_eval_layer_collection_pre(const struct EvaluationContext *UNUSED(eval_ctx),
                                          Scene *scene, SceneLayer *scene_layer)
 {
-	DEBUG_PRINT("%s on %s\n", __func__, scene_layer->name);
+	DEBUG_PRINT("%s on %s (%p)\n", __func__, scene_layer->name, scene_layer);
 	for (Base *base = scene_layer->object_bases.first; base != NULL; base = base->next) {
 		base->flag &= ~(BASE_VISIBLED | BASE_SELECTABLED);
 		idproperty_reset(&base->collection_properties, scene->collection_properties);
@@ -1756,14 +1820,16 @@ void BKE_layer_eval_layer_collection_pre(struct EvaluationContext *UNUSED(eval_c
 	scene_layer->flag |= SCENE_LAYER_ENGINE_DIRTY;
 }
 
-void BKE_layer_eval_layer_collection(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_layer_eval_layer_collection(const struct EvaluationContext *UNUSED(eval_ctx),
                                      LayerCollection *layer_collection,
                                      LayerCollection *parent_layer_collection)
 {
-	DEBUG_PRINT("%s on %s, parent %s\n",
+	DEBUG_PRINT("%s on %s (%p), parent %s (%p)\n",
 	            __func__,
 	            layer_collection->scene_collection->name,
-	            (parent_layer_collection != NULL) ? parent_layer_collection->scene_collection->name : "NONE");
+	            layer_collection->scene_collection,
+	            (parent_layer_collection != NULL) ? parent_layer_collection->scene_collection->name : "NONE",
+	            (parent_layer_collection != NULL) ? parent_layer_collection->scene_collection : NULL);
 
 	/* visibility */
 	layer_collection->flag_evaluated = layer_collection->flag;
@@ -1794,6 +1860,9 @@ void BKE_layer_eval_layer_collection(struct EvaluationContext *UNUSED(eval_ctx),
 			IDP_MergeGroup(base->collection_properties, layer_collection->properties_evaluated, true);
 			base->flag |= BASE_VISIBLED;
 		}
+		else {
+			base->flag &= ~BASE_VISIBLED;
+		}
 
 		if (is_selectable) {
 			base->flag |= BASE_SELECTABLED;
@@ -1801,10 +1870,10 @@ void BKE_layer_eval_layer_collection(struct EvaluationContext *UNUSED(eval_ctx),
 	}
 }
 
-void BKE_layer_eval_layer_collection_post(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_layer_eval_layer_collection_post(const struct EvaluationContext *UNUSED(eval_ctx),
                                           SceneLayer *scene_layer)
 {
-	DEBUG_PRINT("%s on %s\n", __func__, scene_layer->name);
+	DEBUG_PRINT("%s on %s (%p)\n", __func__, scene_layer->name, scene_layer);
 	/* if base is not selectabled, clear select */
 	for (Base *base = scene_layer->object_bases.first; base; base = base->next) {
 		if ((base->flag & BASE_SELECTABLED) == 0) {
diff --git a/source/blender/blenkernel/intern/library.c b/source/blender/blenkernel/intern/library.c
index ed64de9b1aa..71fbb3d726a 100644
--- a/source/blender/blenkernel/intern/library.c
+++ b/source/blender/blenkernel/intern/library.c
@@ -385,7 +385,6 @@ bool id_make_local(Main *bmain, ID *id, const bool test, const bool lib_local)
 
 	switch ((ID_Type)GS(id->name)) {
 		case ID_SCE:
-			/* Partially implemented (has no copy...). */
 			if (!test) BKE_scene_make_local(bmain, (Scene *)id, lib_local);
 			return true;
 		case ID_OB:
@@ -428,14 +427,12 @@ bool id_make_local(Main *bmain, ID *id, const bool test, const bool lib_local)
 			if (!test) BKE_world_make_local(bmain, (World *)id, lib_local);
 			return true;
 		case ID_VF:
-			/* Partially implemented (has no copy...). */
 			if (!test) BKE_vfont_make_local(bmain, (VFont *)id, lib_local);
 			return true;
 		case ID_TXT:
 			if (!test) BKE_text_make_local(bmain, (Text *)id, lib_local);
 			return true;
 		case ID_SO:
-			/* Partially implemented (has no copy...). */
 			if (!test) BKE_sound_make_local(bmain, (bSound *)id, lib_local);
 			return true;
 		case ID_GR:
@@ -493,118 +490,193 @@ bool id_make_local(Main *bmain, ID *id, const bool test, const bool lib_local)
 	return false;
 }
 
+struct IDCopyLibManagementData {
+	const ID *id_src;
+	ID *id_dst;
+	int flag;
+};
+
+/* Increases usercount as required, and remap self ID pointers. */
+static int id_copy_libmanagement_cb(void *user_data, ID *UNUSED(id_self), ID **id_pointer, int cb_flag)
+{
+	struct IDCopyLibManagementData *data = user_data;
+	ID *id = *id_pointer;
+
+	/* Remap self-references to new copied ID. */
+	if (id == data->id_src) {
+		/* We cannot use id_self here, it is not *always* id_dst (thanks to $£!+@#&/? nodetrees). */
+		id = *id_pointer = data->id_dst;
+	}
+
+	/* Increase used IDs refcount if needed and required. */
+	if ((data->flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0 && (cb_flag & IDWALK_CB_USER)) {
+		id_us_plus(id);
+	}
+
+	return IDWALK_RET_NOP;
+}
+
 /**
- * Invokes the appropriate copy method for the block and returns the result in
- * newid, unless test. Returns true if the block can be copied.
+ * Generic entry point for copying a datablock (new API).
+ *
+ * \note Copy is only affecting given data-block (no ID used by copied one will be affected, besides usercount).
+ *       There is only one exception, if LIB_ID_COPY_ACTIONS is defined, actions used by animdata will be duplicated.
+ *
+ * \note Usercount of new copy is always set to 1.
+ *
+ * \param bmain Main database, may be NULL only if LIB_ID_COPY_NO_MAIN is specified.
+ * \param id Source datablock.
+ * \param r_newid Pointer to new (copied) ID pointer.
+ * \param flag Set of copy options, see DNA_ID.h enum for details (leave to zero for default, full copy).
+ * \param test If set, do not do any copy, just test whether copy is supported.
+ * \return False when copying that ID type is not supported, true otherwise.
  */
-bool id_copy(Main *bmain, const ID *id, ID **newid, bool test)
+/* XXX TODO remove test thing, *all* IDs should be copyable that way! */
+bool BKE_id_copy_ex(Main *bmain, const ID *id, ID **r_newid, const int flag, const bool test)
 {
-	if (!test) {
-		*newid = NULL;
+#define LIB_ID_TYPES_NOCOPY ID_LI, ID_SCR, ID_WM,  /* Not supported */ \
+                            ID_IP  /* Deprecated */
+
+	BLI_assert(test || (r_newid != NULL));
+	if (r_newid != NULL) {
+		*r_newid = NULL;
+	}
+	if (id == NULL) {
+		return false;
 	}
 
-	/* conventions:
-	 * - make shallow copy, only this ID block
-	 * - id.us of the new ID is set to 1 */
+	if (ELEM(GS(id->name), LIB_ID_TYPES_NOCOPY)) {
+		return false;
+	}
+	else if (test) {
+		return true;
+	}
+
+	BKE_libblock_copy_ex(bmain, id, r_newid, flag);
+
 	switch ((ID_Type)GS(id->name)) {
+		case ID_SCE:
+			BKE_scene_copy_data(bmain, (Scene *)*r_newid, (Scene *)id, flag);
+			break;
 		case ID_OB:
-			if (!test) *newid = (ID *)BKE_object_copy(bmain, (Object *)id);
-			return true;
+			BKE_object_copy_data(bmain, (Object *)*r_newid, (Object *)id, flag);
+			break;
 		case ID_ME:
-			if (!test) *newid = (ID *)BKE_mesh_copy(bmain, (Mesh *)id);
-			return true;
+			BKE_mesh_copy_data(bmain, (Mesh *)*r_newid, (Mesh *)id, flag);
+			break;
 		case ID_CU:
-			if (!test) *newid = (ID *)BKE_curve_copy(bmain, (Curve *)id);
-			return true;
+			BKE_curve_copy_data(bmain, (Curve *)*r_newid, (Curve *)id, flag);
+			break;
 		case ID_MB:
-			if (!test) *newid = (ID *)BKE_mball_copy(bmain, (MetaBall *)id);
-			return true;
+			BKE_mball_copy_data(bmain, (MetaBall *)*r_newid, (MetaBall *)id, flag);
+			break;
 		case ID_MA:
-			if (!test) *newid = (ID *)BKE_material_copy(bmain, (Material *)id);
-			return true;
+			BKE_material_copy_data(bmain, (Material *)*r_newid, (Material *)id, flag);
+			break;
 		case ID_TE:
-			if (!test) *newid = (ID *)BKE_texture_copy(bmain, (Tex *)id);
-			return true;
+			BKE_texture_copy_data(bmain, (Tex *)*r_newid, (Tex *)id, flag);
+			break;
 		case ID_IM:
-			if (!test) *newid = (ID *)BKE_image_copy(bmain, (Image *)id);
-			return true;
+			BKE_image_copy_data(bmain, (Image *)*r_newid, (Image *)id, flag);
+			break;
 		case ID_LT:
-			if (!test) *newid = (ID *)BKE_lattice_copy(bmain, (Lattice *)id);
-			return true;
+			BKE_lattice_copy_data(bmain, (Lattice *)*r_newid, (Lattice *)id, flag);
+			break;
 		case ID_LA:
-			if (!test) *newid = (ID *)BKE_lamp_copy(bmain, (Lamp *)id);
-			return true;
+			BKE_lamp_copy_data(bmain, (Lamp *)*r_newid, (Lamp *)id, flag);
+			break;
 		case ID_SPK:
-			if (!test) *newid = (ID *)BKE_speaker_copy(bmain, (Speaker *)id);
-			return true;
+			BKE_speaker_copy_data(bmain, (Speaker *)*r_newid, (Speaker *)id, flag);
+			break;
 		case ID_LP:
-			if (!test) *newid = (ID *)BKE_lightprobe_copy(bmain, (LightProbe *)id);
-			return true;
+			BKE_lightprobe_copy_data(bmain, (LightProbe *)*r_newid, (LightProbe *)id, flag);
+			break;
 		case ID_CA:
-			if (!test) *newid = (ID *)BKE_camera_copy(bmain, (Camera *)id);
-			return true;
+			BKE_camera_copy_data(bmain, (Camera *)*r_newid, (Camera *)id, flag);
+			break;
 		case ID_KE:
-			if (!test) *newid = (ID *)BKE_key_copy(bmain, (Key *)id);
-			return true;
+			BKE_key_copy_data(bmain, (Key *)*r_newid, (Key *)id, flag);
+			break;
 		case ID_WO:
-			if (!test) *newid = (ID *)BKE_world_copy(bmain, (World *)id);
-			return true;
+			BKE_world_copy_data(bmain, (World *)*r_newid, (World *)id, flag);
+			break;
 		case ID_TXT:
-			if (!test) *newid = (ID *)BKE_text_copy(bmain, (Text *)id);
-			return true;
+			BKE_text_copy_data(bmain, (Text *)*r_newid, (Text *)id, flag);
+			break;
 		case ID_GR:
-			if (!test) *newid = (ID *)BKE_group_copy(bmain, (Group *)id);
-			return true;
+			BKE_group_copy_data(bmain, (Group *)*r_newid, (Group *)id, flag);
+			break;
 		case ID_AR:
-			if (!test) *newid = (ID *)BKE_armature_copy(bmain, (bArmature *)id);
-			return true;
+			BKE_armature_copy_data(bmain, (bArmature *)*r_newid, (bArmature *)id, flag);
+			break;
 		case ID_AC:
-			if (!test) *newid = (ID *)BKE_action_copy(bmain, (bAction *)id);
-			return true;
+			BKE_action_copy_data(bmain, (bAction *)*r_newid, (bAction *)id, flag);
+			break;
 		case ID_NT:
-			if (!test) *newid = (ID *)ntreeCopyTree(bmain, (bNodeTree *)id);
-			return true;
+			BKE_node_tree_copy_data(bmain, (bNodeTree *)*r_newid, (bNodeTree *)id, flag);
+			break;
 		case ID_BR:
-			if (!test) *newid = (ID *)BKE_brush_copy(bmain, (Brush *)id);
-			return true;
+			BKE_brush_copy_data(bmain, (Brush *)*r_newid, (Brush *)id, flag);
+			break;
 		case ID_PA:
-			if (!test) *newid = (ID *)BKE_particlesettings_copy(bmain, (ParticleSettings *)id);
-			return true;
+			BKE_particlesettings_copy_data(bmain, (ParticleSettings *)*r_newid, (ParticleSettings *)id, flag);
+			break;
 		case ID_GD:
-			if (!test) *newid = (ID *)BKE_gpencil_data_duplicate(bmain, (bGPdata *)id, false);
-			return true;
+			BKE_gpencil_copy_data(bmain, (bGPdata *)*r_newid, (bGPdata *)id, flag);
+			break;
 		case ID_MC:
-			if (!test) *newid = (ID *)BKE_movieclip_copy(bmain, (MovieClip *)id);
-			return true;
+			BKE_movieclip_copy_data(bmain, (MovieClip *)*r_newid, (MovieClip *)id, flag);
+			break;
 		case ID_MSK:
-			if (!test) *newid = (ID *)BKE_mask_copy(bmain, (Mask *)id);
-			return true;
+			BKE_mask_copy_data(bmain, (Mask *)*r_newid, (Mask *)id, flag);
+			break;
 		case ID_LS:
-			if (!test) *newid = (ID *)BKE_linestyle_copy(bmain, (FreestyleLineStyle *)id);
-			return true;
+			BKE_linestyle_copy_data(bmain, (FreestyleLineStyle *)*r_newid, (FreestyleLineStyle *)id, flag);
+			break;
 		case ID_PAL:
-			if (!test) *newid = (ID *)BKE_palette_copy(bmain, (Palette *)id);
-			return true;
+			BKE_palette_copy_data(bmain, (Palette *)*r_newid, (Palette *)id, flag);
+			break;
 		case ID_PC:
-			if (!test) *newid = (ID *)BKE_paint_curve_copy(bmain, (PaintCurve *)id);
-			return true;
+			BKE_paint_curve_copy_data(bmain, (PaintCurve *)*r_newid, (PaintCurve *)id, flag);
+			break;
 		case ID_CF:
-			if (!test) *newid = (ID *)BKE_cachefile_copy(bmain, (CacheFile *)id);
-			return true;
-		case ID_WS:
-		case ID_SCE:
+			BKE_cachefile_copy_data(bmain, (CacheFile *)*r_newid, (CacheFile *)id, flag);
+			break;
+		case ID_SO:
+			BKE_sound_copy_data(bmain, (bSound *)*r_newid, (bSound *)id, flag);
+			break;
+		case ID_VF:
+			BKE_vfont_copy_data(bmain, (VFont *)*r_newid, (VFont *)id, flag);
+			break;
 		case ID_LI:
 		case ID_SCR:
 		case ID_WM:
-			return false;  /* can't be copied from here */
-		case ID_VF:
-		case ID_SO:
-			return false;  /* not implemented */
+		case ID_WS:
 		case ID_IP:
-			return false;  /* deprecated */
+			BLI_assert(0);  /* Should have been rejected at start of function! */
+			break;
 	}
-	
-	return false;
+
+	/* Update ID refcount, remap pointers to self in new ID. */
+	struct IDCopyLibManagementData data = {.id_src = id, .id_dst = *r_newid, .flag = flag};
+	BKE_library_foreach_ID_link(bmain, *r_newid, id_copy_libmanagement_cb, &data, IDWALK_NOP);
+
+	/* Do not make new copy local in case we are copying outside of main...
+	 * XXX TODO: is this behavior OK, or should we need own flag to control that? */
+	if ((flag & LIB_ID_CREATE_NO_MAIN) == 0) {
+		BKE_id_copy_ensure_local(bmain, id, *r_newid);
+	}
+
+	return true;
+}
+
+/**
+ * Invokes the appropriate copy method for the block and returns the result in
+ * newid, unless test. Returns true if the block can be copied.
+ */
+bool id_copy(Main *bmain, const ID *id, ID **newid, bool test)
+{
+	return BKE_id_copy_ex(bmain, id, newid, 0, test);
 }
 
 /** Does *not* set ID->newid pointer. */
@@ -636,6 +708,101 @@ bool id_single_user(bContext *C, ID *id, PointerRNA *ptr, PropertyRNA *prop)
 	return false;
 }
 
+static int libblock_management_us_plus(void *UNUSED(user_data), ID *UNUSED(id_self), ID **id_pointer, int cb_flag)
+{
+	if (cb_flag & IDWALK_CB_USER) {
+		id_us_plus(*id_pointer);
+	}
+	if (cb_flag & IDWALK_CB_USER_ONE) {
+		id_us_ensure_real(*id_pointer);
+	}
+
+	return IDWALK_RET_NOP;
+}
+
+static int libblock_management_us_min(void *UNUSED(user_data), ID *UNUSED(id_self), ID **id_pointer, int cb_flag)
+{
+	if (cb_flag & IDWALK_CB_USER) {
+		id_us_min(*id_pointer);
+	}
+	/* We can do nothing in IDWALK_CB_USER_ONE case! */
+
+	return IDWALK_RET_NOP;
+}
+
+/** Add a 'NO_MAIN' datablock to given main (also sets usercounts of its IDs if needed). */
+void BKE_libblock_management_main_add(Main *bmain, void *idv)
+{
+	ID *id = idv;
+
+	BLI_assert(bmain != NULL);
+	if ((id->tag & LIB_TAG_NO_MAIN) == 0) {
+		return;
+	}
+
+	if ((id->tag & LIB_TAG_NOT_ALLOCATED) != 0) {
+		/* We cannot add non-allocated ID to Main! */
+		return;
+	}
+
+	/* We cannot allow non-userrefcounting IDs in Main database! */
+	if ((id->tag & LIB_TAG_NO_USER_REFCOUNT) != 0) {
+		BKE_library_foreach_ID_link(bmain, id, libblock_management_us_plus, NULL, IDWALK_NOP);
+	}
+
+	ListBase *lb = which_libbase(bmain, GS(id->name));
+	BKE_main_lock(bmain);
+	BLI_addtail(lb, id);
+	new_id(lb, id, NULL);
+	/* alphabetic insertion: is in new_id */
+	id->tag &= ~(LIB_TAG_NO_MAIN | LIB_TAG_NO_USER_REFCOUNT);
+	BKE_main_unlock(bmain);
+}
+
+/** Remove a datablock from given main (set it to 'NO_MAIN' status). */
+void BKE_libblock_management_main_remove(Main *bmain, void *idv)
+{
+	ID *id = idv;
+
+	BLI_assert(bmain != NULL);
+	if ((id->tag & LIB_TAG_NO_MAIN) != 0) {
+		return;
+	}
+
+	/* For now, allow userrefcounting IDs to get out of Main - can be handy in some cases... */
+
+	ListBase *lb = which_libbase(bmain, GS(id->name));
+	BKE_main_lock(bmain);
+	BLI_remlink(lb, id);
+	id->tag |= LIB_TAG_NO_MAIN;
+	BKE_main_unlock(bmain);
+}
+
+void BKE_libblock_management_usercounts_set(Main *bmain, void *idv)
+{
+	ID *id = idv;
+
+	if ((id->tag & LIB_TAG_NO_USER_REFCOUNT) == 0) {
+		return;
+	}
+
+	BKE_library_foreach_ID_link(bmain, id, libblock_management_us_plus, NULL, IDWALK_NOP);
+	id->tag &= ~LIB_TAG_NO_USER_REFCOUNT;
+}
+
+void BKE_libblock_management_usercounts_clear(Main *bmain, void *idv)
+{
+	ID *id = idv;
+
+	/* We do not allow IDs in Main database to not be userrefcounting. */
+	if ((id->tag & LIB_TAG_NO_USER_REFCOUNT) != 0 || (id->tag & LIB_TAG_NO_MAIN) != 0) {
+		return;
+	}
+
+	BKE_library_foreach_ID_link(bmain, id, libblock_management_us_min, NULL, IDWALK_NOP);
+	id->tag |= LIB_TAG_NO_USER_REFCOUNT;
+}
+
 ListBase *which_libbase(Main *mainlib, short type)
 {
 	switch ((ID_Type)type) {
@@ -953,23 +1120,44 @@ void *BKE_libblock_alloc_notest(short type)
  * The user count is set to 1, all other content (apart from name and links) being
  * initialized to zero.
  */
-void *BKE_libblock_alloc(Main *bmain, short type, const char *name)
+void *BKE_libblock_alloc(Main *bmain, short type, const char *name, const int flag)
 {
-	ID *id = NULL;
-	ListBase *lb = which_libbase(bmain, type);
-	
-	id = BKE_libblock_alloc_notest(type);
+	BLI_assert((flag & LIB_ID_CREATE_NO_ALLOCATE) == 0);
+
+	ID *id = BKE_libblock_alloc_notest(type);
+
 	if (id) {
-		BKE_main_lock(bmain);
-		BLI_addtail(lb, id);
-		id->us = 1;
+		if ((flag & LIB_ID_CREATE_NO_MAIN) != 0) {
+			id->tag |= LIB_TAG_NO_MAIN;
+		}
+		if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) != 0) {
+			id->tag |= LIB_TAG_NO_USER_REFCOUNT;
+		}
+
 		id->icon_id = 0;
-		*( (short *)id->name) = type;
-		new_id(lb, id, name);
-		/* alphabetic insertion: is in new_id */
-		BKE_main_unlock(bmain);
+		*((short *)id->name) = type;
+		if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+			id->us = 1;
+		}
+		if ((flag & LIB_ID_CREATE_NO_MAIN) == 0) {
+			ListBase *lb = which_libbase(bmain, type);
+
+			BKE_main_lock(bmain);
+			BLI_addtail(lb, id);
+			new_id(lb, id, name);
+			/* alphabetic insertion: is in new_id */
+			BKE_main_unlock(bmain);
+
+			/* TODO to be removed from here! */
+			if ((flag & LIB_ID_CREATE_NO_DEG_TAG) == 0) {
+				DEG_id_type_tag(bmain, type);
+			}
+		}
+		else {
+			BLI_strncpy(id->name + 2, name, sizeof(id->name) - 2);
+		}
 	}
-	DEG_id_type_tag(bmain, type);
+
 	return id;
 }
 
@@ -1095,70 +1283,80 @@ void BKE_libblock_init_empty(ID *id)
 
 /* by spec, animdata is first item after ID */
 /* and, trust that BKE_animdata_from_id() will only find AnimData for valid ID-types */
-static void id_copy_animdata(ID *id, const bool do_action)
+static void id_copy_animdata(Main *bmain, ID *id, const bool do_action)
 {
 	AnimData *adt = BKE_animdata_from_id(id);
 	
 	if (adt) {
 		IdAdtTemplate *iat = (IdAdtTemplate *)id;
-		iat->adt = BKE_animdata_copy(iat->adt, do_action); /* could be set to false, need to investigate */
+		iat->adt = BKE_animdata_copy(bmain, iat->adt, do_action); /* could be set to false, need to investigate */
 	}
 }
 
-/* material nodes use this since they are not treated as libdata */
-void BKE_libblock_copy_data(ID *id, const ID *id_from, const bool do_action)
+void BKE_libblock_copy_ex(Main *bmain, const ID *id, ID **r_newid, const int flag)
 {
-	if (id_from->properties)
-		id->properties = IDP_CopyProperty(id_from->properties);
+	ID *new_id = *r_newid;
+
+	/* Grrrrrrrrr... Not adding 'root' nodetrees to bmain.... grrrrrrrrrrrrrrrrrrrr! */
+	/* This is taken from original ntree copy code, might be weak actually? */
+	const bool use_nodetree_alloc_exception = ((GS(id->name) == ID_NT) && (bmain != NULL) &&
+	                                           (BLI_findindex(&bmain->nodetree, id) < 0));
+
+	BLI_assert((flag & LIB_ID_CREATE_NO_MAIN) != 0 || bmain != NULL);
+	BLI_assert((flag & LIB_ID_CREATE_NO_MAIN) != 0 || (flag & LIB_ID_CREATE_NO_ALLOCATE) == 0);
+	BLI_assert((flag & LIB_ID_CREATE_NO_MAIN) == 0 || (flag & LIB_ID_CREATE_NO_USER_REFCOUNT) != 0);
+
+	if ((flag & LIB_ID_CREATE_NO_ALLOCATE) != 0) {
+		/* r_newid already contains pointer to allocated memory. */
+		/* TODO do we want to memset(0) whole mem before filling it? */
+		BLI_strncpy(new_id->name, id->name, sizeof(new_id->name));
+		new_id->us = 0;
+		new_id->tag |= LIB_TAG_NOT_ALLOCATED | LIB_TAG_NO_MAIN | LIB_TAG_NO_USER_REFCOUNT;
+		/* TODO Do we want/need to copy more from ID struct itself? */
+	}
+	else {
+		new_id = BKE_libblock_alloc(bmain, GS(id->name), id->name + 2, flag | (use_nodetree_alloc_exception ? LIB_ID_CREATE_NO_MAIN : 0));
+	}
+	BLI_assert(new_id != NULL);
+
+	const size_t id_len = BKE_libblock_get_alloc_info(GS(new_id->name), NULL);
+	const size_t id_offset = sizeof(ID);
+	if ((int)id_len - (int)id_offset > 0) { /* signed to allow neg result */ /* XXX ????? */
+		const char *cp = (const char *)id;
+		char *cpn = (char *)new_id;
+
+		memcpy(cpn + id_offset, cp + id_offset, id_len - id_offset);
+	}
+
+	if (id->properties) {
+		new_id->properties = IDP_CopyProperty_ex(id->properties, flag);
+	}
 
 	/* the duplicate should get a copy of the animdata */
-	id_copy_animdata(id, do_action);
+	id_copy_animdata(bmain, new_id, (flag & LIB_ID_COPY_ACTIONS) != 0 && (flag & LIB_ID_CREATE_NO_MAIN) == 0);
+
+	if ((flag & LIB_ID_CREATE_NO_DEG_TAG) == 0 && (flag & LIB_ID_CREATE_NO_MAIN) == 0) {
+		DEG_id_type_tag(bmain, GS(new_id->name));
+	}
+
+	*r_newid = new_id;
 }
 
 /* used everywhere in blenkernel */
 void *BKE_libblock_copy(Main *bmain, const ID *id)
 {
 	ID *idn;
-	size_t idn_len;
-
-	idn = BKE_libblock_alloc(bmain, GS(id->name), id->name + 2);
 
-	assert(idn != NULL);
+	BKE_libblock_copy_ex(bmain, id, &idn, 0);
 
-	idn_len = MEM_allocN_len(idn);
-	if ((int)idn_len - (int)sizeof(ID) > 0) { /* signed to allow neg result */
-		const char *cp = (const char *)id;
-		char *cpn = (char *)idn;
-
-		memcpy(cpn + sizeof(ID), cp + sizeof(ID), idn_len - sizeof(ID));
-	}
-
-	BKE_libblock_copy_data(idn, id, false);
-	
 	return idn;
 }
 
 void *BKE_libblock_copy_nolib(const ID *id, const bool do_action)
 {
 	ID *idn;
-	size_t idn_len;
-
-	idn = BKE_libblock_alloc_notest(GS(id->name));
-	assert(idn != NULL);
-
-	BLI_strncpy(idn->name, id->name, sizeof(idn->name));
-
-	idn_len = MEM_allocN_len(idn);
-	if ((int)idn_len - (int)sizeof(ID) > 0) { /* signed to allow neg result */
-		const char *cp = (const char *)id;
-		char *cpn = (char *)idn;
-
-		memcpy(cpn + sizeof(ID), cp + sizeof(ID), idn_len - sizeof(ID));
-	}
-
-	idn->us = 1;
 
-	BKE_libblock_copy_data(idn, id, do_action);
+	BKE_libblock_copy_ex(NULL, id, &idn, LIB_ID_CREATE_NO_MAIN | LIB_ID_CREATE_NO_USER_REFCOUNT | (do_action ? LIB_ID_COPY_ACTIONS : 0));
 
 	return idn;
 }
@@ -1198,41 +1396,41 @@ void BKE_main_free(Main *mainvar)
 			/* errors freeing ID's can be hard to track down,
 			 * enable this so valgrind will give the line number in its error log */
 			switch (a) {
-				case   0: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   1: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   2: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   3: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   4: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   5: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   6: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   7: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   8: BKE_libblock_free_ex(mainvar, id, false); break;
-				case   9: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  10: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  11: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  12: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  13: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  14: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  15: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  16: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  17: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  18: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  19: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  20: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  21: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  22: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  23: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  24: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  25: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  26: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  27: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  28: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  29: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  30: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  31: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  32: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  33: BKE_libblock_free_ex(mainvar, id, false); break;
-				case  34: BKE_libblock_free_ex(mainvar, id, false); break;
+				case   0: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   1: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   2: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   3: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   4: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   5: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   6: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   7: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   8: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case   9: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  10: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  11: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  12: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  13: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  14: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  15: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  16: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  17: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  18: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  19: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  20: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  21: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  22: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  23: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  24: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  25: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  26: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  27: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  28: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  29: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  30: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  31: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  32: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  33: BKE_libblock_free_ex(mainvar, id, false, false); break;
+				case  34: BKE_libblock_free_ex(mainvar, id, false, false); break;
 				default:
 					BLI_assert(0);
 					break;
diff --git a/source/blender/blenkernel/intern/library_query.c b/source/blender/blenkernel/intern/library_query.c
index 8a42a3334bd..e397dcf7667 100644
--- a/source/blender/blenkernel/intern/library_query.c
+++ b/source/blender/blenkernel/intern/library_query.c
@@ -536,7 +536,8 @@ void BKE_library_foreach_ID_link(Main *bmain, ID *id, LibraryIDLinkCallback call
 
 				/* Object is special, proxies make things hard... */
 				const int data_cb_flag = data.cb_flag;
-				const int proxy_cb_flag = (object->proxy || object->proxy_group) ? IDWALK_CB_INDIRECT_USAGE : 0;
+				const int proxy_cb_flag = ((data.flag & IDWALK_NO_INDIRECT_PROXY_DATA_USAGE) == 0 && (object->proxy || object->proxy_group)) ?
+				                              IDWALK_CB_INDIRECT_USAGE : 0;
 
 				/* object data special case */
 				data.cb_flag |= proxy_cb_flag;
diff --git a/source/blender/blenkernel/intern/library_remap.c b/source/blender/blenkernel/intern/library_remap.c
index f855de0dac5..8581530907f 100644
--- a/source/blender/blenkernel/intern/library_remap.c
+++ b/source/blender/blenkernel/intern/library_remap.c
@@ -193,8 +193,8 @@ static int foreach_libblock_remap_callback(void *user_data, ID *id_self, ID **id
 		const bool skip_never_null = (id_remap_data->flag & ID_REMAP_SKIP_NEVER_NULL_USAGE) != 0;
 
 #ifdef DEBUG_PRINT
-		printf("In %s: Remapping %s (%p) to %s (%p) (skip_indirect: %d)\n",
-		       id->name, old_id->name, old_id, new_id ? new_id->name : "<NONE>", new_id, skip_indirect);
+		printf("In %s: Remapping %s (%p) to %s (%p) (is_indirect: %d, skip_indirect: %d)\n",
+		       id->name, old_id->name, old_id, new_id ? new_id->name : "<NONE>", new_id, is_indirect, skip_indirect);
 #endif
 
 		if ((id_remap_data->flag & ID_REMAP_FLAG_NEVER_NULL_USAGE) && (cb_flag & IDWALK_CB_NEVER_NULL)) {
@@ -208,6 +208,14 @@ static int foreach_libblock_remap_callback(void *user_data, ID *id_self, ID **id
 		{
 			if (is_indirect) {
 				id_remap_data->skipped_indirect++;
+				if (is_obj) {
+					Object *ob = (Object *)id;
+					if (ob->data == *id_p && ob->proxy != NULL) {
+						/* And another 'Proudly brought to you by Proxy Hell' hack!
+						 * This will allow us to avoid clearing 'LIB_EXTERN' flag of obdata of proxies... */
+						id_remap_data->skipped_direct++;
+					}
+				}
 			}
 			else if (is_never_null || is_obj_editmode) {
 				id_remap_data->skipped_direct++;
@@ -248,7 +256,7 @@ static int foreach_libblock_remap_callback(void *user_data, ID *id_self, ID **id
 	return IDWALK_RET_NOP;
 }
 
-/* Some reamapping unfortunately require extra and/or specific handling, tackle those here. */
+/* Some remapping unfortunately require extra and/or specific handling, tackle those here. */
 static void libblock_remap_data_preprocess_scene_base_unlink(
         IDRemap *r_id_remap_data, Scene *sce, BaseLegacy *base, const bool skip_indirect, const bool is_indirect)
 {
@@ -352,7 +360,7 @@ static void libblock_remap_data_preprocess(IDRemap *r_id_remap_data)
 	}
 }
 
-static void libblock_remap_data_postprocess_object_fromgroup_update(Main *bmain, Object *old_ob, Object *new_ob)
+static void libblock_remap_data_postprocess_object_update(Main *bmain, Object *old_ob, Object *new_ob)
 {
 	if (old_ob->flag & OB_FROMGROUP) {
 		/* Note that for Scene's BaseObject->flag, either we:
@@ -371,6 +379,13 @@ static void libblock_remap_data_postprocess_object_fromgroup_update(Main *bmain,
 			new_ob->flag |= OB_FROMGROUP;
 		}
 	}
+	if (old_ob->type == OB_MBALL) {
+		for (Object *ob = bmain->object.first; ob; ob = ob->id.next) {
+			if (ob->type == OB_MBALL && BKE_mball_is_basis_for(ob, old_ob)) {
+				DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
+			}
+		}
+	}
 }
 
 static void libblock_remap_data_postprocess_group_scene_unlink(Main *UNUSED(bmain), Scene *sce, ID *old_id)
@@ -447,6 +462,7 @@ ATTR_NONNULL(1) static void libblock_remap_data(
 	IDRemap id_remap_data;
 	ListBase *lb_array[MAX_LIBARRAY];
 	int i;
+	const int foreach_id_flags = (remap_flags & ID_REMAP_NO_INDIRECT_PROXY_DATA_USAGE) != 0 ? IDWALK_NO_INDIRECT_PROXY_DATA_USAGE : IDWALK_NOP;
 
 	if (r_id_remap_data == NULL) {
 		r_id_remap_data = &id_remap_data;
@@ -467,7 +483,7 @@ ATTR_NONNULL(1) static void libblock_remap_data(
 #endif
 		r_id_remap_data->id = id;
 		libblock_remap_data_preprocess(r_id_remap_data);
-		BKE_library_foreach_ID_link(NULL, id, foreach_libblock_remap_callback, (void *)r_id_remap_data, IDWALK_NOP);
+		BKE_library_foreach_ID_link(NULL, id, foreach_libblock_remap_callback, (void *)r_id_remap_data, foreach_id_flags);
 	}
 	else {
 		i = set_listbasepointers(bmain, lb_array);
@@ -484,7 +500,7 @@ ATTR_NONNULL(1) static void libblock_remap_data(
 					r_id_remap_data->id = id_curr;
 					libblock_remap_data_preprocess(r_id_remap_data);
 					BKE_library_foreach_ID_link(
-					            NULL, id_curr, foreach_libblock_remap_callback, (void *)r_id_remap_data, IDWALK_NOP);
+					            NULL, id_curr, foreach_libblock_remap_callback, (void *)r_id_remap_data, foreach_id_flags);
 				}
 			}
 		}
@@ -574,7 +590,7 @@ void BKE_libblock_remap_locked(
 	 */
 	switch (GS(old_id->name)) {
 		case ID_OB:
-			libblock_remap_data_postprocess_object_fromgroup_update(bmain, (Object *)old_id, (Object *)new_id);
+			libblock_remap_data_postprocess_object_update(bmain, (Object *)old_id, (Object *)new_id);
 			break;
 		case ID_GR:
 			if (!new_id) {  /* Only affects us in case group was unlinked. */
@@ -604,7 +620,7 @@ void BKE_libblock_remap_locked(
 	libblock_remap_data_postprocess_nodetree_update(bmain, new_id);
 	BKE_main_lock(bmain);
 
-	/* Full rebuild of DAG! */
+	/* Full rebuild of DEG! */
 	DEG_relations_tag_update(bmain);
 }
 
@@ -684,8 +700,7 @@ void BKE_libblock_relink_ex(
 				switch (GS(old_id->name)) {
 					case ID_OB:
 					{
-						libblock_remap_data_postprocess_object_fromgroup_update(
-						            bmain, (Object *)old_id, (Object *)new_id);
+						libblock_remap_data_postprocess_object_update(bmain, (Object *)old_id, (Object *)new_id);
 						break;
 					}
 					case ID_GR:
@@ -700,7 +715,7 @@ void BKE_libblock_relink_ex(
 			else {
 				/* No choice but to check whole objects/groups. */
 				for (Object *ob = bmain->object.first; ob; ob = ob->id.next) {
-					libblock_remap_data_postprocess_object_fromgroup_update(bmain, ob, NULL);
+					libblock_remap_data_postprocess_object_update(bmain, ob, NULL);
 				}
 				for (Group *grp = bmain->group.first; grp; grp = grp->id.next) {
 					libblock_remap_data_postprocess_group_scene_unlink(bmain, sce, NULL);
@@ -757,9 +772,11 @@ void BKE_libblock_free_data(ID *id, const bool do_id_user)
 		IDP_FreeProperty_ex(id->properties, do_id_user);
 		MEM_freeN(id->properties);
 	}
+
+	/* XXX TODO remove animdata handling from each type's freeing func, and do it here, like for copy! */
 }
 
-void BKE_libblock_free_datablock(ID *id)
+void BKE_libblock_free_datablock(ID *id, const int UNUSED(flag))
 {
 	const short type = GS(id->name);
 	switch (type) {
@@ -875,6 +892,90 @@ void BKE_libblock_free_datablock(ID *id)
 	}
 }
 
+
+void BKE_id_free_ex(Main *bmain, void *idv, int flag, const bool use_flag_from_idtag)
+{
+	ID *id = idv;
+
+	if (use_flag_from_idtag) {
+		if ((id->tag & LIB_TAG_NO_MAIN) != 0) {
+			flag |= LIB_ID_FREE_NO_MAIN;
+		}
+		else {
+			flag &= ~LIB_ID_FREE_NO_MAIN;
+		}
+
+		if ((id->tag & LIB_TAG_NO_USER_REFCOUNT) != 0) {
+			flag |= LIB_ID_FREE_NO_USER_REFCOUNT;
+		}
+		else {
+			flag &= ~LIB_ID_FREE_NO_USER_REFCOUNT;
+		}
+
+		if ((id->tag & LIB_TAG_NOT_ALLOCATED) != 0) {
+			flag |= LIB_ID_FREE_NOT_ALLOCATED;
+		}
+		else {
+			flag &= ~LIB_ID_FREE_NOT_ALLOCATED;
+		}
+	}
+
+	BLI_assert((flag & LIB_ID_FREE_NO_MAIN) != 0 || bmain != NULL);
+	BLI_assert((flag & LIB_ID_FREE_NO_MAIN) != 0 || (flag & LIB_ID_FREE_NOT_ALLOCATED) == 0);
+	BLI_assert((flag & LIB_ID_FREE_NO_MAIN) != 0 || (flag & LIB_ID_FREE_NO_USER_REFCOUNT) == 0);
+
+	const short type = GS(id->name);
+
+	if (bmain && (flag & LIB_ID_FREE_NO_DEG_TAG) == 0) {
+		DEG_id_type_tag(bmain, type);
+	}
+
+#ifdef WITH_PYTHON
+	BPY_id_release(id);
+#endif
+
+	if ((flag & LIB_ID_FREE_NO_USER_REFCOUNT) == 0) {
+		BKE_libblock_relink_ex(bmain, id, NULL, NULL, true);
+	}
+
+	BKE_libblock_free_datablock(id, flag);
+
+	/* avoid notifying on removed data */
+	if (bmain) {
+		BKE_main_lock(bmain);
+	}
+
+	if ((flag & LIB_ID_FREE_NO_UI_USER) == 0) {
+		if (free_notifier_reference_cb) {
+			free_notifier_reference_cb(id);
+		}
+
+		if (remap_editor_id_reference_cb) {
+			remap_editor_id_reference_cb(id, NULL);
+		}
+	}
+
+	if ((flag & LIB_ID_FREE_NO_MAIN) == 0) {
+		ListBase *lb = which_libbase(bmain, type);
+		BLI_remlink(lb, id);
+	}
+
+	BKE_libblock_free_data(id, (flag & LIB_ID_FREE_NO_USER_REFCOUNT) == 0);
+
+	if (bmain) {
+		BKE_main_unlock(bmain);
+	}
+
+	if ((flag & LIB_ID_FREE_NOT_ALLOCATED) == 0) {
+		MEM_freeN(id);
+	}
+}
+
+void BKE_id_free(Main *bmain, void *idv)
+{
+	BKE_id_free_ex(bmain, idv, 0, true);
+}
+
 /**
  * used in headerbuttons.c image.c mesh.c screen.c sound.c and library.c
  *
@@ -892,14 +993,19 @@ void BKE_libblock_free_ex(Main *bmain, void *idv, const bool do_id_user, const b
 	DEG_id_type_tag(bmain, type);
 
 #ifdef WITH_PYTHON
+#ifdef WITH_PYTHON_SAFETY
 	BPY_id_release(id);
 #endif
+	if (id->py_instance) {
+		BPY_DECREF_RNA_INVALIDATE(id->py_instance);
+	}
+#endif
 
 	if (do_id_user) {
 		BKE_libblock_relink_ex(bmain, id, NULL, NULL, true);
 	}
 
-	BKE_libblock_free_datablock(id);
+	BKE_libblock_free_datablock(id, 0);
 
 	/* avoid notifying on removed data */
 	BKE_main_lock(bmain);
diff --git a/source/blender/blenkernel/intern/lightprobe.c b/source/blender/blenkernel/intern/lightprobe.c
index a1fa266512b..03bd2344f7b 100644
--- a/source/blender/blenkernel/intern/lightprobe.c
+++ b/source/blender/blenkernel/intern/lightprobe.c
@@ -25,7 +25,7 @@
  * ***** END GPL LICENSE BLOCK *****
  */
 
-/** \file blender/blenkernel/intern/probe.c
+/** \file blender/blenkernel/intern/lightprobe.c
  *  \ingroup bke
  */
 
@@ -59,22 +59,32 @@ void *BKE_lightprobe_add(Main *bmain, const char *name)
 {
 	LightProbe *probe;
 
-	probe =  BKE_libblock_alloc(bmain, ID_LP, name);
+	probe =  BKE_libblock_alloc(bmain, ID_LP, name, 0);
 
 	BKE_lightprobe_init(probe);
 
 	return probe;
 }
 
-LightProbe *BKE_lightprobe_copy(Main *bmain, LightProbe *probe)
+/**
+ * Only copy internal data of LightProbe ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_lightprobe_copy_data(
+        Main *UNUSED(bmain), LightProbe *UNUSED(probe_dst), const LightProbe *UNUSED(probe_src), const int UNUSED(flag))
 {
-	LightProbe *probe_new;
-
-	probe_new = BKE_libblock_copy(bmain, &probe->id);
-
-	BKE_id_copy_ensure_local(bmain, &probe->id, &probe_new->id);
+	/* Nothing to do here. */
+}
 
-	return probe_new;
+LightProbe *BKE_lightprobe_copy(Main *bmain, const LightProbe *probe)
+{
+	LightProbe *probe_copy;
+	BKE_id_copy_ex(bmain, &probe->id, (ID **)&probe_copy, 0, false);
+	return probe_copy;
 }
 
 void BKE_lightprobe_make_local(Main *bmain, LightProbe *probe, const bool lib_local)
diff --git a/source/blender/blenkernel/intern/linestyle.c b/source/blender/blenkernel/intern/linestyle.c
index 771e81ddc4f..1b1a12e702a 100644
--- a/source/blender/blenkernel/intern/linestyle.c
+++ b/source/blender/blenkernel/intern/linestyle.c
@@ -119,7 +119,7 @@ FreestyleLineStyle *BKE_linestyle_new(struct Main *bmain, const char *name)
 {
 	FreestyleLineStyle *linestyle;
 
-	linestyle = (FreestyleLineStyle *)BKE_libblock_alloc(bmain, ID_LS, name);
+	linestyle = (FreestyleLineStyle *)BKE_libblock_alloc(bmain, ID_LS, name, 0);
 
 	BKE_linestyle_init(linestyle);
 
@@ -155,73 +155,54 @@ void BKE_linestyle_free(FreestyleLineStyle *linestyle)
 		BKE_linestyle_geometry_modifier_remove(linestyle, m);
 }
 
-FreestyleLineStyle *BKE_linestyle_copy(struct Main *bmain, const FreestyleLineStyle *linestyle)
+/**
+ * Only copy internal data of Linestyle ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_linestyle_copy_data(
+        struct Main *bmain, FreestyleLineStyle *linestyle_dst, const FreestyleLineStyle *linestyle_src, const int flag)
 {
-	FreestyleLineStyle *new_linestyle;
-	LineStyleModifier *m;
-	int a;
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
 
-	new_linestyle = BKE_linestyle_new(bmain, linestyle->id.name + 2);
-	BKE_linestyle_free(new_linestyle);
-
-	for (a = 0; a < MAX_MTEX; a++) {
-		if (linestyle->mtex[a]) {
-			new_linestyle->mtex[a] = MEM_mallocN(sizeof(MTex), "BKE_linestyle_copy");
-			memcpy(new_linestyle->mtex[a], linestyle->mtex[a], sizeof(MTex));
-			id_us_plus((ID *)new_linestyle->mtex[a]->tex);
+	for (int a = 0; a < MAX_MTEX; a++) {
+		if (linestyle_src->mtex[a]) {
+			linestyle_dst->mtex[a] = MEM_mallocN(sizeof(*linestyle_dst->mtex[a]), __func__);
+			*linestyle_dst->mtex[a] = *linestyle_src->mtex[a];
 		}
 	}
-	if (linestyle->nodetree) {
-		new_linestyle->nodetree = ntreeCopyTree(bmain, linestyle->nodetree);
+	if (linestyle_src->nodetree) {
+		BKE_id_copy_ex(bmain, (ID *)linestyle_src->nodetree, (ID **)&linestyle_dst->nodetree, flag, false);
 	}
 
-	new_linestyle->r = linestyle->r;
-	new_linestyle->g = linestyle->g;
-	new_linestyle->b = linestyle->b;
-	new_linestyle->alpha = linestyle->alpha;
-	new_linestyle->thickness = linestyle->thickness;
-	new_linestyle->thickness_position = linestyle->thickness_position;
-	new_linestyle->thickness_ratio = linestyle->thickness_ratio;
-	new_linestyle->flag = linestyle->flag;
-	new_linestyle->caps = linestyle->caps;
-	new_linestyle->chaining = linestyle->chaining;
-	new_linestyle->rounds = linestyle->rounds;
-	new_linestyle->split_length = linestyle->split_length;
-	new_linestyle->min_angle = linestyle->min_angle;
-	new_linestyle->max_angle = linestyle->max_angle;
-	new_linestyle->min_length = linestyle->min_length;
-	new_linestyle->max_length = linestyle->max_length;
-	new_linestyle->chain_count = linestyle->chain_count;
-	new_linestyle->split_dash1 = linestyle->split_dash1;
-	new_linestyle->split_gap1 = linestyle->split_gap1;
-	new_linestyle->split_dash2 = linestyle->split_dash2;
-	new_linestyle->split_gap2 = linestyle->split_gap2;
-	new_linestyle->split_dash3 = linestyle->split_dash3;
-	new_linestyle->split_gap3 = linestyle->split_gap3;
-	new_linestyle->dash1 = linestyle->dash1;
-	new_linestyle->gap1 = linestyle->gap1;
-	new_linestyle->dash2 = linestyle->dash2;
-	new_linestyle->gap2 = linestyle->gap2;
-	new_linestyle->dash3 = linestyle->dash3;
-	new_linestyle->gap3 = linestyle->gap3;
-	new_linestyle->panel = linestyle->panel;
-	new_linestyle->sort_key = linestyle->sort_key;
-	new_linestyle->integration_type = linestyle->integration_type;
-	new_linestyle->texstep = linestyle->texstep;
-	new_linestyle->pr_texture = linestyle->pr_texture;
-	new_linestyle->use_nodes = linestyle->use_nodes;
-	for (m = (LineStyleModifier *)linestyle->color_modifiers.first; m; m = m->next)
-		BKE_linestyle_color_modifier_copy(new_linestyle, m);
-	for (m = (LineStyleModifier *)linestyle->alpha_modifiers.first; m; m = m->next)
-		BKE_linestyle_alpha_modifier_copy(new_linestyle, m);
-	for (m = (LineStyleModifier *)linestyle->thickness_modifiers.first; m; m = m->next)
-		BKE_linestyle_thickness_modifier_copy(new_linestyle, m);
-	for (m = (LineStyleModifier *)linestyle->geometry_modifiers.first; m; m = m->next)
-		BKE_linestyle_geometry_modifier_copy(new_linestyle, m);
-
-	BKE_id_copy_ensure_local(bmain, &linestyle->id, &new_linestyle->id);
-
-	return new_linestyle;
+	LineStyleModifier *m;
+	BLI_listbase_clear(&linestyle_dst->color_modifiers);
+	for (m = (LineStyleModifier *)linestyle_src->color_modifiers.first; m; m = m->next) {
+		BKE_linestyle_color_modifier_copy(linestyle_dst, m, flag_subdata);
+	}
+	BLI_listbase_clear(&linestyle_dst->alpha_modifiers);
+	for (m = (LineStyleModifier *)linestyle_src->alpha_modifiers.first; m; m = m->next) {
+		BKE_linestyle_alpha_modifier_copy(linestyle_dst, m, flag_subdata);
+	}
+	BLI_listbase_clear(&linestyle_dst->thickness_modifiers);
+	for (m = (LineStyleModifier *)linestyle_src->thickness_modifiers.first; m; m = m->next) {
+		BKE_linestyle_thickness_modifier_copy(linestyle_dst, m, flag_subdata);
+	}
+	BLI_listbase_clear(&linestyle_dst->geometry_modifiers);
+	for (m = (LineStyleModifier *)linestyle_src->geometry_modifiers.first; m; m = m->next) {
+		BKE_linestyle_geometry_modifier_copy(linestyle_dst, m, flag_subdata);
+	}
+}
+
+FreestyleLineStyle *BKE_linestyle_copy(struct Main *bmain, const FreestyleLineStyle *linestyle)
+{
+	FreestyleLineStyle *linestyle_copy;
+	BKE_id_copy_ex(bmain, &linestyle->id, (ID **)&linestyle_copy, 0, false);
+	return linestyle_copy;
 }
 
 void BKE_linestyle_make_local(struct Main *bmain, FreestyleLineStyle *linestyle, const bool lib_local)
@@ -355,7 +336,8 @@ LineStyleModifier *BKE_linestyle_color_modifier_add(FreestyleLineStyle *linestyl
 	return m;
 }
 
-LineStyleModifier *BKE_linestyle_color_modifier_copy(FreestyleLineStyle *linestyle, const LineStyleModifier *m)
+LineStyleModifier *BKE_linestyle_color_modifier_copy(
+        FreestyleLineStyle *linestyle, const LineStyleModifier *m, const int flag)
 {
 	LineStyleModifier *new_m;
 
@@ -388,9 +370,10 @@ LineStyleModifier *BKE_linestyle_color_modifier_copy(FreestyleLineStyle *linesty
 		{
 			LineStyleColorModifier_DistanceFromObject *p = (LineStyleColorModifier_DistanceFromObject *)m;
 			LineStyleColorModifier_DistanceFromObject *q = (LineStyleColorModifier_DistanceFromObject *)new_m;
-			if (p->target)
-				id_us_plus(&p->target->id);
 			q->target = p->target;
+			if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+				id_us_plus((ID *)q->target);
+			}
 			q->color_ramp = MEM_dupallocN(p->color_ramp);
 			q->range_min = p->range_min;
 			q->range_max = p->range_max;
@@ -594,7 +577,8 @@ LineStyleModifier *BKE_linestyle_alpha_modifier_add(FreestyleLineStyle *linestyl
 	return m;
 }
 
-LineStyleModifier *BKE_linestyle_alpha_modifier_copy(FreestyleLineStyle *linestyle, const LineStyleModifier *m)
+LineStyleModifier *BKE_linestyle_alpha_modifier_copy(
+        FreestyleLineStyle *linestyle, const LineStyleModifier *m, const int UNUSED(flag))
 {
 	LineStyleModifier *new_m;
 
@@ -863,7 +847,8 @@ LineStyleModifier *BKE_linestyle_thickness_modifier_add(FreestyleLineStyle *line
 	return m;
 }
 
-LineStyleModifier *BKE_linestyle_thickness_modifier_copy(FreestyleLineStyle *linestyle, const LineStyleModifier *m)
+LineStyleModifier *BKE_linestyle_thickness_modifier_copy(
+        FreestyleLineStyle *linestyle, const LineStyleModifier *m, const int flag)
 {
 	LineStyleModifier *new_m;
 
@@ -901,9 +886,10 @@ LineStyleModifier *BKE_linestyle_thickness_modifier_copy(FreestyleLineStyle *lin
 		{
 			LineStyleThicknessModifier_DistanceFromObject *p = (LineStyleThicknessModifier_DistanceFromObject *)m;
 			LineStyleThicknessModifier_DistanceFromObject *q = (LineStyleThicknessModifier_DistanceFromObject *)new_m;
-			if (p->target)
-				id_us_plus(&p->target->id);
 			q->target = p->target;
+			if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+				id_us_plus((ID *)q->target);
+			}
 			q->curve = curvemapping_copy(p->curve);
 			q->flags = p->flags;
 			q->range_min = p->range_min;
@@ -1195,7 +1181,8 @@ LineStyleModifier *BKE_linestyle_geometry_modifier_add(FreestyleLineStyle *lines
 	return m;
 }
 
-LineStyleModifier *BKE_linestyle_geometry_modifier_copy(FreestyleLineStyle *linestyle, const LineStyleModifier *m)
+LineStyleModifier *BKE_linestyle_geometry_modifier_copy(
+        FreestyleLineStyle *linestyle, const LineStyleModifier *m, const int UNUSED(flag))
 {
 	LineStyleModifier *new_m;
 
diff --git a/source/blender/blenkernel/intern/mask.c b/source/blender/blenkernel/intern/mask.c
index ae27e9bcd34..1e9447c4f09 100644
--- a/source/blender/blenkernel/intern/mask.c
+++ b/source/blender/blenkernel/intern/mask.c
@@ -61,6 +61,8 @@
 #include "BKE_movieclip.h"
 #include "BKE_image.h"
 
+#include "DEG_depsgraph_build.h"
+
 static struct {
 	ListBase splines;
 	struct GHash *id_hash;
@@ -794,7 +796,7 @@ static Mask *mask_alloc(Main *bmain, const char *name)
 {
 	Mask *mask;
 
-	mask = BKE_libblock_alloc(bmain, ID_MSK, name);
+	mask = BKE_libblock_alloc(bmain, ID_MSK, name, 0);
 
 	id_fake_user_set(&mask->id);
 
@@ -817,10 +819,13 @@ Mask *BKE_mask_new(Main *bmain, const char *name)
 	mask->sfra = 1;
 	mask->efra = 100;
 
+	DEG_relations_tag_update(bmain);
+
 	return mask;
 }
 
 /* TODO(sergey): Use generic BKE_libblock_copy_nolib() instead. */
+/* TODO(bastien): Use new super cool & generic BKE_id_copy_ex() instead! */
 Mask *BKE_mask_copy_nolib(Mask *mask)
 {
 	Mask *mask_new;
@@ -840,22 +845,29 @@ Mask *BKE_mask_copy_nolib(Mask *mask)
 	return mask_new;
 }
 
-Mask *BKE_mask_copy(Main *bmain, const Mask *mask)
+/**
+ * Only copy internal data of Mask ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_mask_copy_data(Main *UNUSED(bmain), Mask *mask_dst, const Mask *mask_src, const int UNUSED(flag))
 {
-	Mask *mask_new;
+	BLI_listbase_clear(&mask_dst->masklayers);
 
-	mask_new = BKE_libblock_copy(bmain, &mask->id);
-
-	BLI_listbase_clear(&mask_new->masklayers);
-
-	BKE_mask_layer_copy_list(&mask_new->masklayers, &mask->masklayers);
+	BKE_mask_layer_copy_list(&mask_dst->masklayers, &mask_src->masklayers);  /* TODO add unused flag to those as well. */
 
 	/* enable fake user by default */
-	id_fake_user_set(&mask_new->id);
-
-	BKE_id_copy_ensure_local(bmain, &mask->id, &mask_new->id);
+	id_fake_user_set(&mask_dst->id);
+}
 
-	return mask_new;
+Mask *BKE_mask_copy(Main *bmain, const Mask *mask)
+{
+	Mask *mask_copy;
+	BKE_id_copy_ex(bmain, &mask->id, (ID **)&mask_copy, 0, false);
+	return mask_copy;
 }
 
 void BKE_mask_make_local(Main *bmain, Mask *mask, const bool lib_local)
@@ -1171,17 +1183,6 @@ void BKE_mask_point_parent_matrix_get(MaskSplinePoint *point, float ctime, float
 	}
 }
 
-static void mask_evaluate_apply_point_parent(MaskSplinePoint *point, float ctime)
-{
-	float parent_matrix[3][3];
-
-	BKE_mask_point_parent_matrix_get(point, ctime, parent_matrix);
-
-	mul_m3_v2(parent_matrix, point->bezt.vec[0]);
-	mul_m3_v2(parent_matrix, point->bezt.vec[1]);
-	mul_m3_v2(parent_matrix, point->bezt.vec[2]);
-}
-
 static void mask_calc_point_handle(MaskSplinePoint *point, MaskSplinePoint *point_prev, MaskSplinePoint *point_next)
 {
 	BezTriple *bezt = &point->bezt;
@@ -1397,80 +1398,12 @@ void BKE_mask_spline_ensure_deform(MaskSpline *spline)
 
 void BKE_mask_layer_evaluate(MaskLayer *masklay, const float ctime, const bool do_newframe)
 {
-	/* animation if available */
+	/* Animation if available. */
 	if (do_newframe) {
-		MaskLayerShape *masklay_shape_a;
-		MaskLayerShape *masklay_shape_b;
-		int found;
-
-		if ((found = BKE_mask_layer_shape_find_frame_range(masklay, ctime,
-		                                                   &masklay_shape_a, &masklay_shape_b)))
-		{
-			if (found == 1) {
-#if 0
-				printf("%s: exact %d %d (%d)\n", __func__, (int)ctime, BLI_listbase_count(&masklay->splines_shapes),
-				       masklay_shape_a->frame);
-#endif
-
-				BKE_mask_layer_shape_to_mask(masklay, masklay_shape_a);
-			}
-			else if (found == 2) {
-				float w = masklay_shape_b->frame - masklay_shape_a->frame;
-#if 0
-				printf("%s: tween %d %d (%d %d)\n", __func__, (int)ctime, BLI_listbase_count(&masklay->splines_shapes),
-				       masklay_shape_a->frame, masklay_shape_b->frame);
-#endif
-				BKE_mask_layer_shape_to_mask_interp(masklay, masklay_shape_a, masklay_shape_b,
-				                                    (ctime - masklay_shape_a->frame) / w);
-			}
-			else {
-				/* always fail, should never happen */
-				BLI_assert(found == 2);
-			}
-		}
-	}
-	/* animation done... */
-
-	BKE_mask_layer_calc_handles(masklay);
-
-	/* update deform */
-	{
-		MaskSpline *spline;
-
-		for (spline = masklay->splines.first; spline; spline = spline->next) {
-			int i;
-			bool need_handle_recalc = false;
-
-			BKE_mask_spline_ensure_deform(spline);
-
-			for (i = 0; i < spline->tot_point; i++) {
-				MaskSplinePoint *point = &spline->points[i];
-				MaskSplinePoint *point_deform = &spline->points_deform[i];
-
-				BKE_mask_point_free(point_deform);
-
-				*point_deform = *point;
-				point_deform->uw = point->uw ? MEM_dupallocN(point->uw) : NULL;
-
-				mask_evaluate_apply_point_parent(point_deform, ctime);
-
-				if (ELEM(point->bezt.h1, HD_AUTO, HD_VECT)) {
-					need_handle_recalc = true;
-				}
-			}
-
-			/* if the spline has auto or vector handles, these need to be recalculated after deformation */
-			if (need_handle_recalc) {
-				for (i = 0; i < spline->tot_point; i++) {
-					MaskSplinePoint *point_deform = &spline->points_deform[i];
-					if (ELEM(point_deform->bezt.h1, HD_AUTO, HD_VECT)) {
-						BKE_mask_calc_handle_point(spline, point_deform);
-					}
-				}
-			}
-			/* end extra calc handles loop */
-		}
+		BKE_mask_layer_evaluate_animation(masklay, ctime);
 	}
+	/* Update deform. */
+	BKE_mask_layer_evaluate_deform(masklay, ctime);
 }
 
 void BKE_mask_evaluate(Mask *mask, const float ctime, const bool do_newframe)
diff --git a/source/blender/blenkernel/intern/mask_evaluate.c b/source/blender/blenkernel/intern/mask_evaluate.c
index 1b275f455f4..f60d87f2464 100644
--- a/source/blender/blenkernel/intern/mask_evaluate.c
+++ b/source/blender/blenkernel/intern/mask_evaluate.c
@@ -42,8 +42,11 @@
 #include "DNA_mask_types.h"
 
 #include "BKE_curve.h"
+#include "BKE_global.h"
 #include "BKE_mask.h"
 
+#include "DEG_depsgraph.h"
+
 
 unsigned int BKE_mask_spline_resolution(MaskSpline *spline, int width, int height)
 {
@@ -810,3 +813,111 @@ float *BKE_mask_point_segment_diff(MaskSpline *spline, MaskSplinePoint *point,
 
 	return diff_points;
 }
+
+static void mask_evaluate_apply_point_parent(MaskSplinePoint *point, float ctime)
+{
+	float parent_matrix[3][3];
+	BKE_mask_point_parent_matrix_get(point, ctime, parent_matrix);
+	mul_m3_v2(parent_matrix, point->bezt.vec[0]);
+	mul_m3_v2(parent_matrix, point->bezt.vec[1]);
+	mul_m3_v2(parent_matrix, point->bezt.vec[2]);
+}
+
+void BKE_mask_layer_evaluate_animation(MaskLayer *masklay, const float ctime)
+{
+	/* animation if available */
+	MaskLayerShape *masklay_shape_a;
+	MaskLayerShape *masklay_shape_b;
+	int found;
+	if ((found = BKE_mask_layer_shape_find_frame_range(
+	        masklay, ctime, &masklay_shape_a, &masklay_shape_b)))
+	{
+		if (found == 1) {
+#if 0
+			printf("%s: exact %d %d (%d)\n",
+			       __func__,
+			       (int)ctime,
+			       BLI_listbase_count(&masklay->splines_shapes),
+			       masklay_shape_a->frame);
+#endif
+			BKE_mask_layer_shape_to_mask(masklay, masklay_shape_a);
+		}
+		else if (found == 2) {
+			float w = masklay_shape_b->frame - masklay_shape_a->frame;
+#if 0
+			printf("%s: tween %d %d (%d %d)\n",
+			       __func__,
+			       (int)ctime,
+			       BLI_listbase_count(&masklay->splines_shapes),
+			       masklay_shape_a->frame, masklay_shape_b->frame);
+#endif
+			BKE_mask_layer_shape_to_mask_interp(
+			        masklay,
+			        masklay_shape_a, masklay_shape_b,
+			        (ctime - masklay_shape_a->frame) / w);
+		}
+		else {
+			/* always fail, should never happen */
+			BLI_assert(found == 2);
+		}
+	}
+}
+
+void BKE_mask_layer_evaluate_deform(MaskLayer *masklay, const float ctime)
+{
+	BKE_mask_layer_calc_handles(masklay);
+	for (MaskSpline *spline = masklay->splines.first;
+	     spline != NULL;
+	     spline = spline->next)
+	{
+		bool need_handle_recalc = false;
+		BKE_mask_spline_ensure_deform(spline);
+		for (int i = 0; i < spline->tot_point; i++) {
+			MaskSplinePoint *point = &spline->points[i];
+			MaskSplinePoint *point_deform = &spline->points_deform[i];
+			BKE_mask_point_free(point_deform);
+			*point_deform = *point;
+			point_deform->uw = point->uw ? MEM_dupallocN(point->uw) : NULL;
+			mask_evaluate_apply_point_parent(point_deform, ctime);
+			if (ELEM(point->bezt.h1, HD_AUTO, HD_VECT)) {
+				need_handle_recalc = true;
+			}
+		}
+		/* if the spline has auto or vector handles, these need to be
+		 * recalculated after deformation.
+		 */
+		if (need_handle_recalc) {
+			for (int i = 0; i < spline->tot_point; i++) {
+				MaskSplinePoint *point_deform = &spline->points_deform[i];
+				if (ELEM(point_deform->bezt.h1, HD_AUTO, HD_VECT)) {
+					BKE_mask_calc_handle_point(spline, point_deform);
+				}
+			}
+		}
+		/* end extra calc handles loop */
+	}
+}
+
+#define DEBUG_PRINT if (G.debug & G_DEBUG_DEPSGRAPH) printf
+
+void BKE_mask_eval_animation(struct EvaluationContext *eval_ctx, Mask *mask)
+{
+	DEBUG_PRINT("%s on %s (%p)\n", __func__, mask->id.name, mask);
+	for (MaskLayer *mask_layer = mask->masklayers.first;
+	     mask_layer != NULL;
+	     mask_layer = mask_layer->next)
+	{
+		BKE_mask_layer_evaluate_animation(mask_layer, eval_ctx->ctime);
+	}
+}
+
+void BKE_mask_eval_update(struct EvaluationContext *eval_ctx, Mask *mask)
+{
+	DEBUG_PRINT("%s on %s (%p)\n", __func__, mask->id.name, mask);
+	for (MaskLayer *mask_layer = mask->masklayers.first;
+	     mask_layer != NULL;
+	     mask_layer = mask_layer->next)
+	{
+		BKE_mask_layer_evaluate_deform(mask_layer, eval_ctx->ctime);
+	}
+}
diff --git a/source/blender/blenkernel/intern/material.c b/source/blender/blenkernel/intern/material.c
index 824151f9c98..3a742520471 100644
--- a/source/blender/blenkernel/intern/material.c
+++ b/source/blender/blenkernel/intern/material.c
@@ -207,59 +207,78 @@ void BKE_material_init(Material *ma)
 	ma->mode2 = MA_CASTSHADOW;
 	ma->shade_flag = MA_APPROX_OCCLUSION;
 	ma->preview = NULL;
+
+	ma->alpha_threshold = 0.5f;
 }
 
 Material *BKE_material_add(Main *bmain, const char *name)
 {
 	Material *ma;
 
-	ma = BKE_libblock_alloc(bmain, ID_MA, name);
+	ma = BKE_libblock_alloc(bmain, ID_MA, name, 0);
 	
 	BKE_material_init(ma);
 	
 	return ma;
 }
 
-/* XXX keep synced with next function */
-Material *BKE_material_copy(Main *bmain, const Material *ma)
+/**
+ * Only copy internal data of Material ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_material_copy_data(Main *bmain, Material *ma_dst, const Material *ma_src, const int flag)
 {
-	Material *man;
-	int a;
-	
-	man = BKE_libblock_copy(bmain, &ma->id);
-	
-	id_lib_extern((ID *)man->group);
-	id_lib_extern((ID *)man->edit_image);
-	
-	for (a = 0; a < MAX_MTEX; a++) {
-		if (ma->mtex[a]) {
-			man->mtex[a] = MEM_mallocN(sizeof(MTex), "copymaterial");
-			memcpy(man->mtex[a], ma->mtex[a], sizeof(MTex));
-			id_us_plus((ID *)man->mtex[a]->tex);
+	for (int a = 0; a < MAX_MTEX; a++) {
+		if (ma_src->mtex[a]) {
+			ma_dst->mtex[a] = MEM_mallocN(sizeof(*ma_dst->mtex[a]), __func__);
+			*ma_dst->mtex[a] = *ma_src->mtex[a];
 		}
 	}
-	
-	if (ma->ramp_col) man->ramp_col = MEM_dupallocN(ma->ramp_col);
-	if (ma->ramp_spec) man->ramp_spec = MEM_dupallocN(ma->ramp_spec);
-	
-	if (ma->nodetree) {
-		man->nodetree = ntreeCopyTree(bmain, ma->nodetree);
+
+	if (ma_src->ramp_col) {
+		ma_dst->ramp_col = MEM_dupallocN(ma_src->ramp_col);
+	}
+	if (ma_src->ramp_spec) {
+		ma_dst->ramp_spec = MEM_dupallocN(ma_src->ramp_spec);
 	}
 
-	BKE_previewimg_id_copy(&man->id, &ma->id);
+	if (ma_src->nodetree) {
+		BKE_id_copy_ex(bmain, (ID *)ma_src->nodetree, (ID **)&ma_dst->nodetree, flag, false);
+	}
 
-	BLI_listbase_clear(&man->gpumaterial);
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
+		BKE_previewimg_id_copy(&ma_dst->id, &ma_src->id);
+	}
+	else {
+		ma_dst->preview = NULL;
+	}
 
-	/* TODO Duplicate Engine Settings and set runtime to NULL */
+	BLI_listbase_clear(&ma_dst->gpumaterial);
 
-	BKE_id_copy_ensure_local(bmain, &ma->id, &man->id);
+	/* TODO Duplicate Engine Settings and set runtime to NULL */
+}
 
-	return man;
+Material *BKE_material_copy(Main *bmain, const Material *ma)
+{
+	Material *ma_copy;
+	BKE_id_copy_ex(bmain, &ma->id, (ID **)&ma_copy, 0, false);
+	return ma_copy;
 }
 
 /* XXX (see above) material copy without adding to main dbase */
 Material *localize_material(Material *ma)
 {
+	/* TODO replace with something like
+	 * 	Material *ma_copy;
+	 * 	BKE_id_copy_ex(bmain, &ma->id, (ID **)&ma_copy, LIB_ID_COPY_NO_MAIN | LIB_ID_COPY_NO_PREVIEW | LIB_ID_COPY_NO_USER_REFCOUNT, false);
+	 * 	return ma_copy;
+	 *
+	 * ... Once f*** nodes are fully converted to that too :( */
+
 	Material *man;
 	int a;
 	
@@ -349,6 +368,8 @@ Material ***give_matarar_id(ID *id)
 			return &(((Curve *)id)->mat);
 		case ID_MB:
 			return &(((MetaBall *)id)->mat);
+		default:
+			break;
 	}
 	return NULL;
 }
@@ -365,6 +386,8 @@ short *give_totcolp_id(ID *id)
 			return &(((Curve *)id)->totcol);
 		case ID_MB:
 			return &(((MetaBall *)id)->totcol);
+		default:
+			break;
 	}
 	return NULL;
 }
@@ -384,6 +407,8 @@ static void material_data_index_remove_id(ID *id, short index)
 		case ID_MB:
 			/* meta-elems don't have materials atm */
 			break;
+		default:
+			break;
 	}
 }
 
@@ -402,6 +427,8 @@ static void material_data_index_clear_id(ID *id)
 		case ID_MB:
 			/* meta-elems don't have materials atm */
 			break;
+		default:
+			break;
 	}
 }
 
@@ -1795,3 +1822,13 @@ bool BKE_object_material_edit_image_set(Object *ob, short mat_nr, Image *image)
 	}
 	return false;
 }
+
+void BKE_material_eval(const struct EvaluationContext *UNUSED(eval_ctx), Material *material)
+{
+	if (G.debug & G_DEBUG_DEPSGRAPH) {
+		printf("%s on %s (%p)\n", __func__, material->id.name, material);
+	}
+	if ((BLI_listbase_is_empty(&material->gpumaterial) == false)) {
+		GPU_material_uniform_buffer_tag_dirty(&material->gpumaterial);
+	}
+}
diff --git a/source/blender/blenkernel/intern/mball.c b/source/blender/blenkernel/intern/mball.c
index 27e2b17b4e2..f1e549b1400 100644
--- a/source/blender/blenkernel/intern/mball.c
+++ b/source/blender/blenkernel/intern/mball.c
@@ -97,33 +97,36 @@ MetaBall *BKE_mball_add(Main *bmain, const char *name)
 {
 	MetaBall *mb;
 
-	mb = BKE_libblock_alloc(bmain, ID_MB, name);
+	mb = BKE_libblock_alloc(bmain, ID_MB, name, 0);
 
 	BKE_mball_init(mb);
 
 	return mb;
 }
 
-MetaBall *BKE_mball_copy(Main *bmain, const MetaBall *mb)
+/**
+ * Only copy internal data of MetaBall ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_mball_copy_data(Main *UNUSED(bmain), MetaBall *mb_dst, const MetaBall *mb_src, const int UNUSED(flag))
 {
-	MetaBall *mbn;
-	int a;
-	
-	mbn = BKE_libblock_copy(bmain, &mb->id);
+	BLI_duplicatelist(&mb_dst->elems, &mb_src->elems);
 
-	BLI_duplicatelist(&mbn->elems, &mb->elems);
-	
-	mbn->mat = MEM_dupallocN(mb->mat);
-	for (a = 0; a < mbn->totcol; a++) {
-		id_us_plus((ID *)mbn->mat[a]);
-	}
+	mb_dst->mat = MEM_dupallocN(mb_src->mat);
 
-	mbn->editelems = NULL;
-	mbn->lastelem = NULL;
-	
-	BKE_id_copy_ensure_local(bmain, &mb->id, &mbn->id);
+	mb_dst->editelems = NULL;
+	mb_dst->lastelem = NULL;
+}
 
-	return mbn;
+MetaBall *BKE_mball_copy(Main *bmain, const MetaBall *mb)
+{
+	MetaBall *mb_copy;
+	BKE_id_copy_ex(bmain, &mb->id, (ID **)&mb_copy, 0, false);
+	return mb_copy;
 }
 
 void BKE_mball_make_local(Main *bmain, MetaBall *mb, const bool lib_local)
@@ -469,7 +472,7 @@ bool BKE_mball_center_bounds(MetaBall *mb, float r_cent[3])
 	return false;
 }
 
-void BKE_mball_transform(MetaBall *mb, float mat[4][4])
+void BKE_mball_transform(MetaBall *mb, float mat[4][4], const bool do_props)
 {
 	MetaElem *me;
 	float quat[4];
@@ -481,14 +484,17 @@ void BKE_mball_transform(MetaBall *mb, float mat[4][4])
 	for (me = mb->elems.first; me; me = me->next) {
 		mul_m4_v3(mat, &me->x);
 		mul_qt_qtqt(me->quat, quat, me->quat);
-		me->rad *= scale;
-		/* hrmf, probably elems shouldn't be
-		 * treating scale differently - campbell */
-		if (!MB_TYPE_SIZE_SQUARED(me->type)) {
-			mul_v3_fl(&me->expx, scale);
-		}
-		else {
-			mul_v3_fl(&me->expx, scale_sqrt);
+
+		if (do_props) {
+			me->rad *= scale;
+			/* hrmf, probably elems shouldn't be
+			 * treating scale differently - campbell */
+			if (!MB_TYPE_SIZE_SQUARED(me->type)) {
+				mul_v3_fl(&me->expx, scale);
+			}
+			else {
+				mul_v3_fl(&me->expx, scale_sqrt);
+			}
 		}
 	}
 }
@@ -532,7 +538,7 @@ void BKE_mball_select_swap(struct MetaBall *mb)
 
 /* **** Depsgraph evaluation **** */
 
-void BKE_mball_eval_geometry(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_mball_eval_geometry(const struct EvaluationContext *UNUSED(eval_ctx),
                              MetaBall *UNUSED(mball))
 {
 }
diff --git a/source/blender/blenkernel/intern/mball_tessellate.c b/source/blender/blenkernel/intern/mball_tessellate.c
index d897213d362..d8e3df239df 100644
--- a/source/blender/blenkernel/intern/mball_tessellate.c
+++ b/source/blender/blenkernel/intern/mball_tessellate.c
@@ -424,13 +424,13 @@ static void make_face(PROCESS *process, int i1, int i2, int i3, int i4)
 #ifdef USE_ACCUM_NORMAL
 	if (i4 == 0) {
 		normal_tri_v3(n, process->co[i1], process->co[i2], process->co[i3]);
-		accumulate_vertex_normals(
+		accumulate_vertex_normals_v3(
 		        process->no[i1], process->no[i2], process->no[i3], NULL, n,
 		        process->co[i1], process->co[i2], process->co[i3], NULL);
 	}
 	else {
 		normal_quad_v3(n, process->co[i1], process->co[i2], process->co[i3], process->co[i4]);
-		accumulate_vertex_normals(
+		accumulate_vertex_normals_v3(
 		        process->no[i1], process->no[i2], process->no[i3], process->no[i4], n,
 		        process->co[i1], process->co[i2], process->co[i3], process->co[i4]);
 	}
@@ -1079,7 +1079,7 @@ static void polygonize(PROCESS *process)
  * Iterates over ALL objects in the scene and all of its sets, including
  * making all duplis(not only metas). Copies metas to mainb array.
  * Computes bounding boxes for building BVH. */
-static void init_meta(EvaluationContext *eval_ctx, PROCESS *process, Scene *scene, Object *ob)
+static void init_meta(const EvaluationContext *eval_ctx, PROCESS *process, Scene *scene, Object *ob)
 {
 	Scene *sce_iter = scene;
 	BaseLegacy *base;
@@ -1256,7 +1256,7 @@ static void init_meta(EvaluationContext *eval_ctx, PROCESS *process, Scene *scen
 	}
 }
 
-void BKE_mball_polygonize(EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase)
+void BKE_mball_polygonize(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ListBase *dispbase)
 {
 	MetaBall *mb;
 	DispList *dl;
diff --git a/source/blender/blenkernel/intern/mesh.c b/source/blender/blenkernel/intern/mesh.c
index 9c0881e79ff..8f41f0611d4 100644
--- a/source/blender/blenkernel/intern/mesh.c
+++ b/source/blender/blenkernel/intern/mesh.c
@@ -387,6 +387,48 @@ void BKE_mesh_ensure_skin_customdata(Mesh *me)
 	}
 }
 
+bool BKE_mesh_ensure_facemap_customdata(struct Mesh *me)
+{
+	BMesh *bm = me->edit_btmesh ? me->edit_btmesh->bm : NULL;
+	bool changed = false;
+	if (bm) {
+		if (!CustomData_has_layer(&bm->pdata, CD_FACEMAP)) {
+			BM_data_layer_add(bm, &bm->pdata, CD_FACEMAP);
+			changed = true;
+		}
+	}
+	else {
+		if (!CustomData_has_layer(&me->pdata, CD_FACEMAP)) {
+			CustomData_add_layer(&me->pdata,
+			                          CD_FACEMAP,
+			                          CD_DEFAULT,
+			                          NULL,
+			                          me->totpoly);
+			changed = true;
+		}
+	}
+	return changed;
+}
+
+bool BKE_mesh_clear_facemap_customdata(struct Mesh *me)
+{
+	BMesh *bm = me->edit_btmesh ? me->edit_btmesh->bm : NULL;
+	bool changed = false;
+	if (bm) {
+		if (CustomData_has_layer(&bm->pdata, CD_FACEMAP)) {
+			BM_data_layer_free(bm, &bm->pdata, CD_FACEMAP);
+			changed = true;
+		}
+	}
+	else {
+		if (CustomData_has_layer(&me->pdata, CD_FACEMAP)) {
+			CustomData_free_layers(&me->pdata, CD_FACEMAP, me->totpoly);
+			changed = true;
+		}
+	}
+	return changed;
+}
+
 /* this ensures grouped customdata (e.g. mtexpoly and mloopuv and mtface, or
  * mloopcol and mcol) have the same relative active/render/clone/mask indices.
  *
@@ -491,54 +533,57 @@ Mesh *BKE_mesh_add(Main *bmain, const char *name)
 {
 	Mesh *me;
 
-	me = BKE_libblock_alloc(bmain, ID_ME, name);
+	me = BKE_libblock_alloc(bmain, ID_ME, name, 0);
 
 	BKE_mesh_init(me);
 
 	return me;
 }
 
-Mesh *BKE_mesh_copy(Main *bmain, const Mesh *me)
+/**
+ * Only copy internal data of Mesh ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_mesh_copy_data(Main *bmain, Mesh *me_dst, const Mesh *me_src, const int flag)
 {
-	Mesh *men;
-	int a;
-	const int do_tessface = ((me->totface != 0) && (me->totpoly == 0)); /* only do tessface if we have no polys */
-	
-	men = BKE_libblock_copy(bmain, &me->id);
-	
-	men->mat = MEM_dupallocN(me->mat);
-	for (a = 0; a < men->totcol; a++) {
-		id_us_plus((ID *)men->mat[a]);
-	}
-	id_us_plus((ID *)men->texcomesh);
+	const bool do_tessface = ((me_src->totface != 0) && (me_src->totpoly == 0)); /* only do tessface if we have no polys */
+
+	me_dst->mat = MEM_dupallocN(me_src->mat);
 
-	CustomData_copy(&me->vdata, &men->vdata, CD_MASK_MESH, CD_DUPLICATE, men->totvert);
-	CustomData_copy(&me->edata, &men->edata, CD_MASK_MESH, CD_DUPLICATE, men->totedge);
-	CustomData_copy(&me->ldata, &men->ldata, CD_MASK_MESH, CD_DUPLICATE, men->totloop);
-	CustomData_copy(&me->pdata, &men->pdata, CD_MASK_MESH, CD_DUPLICATE, men->totpoly);
+	CustomData_copy(&me_src->vdata, &me_dst->vdata, CD_MASK_MESH, CD_DUPLICATE, me_dst->totvert);
+	CustomData_copy(&me_src->edata, &me_dst->edata, CD_MASK_MESH, CD_DUPLICATE, me_dst->totedge);
+	CustomData_copy(&me_src->ldata, &me_dst->ldata, CD_MASK_MESH, CD_DUPLICATE, me_dst->totloop);
+	CustomData_copy(&me_src->pdata, &me_dst->pdata, CD_MASK_MESH, CD_DUPLICATE, me_dst->totpoly);
 	if (do_tessface) {
-		CustomData_copy(&me->fdata, &men->fdata, CD_MASK_MESH, CD_DUPLICATE, men->totface);
+		CustomData_copy(&me_src->fdata, &me_dst->fdata, CD_MASK_MESH, CD_DUPLICATE, me_dst->totface);
 	}
 	else {
-		mesh_tessface_clear_intern(men, false);
+		mesh_tessface_clear_intern(me_dst, false);
 	}
 
-	BKE_mesh_update_customdata_pointers(men, do_tessface);
+	BKE_mesh_update_customdata_pointers(me_dst, do_tessface);
 
-	men->edit_btmesh = NULL;
-	men->batch_cache = NULL;
+	me_dst->edit_btmesh = NULL;
+	me_dst->batch_cache = NULL;
 
-	men->mselect = MEM_dupallocN(men->mselect);
-	men->bb = MEM_dupallocN(men->bb);
+	me_dst->mselect = MEM_dupallocN(me_dst->mselect);
+	me_dst->bb = MEM_dupallocN(me_dst->bb);
 
-	if (me->key) {
-		men->key = BKE_key_copy(bmain, me->key);
-		men->key->from = (ID *)men;
+	/* TODO Do we want to add flag to prevent this? */
+	if (me_src->key) {
+		BKE_id_copy_ex(bmain, &me_src->key->id, (ID **)&me_dst->key, flag, false);
 	}
+}
 
-	BKE_id_copy_ensure_local(bmain, &me->id, &men->id);
-
-	return men;
+Mesh *BKE_mesh_copy(Main *bmain, const Mesh *me)
+{
+	Mesh *me_copy;
+	BKE_id_copy_ex(bmain, &me->id, (ID **)&me_copy, 0, false);
+	return me_copy;
 }
 
 BMesh *BKE_mesh_to_bmesh(
@@ -581,43 +626,44 @@ bool BKE_mesh_uv_cdlayer_rename_index(Mesh *me, const int poly_index, const int
 		ldata = &me->ldata;
 		fdata = &me->fdata;
 	}
-	cdlp = (poly_index != -1) ? &pdata->layers[poly_index] : NULL;
-	cdlu = &ldata->layers[loop_index];
-	cdlf = fdata && do_tessface ? &fdata->layers[face_index] : NULL;
 
-	if (cdlp == NULL && cdlf == NULL) {
-		return false;
-	}
+	cdlu = &ldata->layers[loop_index];
+	cdlp = (poly_index != -1) ? &pdata->layers[poly_index] : NULL;
+	cdlf = (face_index != -1) && fdata && do_tessface ? &fdata->layers[face_index] : NULL;
 
 	if (cdlu->name != new_name) {
 		/* Mesh validate passes a name from the CD layer as the new name,
 		 * Avoid memcpy from self to self in this case.
 		 */
 		BLI_strncpy(cdlu->name, new_name, sizeof(cdlu->name));
-		CustomData_set_layer_unique_name(pdata, cdlu - pdata->layers);
+		CustomData_set_layer_unique_name(ldata, loop_index);
+	}
+
+	if (cdlp == NULL && cdlf == NULL) {
+		return false;
 	}
 
 	/* Loop until we do have exactly the same name for all layers! */
 	for (i = 1;
-	     (cdlp && !STREQ(cdlp->name, cdlu->name)) ||
-	     (cdlf && !STREQ(cdlp->name, cdlf->name));
+	     (cdlp && !STREQ(cdlu->name, cdlp->name)) ||
+	     (cdlf && !STREQ(cdlu->name, cdlf->name));
 	     i++)
 	{
 		switch (i % step) {
 			case 0:
 				if (cdlp) {
 					BLI_strncpy(cdlp->name, cdlu->name, sizeof(cdlp->name));
-					CustomData_set_layer_unique_name(pdata, cdlp - pdata->layers);
+					CustomData_set_layer_unique_name(pdata, poly_index);
 				}
 				break;
 			case 1:
 				BLI_strncpy(cdlu->name, cdlp->name, sizeof(cdlu->name));
-				CustomData_set_layer_unique_name(ldata, cdlu - ldata->layers);
+				CustomData_set_layer_unique_name(ldata, loop_index);
 				break;
 			case 2:
 				if (cdlf) {
 					BLI_strncpy(cdlf->name, cdlu->name, sizeof(cdlf->name));
-					CustomData_set_layer_unique_name(fdata, cdlf - fdata->layers);
+					CustomData_set_layer_unique_name(fdata, face_index);
 				}
 				break;
 		}
@@ -1585,10 +1631,10 @@ void BKE_mesh_to_curve_nurblist(DerivedMesh *dm, ListBase *nurblist, const int e
 	}
 }
 
-void BKE_mesh_to_curve(Scene *scene, Object *ob)
+void BKE_mesh_to_curve(const EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
 	/* make new mesh data from the original copy */
-	DerivedMesh *dm = mesh_get_derived_final(scene, ob, CD_MASK_MESH);
+	DerivedMesh *dm = mesh_get_derived_final(eval_ctx, scene, ob, CD_MASK_MESH);
 	ListBase nurblist = {NULL, NULL};
 	bool needsFree = false;
 
@@ -2053,6 +2099,12 @@ void BKE_mesh_mselect_active_set(Mesh *me, int index, int type)
 	           (me->mselect[me->totselect - 1].type  == type));
 }
 
+/**
+ * Compute 'split' (aka loop, or per face corner's) normals.
+ *
+ * \param r_lnors_spacearr Allows to get computed loop normal space array. That data, among other things,
+ *                         contains 'smooth fan' info, useful e.g. to split geometry along sharp edges...
+ */
 void BKE_mesh_calc_normals_split_ex(Mesh *mesh, MLoopNorSpaceArray *r_lnors_spacearr)
 {
 	float (*r_loopnors)[3];
@@ -2060,6 +2112,11 @@ void BKE_mesh_calc_normals_split_ex(Mesh *mesh, MLoopNorSpaceArray *r_lnors_spac
 	short (*clnors)[2] = NULL;
 	bool free_polynors = false;
 
+	/* Note that we enforce computing clnors when the clnor space array is requested by caller here.
+	 * However, we obviously only use the autosmooth angle threshold only in case autosmooth is enabled. */
+	const bool use_split_normals = (r_lnors_spacearr != NULL) || ((mesh->flag & ME_AUTOSMOOTH) != 0);
+	const float split_angle = (mesh->flag & ME_AUTOSMOOTH) != 0 ? mesh->smoothresh : (float)M_PI;
+
 	if (CustomData_has_layer(&mesh->ldata, CD_NORMAL)) {
 		r_loopnors = CustomData_get_layer(&mesh->ldata, CD_NORMAL);
 		memset(r_loopnors, 0, sizeof(float[3]) * mesh->totloop);
@@ -2088,7 +2145,7 @@ void BKE_mesh_calc_normals_split_ex(Mesh *mesh, MLoopNorSpaceArray *r_lnors_spac
 	BKE_mesh_normals_loop_split(
 	        mesh->mvert, mesh->totvert, mesh->medge, mesh->totedge,
 	        mesh->mloop, r_loopnors, mesh->totloop, mesh->mpoly, (const float (*)[3])polynors, mesh->totpoly,
-	        (mesh->flag & ME_AUTOSMOOTH) != 0, mesh->smoothresh, r_lnors_spacearr, clnors, NULL);
+	        use_split_normals, split_angle, r_lnors_spacearr, clnors, NULL);
 
 	if (free_polynors) {
 		MEM_freeN(polynors);
@@ -2120,118 +2177,70 @@ typedef struct SplitFaceNewEdge {
 /* Detect needed new vertices, and update accordingly loops' vertex indices.
  * WARNING! Leaves mesh in invalid state. */
 static int split_faces_prepare_new_verts(
-        const Mesh *mesh, MLoopNorSpaceArray *lnors_spacearr, SplitFaceNewVert **new_verts, MemArena *memarena,
-        bool *r_need_vnors_recalc)
+        const Mesh *mesh, MLoopNorSpaceArray *lnors_spacearr, SplitFaceNewVert **new_verts, MemArena *memarena)
 {
-	/* Note: if lnors_spacearr is NULL, ther is no autosmooth handling, and we only split out flat polys. */
+	/* This is now mandatory, trying to do the job in simple way without that data is doomed to fail, even when only
+	 * dealing with smooth/flat faces one can find cases that no simple algorithm can handle properly. */
+	BLI_assert(lnors_spacearr != NULL);
+
 	const int num_loops = mesh->totloop;
 	int num_verts = mesh->totvert;
 	MVert *mvert = mesh->mvert;
 	MLoop *mloop = mesh->mloop;
 
 	BLI_bitmap *verts_used = BLI_BITMAP_NEW(num_verts, __func__);
+	BLI_bitmap *done_loops = BLI_BITMAP_NEW(num_loops, __func__);
 
-	if (lnors_spacearr) {
-		BLI_bitmap *done_loops = BLI_BITMAP_NEW(num_loops, __func__);
-
-		MLoop *ml = mloop;
-		MLoopNorSpace **lnor_space = lnors_spacearr->lspacearr;
-		for (int loop_idx = 0; loop_idx < num_loops; loop_idx++, ml++, lnor_space++) {
-			if (!BLI_BITMAP_TEST(done_loops, loop_idx)) {
-				const int vert_idx = ml->v;
-				const bool vert_used = BLI_BITMAP_TEST_BOOL(verts_used, vert_idx);
-				/* If vert is already used by another smooth fan, we need a new vert for this one. */
-				const int new_vert_idx = vert_used ? num_verts++ : vert_idx;
-
-				BLI_assert(*lnor_space);
-
-				if ((*lnor_space)->loops) {
-					for (LinkNode *lnode = (*lnor_space)->loops; lnode; lnode = lnode->next) {
-						const int ml_fan_idx = GET_INT_FROM_POINTER(lnode->link);
-						BLI_BITMAP_ENABLE(done_loops, ml_fan_idx);
-						if (vert_used) {
-							mloop[ml_fan_idx].v = new_vert_idx;
-						}
-					}
-				}
-				else {
-					/* Single loop in this fan... */
-					BLI_BITMAP_ENABLE(done_loops, loop_idx);
+	MLoop *ml = mloop;
+	MLoopNorSpace **lnor_space = lnors_spacearr->lspacearr;
+
+	for (int loop_idx = 0; loop_idx < num_loops; loop_idx++, ml++, lnor_space++) {
+		if (!BLI_BITMAP_TEST(done_loops, loop_idx)) {
+			const int vert_idx = ml->v;
+			const bool vert_used = BLI_BITMAP_TEST_BOOL(verts_used, vert_idx);
+			/* If vert is already used by another smooth fan, we need a new vert for this one. */
+			const int new_vert_idx = vert_used ? num_verts++ : vert_idx;
+
+			BLI_assert(*lnor_space);
+
+			if ((*lnor_space)->loops) {
+				for (LinkNode *lnode = (*lnor_space)->loops; lnode; lnode = lnode->next) {
+					const int ml_fan_idx = GET_INT_FROM_POINTER(lnode->link);
+					BLI_BITMAP_ENABLE(done_loops, ml_fan_idx);
 					if (vert_used) {
-						ml->v = new_vert_idx;
+						mloop[ml_fan_idx].v = new_vert_idx;
 					}
 				}
-
-				if (!vert_used) {
-					BLI_BITMAP_ENABLE(verts_used, vert_idx);
-					/* We need to update that vertex's normal here, we won't go over it again. */
-					/* This is important! *DO NOT* set vnor to final computed lnor, vnor should always be defined to
-					 * 'automatic normal' value computed from its polys, not some custom normal.
-					 * Fortunately, that's the loop normal space's 'lnor' reference vector. ;) */
-					normal_float_to_short_v3(mvert[vert_idx].no, (*lnor_space)->vec_lnor);
-				}
-				else {
-					/* Add new vert to list. */
-					SplitFaceNewVert *new_vert = BLI_memarena_alloc(memarena, sizeof(*new_vert));
-					new_vert->orig_index = vert_idx;
-					new_vert->new_index = new_vert_idx;
-					new_vert->vnor = (*lnor_space)->vec_lnor;  /* See note above. */
-					new_vert->next = *new_verts;
-					*new_verts = new_vert;
-				}
 			}
-		}
-
-		MEM_freeN(done_loops);
-	}
-	else {
-		/* No loop normal spaces available, we only split out flat polys. */
-		const int num_polys = mesh->totpoly;
-		const MPoly *mpoly = mesh->mpoly;
-
-		/* We do that in two loops, to keep original edges/verts to smooth polys preferencially. */
-		const MPoly *mp = mpoly;
-		for (int i = 0; i < num_polys; i++, mp++) {
-			if (mp->flag & ME_SMOOTH) {
-				const MLoop *ml = &mloop[mp->loopstart];
-				for (int j = 0; j < mp->totloop; j++, ml++) {
-					/* Just mark the vertex as used/reserved, that way neighbor flat polys, if any,
-					 * will have to create their own. */
-					BLI_BITMAP_ENABLE(verts_used, ml->v);
+			else {
+				/* Single loop in this fan... */
+				BLI_BITMAP_ENABLE(done_loops, loop_idx);
+				if (vert_used) {
+					ml->v = new_vert_idx;
 				}
 			}
-		}
 
-		mp = mpoly;
-		for (int i = 0; i < num_polys; i++, mp++) {
-			if (!(mp->flag & ME_SMOOTH)) {
-				MLoop *ml = &mloop[mp->loopstart];
-				for (int j = 0; j < mp->totloop; j++, ml++) {
-					const int vert_idx = ml->v;
-
-					if (BLI_BITMAP_TEST(verts_used, vert_idx)) {
-						/* Add new vert to list. */
-						const int new_vert_idx = num_verts++;
-						ml->v = new_vert_idx;
-
-						SplitFaceNewVert *new_vert = BLI_memarena_alloc(memarena, sizeof(*new_vert));
-						new_vert->orig_index = vert_idx;
-						new_vert->new_index = new_vert_idx;
-						new_vert->vnor = NULL;  /* See note below about normals. */
-						new_vert->next = *new_verts;
-						*new_verts = new_vert;
-					}
-					else {
-						BLI_BITMAP_ENABLE(verts_used, vert_idx);
-					}
-				}
-				/* Note: there is no way to get new normals for smooth vertices here (and we don't have direct access
-				 * to poly normals either for flat ones), so we'll have to recompute all vnors at the end... */
-				*r_need_vnors_recalc = true;
+			if (!vert_used) {
+				BLI_BITMAP_ENABLE(verts_used, vert_idx);
+				/* We need to update that vertex's normal here, we won't go over it again. */
+				/* This is important! *DO NOT* set vnor to final computed lnor, vnor should always be defined to
+				 * 'automatic normal' value computed from its polys, not some custom normal.
+				 * Fortunately, that's the loop normal space's 'lnor' reference vector. ;) */
+				normal_float_to_short_v3(mvert[vert_idx].no, (*lnor_space)->vec_lnor);
+			}
+			else {
+				/* Add new vert to list. */
+				SplitFaceNewVert *new_vert = BLI_memarena_alloc(memarena, sizeof(*new_vert));
+				new_vert->orig_index = vert_idx;
+				new_vert->new_index = new_vert_idx;
+				new_vert->vnor = (*lnor_space)->vec_lnor;  /* See note above. */
+				new_vert->next = *new_verts;
+				*new_verts = new_vert;
 			}
 		}
 	}
 
+	MEM_freeN(done_loops);
 	MEM_freeN(verts_used);
 
 	return num_verts - mesh->totvert;
@@ -2350,27 +2359,17 @@ void BKE_mesh_split_faces(Mesh *mesh, bool free_loop_normals)
 	}
 	BKE_mesh_tessface_clear(mesh);
 
-	MLoopNorSpaceArray *lnors_spacearr = NULL;
-	MemArena *memarena;
-	bool need_vnors_recalc = false;
-
-	if (mesh->flag & ME_AUTOSMOOTH) {
-		lnors_spacearr = MEM_callocN(sizeof(*lnors_spacearr), __func__);
-		/* Compute loop normals and loop normal spaces (a.k.a. smooth fans of faces around vertices). */
-		BKE_mesh_calc_normals_split_ex(mesh, lnors_spacearr);
-		/* Stealing memarena from loop normals space array. */
-		memarena = lnors_spacearr->mem;
-	}
-	else {
-		/* We still have to split out flat faces... */
-		memarena = BLI_memarena_new(BLI_MEMARENA_STD_BUFSIZE, __func__);
-	}
+	MLoopNorSpaceArray lnors_spacearr = {NULL};
+	/* Compute loop normals and loop normal spaces (a.k.a. smooth fans of faces around vertices). */
+	BKE_mesh_calc_normals_split_ex(mesh, &lnors_spacearr);
+	/* Stealing memarena from loop normals space array. */
+	MemArena *memarena = lnors_spacearr.mem;
 
 	SplitFaceNewVert *new_verts = NULL;
 	SplitFaceNewEdge *new_edges = NULL;
 
 	/* Detect loop normal spaces (a.k.a. smooth fans) that will need a new vert. */
-	const int num_new_verts = split_faces_prepare_new_verts(mesh, lnors_spacearr, &new_verts, memarena, &need_vnors_recalc);
+	const int num_new_verts = split_faces_prepare_new_verts(mesh, &lnors_spacearr, &new_verts, memarena);
 
 	if (num_new_verts > 0) {
 		/* Reminder: beyond this point, there is no way out, mesh is in invalid state (due to early-reassignment of
@@ -2382,9 +2381,9 @@ void BKE_mesh_split_faces(Mesh *mesh, bool free_loop_normals)
 
 		/* Reallocate all vert and edge related data. */
 		mesh->totvert += num_new_verts;
-		mesh->totedge += num_new_edges;
 		CustomData_realloc(&mesh->vdata, mesh->totvert);
 		if (do_edges) {
+			mesh->totedge += num_new_edges;
 			CustomData_realloc(&mesh->edata, mesh->totedge);
 		}
 		/* Update pointers to a newly allocated memory. */
@@ -2404,18 +2403,9 @@ void BKE_mesh_split_faces(Mesh *mesh, bool free_loop_normals)
 		CustomData_free_layers(&mesh->ldata, CD_NORMAL, mesh->totloop);
 	}
 
-	if (lnors_spacearr) {
-		/* Also frees new_verts/edges temp data, since we used its memarena to allocate them. */
-		BKE_lnor_spacearr_free(lnors_spacearr);
-		MEM_freeN(lnors_spacearr);
-	}
-	else {
-		BLI_memarena_free(memarena);
-	}
+	/* Also frees new_verts/edges temp data, since we used its memarena to allocate them. */
+	BKE_lnor_spacearr_free(&lnors_spacearr);
 
-	if (need_vnors_recalc) {
-		BKE_mesh_calc_normals(mesh);
-	}
 #ifdef VALIDATE_MESH
 	BKE_mesh_validate(mesh, true, true);
 #endif
@@ -2423,7 +2413,7 @@ void BKE_mesh_split_faces(Mesh *mesh, bool free_loop_normals)
 
 /* settings: 1 - preview, 2 - render */
 Mesh *BKE_mesh_new_from_object(
-        Main *bmain, Scene *sce, Object *ob,
+        const EvaluationContext *eval_ctx, Main *bmain, Scene *sce, Object *ob,
         int apply_modifiers, int settings, int calc_tessface, int calc_undeformed)
 {
 	Mesh *tmpmesh;
@@ -2444,7 +2434,9 @@ Mesh *BKE_mesh_new_from_object(
 			int uv_from_orco;
 
 			/* copies object and modifiers (but not the data) */
-			Object *tmpobj = BKE_object_copy_ex(bmain, ob, true);
+			Object *tmpobj;
+			/* TODO: make it temp copy outside bmain! */
+			BKE_id_copy_ex(bmain, &ob->id, (ID **)&tmpobj, LIB_ID_COPY_CACHES, false);
 			tmpcu = (Curve *)tmpobj->data;
 			id_us_min(&tmpcu->id);
 
@@ -2475,7 +2467,7 @@ Mesh *BKE_mesh_new_from_object(
 			copycu->editnurb = tmpcu->editnurb;
 
 			/* get updated display list, and convert to a mesh */
-			BKE_displist_make_curveTypes_forRender(sce, tmpobj, &dispbase, &derivedFinal, false, render);
+			BKE_displist_make_curveTypes_forRender(eval_ctx, sce, tmpobj, &dispbase, &derivedFinal, false, render);
 
 			copycu->editfont = NULL;
 			copycu->editnurb = NULL;
@@ -2526,13 +2518,7 @@ Mesh *BKE_mesh_new_from_object(
 
 			if (render) {
 				ListBase disp = {NULL, NULL};
-				/* TODO(sergey): This is gonna to work for until EvaluationContext
-				 *               only contains for_render flag. As soon as CoW is
-				 *               implemented, this is to be rethinked.
-				 */
-				EvaluationContext eval_ctx;
-				DEG_evaluation_context_init(&eval_ctx, DAG_EVAL_RENDER);
-				BKE_displist_make_mball_forRender(&eval_ctx, sce, ob, &disp);
+				BKE_displist_make_mball_forRender(eval_ctx, sce, ob, &disp);
 				BKE_mesh_from_metaball(&disp, tmpmesh);
 				BKE_displist_free(&disp);
 			}
@@ -2571,9 +2557,9 @@ Mesh *BKE_mesh_new_from_object(
 
 				/* Write the display mesh into the dummy mesh */
 				if (render)
-					dm = mesh_create_derived_render(sce, ob, mask);
+					dm = mesh_create_derived_render(eval_ctx, sce, ob, mask);
 				else
-					dm = mesh_create_derived_view(sce, ob, mask);
+					dm = mesh_create_derived_view(eval_ctx, sce, ob, mask);
 
 				tmpmesh = BKE_mesh_add(bmain, ((ID *)ob->data)->name + 2);
 				DM_to_mesh(dm, tmpmesh, ob, mask, true);
@@ -2664,7 +2650,7 @@ Mesh *BKE_mesh_new_from_object(
 
 /* **** Depsgraph evaluation **** */
 
-void BKE_mesh_eval_geometry(EvaluationContext *UNUSED(eval_ctx),
+void BKE_mesh_eval_geometry(const EvaluationContext *UNUSED(eval_ctx),
                             Mesh *mesh)
 {
 	if (G.debug & G_DEBUG_DEPSGRAPH) {
@@ -2690,4 +2676,4 @@ void BKE_mesh_batch_cache_free(Mesh *me)
 	if (me->batch_cache) {
 		BKE_mesh_batch_cache_free_cb(me);
 	}
-}
\ No newline at end of file
+}
diff --git a/source/blender/blenkernel/intern/mesh_evaluate.c b/source/blender/blenkernel/intern/mesh_evaluate.c
index ca8b58ffae3..4a1952c798b 100644
--- a/source/blender/blenkernel/intern/mesh_evaluate.c
+++ b/source/blender/blenkernel/intern/mesh_evaluate.c
@@ -225,7 +225,7 @@ static void mesh_calc_normals_poly_accum_task_cb(void *userdata, const int pidx)
 	}
 
 	/* accumulate angle weighted face normal */
-	/* inline version of #accumulate_vertex_normals_poly */
+	/* inline version of #accumulate_vertex_normals_poly_v3 */
 	{
 		const float *prev_edge = edgevecbuf[nverts - 1];
 
@@ -334,8 +334,9 @@ void BKE_mesh_calc_normals_tessface(
 		else
 			normal_tri_v3(f_no, mverts[mf->v1].co, mverts[mf->v2].co, mverts[mf->v3].co);
 
-		accumulate_vertex_normals(tnorms[mf->v1], tnorms[mf->v2], tnorms[mf->v3], n4,
-		                          f_no, mverts[mf->v1].co, mverts[mf->v2].co, mverts[mf->v3].co, c4);
+		accumulate_vertex_normals_v3(
+		        tnorms[mf->v1], tnorms[mf->v2], tnorms[mf->v3], n4,
+		        f_no, mverts[mf->v1].co, mverts[mf->v2].co, mverts[mf->v3].co, c4);
 	}
 
 	/* following Mesh convention; we use vertex coordinate itself for normal in this case */
@@ -379,7 +380,7 @@ void BKE_mesh_calc_normals_looptri(
 		        f_no,
 		        mverts[vtri[0]].co, mverts[vtri[1]].co, mverts[vtri[2]].co);
 
-		accumulate_vertex_normals_tri(
+		accumulate_vertex_normals_tri_v3(
 		        tnorms[vtri[0]], tnorms[vtri[1]], tnorms[vtri[2]],
 		        f_no, mverts[vtri[0]].co, mverts[vtri[1]].co, mverts[vtri[2]].co);
 	}
@@ -845,7 +846,7 @@ static void split_loop_nor_fan_do(LoopSplitTaskDataCommon *common_data, LoopSpli
 //		printf("\thandling edge %d / loop %d\n", mlfan_curr->e, mlfan_curr_index);
 
 		{
-			/* Code similar to accumulate_vertex_normals_poly. */
+			/* Code similar to accumulate_vertex_normals_poly_v3. */
 			/* Calculate angle between the two poly edges incident on this vertex. */
 			const float fac = saacos(dot_v3v3(vec_curr, vec_prev));
 			/* Accumulate */
@@ -1856,11 +1857,14 @@ float BKE_mesh_calc_poly_area(
  * - http://forums.cgsociety.org/archive/index.php?t-756235.html
  * - http://www.globalspec.com/reference/52702/203279/4-8-the-centroid-of-a-tetrahedron
  *
- * \note volume is 6x actual volume, and centroid is 4x actual volume-weighted centroid
- * (so division can be done once at the end)
- * \note results will have bias if polygon is non-planar.
+ * \note
+ * - Volume is 6x actual volume, and centroid is 4x actual volume-weighted centroid
+ *   (so division can be done once at the end).
+ * - Results will have bias if polygon is non-planar.
+ * - The resulting volume will only be correct if the mesh is manifold and has consistent face winding
+ *   (non-contiguous face normals or holes in the mesh surface).
  */
-static float mesh_calc_poly_volume_and_weighted_centroid(
+static float mesh_calc_poly_volume_centroid(
         const MPoly *mpoly, const MLoop *loopstart, const MVert *mvarray,
         float r_cent[3])
 {
@@ -1897,6 +1901,43 @@ static float mesh_calc_poly_volume_and_weighted_centroid(
 	return total_volume;
 }
 
+/**
+ * \note
+ * - Results won't be correct if polygon is non-planar.
+ * - This has the advantage over #mesh_calc_poly_volume_centroid
+ *   that it doesn't depend on solid geometry, instead it weights the surface by volume.
+ */
+static float mesh_calc_poly_area_centroid(
+        const MPoly *mpoly, const MLoop *loopstart, const MVert *mvarray,
+        float r_cent[3])
+{
+	int i;
+	float tri_area;
+	float total_area = 0.0f;
+	float v1[3], v2[3], v3[3], normal[3], tri_cent[3];
+
+	BKE_mesh_calc_poly_normal(mpoly, loopstart, mvarray, normal);
+	copy_v3_v3(v1, mvarray[loopstart[0].v].co);
+	copy_v3_v3(v2, mvarray[loopstart[1].v].co);
+	zero_v3(r_cent);
+
+	for (i = 2; i < mpoly->totloop; i++) {
+		copy_v3_v3(v3, mvarray[loopstart[i].v].co);
+
+		tri_area = area_tri_signed_v3(v1, v2, v3, normal);
+		total_area += tri_area;
+
+		mid_v3_v3v3v3(tri_cent, v1, v2, v3);
+		madd_v3_v3fl(r_cent, tri_cent, tri_area);
+
+		copy_v3_v3(v2, v3);
+	}
+
+	mul_v3_fl(r_cent, 1.0f / total_area);
+
+	return total_area;
+}
+
 #if 0 /* slow version of the function below */
 void BKE_mesh_calc_poly_angles(MPoly *mpoly, MLoop *loopstart,
                                MVert *mvarray, float angles[])
@@ -2011,7 +2052,40 @@ bool BKE_mesh_center_bounds(const Mesh *me, float r_cent[3])
 	return false;
 }
 
-bool BKE_mesh_center_centroid(const Mesh *me, float r_cent[3])
+bool BKE_mesh_center_of_surface(const Mesh *me, float r_cent[3])
+{
+	int i = me->totpoly;
+	MPoly *mpoly;
+	float poly_area;
+	float total_area = 0.0f;
+	float poly_cent[3];
+
+	zero_v3(r_cent);
+
+	/* calculate a weighted average of polygon centroids */
+	for (mpoly = me->mpoly; i--; mpoly++) {
+		poly_area = mesh_calc_poly_area_centroid(mpoly, me->mloop + mpoly->loopstart, me->mvert, poly_cent);
+
+		madd_v3_v3fl(r_cent, poly_cent, poly_area);
+		total_area += poly_area;
+	}
+	/* otherwise we get NAN for 0 polys */
+	if (me->totpoly) {
+		mul_v3_fl(r_cent, 1.0f / total_area);
+	}
+
+	/* zero area faces cause this, fallback to median */
+	if (UNLIKELY(!is_finite_v3(r_cent))) {
+		return BKE_mesh_center_median(me, r_cent);
+	}
+
+	return (me->totpoly != 0);
+}
+
+/**
+ * \note Mesh must be manifold with consistent face-winding, see #mesh_calc_poly_volume_centroid for details.
+ */
+bool BKE_mesh_center_of_volume(const Mesh *me, float r_cent[3])
 {
 	int i = me->totpoly;
 	MPoly *mpoly;
@@ -2023,7 +2097,7 @@ bool BKE_mesh_center_centroid(const Mesh *me, float r_cent[3])
 
 	/* calculate a weighted average of polyhedron centroids */
 	for (mpoly = me->mpoly; i--; mpoly++) {
-		poly_volume = mesh_calc_poly_volume_and_weighted_centroid(mpoly, me->mloop + mpoly->loopstart, me->mvert, poly_cent);
+		poly_volume = mesh_calc_poly_volume_centroid(mpoly, me->mloop + mpoly->loopstart, me->mvert, poly_cent);
 
 		/* poly_cent is already volume-weighted, so no need to multiply by the volume */
 		add_v3_v3(r_cent, poly_cent);
@@ -2043,6 +2117,7 @@ bool BKE_mesh_center_centroid(const Mesh *me, float r_cent[3])
 
 	return (me->totpoly != 0);
 }
+
 /** \} */
 
 
diff --git a/source/blender/blenkernel/intern/mesh_remap.c b/source/blender/blenkernel/intern/mesh_remap.c
index c5fa9b15896..d2fe8f27f4a 100644
--- a/source/blender/blenkernel/intern/mesh_remap.c
+++ b/source/blender/blenkernel/intern/mesh_remap.c
@@ -1184,7 +1184,6 @@ void BKE_mesh_remap_calc_loops_from_dm(
 		bool polys_allocated_src;
 		MPoly *polys_src = DM_get_poly_array(dm_src, &polys_allocated_src);
 		const int num_polys_src = dm_src->getNumPolys(dm_src);
-		bool looptri_allocated_src = false;
 		const MLoopTri *looptri_src = NULL;
 		int num_looptri_src = 0;
 
@@ -1374,17 +1373,11 @@ void BKE_mesh_remap_calc_loops_from_dm(
 				if (dirty_tess_flag) {
 					dm_src->dirty &= ~dirty_tess_flag;
 				}
-				DM_ensure_looptri(dm_src);
 				if (dirty_tess_flag) {
 					dm_src->dirty |= dirty_tess_flag;
 				}
 
-				looptri_src = DM_get_looptri_array(
-				        dm_src,
-				        verts_src,
-				        polys_src, num_polys_src,
-				        loops_src, num_loops_src,
-				        &looptri_allocated_src);
+				looptri_src = dm_src->getLoopTriArray(dm_src);
 				num_looptri_src = dm_src->getNumLoopTri(dm_src);
 				looptri_active = BLI_BITMAP_NEW((size_t)num_looptri_src, __func__);
 
@@ -1403,7 +1396,7 @@ void BKE_mesh_remap_calc_loops_from_dm(
 					        &treedata[tindex],
 					        verts_src, verts_allocated_src,
 					        loops_src, loops_allocated_src,
-					        looptri_src, num_looptri_src, looptri_allocated_src,
+					        looptri_src, num_looptri_src, false,
 					        looptri_active, num_looptri_active, bvh_epsilon, 2, 6);
 					if (verts_allocated_src) {
 						verts_allocated_src = false;  /* Only 'give' our verts once, to first tree! */
@@ -1411,9 +1404,6 @@ void BKE_mesh_remap_calc_loops_from_dm(
 					if (loops_allocated_src) {
 						loops_allocated_src = false;  /* Only 'give' our loops once, to first tree! */
 					}
-					if (looptri_allocated_src) {
-						looptri_allocated_src = false;  /* Only 'give' our looptri once, to first tree! */
-					}
 				}
 
 				MEM_freeN(looptri_active);
@@ -1928,9 +1918,6 @@ void BKE_mesh_remap_calc_loops_from_dm(
 		if (polys_allocated_src) {
 			MEM_freeN(polys_src);
 		}
-		if (looptri_allocated_src) {
-			MEM_freeN((void *)looptri_src);
-		}
 		if (vert_to_loop_map_src) {
 			MEM_freeN(vert_to_loop_map_src);
 		}
diff --git a/source/blender/blenkernel/intern/mesh_tangent.c b/source/blender/blenkernel/intern/mesh_tangent.c
index b9d1025d7b1..77288bd672e 100644
--- a/source/blender/blenkernel/intern/mesh_tangent.c
+++ b/source/blender/blenkernel/intern/mesh_tangent.c
@@ -230,8 +230,6 @@ typedef struct {
 } SGLSLMeshToTangent;
 
 /* interface */
-#include "mikktspace.h"
-
 static int dm_ts_GetNumFaces(const SMikkTSpaceContext *pContext)
 {
 	SGLSLMeshToTangent *pMesh = pContext->m_pUserData;
@@ -474,7 +472,7 @@ void BKE_mesh_calc_loop_tangent_step_0(
         const CustomData *loopData, bool calc_active_tangent,
         const char (*tangent_names)[MAX_NAME], int tangent_names_count,
         bool *rcalc_act, bool *rcalc_ren, int *ract_uv_n, int *rren_uv_n,
-        char *ract_uv_name, char *rren_uv_name, char *rtangent_mask) {
+        char *ract_uv_name, char *rren_uv_name, short *rtangent_mask) {
 	/* Active uv in viewport */
 	int layer_index = CustomData_get_layer_index(loopData, CD_MLOOPUV);
 	*ract_uv_n = CustomData_get_active_layer(loopData, CD_MLOOPUV);
@@ -526,8 +524,11 @@ void BKE_mesh_calc_loop_tangent_step_0(
 			add = true;
 		}
 		if (add)
-			*rtangent_mask |= (char)(1 << n);
+			*rtangent_mask |= (short)(1 << n);
 	}
+
+	if (uv_layer_num == 0)
+		*rtangent_mask |= DM_TANGENT_MASK_ORCO;
 }
 
 /**
@@ -549,18 +550,16 @@ void BKE_mesh_calc_loop_tangent_ex(
         /* result */
         CustomData *loopdata_out,
         const uint  loopdata_out_len,
-        char *tangent_mask_curr_p)
+        short *tangent_mask_curr_p)
 {
-	BLI_assert(CustomData_number_of_layers(loopdata, CD_MLOOPUV) != 0);
-
 	int act_uv_n = -1;
 	int ren_uv_n = -1;
 	bool calc_act = false;
 	bool calc_ren = false;
 	char act_uv_name[MAX_NAME];
 	char ren_uv_name[MAX_NAME];
-	char tangent_mask = 0;
-	char tangent_mask_curr = *tangent_mask_curr_p;
+	short tangent_mask = 0;
+	short tangent_mask_curr = *tangent_mask_curr_p;
 
 	BKE_mesh_calc_loop_tangent_step_0(
 	        loopdata, calc_active_tangent, tangent_names, tangent_names_len,
@@ -571,6 +570,8 @@ void BKE_mesh_calc_loop_tangent_ex(
 		for (int i = 0; i < tangent_names_len; i++)
 			if (tangent_names[i][0])
 				BKE_mesh_add_loop_tangent_named_layer_for_uv(loopdata, loopdata_out, (int)loopdata_out_len, tangent_names[i]);
+		if ((tangent_mask & DM_TANGENT_MASK_ORCO) && CustomData_get_named_layer_index(loopdata, CD_TANGENT, "") == -1)
+			    CustomData_add_layer_named(loopdata_out, CD_TANGENT, CD_CALLOC, NULL, (int)loopdata_out_len, "");
 		if (calc_act && act_uv_name[0])
 			BKE_mesh_add_loop_tangent_named_layer_for_uv(loopdata, loopdata_out, (int)loopdata_out_len, act_uv_name);
 		if (calc_ren && ren_uv_name[0])
@@ -602,7 +603,7 @@ void BKE_mesh_calc_loop_tangent_ex(
 #endif
 
 		/* Calculation */
-		{
+		if (looptri_len != 0) {
 			TaskScheduler *scheduler = BLI_task_scheduler_get();
 			TaskPool *task_pool;
 			task_pool = BLI_task_pool_create(scheduler, NULL);
@@ -631,21 +632,25 @@ void BKE_mesh_calc_loop_tangent_ex(
 				mesh2tangent->precomputedFaceNormals = poly_normals;
 
 				mesh2tangent->orco = NULL;
-				mesh2tangent->mloopuv = CustomData_get_layer_named(loopdata, CD_MLOOPUV, loopdata->layers[index].name);
+				mesh2tangent->mloopuv = CustomData_get_layer_named(loopdata, CD_MLOOPUV, loopdata_out->layers[index].name);
+
+				/* Fill the resulting tangent_mask */
 				if (!mesh2tangent->mloopuv) {
-					mesh2tangent->orco = vert_orco;
-					if (!mesh2tangent->orco)
-						continue;
+				    mesh2tangent->orco = vert_orco;
+				    if (!mesh2tangent->orco)
+					    continue;
+
+				    tangent_mask_curr |= DM_TANGENT_MASK_ORCO;
+				}
+				else {
+				    int uv_ind = CustomData_get_named_layer_index(loopdata, CD_MLOOPUV, loopdata_out->layers[index].name);
+				    int uv_start = CustomData_get_layer_index(loopdata, CD_MLOOPUV);
+				    BLI_assert(uv_ind != -1 && uv_start != -1);
+				    BLI_assert(uv_ind - uv_start < MAX_MTFACE);
+				    tangent_mask_curr |= (short)(1 << (uv_ind - uv_start));
 				}
-				mesh2tangent->tangent = loopdata_out->layers[index].data;
 
-				/* Fill the resulting tangent_mask */
-				int uv_ind = CustomData_get_named_layer_index(
-				        loopdata, CD_MLOOPUV, loopdata_out->layers[index].name);
-				int uv_start = CustomData_get_layer_index(loopdata, CD_MLOOPUV);
-				BLI_assert(uv_ind != -1 && uv_start != -1);
-				BLI_assert(uv_ind - uv_start < MAX_MTFACE);
-				tangent_mask_curr |= (char)(1 << (uv_ind - uv_start));
+				mesh2tangent->tangent = loopdata_out->layers[index].data;
 				BLI_task_pool_push(task_pool, DM_calc_loop_tangents_thread, mesh2tangent, false, TASK_PRIORITY_LOW);
 			}
 
@@ -653,6 +658,9 @@ void BKE_mesh_calc_loop_tangent_ex(
 			BLI_task_pool_work_and_wait(task_pool);
 			BLI_task_pool_free(task_pool);
 		}
+		else {
+			tangent_mask_curr = tangent_mask;
+		}
 #ifdef USE_LOOPTRI_DETECT_QUADS
 		if (face_as_quad_map) {
 			MEM_freeN(face_as_quad_map);
@@ -663,21 +671,19 @@ void BKE_mesh_calc_loop_tangent_ex(
 
 		*tangent_mask_curr_p = tangent_mask_curr;
 
-		int uv_index, tan_index;
-
 		/* Update active layer index */
-		uv_index = CustomData_get_layer_index_n(loopdata, CD_MLOOPUV, act_uv_n);
-		if (uv_index != -1) {
-			tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, loopdata->layers[uv_index].name);
-			CustomData_set_layer_active_index(loopdata_out, CD_TANGENT, tan_index);
-		}
+		int act_uv_index = CustomData_get_layer_index_n(loopdata, CD_MLOOPUV, act_uv_n);
+		if (act_uv_index != -1) {
+		    int tan_index = CustomData_get_named_layer_index(loopdata, CD_TANGENT, loopdata->layers[act_uv_index].name);
+		    CustomData_set_layer_active_index(loopdata, CD_TANGENT, tan_index);
+		}/* else tangent has been built from orco */
 
 		/* Update render layer index */
-		uv_index = CustomData_get_layer_index_n(loopdata, CD_MLOOPUV, ren_uv_n);
-		if (uv_index != -1) {
-			tan_index = CustomData_get_named_layer_index(loopdata_out, CD_TANGENT, loopdata->layers[uv_index].name);
-			CustomData_set_layer_render_index(loopdata_out, CD_TANGENT, tan_index);
-		}
+		int ren_uv_index = CustomData_get_layer_index_n(loopdata, CD_MLOOPUV, ren_uv_n);
+		if (ren_uv_index != -1) {
+		    int tan_index = CustomData_get_named_layer_index(loopdata, CD_TANGENT, loopdata->layers[ren_uv_index].name);
+		    CustomData_set_layer_render_index(loopdata, CD_TANGENT, tan_index);
+		}/* else tangent has been built from orco */
 	}
 }
 
diff --git a/source/blender/blenkernel/intern/modifier.c b/source/blender/blenkernel/intern/modifier.c
index 2276d56b9c6..1a146dc67d1 100644
--- a/source/blender/blenkernel/intern/modifier.c
+++ b/source/blender/blenkernel/intern/modifier.c
@@ -59,6 +59,8 @@
 
 #include "BKE_appdir.h"
 #include "BKE_key.h"
+#include "BKE_library.h"
+#include "BKE_library_query.h"
 #include "BKE_multires.h"
 #include "BKE_DerivedMesh.h"
 
@@ -269,14 +271,37 @@ void modifier_copyData_generic(const ModifierData *md_src, ModifierData *md_dst)
 	memcpy(md_dst_data, md_src_data, (size_t)mti->structSize - data_size);
 }
 
-void modifier_copyData(ModifierData *md, ModifierData *target)
+static void modifier_copy_data_id_us_cb(void *UNUSED(userData), Object *UNUSED(ob), ID **idpoin, int cb_flag)
+{
+	ID *id = *idpoin;
+	if (id != NULL && (cb_flag & IDWALK_CB_USER) != 0) {
+		id_us_plus(id);
+	}
+}
+
+void modifier_copyData_ex(ModifierData *md, ModifierData *target, const int flag)
 {
 	const ModifierTypeInfo *mti = modifierType_getInfo(md->type);
 
 	target->mode = md->mode;
 
-	if (mti->copyData)
+	if (mti->copyData) {
 		mti->copyData(md, target);
+	}
+
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		if (mti->foreachIDLink) {
+			mti->foreachIDLink(target, NULL, modifier_copy_data_id_us_cb, NULL);
+		}
+		else if (mti->foreachObjectLink) {
+			mti->foreachObjectLink(target, NULL, (ObjectWalkFunc)modifier_copy_data_id_us_cb, NULL);
+		}
+	}
+}
+
+void modifier_copyData(ModifierData *md, ModifierData *target)
+{
+	modifier_copyData_ex(md, target, 0);
 }
 
 
@@ -732,8 +757,8 @@ void modifier_path_init(char *path, int path_maxlen, const char *name)
 /* wrapper around ModifierTypeInfo.applyModifier that ensures valid normals */
 
 struct DerivedMesh *modwrap_applyModifier(
-        ModifierData *md, Object *ob,
-        struct DerivedMesh *dm,
+        ModifierData *md, const struct EvaluationContext *eval_ctx,
+        Object *ob, struct DerivedMesh *dm,
         ModifierApplyFlag flag)
 {
 	const ModifierTypeInfo *mti = modifierType_getInfo(md->type);
@@ -742,12 +767,12 @@ struct DerivedMesh *modwrap_applyModifier(
 	if (mti->dependsOnNormals && mti->dependsOnNormals(md)) {
 		DM_ensure_normals(dm);
 	}
-	return mti->applyModifier(md, ob, dm, flag);
+	return mti->applyModifier(md, eval_ctx, ob, dm, flag);
 }
 
 struct DerivedMesh *modwrap_applyModifierEM(
-        ModifierData *md, Object *ob,
-        struct BMEditMesh *em,
+        ModifierData *md, const struct EvaluationContext *eval_ctx,
+        Object *ob, struct BMEditMesh *em,
         DerivedMesh *dm,
         ModifierApplyFlag flag)
 {
@@ -757,12 +782,12 @@ struct DerivedMesh *modwrap_applyModifierEM(
 	if (mti->dependsOnNormals && mti->dependsOnNormals(md)) {
 		DM_ensure_normals(dm);
 	}
-	return mti->applyModifierEM(md, ob, em, dm, flag);
+	return mti->applyModifierEM(md, eval_ctx, ob, em, dm, flag);
 }
 
 void modwrap_deformVerts(
-        ModifierData *md, Object *ob,
-        DerivedMesh *dm,
+        ModifierData *md, const struct EvaluationContext *eval_ctx,
+        Object *ob, DerivedMesh *dm,
         float (*vertexCos)[3], int numVerts,
         ModifierApplyFlag flag)
 {
@@ -772,11 +797,11 @@ void modwrap_deformVerts(
 	if (dm && mti->dependsOnNormals && mti->dependsOnNormals(md)) {
 		DM_ensure_normals(dm);
 	}
-	mti->deformVerts(md, ob, dm, vertexCos, numVerts, flag);
+	mti->deformVerts(md, eval_ctx, ob, dm, vertexCos, numVerts, flag);
 }
 
 void modwrap_deformVertsEM(
-        ModifierData *md, Object *ob,
+        ModifierData *md, const struct EvaluationContext *eval_ctx, Object *ob,
         struct BMEditMesh *em, DerivedMesh *dm,
         float (*vertexCos)[3], int numVerts)
 {
@@ -786,6 +811,6 @@ void modwrap_deformVertsEM(
 	if (dm && mti->dependsOnNormals && mti->dependsOnNormals(md)) {
 		DM_ensure_normals(dm);
 	}
-	mti->deformVertsEM(md, ob, em, dm, vertexCos, numVerts);
+	mti->deformVertsEM(md, eval_ctx, ob, em, dm, vertexCos, numVerts);
 }
 /* end modifier callback wrappers */
diff --git a/source/blender/blenkernel/intern/movieclip.c b/source/blender/blenkernel/intern/movieclip.c
index dfa8742a295..16d597e25fa 100644
--- a/source/blender/blenkernel/intern/movieclip.c
+++ b/source/blender/blenkernel/intern/movieclip.c
@@ -588,7 +588,7 @@ static MovieClip *movieclip_alloc(Main *bmain, const char *name)
 {
 	MovieClip *clip;
 
-	clip = BKE_libblock_alloc(bmain, ID_MC, name);
+	clip = BKE_libblock_alloc(bmain, ID_MC, name, 0);
 
 	clip->aspx = clip->aspy = 1.0f;
 
@@ -1488,25 +1488,33 @@ void BKE_movieclip_free(MovieClip *clip)
 	BKE_animdata_free((ID *) clip, false);
 }
 
-MovieClip *BKE_movieclip_copy(Main *bmain, const MovieClip *clip)
+/**
+ * Only copy internal data of MovieClip ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_movieclip_copy_data(Main *UNUSED(bmain), MovieClip *clip_dst, const MovieClip *clip_src, const int flag)
 {
-	MovieClip *clip_new;
-
-	clip_new = BKE_libblock_copy(bmain, &clip->id);
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
 
-	clip_new->anim = NULL;
-	clip_new->cache = NULL;
+	clip_dst->anim = NULL;
+	clip_dst->cache = NULL;
 
-	BKE_tracking_copy(&clip_new->tracking, &clip->tracking);
-	clip_new->tracking_context = NULL;
+	BKE_tracking_copy(&clip_dst->tracking, &clip_src->tracking, flag_subdata);
+	clip_dst->tracking_context = NULL;
 
-	id_us_plus((ID *)clip_new->gpd);
-
-	BKE_color_managed_colorspace_settings_copy(&clip_new->colorspace_settings, &clip->colorspace_settings);
-
-	BKE_id_copy_ensure_local(bmain, &clip->id, &clip_new->id);
+	BKE_color_managed_colorspace_settings_copy(&clip_dst->colorspace_settings, &clip_src->colorspace_settings);
+}
 
-	return clip_new;
+MovieClip *BKE_movieclip_copy(Main *bmain, const MovieClip *clip)
+{
+	MovieClip *clip_copy;
+	BKE_id_copy_ex(bmain, &clip->id, (ID **)&clip_copy, 0, false);
+	return clip_copy;
 }
 
 void BKE_movieclip_make_local(Main *bmain, MovieClip *clip, const bool lib_local)
diff --git a/source/blender/blenkernel/intern/multires.c b/source/blender/blenkernel/intern/multires.c
index 9679b585e6f..7ef4b588dcd 100644
--- a/source/blender/blenkernel/intern/multires.c
+++ b/source/blender/blenkernel/intern/multires.c
@@ -276,14 +276,14 @@ static MDisps *multires_mdisps_initialize_hidden(Mesh *me, int level)
 	return mdisps;
 }
 
-DerivedMesh *get_multires_dm(Scene *scene, MultiresModifierData *mmd, Object *ob)
+DerivedMesh *get_multires_dm(const struct EvaluationContext *eval_ctx, Scene *scene, MultiresModifierData *mmd, Object *ob)
 {
 	ModifierData *md = (ModifierData *)mmd;
 	const ModifierTypeInfo *mti = modifierType_getInfo(md->type);
-	DerivedMesh *tdm = mesh_get_derived_deform(scene, ob, CD_MASK_BAREMESH);
+	DerivedMesh *tdm = mesh_get_derived_deform(eval_ctx, scene, ob, CD_MASK_BAREMESH);
 	DerivedMesh *dm;
 
-	dm = mti->applyModifier(md, ob, tdm, MOD_APPLY_USECACHE | MOD_APPLY_IGNORE_SIMPLIFY);
+	dm = mti->applyModifier(md, eval_ctx, ob, tdm, MOD_APPLY_USECACHE | MOD_APPLY_IGNORE_SIMPLIFY);
 	if (dm == tdm) {
 		dm = CDDM_copy(tdm);
 	}
@@ -397,10 +397,10 @@ void multires_force_render_update(Object *ob)
 		multires_force_update(ob);
 }
 
-int multiresModifier_reshapeFromDM(Scene *scene, MultiresModifierData *mmd,
+int multiresModifier_reshapeFromDM(const struct EvaluationContext *eval_ctx, Scene *scene, MultiresModifierData *mmd,
                                    Object *ob, DerivedMesh *srcdm)
 {
-	DerivedMesh *mrdm = get_multires_dm(scene, mmd, ob);
+	DerivedMesh *mrdm = get_multires_dm(eval_ctx, scene, mmd, ob);
 
 	if (mrdm && srcdm && mrdm->getNumVerts(mrdm) == srcdm->getNumVerts(srcdm)) {
 		multires_mvert_to_ss(mrdm, srcdm->getVertArray(srcdm));
@@ -419,13 +419,13 @@ int multiresModifier_reshapeFromDM(Scene *scene, MultiresModifierData *mmd,
 }
 
 /* Returns 1 on success, 0 if the src's totvert doesn't match */
-int multiresModifier_reshape(Scene *scene, MultiresModifierData *mmd, Object *dst, Object *src)
+int multiresModifier_reshape(const struct EvaluationContext *eval_ctx, Scene *scene, MultiresModifierData *mmd, Object *dst, Object *src)
 {
-	DerivedMesh *srcdm = mesh_get_derived_final(scene, src, CD_MASK_BAREMESH);
-	return multiresModifier_reshapeFromDM(scene, mmd, dst, srcdm);
+	DerivedMesh *srcdm = mesh_get_derived_final(eval_ctx, scene, src, CD_MASK_BAREMESH);
+	return multiresModifier_reshapeFromDM(eval_ctx, scene, mmd, dst, srcdm);
 }
 
-int multiresModifier_reshapeFromDeformMod(Scene *scene, MultiresModifierData *mmd,
+int multiresModifier_reshapeFromDeformMod(const struct EvaluationContext *eval_ctx, Scene *scene, MultiresModifierData *mmd,
                                           Object *ob, ModifierData *md)
 {
 	const ModifierTypeInfo *mti = modifierType_getInfo(md->type);
@@ -437,12 +437,12 @@ int multiresModifier_reshapeFromDeformMod(Scene *scene, MultiresModifierData *mm
 		return 0;
 
 	/* Create DerivedMesh for deformation modifier */
-	dm = get_multires_dm(scene, mmd, ob);
+	dm = get_multires_dm(eval_ctx, scene, mmd, ob);
 	numVerts = dm->getNumVerts(dm);
 	deformedVerts = MEM_mallocN(sizeof(float[3]) * numVerts, "multiresReshape_deformVerts");
 
 	dm->getVertCos(dm, deformedVerts);
-	mti->deformVerts(md, ob, dm, deformedVerts, numVerts, 0);
+	mti->deformVerts(md, eval_ctx, ob, dm, deformedVerts, numVerts, 0);
 
 	ndm = CDDM_copy(dm);
 	CDDM_apply_vert_coords(ndm, deformedVerts);
@@ -451,7 +451,7 @@ int multiresModifier_reshapeFromDeformMod(Scene *scene, MultiresModifierData *mm
 	dm->release(dm);
 
 	/* Reshaping */
-	result = multiresModifier_reshapeFromDM(scene, mmd, ob, ndm);
+	result = multiresModifier_reshapeFromDM(eval_ctx, scene, mmd, ob, ndm);
 
 	/* Cleanup */
 	ndm->release(ndm);
@@ -2174,7 +2174,7 @@ static void multires_sync_levels(Scene *scene, Object *ob_src, Object *ob_dst)
 	}
 }
 
-static void multires_apply_smat(Scene *scene, Object *ob, float smat[3][3])
+static void multires_apply_smat(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float smat[3][3])
 {
 	DerivedMesh *dm = NULL, *cddm = NULL, *subdm = NULL;
 	CCGElem **gridData, **subGridData;
@@ -2199,10 +2199,10 @@ static void multires_apply_smat(Scene *scene, Object *ob, float smat[3][3])
 	high_mmd.lvl = high_mmd.totlvl;
 
 	/* unscaled multires with applied displacement */
-	subdm = get_multires_dm(scene, &high_mmd, ob);
+	subdm = get_multires_dm(eval_ctx, scene, &high_mmd, ob);
 
 	/* prepare scaled CDDM to create ccgDN */
-	cddm = mesh_get_derived_deform(scene, ob, CD_MASK_BAREMESH);
+	cddm = mesh_get_derived_deform(eval_ctx, scene, ob, CD_MASK_BAREMESH);
 
 	totvert = cddm->getNumVerts(cddm);
 	vertCos = MEM_mallocN(sizeof(*vertCos) * totvert, "multiresScale vertCos");
@@ -2276,17 +2276,17 @@ int multires_mdisp_corners(MDisps *s)
 	return 0;
 }
 
-void multiresModifier_scale_disp(Scene *scene, Object *ob)
+void multiresModifier_scale_disp(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
 	float smat[3][3];
 
 	/* object's scale matrix */
 	BKE_object_scale_to_mat3(ob, smat);
 
-	multires_apply_smat(scene, ob, smat);
+	multires_apply_smat(eval_ctx, scene, ob, smat);
 }
 
-void multiresModifier_prepare_join(Scene *scene, Object *ob, Object *to_ob)
+void multiresModifier_prepare_join(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, Object *to_ob)
 {
 	float smat[3][3], tmat[3][3], mat[3][3];
 	multires_sync_levels(scene, to_ob, ob);
@@ -2297,7 +2297,7 @@ void multiresModifier_prepare_join(Scene *scene, Object *ob, Object *to_ob)
 	BKE_object_scale_to_mat3(ob, smat);
 	mul_m3_m3m3(mat, smat, tmat);
 
-	multires_apply_smat(scene, ob, mat);
+	multires_apply_smat(eval_ctx, scene, ob, mat);
 }
 
 /* update multires data after topology changing */
diff --git a/source/blender/blenkernel/intern/nla.c b/source/blender/blenkernel/intern/nla.c
index 148fc3827e0..478b854c4df 100644
--- a/source/blender/blenkernel/intern/nla.c
+++ b/source/blender/blenkernel/intern/nla.c
@@ -59,7 +59,7 @@
 #include "BKE_library.h"
 
 #ifdef WITH_AUDASPACE
-#  include AUD_SPECIAL_H
+#  include <AUD_Special.h>
 #endif
 
 #include "RNA_access.h"
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 8ccd652edd4..3ff4885f7fc 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -902,80 +902,100 @@ bNode *nodeAddStaticNode(const struct bContext *C, bNodeTree *ntree, int type)
 	return nodeAddNode(C, ntree, idname);
 }
 
-static void node_socket_copy(bNodeSocket *dst, bNodeSocket *src)
+static void node_socket_copy(bNodeSocket *sock_dst, bNodeSocket *sock_src, const int flag)
 {
-	src->new_sock = dst;
-	
-	if (src->prop)
-		dst->prop = IDP_CopyProperty(src->prop);
-	
-	if (src->default_value)
-		dst->default_value = MEM_dupallocN(src->default_value);
-	
-	dst->stack_index = 0;
+	sock_src->new_sock = sock_dst;
+
+	if (sock_src->prop) {
+		sock_dst->prop = IDP_CopyProperty_ex(sock_src->prop, flag);
+	}
+
+	if (sock_src->default_value) {
+		sock_dst->default_value = MEM_dupallocN(sock_src->default_value);
+	}
+
+	sock_dst->stack_index = 0;
 	/* XXX some compositor node (e.g. image, render layers) still store
 	 * some persistent buffer data here, need to clear this to avoid dangling pointers.
 	 */
-	dst->cache = NULL;
+	sock_dst->cache = NULL;
 }
 
 /* keep socket listorder identical, for copying links */
 /* ntree is the target tree */
-bNode *nodeCopyNode(bNodeTree *ntree, bNode *node)
+bNode *BKE_node_copy_ex(bNodeTree *ntree, bNode *node_src, const int flag)
 {
-	bNode *nnode = MEM_callocN(sizeof(bNode), "dupli node");
-	bNodeSocket *sock, *oldsock;
-	bNodeLink *link, *oldlink;
+	bNode *node_dst = MEM_callocN(sizeof(bNode), "dupli node");
+	bNodeSocket *sock_dst, *sock_src;
+	bNodeLink *link_dst, *link_src;
 
-	*nnode = *node;
+	*node_dst = *node_src;
 	/* can be called for nodes outside a node tree (e.g. clipboard) */
 	if (ntree) {
-		nodeUniqueName(ntree, nnode);
+		nodeUniqueName(ntree, node_dst);
 
-		BLI_addtail(&ntree->nodes, nnode);
+		BLI_addtail(&ntree->nodes, node_dst);
 	}
 
-	BLI_duplicatelist(&nnode->inputs, &node->inputs);
-	oldsock = node->inputs.first;
-	for (sock = nnode->inputs.first; sock; sock = sock->next, oldsock = oldsock->next)
-		node_socket_copy(sock, oldsock);
-	
-	BLI_duplicatelist(&nnode->outputs, &node->outputs);
-	oldsock = node->outputs.first;
-	for (sock = nnode->outputs.first; sock; sock = sock->next, oldsock = oldsock->next)
-		node_socket_copy(sock, oldsock);
-	
-	if (node->prop)
-		nnode->prop = IDP_CopyProperty(node->prop);
-	
-	BLI_duplicatelist(&nnode->internal_links, &node->internal_links);
-	oldlink = node->internal_links.first;
-	for (link = nnode->internal_links.first; link; link = link->next, oldlink = oldlink->next) {
-		link->fromnode = nnode;
-		link->tonode = nnode;
-		link->fromsock = link->fromsock->new_sock;
-		link->tosock = link->tosock->new_sock;
+	BLI_duplicatelist(&node_dst->inputs, &node_src->inputs);
+	for (sock_dst = node_dst->inputs.first, sock_src = node_src->inputs.first;
+	     sock_dst != NULL;
+	     sock_dst = sock_dst->next, sock_src = sock_src->next)
+	{
+		node_socket_copy(sock_dst, sock_src, flag);
 	}
-	
-	/* don't increase node->id users, freenode doesn't decrement either */
-	
-	if (node->typeinfo->copyfunc)
-		node->typeinfo->copyfunc(ntree, nnode, node);
-	
-	node->new_node = nnode;
-	nnode->new_node = NULL;
-	
-	if (nnode->typeinfo->copyfunc_api) {
+
+	BLI_duplicatelist(&node_dst->outputs, &node_src->outputs);
+	for (sock_dst = node_dst->outputs.first, sock_src = node_src->outputs.first;
+	     sock_dst != NULL;
+	     sock_dst = sock_dst->next, sock_src = sock_src->next)
+	{
+		node_socket_copy(sock_dst, sock_src, flag);
+	}
+
+	if (node_src->prop) {
+		node_dst->prop = IDP_CopyProperty_ex(node_src->prop, flag);
+	}
+
+	BLI_duplicatelist(&node_dst->internal_links, &node_src->internal_links);
+	for (link_dst = node_dst->internal_links.first, link_src = node_src->internal_links.first;
+	     link_dst != NULL;
+	     link_dst = link_dst->next, link_src = link_src->next)
+	{
+		link_dst->fromnode = node_dst;
+		link_dst->tonode = node_dst;
+		link_dst->fromsock = link_dst->fromsock->new_sock;
+		link_dst->tosock = link_dst->tosock->new_sock;
+	}
+
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		id_us_plus(node_dst->id);
+	}
+
+	if (node_src->typeinfo->copyfunc) {
+		node_src->typeinfo->copyfunc(ntree, node_dst, node_src);
+	}
+
+	node_src->new_node = node_dst;
+	node_dst->new_node = NULL;
+
+	if (node_dst->typeinfo->copyfunc_api) {
 		PointerRNA ptr;
-		RNA_pointer_create((ID *)ntree, &RNA_Node, nnode, &ptr);
-		
-		nnode->typeinfo->copyfunc_api(&ptr, node);
+		RNA_pointer_create((ID *)ntree, &RNA_Node, node_dst, &ptr);
+
+		node_dst->typeinfo->copyfunc_api(&ptr, node_src);
 	}
-	
-	if (ntree)
+
+	if (ntree) {
 		ntree->update |= NTREE_UPDATE_NODES;
-	
-	return nnode;
+	}
+
+	return node_dst;
+}
+
+bNode *nodeCopyNode(bNodeTree *ntree, bNode *node)
+{
+	return BKE_node_copy_ex(ntree, node, LIB_ID_CREATE_NO_USER_REFCOUNT);
 }
 
 /* also used via rna api, so we check for proper input output direction */
@@ -1172,7 +1192,7 @@ bNodeTree *ntreeAddTree(Main *bmain, const char *name, const char *idname)
 	 * node groups and other tree types are created as library data.
 	 */
 	if (bmain) {
-		ntree = BKE_libblock_alloc(bmain, ID_NT, name);
+		ntree = BKE_libblock_alloc(bmain, ID_NT, name, 0);
 	}
 	else {
 		ntree = MEM_callocN(sizeof(bNodeTree), "new node tree");
@@ -1191,119 +1211,96 @@ bNodeTree *ntreeAddTree(Main *bmain, const char *name, const char *idname)
 	return ntree;
 }
 
-/* Warning: this function gets called during some rather unexpected times
- *	- this gets called when executing compositing updates (for threaded previews)
- *	- when the nodetree datablock needs to be copied (i.e. when users get copied)
- *	- for scene duplication use ntreeSwapID() after so we don't have stale pointers.
+/**
+ * Only copy internal data of NodeTree ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
  *
- * do_make_extern: keep enabled for general use, only reason _not_ to enable is when
- * copying for internal use (threads for eg), where you wont want it to modify the
- * scene data.
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
  */
-static bNodeTree *ntreeCopyTree_internal(
-        const bNodeTree *ntree, Main *bmain,
-        bool skip_database, bool do_id_user, bool do_make_extern, bool copy_previews)
+void BKE_node_tree_copy_data(Main *UNUSED(bmain), bNodeTree *ntree_dst, const bNodeTree *ntree_src, const int flag)
 {
-	bNodeTree *newtree;
-	bNode *node /*, *nnode */ /* UNUSED */, *last;
-	bNodeSocket *sock, *oldsock;
-	bNodeLink *link;
-	
-	if (ntree == NULL) return NULL;
-	
-	/* is ntree part of library? */
-	if (bmain && !skip_database && BLI_findindex(&bmain->nodetree, ntree) >= 0) {
-		newtree = BKE_libblock_copy(bmain, &ntree->id);
-	}
-	else {
-		newtree = BKE_libblock_copy_nolib(&ntree->id, true);
-	}
+	bNodeSocket *sock_dst, *sock_src;
+	bNodeLink *link_dst;
 
-	id_us_plus((ID *)newtree->gpd);
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
 
 	/* in case a running nodetree is copied */
-	newtree->execdata = NULL;
+	ntree_dst->execdata = NULL;
 
-	newtree->duplilock = NULL;
-	
-	BLI_listbase_clear(&newtree->nodes);
-	BLI_listbase_clear(&newtree->links);
-	
-	last = ntree->nodes.last;
-	for (node = ntree->nodes.first; node; node = node->next) {
-
-		/* ntreeUserDecrefID inline */
-		if (do_id_user) {
-			id_us_plus(node->id);
-		}
+	ntree_dst->duplilock = NULL;
 
-		if (do_make_extern) {
-			id_lib_extern(node->id);
-		}
+	BLI_listbase_clear(&ntree_dst->nodes);
+	BLI_listbase_clear(&ntree_dst->links);
 
-		node->new_node = NULL;
-		/* nnode = */ nodeCopyNode(newtree, node);   /* sets node->new */
-		
-		/* make sure we don't copy new nodes again! */
-		if (node == last)
-			break;
+	for (bNode *node_src = ntree_src->nodes.first; node_src; node_src = node_src->next) {
+		BKE_node_copy_ex(ntree_dst, node_src, flag_subdata);
 	}
-	
+
 	/* copy links */
-	BLI_duplicatelist(&newtree->links, &ntree->links);
-	for (link = newtree->links.first; link; link = link->next) {
-		link->fromnode = (link->fromnode ? link->fromnode->new_node : NULL);
-		link->fromsock = (link->fromsock ? link->fromsock->new_sock : NULL);
-		link->tonode = (link->tonode ? link->tonode->new_node : NULL);
-		link->tosock = (link->tosock ? link->tosock->new_sock : NULL);
+	BLI_duplicatelist(&ntree_dst->links, &ntree_src->links);
+	for (link_dst = ntree_dst->links.first; link_dst; link_dst = link_dst->next) {
+		link_dst->fromnode = (link_dst->fromnode ? link_dst->fromnode->new_node : NULL);
+		link_dst->fromsock = (link_dst->fromsock ? link_dst->fromsock->new_sock : NULL);
+		link_dst->tonode = (link_dst->tonode ? link_dst->tonode->new_node : NULL);
+		link_dst->tosock = (link_dst->tosock ? link_dst->tosock->new_sock : NULL);
 		/* update the link socket's pointer */
-		if (link->tosock)
-			link->tosock->link = link;
+		if (link_dst->tosock) {
+			link_dst->tosock->link = link_dst;
+		}
 	}
-	
+
 	/* copy interface sockets */
-	BLI_duplicatelist(&newtree->inputs, &ntree->inputs);
-	oldsock = ntree->inputs.first;
-	for (sock = newtree->inputs.first; sock; sock = sock->next, oldsock = oldsock->next)
-		node_socket_copy(sock, oldsock);
-	
-	BLI_duplicatelist(&newtree->outputs, &ntree->outputs);
-	oldsock = ntree->outputs.first;
-	for (sock = newtree->outputs.first; sock; sock = sock->next, oldsock = oldsock->next)
-		node_socket_copy(sock, oldsock);
-	
+	BLI_duplicatelist(&ntree_dst->inputs, &ntree_src->inputs);
+	for (sock_dst = ntree_dst->inputs.first, sock_src = ntree_src->inputs.first;
+	     sock_dst != NULL;
+	     sock_dst = sock_dst->next, sock_src = sock_src->next)
+	{
+		node_socket_copy(sock_dst, sock_src, flag_subdata);
+	}
+
+	BLI_duplicatelist(&ntree_dst->outputs, &ntree_src->outputs);
+	for (sock_dst = ntree_dst->outputs.first, sock_src = ntree_src->outputs.first;
+	     sock_dst != NULL;
+	     sock_dst = sock_dst->next, sock_src = sock_src->next)
+	{
+		node_socket_copy(sock_dst, sock_src, flag_subdata);
+	}
+
 	/* copy preview hash */
-	if (ntree->previews && copy_previews) {
+	if (ntree_src->previews && (flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
 		bNodeInstanceHashIterator iter;
-		
-		newtree->previews = BKE_node_instance_hash_new("node previews");
-		
-		NODE_INSTANCE_HASH_ITER(iter, ntree->previews) {
+
+		ntree_dst->previews = BKE_node_instance_hash_new("node previews");
+
+		NODE_INSTANCE_HASH_ITER(iter, ntree_src->previews) {
 			bNodeInstanceKey key = BKE_node_instance_hash_iterator_get_key(&iter);
 			bNodePreview *preview = BKE_node_instance_hash_iterator_get_value(&iter);
-			BKE_node_instance_hash_insert(newtree->previews, key, BKE_node_preview_copy(preview));
+			BKE_node_instance_hash_insert(ntree_dst->previews, key, BKE_node_preview_copy(preview));
 		}
 	}
-	else
-		newtree->previews = NULL;
-	
+	else {
+		ntree_dst->previews = NULL;
+	}
+
 	/* update node->parent pointers */
-	for (node = newtree->nodes.first; node; node = node->next) {
-		if (node->parent)
-			node->parent = node->parent->new_node;
+	for (bNode *node_dst = ntree_dst->nodes.first, *node_src = ntree_src->nodes.first; node_dst; node_dst = node_dst->next, node_src = node_src->next) {
+		if (node_dst->parent) {
+			node_dst->parent = node_dst->parent->new_node;
+		}
 	}
-	
-	/* node tree will generate its own interface type */
-	newtree->interface_type = NULL;
-	
-	BKE_id_copy_ensure_local(bmain, &ntree->id, &newtree->id);
 
-	return newtree;
+	/* node tree will generate its own interface type */
+	ntree_dst->interface_type = NULL;
 }
 
 bNodeTree *ntreeCopyTree_ex(const bNodeTree *ntree, Main *bmain, const bool do_id_user)
 {
-	return ntreeCopyTree_internal(ntree, bmain, false, do_id_user, true, true);
+	bNodeTree *ntree_copy;
+	BKE_id_copy_ex(bmain, (ID *)ntree, (ID **)&ntree_copy, do_id_user ? 0 : LIB_ID_CREATE_NO_USER_REFCOUNT, false);
+	return ntree_copy;
 }
 bNodeTree *ntreeCopyTree(Main *bmain, const bNodeTree *ntree)
 {
@@ -1700,11 +1697,12 @@ static void node_free_node_ex(bNodeTree *ntree, bNode *node, bool remove_animdat
 			ntreeTexEndExecTree(ntree->execdata);
 			ntree->execdata = NULL;
 		}
-		
-		if (node->typeinfo->freefunc)
-			node->typeinfo->freefunc(node);
 	}
-	
+
+	if (node->typeinfo->freefunc) {
+		node->typeinfo->freefunc(node);
+	}
+
 	for (sock = node->inputs.first; sock; sock = nextsock) {
 		nextsock = sock->next;
 		node_socket_free(ntree, sock, node);
@@ -1993,10 +1991,11 @@ bNodeTree *ntreeLocalize(bNodeTree *ntree)
 			adt->tmpact = NULL;
 		}
 
-		/* Make full copy.
+		/* Make full copy outside of Main database.
 		 * Note: previews are not copied here.
 		 */
-		ltree = ntreeCopyTree_internal(ntree, G.main, true, false, false, false);
+		BKE_id_copy_ex(G.main, (ID *)ntree, (ID **)&ltree,
+		               LIB_ID_CREATE_NO_MAIN | LIB_ID_CREATE_NO_USER_REFCOUNT | LIB_ID_COPY_NO_PREVIEW, false);
 		ltree->flag |= NTREE_IS_LOCALIZED;
 
 		for (node = ltree->nodes.first; node; node = node->next) {
@@ -2024,7 +2023,7 @@ bNodeTree *ntreeLocalize(bNodeTree *ntree)
 
 		for (node = ntree->nodes.first; node; node = node->next) {
 			/* store new_node pointer to original */
-			node->new_node->new_node = node;
+			node->new_node->original = node;
 		}
 
 		if (ntree->typeinfo->localize)
@@ -2236,7 +2235,7 @@ static void ntree_interface_type_create(bNodeTree *ntree)
 	/* register a subtype of PropertyGroup */
 	srna = RNA_def_struct_ptr(&BLENDER_RNA, identifier, &RNA_PropertyGroup);
 	RNA_def_struct_ui_text(srna, name, description);
-	RNA_def_struct_duplicate_pointers(srna);
+	RNA_def_struct_duplicate_pointers(&BLENDER_RNA, srna);
 	
 	/* associate the RNA type with the node tree */
 	ntree->interface_type = srna;
@@ -2275,10 +2274,10 @@ StructRNA *ntreeInterfaceTypeGet(bNodeTree *ntree, int create)
 			ntree_interface_identifier(ntree, base, identifier, sizeof(identifier), name, description);
 			
 			/* rename the RNA type */
-			RNA_def_struct_free_pointers(srna);
-			RNA_def_struct_identifier(srna, identifier);
+			RNA_def_struct_free_pointers(&BLENDER_RNA, srna);
+			RNA_def_struct_identifier(&BLENDER_RNA, srna, identifier);
 			RNA_def_struct_ui_text(srna, name, description);
-			RNA_def_struct_duplicate_pointers(srna);
+			RNA_def_struct_duplicate_pointers(&BLENDER_RNA, srna);
 		}
 	}
 	else if (create) {
@@ -3174,12 +3173,20 @@ void nodeSynchronizeID(bNode *node, bool copy_to_id)
 
 void nodeLabel(bNodeTree *ntree, bNode *node, char *label, int maxlen)
 {
-	if (node->label[0] != '\0')
+	if (node->label[0] != '\0') {
 		BLI_strncpy(label, node->label, maxlen);
-	else if (node->typeinfo->labelfunc)
+	}
+	else if (node->typeinfo->labelfunc) {
 		node->typeinfo->labelfunc(ntree, node, label, maxlen);
-	else
-		BLI_strncpy(label, IFACE_(node->typeinfo->ui_name), maxlen);
+	}
+	else {
+		/* Kind of hacky and weak... Ideally would be better to use RNA here. :| */
+		const char *tmp = CTX_IFACE_(BLT_I18NCONTEXT_ID_NODETREE, node->typeinfo->ui_name);
+		if (tmp == node->typeinfo->ui_name) {
+			tmp = IFACE_(node->typeinfo->ui_name);
+		}
+		BLI_strncpy(label, tmp, maxlen);
+	}
 }
 
 static void node_type_base_defaults(bNodeType *ntype)
@@ -3587,12 +3594,10 @@ static void registerShaderNodes(void)
 	register_node_type_sh_add_shader();
 	register_node_type_sh_uvmap();
 	register_node_type_sh_uvalongstroke();
-	register_node_type_sh_eevee_metallic();
 	register_node_type_sh_eevee_specular();
 
 	register_node_type_sh_output_lamp();
 	register_node_type_sh_output_material();
-	register_node_type_sh_output_eevee_material();
 	register_node_type_sh_output_world();
 	register_node_type_sh_output_linestyle();
 
@@ -3799,3 +3804,46 @@ void BKE_nodetree_remove_layer_n(bNodeTree *ntree, Scene *scene, const int layer
 		}
 	}
 }
+
+static void node_copy_default_values_list(ListBase *sockets_dst,
+                                          const ListBase *sockets_src)
+{
+	bNodeSocket *sock_dst = sockets_dst->first;
+	const bNodeSocket *sock_src = sockets_src->first;
+	while (sock_dst != NULL) {
+		node_socket_copy_default_value(sock_dst, sock_src);
+		sock_dst = sock_dst->next;
+		sock_src = sock_src->next;
+	}
+}
+
+static void node_copy_default_values(bNode *node_dst, const bNode *node_src)
+{
+	node_copy_default_values_list(&node_dst->inputs, &node_src->inputs);
+	node_copy_default_values_list(&node_dst->outputs, &node_src->outputs);
+}
+
+void BKE_nodetree_copy_default_values(bNodeTree *ntree_dst,
+                                      const bNodeTree *ntree_src)
+{
+	if (ntree_dst == ntree_src) {
+		return;
+	}
+	bNode *node_dst = ntree_dst->nodes.first;
+	const bNode *node_src = ntree_src->nodes.first;
+	while (node_dst != NULL) {
+		node_copy_default_values(node_dst, node_src);
+		node_dst = node_dst->next;
+		node_src = node_src->next;
+	}
+}
+
+void BKE_nodetree_shading_params_eval(const struct EvaluationContext *UNUSED(eval_ctx),
+                                      bNodeTree *ntree_dst,
+                                      const bNodeTree *ntree_src)
+{
+	if (G.debug & G_DEBUG_DEPSGRAPH) {
+		printf("%s on %s (%p)\n", __func__, ntree_src->id.name, ntree_dst);
+	}
+	BKE_nodetree_copy_default_values(ntree_dst, ntree_src);
+}
diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 68e5ddf8583..a47e88a8e48 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -319,7 +319,7 @@ void BKE_object_link_modifiers(struct Object *ob_dst, const struct Object *ob_sr
 		modifier_unique_name(&ob_dst->modifiers, nmd);
 	}
 
-	BKE_object_copy_particlesystems(ob_dst, ob_src);
+	BKE_object_copy_particlesystems(ob_dst, ob_src, 0);
 
 	/* TODO: smoke?, cloth? */
 }
@@ -337,14 +337,14 @@ void BKE_object_free_derived_caches(Object *ob)
 		Mesh *me = ob->data;
 
 		if (me && me->bb) {
-			atomic_fetch_and_or_uint32((uint*)&me->bb->flag, BOUNDBOX_DIRTY);
+			atomic_fetch_and_or_uint32((uint *)&me->bb->flag, BOUNDBOX_DIRTY);
 		}
 	}
 	else if (ELEM(ob->type, OB_SURF, OB_CURVE, OB_FONT)) {
 		Curve *cu = ob->data;
 
 		if (cu && cu->bb) {
-			atomic_fetch_and_or_uint32((uint*)&cu->bb->flag, BOUNDBOX_DIRTY);
+			atomic_fetch_and_or_uint32((uint *)&cu->bb->flag, BOUNDBOX_DIRTY);
 		}
 	}
 
@@ -365,6 +365,8 @@ void BKE_object_free_derived_caches(Object *ob)
 	}
 
 	if (ob->mesh_evaluated != NULL) {
+		/* Restore initial pointer. */
+		ob->data = ob->mesh_evaluated->id.newid;
 		/* Evaluated mesh points to edit mesh, but does not own it. */
 		ob->mesh_evaluated->edit_btmesh = NULL;
 		BKE_mesh_free(ob->mesh_evaluated);
@@ -560,6 +562,15 @@ bool BKE_object_is_in_wpaint_select_vert(Object *ob)
 	return false;
 }
 
+/**
+ * Return if the object is visible, as evaluated by depsgraph
+ * Keep in sync with rna_object.c (object.is_visible).
+ */
+bool BKE_object_is_visible(Object *ob)
+{
+	return (ob->base_flag & BASE_VISIBLED) != 0;
+}
+
 bool BKE_object_exists_check(Object *obtest)
 {
 	Object *ob;
@@ -703,7 +714,7 @@ Object *BKE_object_add_only_object(Main *bmain, int type, const char *name)
 	if (!name)
 		name = get_obdata_defname(type);
 
-	ob = BKE_libblock_alloc(bmain, ID_OB, name);
+	ob = BKE_libblock_alloc(bmain, ID_OB, name, 0);
 
 	/* default object vars */
 	ob->type = type;
@@ -832,7 +843,7 @@ static LodLevel *lod_level_select(Object *ob, const float camera_position[3])
 
 bool BKE_object_lod_is_usable(Object *ob, SceneLayer *sl)
 {
-	bool active = (sl) ? ob == OBACT_NEW : false;
+	bool active = (sl) ? ob == OBACT_NEW(sl) : false;
 	return (ob->mode == OB_MODE_OBJECT || !active);
 }
 
@@ -873,7 +884,7 @@ struct Object *BKE_object_lod_matob_get(Object *ob, SceneLayer *sl)
 #endif  /* WITH_GAMEENGINE */
 
 
-SoftBody *copy_softbody(const SoftBody *sb, bool copy_caches)
+SoftBody *copy_softbody(const SoftBody *sb, const int flag)
 {
 	SoftBody *sbn;
 	
@@ -881,7 +892,7 @@ SoftBody *copy_softbody(const SoftBody *sb, bool copy_caches)
 	
 	sbn = MEM_dupallocN(sb);
 
-	if (copy_caches == false) {
+	if ((flag & LIB_ID_COPY_CACHES) == 0) {
 		sbn->totspring = sbn->totpoint = 0;
 		sbn->bpoint = NULL;
 		sbn->bspring = NULL;
@@ -910,7 +921,7 @@ SoftBody *copy_softbody(const SoftBody *sb, bool copy_caches)
 	
 	sbn->scratch = NULL;
 
-	sbn->pointcache = BKE_ptcache_copy_list(&sbn->ptcaches, &sb->ptcaches, copy_caches);
+	sbn->pointcache = BKE_ptcache_copy_list(&sbn->ptcaches, &sb->ptcaches, flag);
 
 	if (sb->effector_weights)
 		sbn->effector_weights = MEM_dupallocN(sb->effector_weights);
@@ -918,7 +929,7 @@ SoftBody *copy_softbody(const SoftBody *sb, bool copy_caches)
 	return sbn;
 }
 
-BulletSoftBody *copy_bulletsoftbody(const BulletSoftBody *bsb)
+BulletSoftBody *copy_bulletsoftbody(const BulletSoftBody *bsb, const int UNUSED(flag))
 {
 	BulletSoftBody *bsbn;
 
@@ -929,7 +940,7 @@ BulletSoftBody *copy_bulletsoftbody(const BulletSoftBody *bsb)
 	return bsbn;
 }
 
-ParticleSystem *BKE_object_copy_particlesystem(ParticleSystem *psys)
+ParticleSystem *BKE_object_copy_particlesystem(ParticleSystem *psys, const int flag)
 {
 	ParticleSystem *psysn;
 	ParticleData *pa;
@@ -966,7 +977,7 @@ ParticleSystem *BKE_object_copy_particlesystem(ParticleSystem *psys)
 
 	if (psys->clmd) {
 		psysn->clmd = (ClothModifierData *)modifier_new(eModifierType_Cloth);
-		modifier_copyData((ModifierData *)psys->clmd, (ModifierData *)psysn->clmd);
+		modifier_copyData_ex((ModifierData *)psys->clmd, (ModifierData *)psysn->clmd, flag);
 		psys->hair_in_dm = psys->hair_out_dm = NULL;
 	}
 
@@ -985,7 +996,8 @@ ParticleSystem *BKE_object_copy_particlesystem(ParticleSystem *psys)
 	BLI_listbase_clear(&psysn->childcachebufs);
 	psysn->renderdata = NULL;
 	
-	psysn->pointcache = BKE_ptcache_copy_list(&psysn->ptcaches, &psys->ptcaches, false);
+	/* XXX Never copy caches here? */
+	psysn->pointcache = BKE_ptcache_copy_list(&psysn->ptcaches, &psys->ptcaches, flag & ~LIB_ID_COPY_CACHES);
 
 	/* XXX - from reading existing code this seems correct but intended usage of
 	 * pointcache should /w cloth should be added in 'ParticleSystem' - campbell */
@@ -993,12 +1005,14 @@ ParticleSystem *BKE_object_copy_particlesystem(ParticleSystem *psys)
 		psysn->clmd->point_cache = psysn->pointcache;
 	}
 
-	id_us_plus((ID *)psysn->part);
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		id_us_plus((ID *)psysn->part);
+	}
 
 	return psysn;
 }
 
-void BKE_object_copy_particlesystems(Object *ob_dst, const Object *ob_src)
+void BKE_object_copy_particlesystems(Object *ob_dst, const Object *ob_src, const int flag)
 {
 	ParticleSystem *psys, *npsys;
 	ModifierData *md;
@@ -1010,7 +1024,7 @@ void BKE_object_copy_particlesystems(Object *ob_dst, const Object *ob_src)
 
 	BLI_listbase_clear(&ob_dst->particlesystem);
 	for (psys = ob_src->particlesystem.first; psys; psys = psys->next) {
-		npsys = BKE_object_copy_particlesystem(psys);
+		npsys = BKE_object_copy_particlesystem(psys, flag);
 
 		BLI_addtail(&ob_dst->particlesystem, npsys);
 
@@ -1047,23 +1061,25 @@ void BKE_object_copy_softbody(Object *ob_dst, const Object *ob_src)
 {
 	if (ob_src->soft) {
 		ob_dst->softflag = ob_src->softflag;
-		ob_dst->soft = copy_softbody(ob_src->soft, false);
+		ob_dst->soft = copy_softbody(ob_src->soft, 0);
 	}
 }
 
-static void copy_object_pose(Object *obn, const Object *ob)
+static void copy_object_pose(Object *obn, const Object *ob, const int flag)
 {
 	bPoseChannel *chan;
 	
 	/* note: need to clear obn->pose pointer first, so that BKE_pose_copy_data works (otherwise there's a crash) */
 	obn->pose = NULL;
-	BKE_pose_copy_data(&obn->pose, ob->pose, 1);    /* 1 = copy constraints */
+	BKE_pose_copy_data_ex(&obn->pose, ob->pose, flag, true);  /* true = copy constraints */
 
 	for (chan = obn->pose->chanbase.first; chan; chan = chan->next) {
 		bConstraint *con;
 		
 		chan->flag &= ~(POSE_LOC | POSE_ROT | POSE_SIZE);
 		
+		/* XXX Remapping object pointing onto itself should be handled by generic BKE_library_remap stuff, but...
+		 *     the flush_constraint_targets callback am not sure about, so will delay that for now. */
 		for (con = chan->constraints.first; con; con = con->next) {
 			const bConstraintTypeInfo *cti = BKE_constraint_typeinfo_get(con);
 			ListBase targets = {NULL, NULL};
@@ -1084,13 +1100,10 @@ static void copy_object_pose(Object *obn, const Object *ob)
 	}
 }
 
-static void copy_object_lod(Object *obn, const Object *ob)
+static void copy_object_lod(Object *obn, const Object *ob, const int UNUSED(flag))
 {
 	BLI_duplicatelist(&obn->lodlevels, &ob->lodlevels);
 
-	if (obn->lodlevels.first)
-		((LodLevel *)obn->lodlevels.first)->source = obn;
-
 	obn->currentlod = (LodLevel *)obn->lodlevels.first;
 }
 
@@ -1135,100 +1148,101 @@ void BKE_object_transform_copy(Object *ob_tar, const Object *ob_src)
 	copy_v3_v3(ob_tar->size, ob_src->size);
 }
 
-Object *BKE_object_copy_ex(Main *bmain, const Object *ob, bool copy_caches)
+/**
+ * Only copy internal data of Object ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_object_copy_data(Main *UNUSED(bmain), Object *ob_dst, const Object *ob_src, const int flag)
 {
-	Object *obn;
 	ModifierData *md;
-	int a;
 
-	obn = BKE_libblock_copy(bmain, &ob->id);
-	
-	if (ob->totcol) {
-		obn->mat = MEM_dupallocN(ob->mat);
-		obn->matbits = MEM_dupallocN(ob->matbits);
-		obn->totcol = ob->totcol;
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
+
+	if (ob_src->totcol) {
+		ob_dst->mat = MEM_dupallocN(ob_src->mat);
+		ob_dst->matbits = MEM_dupallocN(ob_src->matbits);
+		ob_dst->totcol = ob_src->totcol;
 	}
 
-	if (ob->iuser) obn->iuser = MEM_dupallocN(ob->iuser);
+	if (ob_src->iuser) ob_dst->iuser = MEM_dupallocN(ob_src->iuser);
 	
-	if (ob->bb) obn->bb = MEM_dupallocN(ob->bb);
-	obn->flag &= ~OB_FROMGROUP;
+	if (ob_src->bb) ob_dst->bb = MEM_dupallocN(ob_src->bb);
+	ob_dst->flag &= ~OB_FROMGROUP;
 	
-	BLI_listbase_clear(&obn->modifiers);
+	BLI_listbase_clear(&ob_dst->modifiers);
 	
-	for (md = ob->modifiers.first; md; md = md->next) {
+	for (md = ob_src->modifiers.first; md; md = md->next) {
 		ModifierData *nmd = modifier_new(md->type);
 		BLI_strncpy(nmd->name, md->name, sizeof(nmd->name));
-		modifier_copyData(md, nmd);
-		BLI_addtail(&obn->modifiers, nmd);
+		modifier_copyData_ex(md, nmd, flag_subdata);
+		BLI_addtail(&ob_dst->modifiers, nmd);
 	}
 
-	BLI_listbase_clear(&obn->prop);
-	BKE_bproperty_copy_list(&obn->prop, &ob->prop);
+	BLI_listbase_clear(&ob_dst->prop);
+	BKE_bproperty_copy_list(&ob_dst->prop, &ob_src->prop);
 
-	BKE_sca_logic_copy(obn, ob);
+	BKE_sca_logic_copy(ob_dst, ob_src, flag_subdata);
 
-	if (ob->pose) {
-		copy_object_pose(obn, ob);
+	if (ob_src->pose) {
+		copy_object_pose(ob_dst, ob_src, flag_subdata);
 		/* backwards compat... non-armatures can get poses in older files? */
-		if (ob->type == OB_ARMATURE)
-			BKE_pose_rebuild(obn, obn->data);
+		if (ob_src->type == OB_ARMATURE)
+			BKE_pose_rebuild(ob_dst, ob_dst->data);
 	}
-	defgroup_copy_list(&obn->defbase, &ob->defbase);
-	BKE_object_facemap_copy_list(&obn->fmaps, &ob->fmaps);
-	BKE_constraints_copy(&obn->constraints, &ob->constraints, true);
+	defgroup_copy_list(&ob_dst->defbase, &ob_src->defbase);
+	BKE_object_facemap_copy_list(&ob_dst->fmaps, &ob_src->fmaps);
+	BKE_constraints_copy_ex(&ob_dst->constraints, &ob_src->constraints, flag_subdata, true);
 
-	obn->mode = OB_MODE_OBJECT;
-	obn->sculpt = NULL;
+	ob_dst->mode = OB_MODE_OBJECT;
+	ob_dst->sculpt = NULL;
 
-	/* increase user numbers */
-	id_us_plus((ID *)obn->data);
-	id_us_plus((ID *)obn->poselib);
-	id_us_plus((ID *)obn->gpd);
-	id_us_plus((ID *)obn->dup_group);
+	if (ob_src->pd) {
+		ob_dst->pd = MEM_dupallocN(ob_src->pd);
+		if (ob_dst->pd->rng) {
+			ob_dst->pd->rng = MEM_dupallocN(ob_src->pd->rng);
+		}
+	}
+	ob_dst->soft = copy_softbody(ob_src->soft, flag_subdata);
+	ob_dst->bsoft = copy_bulletsoftbody(ob_src->bsoft, flag_subdata);
+	ob_dst->rigidbody_object = BKE_rigidbody_copy_object(ob_src, flag_subdata);
+	ob_dst->rigidbody_constraint = BKE_rigidbody_copy_constraint(ob_src, flag_subdata);
 
-	for (a = 0; a < obn->totcol; a++) id_us_plus((ID *)obn->mat[a]);
+	BKE_object_copy_particlesystems(ob_dst, ob_src, flag_subdata);
 	
-	if (ob->pd) {
-		obn->pd = MEM_dupallocN(ob->pd);
-		if (obn->pd->tex)
-			id_us_plus(&(obn->pd->tex->id));
-		if (obn->pd->rng)
-			obn->pd->rng = MEM_dupallocN(ob->pd->rng);
-	}
-	obn->soft = copy_softbody(ob->soft, copy_caches);
-	obn->bsoft = copy_bulletsoftbody(ob->bsoft);
-	obn->rigidbody_object = BKE_rigidbody_copy_object(ob);
-	obn->rigidbody_constraint = BKE_rigidbody_copy_constraint(ob);
-
-	BKE_object_copy_particlesystems(obn, ob);
-	
-	obn->derivedDeform = NULL;
-	obn->derivedFinal = NULL;
+	ob_dst->derivedDeform = NULL;
+	ob_dst->derivedFinal = NULL;
 
-	BLI_listbase_clear(&obn->gpulamp);
-	BLI_listbase_clear(&obn->pc_ids);
-	BLI_listbase_clear(&obn->drawdata);
+	BLI_listbase_clear(&ob_dst->gpulamp);
+	BLI_listbase_clear(&ob_dst->drawdata);
+	BLI_listbase_clear(&ob_dst->pc_ids);
 
-	obn->mpath = NULL;
+	ob_dst->mpath = NULL;
 
-	copy_object_lod(obn, ob);
+	copy_object_lod(ob_dst, ob_src, flag_subdata);
 	
-	/* Copy runtime surve data. */
-	obn->curve_cache = NULL;
-
-	BKE_id_copy_ensure_local(bmain, &ob->id, &obn->id);
+	/* Do not copy runtime curve data. */
+	ob_dst->curve_cache = NULL;
 
 	/* Do not copy object's preview (mostly due to the fact renderers create temp copy of objects). */
-	obn->preview = NULL;
-
-	return obn;
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0 && false) {  /* XXX TODO temp hack */
+		BKE_previewimg_id_copy(&ob_dst->id, &ob_src->id);
+	}
+	else {
+		ob_dst->preview = NULL;
+	}
 }
 
 /* copy objects, will re-initialize cached simulation data */
 Object *BKE_object_copy(Main *bmain, const Object *ob)
 {
-	return BKE_object_copy_ex(bmain, ob, false);
+	Object *ob_copy;
+	BKE_id_copy_ex(bmain, &ob->id, (ID **)&ob_copy, 0, false);
+	return ob_copy;
 }
 
 void BKE_object_make_local_ex(Main *bmain, Object *ob, const bool lib_local, const bool clear_proxy)
@@ -1304,10 +1318,10 @@ static void armature_set_id_extern(Object *ob)
 	unsigned int lay = arm->layer_protected;
 	
 	for (pchan = ob->pose->chanbase.first; pchan; pchan = pchan->next) {
-		if (!(pchan->bone->layer & lay)) {
+		if (!(pchan->bone->layer & lay))
 			id_lib_extern((ID *)pchan->custom);
-		}
 	}
+			
 }
 
 void BKE_object_copy_proxy_drivers(Object *ob, Object *target)
@@ -1426,7 +1440,7 @@ void BKE_object_make_proxy(Object *ob, Object *target, Object *gob)
 	
 	/* type conversions */
 	if (target->type == OB_ARMATURE) {
-		copy_object_pose(ob, target);   /* data copy, object pointers in constraints */
+		copy_object_pose(ob, target, 0);   /* data copy, object pointers in constraints */
 		BKE_pose_rest(ob->pose);            /* clear all transforms in channels */
 		BKE_pose_rebuild(ob, ob->data); /* set all internal links */
 		
@@ -1709,13 +1723,16 @@ static bool ob_parcurve(Scene *scene, Object *ob, Object *par, float mat[4][4])
 	Curve *cu = par->data;
 	float vec[4], dir[3], quat[4], radius, ctime;
 
+	/* TODO: Make sure this doesn't crash. */
+#if 0
 	/* only happens on reload file, but violates depsgraph still... fix! */
 	if (par->curve_cache == NULL) {
 		if (scene == NULL) {
 			return false;
 		}
-		BKE_displist_make_curveTypes(scene, par, 0);
+		BKE_displist_make_curveTypes(eval_ctx, scene, par, 0);
 	}
+#endif
 
 	if (par->curve_cache->path == NULL) {
 		return false;
@@ -2096,8 +2113,9 @@ static bool where_is_object_parslow(Object *ob, float obmat[4][4], float slowmat
 }
 
 /* note, scene is the active scene while actual_scene is the scene the object resides in */
-void BKE_object_where_is_calc_time_ex(Scene *scene, Object *ob, float ctime,
-                                      RigidBodyWorld *rbw, float r_originmat[3][3])
+void BKE_object_where_is_calc_time_ex(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, float ctime,
+        RigidBodyWorld *rbw, float r_originmat[3][3])
 {
 	if (ob == NULL) return;
 	
@@ -2132,7 +2150,7 @@ void BKE_object_where_is_calc_time_ex(Scene *scene, Object *ob, float ctime,
 	if (ob->constraints.first && !(ob->transflag & OB_NO_CONSTRAINTS)) {
 		bConstraintOb *cob;
 		cob = BKE_constraints_make_evalob(scene, ob, NULL, CONSTRAINT_OBTYPE_OBJECT);
-		BKE_constraints_solve(&ob->constraints, cob, ctime);
+		BKE_constraints_solve(eval_ctx, &ob->constraints, cob, ctime);
 		BKE_constraints_clear_evalob(cob);
 	}
 	
@@ -2141,9 +2159,9 @@ void BKE_object_where_is_calc_time_ex(Scene *scene, Object *ob, float ctime,
 	else ob->transflag &= ~OB_NEG_SCALE;
 }
 
-void BKE_object_where_is_calc_time(Scene *scene, Object *ob, float ctime)
+void BKE_object_where_is_calc_time(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, float ctime)
 {
-	BKE_object_where_is_calc_time_ex(scene, ob, ctime, NULL, NULL);
+	BKE_object_where_is_calc_time_ex(eval_ctx, scene, ob, ctime, NULL, NULL);
 }
 
 /* get object transformation matrix without recalculating dependencies and
@@ -2168,17 +2186,17 @@ void BKE_object_where_is_calc_mat4(Scene *scene, Object *ob, float obmat[4][4])
 	}
 }
 
-void BKE_object_where_is_calc_ex(Scene *scene, RigidBodyWorld *rbw, Object *ob, float r_originmat[3][3])
+void BKE_object_where_is_calc_ex(const EvaluationContext *eval_ctx, Scene *scene, RigidBodyWorld *rbw, Object *ob, float r_originmat[3][3])
 {
-	BKE_object_where_is_calc_time_ex(scene, ob, BKE_scene_frame_get(scene), rbw, r_originmat);
+	BKE_object_where_is_calc_time_ex(eval_ctx, scene, ob, BKE_scene_frame_get(scene), rbw, r_originmat);
 }
-void BKE_object_where_is_calc(Scene *scene, Object *ob)
+void BKE_object_where_is_calc(const EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
-	BKE_object_where_is_calc_time_ex(scene, ob, BKE_scene_frame_get(scene), NULL, NULL);
+	BKE_object_where_is_calc_time_ex(eval_ctx, scene, ob, BKE_scene_frame_get(scene), NULL, NULL);
 }
 
 /* for calculation of the inverse parent transform, only used for editor */
-void BKE_object_workob_calc_parent(Scene *scene, Object *ob, Object *workob)
+void BKE_object_workob_calc_parent(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, Object *workob)
 {
 	BKE_object_workob_clear(workob);
 	
@@ -2200,7 +2218,7 @@ void BKE_object_workob_calc_parent(Scene *scene, Object *ob, Object *workob)
 
 	BLI_strncpy(workob->parsubstr, ob->parsubstr, sizeof(workob->parsubstr));
 
-	BKE_object_where_is_calc(scene, workob);
+	BKE_object_where_is_calc(eval_ctx, scene, workob);
 }
 
 /* see BKE_pchan_apply_mat4() for the equivalent 'pchan' function */
@@ -2531,7 +2549,7 @@ void BKE_scene_foreach_display_point(
 	Base *base;
 	Object *ob;
 
-	for (base = FIRSTBASE_NEW; base; base = base->next) {
+	for (base = FIRSTBASE_NEW(sl); base; base = base->next) {
 		if (((base->flag & BASE_VISIBLED) != 0) && ((base->flag & BASE_SELECTED) != 0)) {
 			ob = base->object;
 
@@ -2630,7 +2648,7 @@ bool BKE_object_parent_loop_check(const Object *par, const Object *ob)
 /* the main object update call, for object matrix, constraints, keys and displist (modifiers) */
 /* requires flags to be set! */
 /* Ideally we shouldn't have to pass the rigid body world, but need bigger restructuring to avoid id */
-void BKE_object_handle_update_ex(EvaluationContext *eval_ctx,
+void BKE_object_handle_update_ex(const EvaluationContext *eval_ctx,
                                  Scene *scene, Object *ob,
                                  RigidBodyWorld *rbw,
                                  const bool do_proxy_update)
@@ -2679,7 +2697,7 @@ void BKE_object_handle_update_ex(EvaluationContext *eval_ctx,
 					copy_m4_m4(ob->obmat, ob->proxy_from->obmat);
 			}
 			else
-				BKE_object_where_is_calc_ex(scene, rbw, ob, NULL);
+				BKE_object_where_is_calc_ex(eval_ctx, scene, rbw, ob, NULL);
 		}
 		
 		if (ob->recalc & OB_RECALC_DATA) {
@@ -2709,7 +2727,7 @@ void BKE_object_handle_update_ex(EvaluationContext *eval_ctx,
  * e.g. "scene" <-- set 1 <-- set 2 ("ob" lives here) <-- set 3 <-- ... <-- set n
  * rigid bodies depend on their world so use BKE_object_handle_update_ex() to also pass along the corrent rigid body world
  */
-void BKE_object_handle_update(EvaluationContext *eval_ctx, Scene *scene, Object *ob)
+void BKE_object_handle_update(const EvaluationContext *eval_ctx, Scene *scene, Object *ob)
 {
 	BKE_object_handle_update_ex(eval_ctx, scene, ob, NULL, true);
 }
@@ -2718,7 +2736,7 @@ void BKE_object_sculpt_modifiers_changed(Object *ob)
 {
 	SculptSession *ss = ob->sculpt;
 
-	if (ss) {
+	if (ss && ss->building_vp_handle == false) {
 		if (!ss->cache) {
 			/* we free pbvh on changes, except during sculpt since it can't deal with
 			 * changing PVBH node organization, we hope topology does not change in
@@ -2729,6 +2747,9 @@ void BKE_object_sculpt_modifiers_changed(Object *ob)
 			}
 
 			BKE_sculptsession_free_deformMats(ob->sculpt);
+
+			/* In vertex/weight paint, force maps to be rebuilt. */
+			BKE_sculptsession_free_vwpaint_data(ob->sculpt);
 		}
 		else {
 			PBVHNode **nodes;
@@ -3625,9 +3646,9 @@ static void object_cacheIgnoreClear(Object *ob, int state)
 /* Note: this function should eventually be replaced by depsgraph functionality.
  * Avoid calling this in new code unless there is a very good reason for it!
  */
-bool BKE_object_modifier_update_subframe(Scene *scene, Object *ob, bool update_mesh,
-                                         int parent_recursion, float frame,
-                                         int type)
+bool BKE_object_modifier_update_subframe(
+        const EvaluationContext *eval_ctx, Scene *scene, Object *ob, bool update_mesh,
+        int parent_recursion, float frame, int type)
 {
 	ModifierData *md = modifiers_findByType(ob, (ModifierType)type);
 	bConstraint *con;
@@ -3650,8 +3671,8 @@ bool BKE_object_modifier_update_subframe(Scene *scene, Object *ob, bool update_m
 	if (parent_recursion) {
 		int recursion = parent_recursion - 1;
 		bool no_update = false;
-		if (ob->parent) no_update |= BKE_object_modifier_update_subframe(scene, ob->parent, 0, recursion, frame, type);
-		if (ob->track) no_update |= BKE_object_modifier_update_subframe(scene, ob->track, 0, recursion, frame, type);
+		if (ob->parent) no_update |= BKE_object_modifier_update_subframe(eval_ctx, scene, ob->parent, 0, recursion, frame, type);
+		if (ob->track) no_update |= BKE_object_modifier_update_subframe(eval_ctx, scene, ob->track, 0, recursion, frame, type);
 
 		/* skip subframe if object is parented
 		 *  to vertex of a dynamic paint canvas */
@@ -3668,7 +3689,7 @@ bool BKE_object_modifier_update_subframe(Scene *scene, Object *ob, bool update_m
 				cti->get_constraint_targets(con, &targets);
 				for (ct = targets.first; ct; ct = ct->next) {
 					if (ct->tar)
-						BKE_object_modifier_update_subframe(scene, ct->tar, 0, recursion, frame, type);
+						BKE_object_modifier_update_subframe(eval_ctx, scene, ct->tar, 0, recursion, frame, type);
 				}
 				/* free temp targets */
 				if (cti->flush_constraint_targets)
@@ -3688,7 +3709,7 @@ bool BKE_object_modifier_update_subframe(Scene *scene, Object *ob, bool update_m
 		object_cacheIgnoreClear(ob, 0);
 	}
 	else
-		BKE_object_where_is_calc_time(scene, ob, frame);
+		BKE_object_where_is_calc_time(eval_ctx, scene, ob, frame);
 
 	/* for curve following objects, parented curve has to be updated too */
 	if (ob->type == OB_CURVE) {
@@ -3699,7 +3720,7 @@ bool BKE_object_modifier_update_subframe(Scene *scene, Object *ob, bool update_m
 	if (ob->type == OB_ARMATURE) {
 		bArmature *arm = ob->data;
 		BKE_animsys_evaluate_animdata(scene, &arm->id, arm->adt, frame, ADT_RECALC_ANIM);
-		BKE_pose_where_is(scene, ob);
+		BKE_pose_where_is(eval_ctx, scene, ob);
 	}
 
 	return false;
diff --git a/source/blender/blenkernel/intern/object_deform.c b/source/blender/blenkernel/intern/object_deform.c
index 455c4b6352d..754434eaef6 100644
--- a/source/blender/blenkernel/intern/object_deform.c
+++ b/source/blender/blenkernel/intern/object_deform.c
@@ -407,7 +407,7 @@ void BKE_object_defgroup_remove(Object *ob, bDeformGroup *defgroup)
 	else
 		object_defgroup_remove_object_mode(ob, defgroup);
 
-	BKE_mesh_batch_cache_dirty(ob->data, BKE_MESH_BATCH_DIRTY_PAINT);
+	BKE_mesh_batch_cache_dirty(ob->data, BKE_MESH_BATCH_DIRTY_ALL);
 }
 
 /**
@@ -484,6 +484,8 @@ bool BKE_object_defgroup_array_get(ID *id, MDeformVert **dvert_arr, int *dvert_t
 				*dvert_tot = lt->pntsu * lt->pntsv * lt->pntsw;
 				return true;
 			}
+			default:
+				break;
 		}
 	}
 
diff --git a/source/blender/blenkernel/intern/object_dupli.c b/source/blender/blenkernel/intern/object_dupli.c
index 774ddca061d..c25207d81bf 100644
--- a/source/blender/blenkernel/intern/object_dupli.c
+++ b/source/blender/blenkernel/intern/object_dupli.c
@@ -69,7 +69,7 @@
 /* Dupli-Geometry */
 
 typedef struct DupliContext {
-	EvaluationContext *eval_ctx;
+	const EvaluationContext *eval_ctx;
 	bool do_update;
 	bool animated;
 	Group *group; /* XXX child objects are selected from this group if set, could be nicer */
@@ -95,7 +95,7 @@ typedef struct DupliGenerator {
 static const DupliGenerator *get_dupli_generator(const DupliContext *ctx);
 
 /* create initial context for root object */
-static void init_context(DupliContext *r_ctx, EvaluationContext *eval_ctx, Scene *scene, Object *ob, float space_mat[4][4], bool update)
+static void init_context(DupliContext *r_ctx, const EvaluationContext *eval_ctx, Scene *scene, Object *ob, float space_mat[4][4], bool update)
 {
 	r_ctx->eval_ctx = eval_ctx;
 	r_ctx->scene = scene;
@@ -341,7 +341,7 @@ static void make_duplis_group(const DupliContext *ctx)
 	}
 }
 
-const DupliGenerator gen_dupli_group = {
+static const DupliGenerator gen_dupli_group = {
     OB_DUPLIGROUP,                  /* type */
     make_duplis_group               /* make_duplis */
 };
@@ -397,7 +397,7 @@ static void make_duplis_frames(const DupliContext *ctx)
 			 * However, this has always been the way that this worked (i.e. pre 2.5), so I guess that it'll be fine!
 			 */
 			BKE_animsys_evaluate_animdata(scene, &ob->id, ob->adt, (float)scene->r.cfra, ADT_RECALC_ANIM); /* ob-eval will do drivers, so we don't need to do them */
-			BKE_object_where_is_calc_time(scene, ob, (float)scene->r.cfra);
+			BKE_object_where_is_calc_time(ctx->eval_ctx, scene, ob, (float)scene->r.cfra);
 
 			make_dupli(ctx, ob, ob->obmat, scene->r.cfra, false, false);
 		}
@@ -411,7 +411,7 @@ static void make_duplis_frames(const DupliContext *ctx)
 	scene->r.cfra = cfrao;
 
 	BKE_animsys_evaluate_animdata(scene, &ob->id, ob->adt, (float)scene->r.cfra, ADT_RECALC_ANIM); /* ob-eval will do drivers, so we don't need to do them */
-	BKE_object_where_is_calc_time(scene, ob, (float)scene->r.cfra);
+	BKE_object_where_is_calc_time(ctx->eval_ctx, scene, ob, (float)scene->r.cfra);
 
 	/* but, to make sure unkeyed object transforms are still sane,
 	 * let's copy object's original data back over
@@ -419,7 +419,7 @@ static void make_duplis_frames(const DupliContext *ctx)
 	*ob = copyob;
 }
 
-const DupliGenerator gen_dupli_frames = {
+static const DupliGenerator gen_dupli_frames = {
     OB_DUPLIFRAMES,                 /* type */
     make_duplis_frames              /* make_duplis */
 };
@@ -545,10 +545,15 @@ static void make_duplis_verts(const DupliContext *ctx)
 		BMEditMesh *em = BKE_editmesh_from_object(parent);
 		CustomDataMask dm_mask = (use_texcoords ? CD_MASK_BAREMESH | CD_MASK_ORCO : CD_MASK_BAREMESH);
 
-		if (em)
-			vdd.dm = editbmesh_get_derived_cage(scene, parent, em, dm_mask);
-		else
-			vdd.dm = mesh_get_derived_final(scene, parent, dm_mask);
+		if (ctx->eval_ctx->mode == DAG_EVAL_RENDER) {
+			vdd.dm = mesh_create_derived_render(ctx->eval_ctx, scene, parent, dm_mask);
+		}
+		else if (em) {
+			vdd.dm = editbmesh_get_derived_cage(ctx->eval_ctx, scene, parent, em, dm_mask);
+		}
+		else {
+			vdd.dm = mesh_get_derived_final(ctx->eval_ctx, scene, parent, dm_mask);
+		}
 		vdd.edit_btmesh = me->edit_btmesh;
 
 		if (use_texcoords)
@@ -564,7 +569,7 @@ static void make_duplis_verts(const DupliContext *ctx)
 	vdd.dm->release(vdd.dm);
 }
 
-const DupliGenerator gen_dupli_verts = {
+static const DupliGenerator gen_dupli_verts = {
     OB_DUPLIVERTS,                  /* type */
     make_duplis_verts               /* make_duplis */
 };
@@ -677,7 +682,7 @@ static void make_duplis_font(const DupliContext *ctx)
 	MEM_freeN(chartransdata);
 }
 
-const DupliGenerator gen_dupli_verts_font = {
+static const DupliGenerator gen_dupli_verts_font = {
     OB_DUPLIVERTS,                  /* type */
     make_duplis_font                /* make_duplis */
 };
@@ -808,10 +813,15 @@ static void make_duplis_faces(const DupliContext *ctx)
 		BMEditMesh *em = BKE_editmesh_from_object(parent);
 		CustomDataMask dm_mask = (use_texcoords ? CD_MASK_BAREMESH | CD_MASK_ORCO | CD_MASK_MLOOPUV : CD_MASK_BAREMESH);
 
-		if (em)
-			fdd.dm = editbmesh_get_derived_cage(scene, parent, em, dm_mask);
-		else
-			fdd.dm = mesh_get_derived_final(scene, parent, dm_mask);
+		if (ctx->eval_ctx->mode == DAG_EVAL_RENDER) {
+			fdd.dm = mesh_create_derived_render(ctx->eval_ctx, scene, parent, dm_mask);
+		}
+		else if (em) {
+			fdd.dm = editbmesh_get_derived_cage(ctx->eval_ctx, scene, parent, em, dm_mask);
+		}
+		else {
+			fdd.dm = mesh_get_derived_final(ctx->eval_ctx, scene, parent, dm_mask);
+		}
 
 		if (use_texcoords) {
 			CustomData *ml_data = fdd.dm->getLoopDataLayout(fdd.dm);
@@ -835,7 +845,7 @@ static void make_duplis_faces(const DupliContext *ctx)
 	fdd.dm->release(fdd.dm);
 }
 
-const DupliGenerator gen_dupli_faces = {
+static const DupliGenerator gen_dupli_faces = {
     OB_DUPLIFACES,                  /* type */
     make_duplis_faces               /* make_duplis */
 };
@@ -888,6 +898,7 @@ static void make_duplis_particle_system(const DupliContext *ctx, ParticleSystem
 
 	if ((psys->renderdata || part->draw_as == PART_DRAW_REND) && ELEM(part->ren_as, PART_DRAW_OB, PART_DRAW_GR)) {
 		ParticleSimulationData sim = {NULL};
+		sim.eval_ctx = ctx->eval_ctx;
 		sim.scene = scene;
 		sim.ob = par;
 		sim.psys = psys;
@@ -1069,7 +1080,7 @@ static void make_duplis_particle_system(const DupliContext *ctx, ParticleSystem
 			}
 			else {
 				/* to give ipos in object correct offset */
-				BKE_object_where_is_calc_time(scene, ob, ctime - pa_time);
+				BKE_object_where_is_calc_time(ctx->eval_ctx, scene, ob, ctime - pa_time);
 
 				copy_v3_v3(vec, obmat[3]);
 				obmat[3][0] = obmat[3][1] = obmat[3][2] = 0.0f;
@@ -1156,7 +1167,7 @@ static void make_duplis_particles(const DupliContext *ctx)
 	}
 }
 
-const DupliGenerator gen_dupli_particles = {
+static const DupliGenerator gen_dupli_particles = {
     OB_DUPLIPARTS,                  /* type */
     make_duplis_particles           /* make_duplis */
 };
@@ -1205,7 +1216,7 @@ static const DupliGenerator *get_dupli_generator(const DupliContext *ctx)
 /* ---- ListBase dupli container implementation ---- */
 
 /* Returns a list of DupliObject */
-ListBase *object_duplilist_ex(EvaluationContext *eval_ctx, Scene *scene, Object *ob, bool update)
+ListBase *object_duplilist_ex(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, bool update)
 {
 	ListBase *duplilist = MEM_callocN(sizeof(ListBase), "duplilist");
 	DupliContext ctx;
@@ -1220,7 +1231,7 @@ ListBase *object_duplilist_ex(EvaluationContext *eval_ctx, Scene *scene, Object
 
 /* note: previously updating was always done, this is why it defaults to be on
  * but there are likely places it can be called without updating */
-ListBase *object_duplilist(EvaluationContext *eval_ctx, Scene *sce, Object *ob)
+ListBase *object_duplilist(const EvaluationContext *eval_ctx, Scene *sce, Object *ob)
 {
 	return object_duplilist_ex(eval_ctx, sce, ob, true);
 }
@@ -1261,7 +1272,7 @@ int count_duplilist(Object *ob)
 	return 1;
 }
 
-DupliApplyData *duplilist_apply(Object *ob, Scene *scene, ListBase *duplilist)
+DupliApplyData *duplilist_apply(const EvaluationContext *eval_ctx, Object *ob, Scene *scene, ListBase *duplilist)
 {
 	DupliApplyData *apply_data = NULL;
 	int num_objects = BLI_listbase_count(duplilist);
@@ -1277,7 +1288,7 @@ DupliApplyData *duplilist_apply(Object *ob, Scene *scene, ListBase *duplilist)
 		for (dob = duplilist->first, i = 0; dob; dob = dob->next, ++i) {
 			/* make sure derivedmesh is calculated once, before drawing */
 			if (scene && !(dob->ob->transflag & OB_DUPLICALCDERIVED) && dob->ob->type == OB_MESH) {
-				mesh_get_derived_final(scene, dob->ob, scene->customdata_mask);
+				mesh_get_derived_final(eval_ctx, scene, dob->ob, scene->customdata_mask);
 				dob->ob->transflag |= OB_DUPLICALCDERIVED;
 			}
 		}
diff --git a/source/blender/blenkernel/intern/object_update.c b/source/blender/blenkernel/intern/object_update.c
index 70e1f434388..c5d267ace9d 100644
--- a/source/blender/blenkernel/intern/object_update.c
+++ b/source/blender/blenkernel/intern/object_update.c
@@ -69,7 +69,7 @@
 
 static ThreadMutex material_lock = BLI_MUTEX_INITIALIZER;
 
-void BKE_object_eval_local_transform(EvaluationContext *UNUSED(eval_ctx),
+void BKE_object_eval_local_transform(const EvaluationContext *UNUSED(eval_ctx),
                                      Scene *UNUSED(scene),
                                      Object *ob)
 {
@@ -81,7 +81,7 @@ void BKE_object_eval_local_transform(EvaluationContext *UNUSED(eval_ctx),
 
 /* Evaluate parent */
 /* NOTE: based on solve_parenting(), but with the cruft stripped out */
-void BKE_object_eval_parent(EvaluationContext *UNUSED(eval_ctx),
+void BKE_object_eval_parent(const EvaluationContext *UNUSED(eval_ctx),
                             Scene *scene,
                             Object *ob)
 {
@@ -113,7 +113,7 @@ void BKE_object_eval_parent(EvaluationContext *UNUSED(eval_ctx),
 	}
 }
 
-void BKE_object_eval_constraints(EvaluationContext *UNUSED(eval_ctx),
+void BKE_object_eval_constraints(const EvaluationContext *eval_ctx,
                                  Scene *scene,
                                  Object *ob)
 {
@@ -132,11 +132,11 @@ void BKE_object_eval_constraints(EvaluationContext *UNUSED(eval_ctx),
 	 *
 	 */
 	cob = BKE_constraints_make_evalob(scene, ob, NULL, CONSTRAINT_OBTYPE_OBJECT);
-	BKE_constraints_solve(&ob->constraints, cob, ctime);
+	BKE_constraints_solve(eval_ctx, &ob->constraints, cob, ctime);
 	BKE_constraints_clear_evalob(cob);
 }
 
-void BKE_object_eval_done(EvaluationContext *UNUSED(eval_ctx), Object *ob)
+void BKE_object_eval_done(const EvaluationContext *UNUSED(eval_ctx), Object *ob)
 {
 	DEBUG_PRINT("%s on %s\n", __func__, ob->id.name);
 
@@ -145,9 +145,10 @@ void BKE_object_eval_done(EvaluationContext *UNUSED(eval_ctx), Object *ob)
 	else ob->transflag &= ~OB_NEG_SCALE;
 }
 
-void BKE_object_handle_data_update(EvaluationContext *eval_ctx,
-                                   Scene *scene,
-                                   Object *ob)
+void BKE_object_handle_data_update(
+        const EvaluationContext *eval_ctx,
+        Scene *scene,
+        Object *ob)
 {
 	ID *data_id = (ID *)ob->data;
 	AnimData *adt = BKE_animdata_from_id(data_id);
@@ -184,10 +185,10 @@ void BKE_object_handle_data_update(EvaluationContext *eval_ctx,
 			}
 #endif
 			if (em) {
-				makeDerivedMesh(scene, ob, em,  data_mask, false); /* was CD_MASK_BAREMESH */
+				makeDerivedMesh(eval_ctx, scene, ob, em,  data_mask, false); /* was CD_MASK_BAREMESH */
 			}
 			else {
-				makeDerivedMesh(scene, ob, NULL, data_mask, false);
+				makeDerivedMesh(eval_ctx, scene, ob, NULL, data_mask, false);
 			}
 			break;
 		}
@@ -199,7 +200,7 @@ void BKE_object_handle_data_update(EvaluationContext *eval_ctx,
 				}
 			}
 			else {
-				BKE_pose_where_is(scene, ob);
+				BKE_pose_where_is(eval_ctx, scene, ob);
 			}
 			break;
 
@@ -210,11 +211,11 @@ void BKE_object_handle_data_update(EvaluationContext *eval_ctx,
 		case OB_CURVE:
 		case OB_SURF:
 		case OB_FONT:
-			BKE_displist_make_curveTypes(scene, ob, 0);
+			BKE_displist_make_curveTypes(eval_ctx, scene, ob, 0);
 			break;
 
 		case OB_LATTICE:
-			BKE_lattice_modifiers_calc(scene, ob);
+			BKE_lattice_modifiers_calc(eval_ctx, scene, ob);
 			break;
 
 		case OB_EMPTY:
@@ -267,7 +268,7 @@ void BKE_object_handle_data_update(EvaluationContext *eval_ctx,
 					ob->transflag |= OB_DUPLIPARTS;
 				}
 
-				particle_system_update(scene, ob, psys, (eval_ctx->mode == DAG_EVAL_RENDER));
+				particle_system_update(eval_ctx, scene, ob, psys, (eval_ctx->mode == DAG_EVAL_RENDER));
 				psys = psys->next;
 			}
 			else if (psys->flag & PSYS_DELETE) {
@@ -285,7 +286,7 @@ void BKE_object_handle_data_update(EvaluationContext *eval_ctx,
 			 * the derivedmesh must be created before init_render_mesh,
 			 * since object_duplilist does dupliparticles before that */
 			CustomDataMask data_mask = CD_MASK_BAREMESH | CD_MASK_MFACE | CD_MASK_MTFACE | CD_MASK_MCOL;
-			dm = mesh_create_derived_render(scene, ob, data_mask);
+			dm = mesh_create_derived_render(eval_ctx, scene, ob, data_mask);
 			dm->release(dm);
 
 			for (psys = ob->particlesystem.first; psys; psys = psys->next)
@@ -296,7 +297,7 @@ void BKE_object_handle_data_update(EvaluationContext *eval_ctx,
 	/* quick cache removed */
 }
 
-void BKE_object_eval_uber_transform(EvaluationContext *UNUSED(eval_ctx),
+void BKE_object_eval_uber_transform(const EvaluationContext *UNUSED(eval_ctx),
                                     Scene *UNUSED(scene),
                                     Object *ob)
 {
@@ -326,7 +327,7 @@ void BKE_object_eval_uber_transform(EvaluationContext *UNUSED(eval_ctx),
 	}
 }
 
-void BKE_object_eval_uber_data(EvaluationContext *eval_ctx,
+void BKE_object_eval_uber_data(const EvaluationContext *eval_ctx,
                                Scene *scene,
                                Object *ob)
 {
@@ -361,7 +362,7 @@ void BKE_object_eval_uber_data(EvaluationContext *eval_ctx,
 			/* Copy materials so render engines can access them. */
 			new_mesh->mat = MEM_dupallocN(mesh->mat);
 			new_mesh->totcol = mesh->totcol;
-			DM_to_mesh(dm, new_mesh, ob, ob->lastDataMask, true);
+			DM_to_mesh(dm, new_mesh, ob, CD_MASK_MESH, true);
 			new_mesh->edit_btmesh = mesh->edit_btmesh;
 			/* Store result mesh as derived_mesh of object. This way we have
 			 * explicit  way to query final object evaluated data and know for sure
@@ -377,6 +378,11 @@ void BKE_object_eval_uber_data(EvaluationContext *eval_ctx,
 			/* NOTE: Watch out, some tools might need it!
 			 * So keep around for now..
 			 */
+			/* Store original ID as a pointer in evaluated ID.
+			 * This way we can restore original object data when we are freeing
+			 * evaluated mesh.
+			 */
+			new_mesh->id.newid = &mesh->id;
 		}
 #if 0
 		if (ob->derivedFinal != NULL) {
@@ -396,8 +402,16 @@ void BKE_object_eval_uber_data(EvaluationContext *eval_ctx,
 	ob->recalc &= ~(OB_RECALC_DATA | OB_RECALC_TIME);
 }
 
-void BKE_object_eval_cloth(EvaluationContext *UNUSED(eval_ctx), Scene *scene, Object *object)
+void BKE_object_eval_cloth(const EvaluationContext *UNUSED(eval_ctx), Scene *scene, Object *object)
 {
 	DEBUG_PRINT("%s on %s\n", __func__, object->id.name);
 	BKE_ptcache_object_reset(scene, object, PTCACHE_RESET_DEPSGRAPH);
 }
+
+void BKE_object_eval_update_shading(const EvaluationContext *UNUSED(eval_ctx), Object *object)
+{
+	DEBUG_PRINT("%s on %s\n", __func__, object->id.name);
+	if (object->type == OB_MESH) {
+		BKE_mesh_batch_cache_dirty(object->data, BKE_MESH_BATCH_DIRTY_SHADING);
+	}
+}
diff --git a/source/blender/blenkernel/intern/packedFile.c b/source/blender/blenkernel/intern/packedFile.c
index 64f90ef5c52..89f25136caf 100644
--- a/source/blender/blenkernel/intern/packedFile.c
+++ b/source/blender/blenkernel/intern/packedFile.c
@@ -522,6 +522,8 @@ static void unpack_generate_paths(
 		case ID_IM:
 			BLI_snprintf(r_relpath, relpathlen, "//textures/%s", tempname);
 			break;
+		default:
+			break;
 	}
 
 	{
@@ -712,6 +714,8 @@ bool BKE_pack_check(ID *id)
 			Library *li = (Library *)id;
 			return li->packedfile != NULL;
 		}
+		default:
+			break;
 	}
 	return false;
 }
@@ -750,5 +754,7 @@ void BKE_unpack_id(Main *bmain, ID *id, ReportList *reports, int how)
 			BKE_reportf(reports, RPT_ERROR, "Cannot unpack individual Library file, '%s'", li->name);
 			break;
 		}
+		default:
+			break;
 	}
 }
diff --git a/source/blender/blenkernel/intern/paint.c b/source/blender/blenkernel/intern/paint.c
index 00efa4aa732..7acddbbb90e 100644
--- a/source/blender/blenkernel/intern/paint.c
+++ b/source/blender/blenkernel/intern/paint.c
@@ -49,6 +49,7 @@
 
 #include "BKE_brush.h"
 #include "BKE_colortools.h"
+#include "BKE_deform.h"
 #include "BKE_main.h"
 #include "BKE_context.h"
 #include "BKE_crazyspace.h"
@@ -312,24 +313,31 @@ PaintCurve *BKE_paint_curve_add(Main *bmain, const char *name)
 {
 	PaintCurve *pc;
 
-	pc = BKE_libblock_alloc(bmain, ID_PC, name);
+	pc = BKE_libblock_alloc(bmain, ID_PC, name, 0);
 
 	return pc;
 }
 
-PaintCurve *BKE_paint_curve_copy(Main *bmain, const PaintCurve *pc)
+/**
+ * Only copy internal data of PaintCurve ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_paint_curve_copy_data(Main *UNUSED(bmain), PaintCurve *pc_dst, const PaintCurve *pc_src, const int UNUSED(flag))
 {
-	PaintCurve *pc_new;
-
-	pc_new = BKE_libblock_copy(bmain, &pc->id);
-
-	if (pc->tot_points != 0) {
-		pc_new->points = MEM_dupallocN(pc->points);
+	if (pc_src->tot_points != 0) {
+		pc_dst->points = MEM_dupallocN(pc_src->points);
 	}
+}
 
-	BKE_id_copy_ensure_local(bmain, &pc->id, &pc_new->id);
-
-	return pc_new;
+PaintCurve *BKE_paint_curve_copy(Main *bmain, const PaintCurve *pc)
+{
+	PaintCurve *pc_copy;
+	BKE_id_copy_ex(bmain, &pc->id, (ID **)&pc_copy, 0, false);
+	return pc_copy;
 }
 
 void BKE_paint_curve_make_local(Main *bmain, PaintCurve *pc, const bool lib_local)
@@ -391,7 +399,7 @@ Palette *BKE_palette_add(Main *bmain, const char *name)
 {
 	Palette *palette;
 
-	palette = BKE_libblock_alloc(bmain, ID_PAL, name);
+	palette = BKE_libblock_alloc(bmain, ID_PAL, name, 0);
 
 	/* enable fake user by default */
 	id_fake_user_set(&palette->id);
@@ -399,17 +407,24 @@ Palette *BKE_palette_add(Main *bmain, const char *name)
 	return palette;
 }
 
-Palette *BKE_palette_copy(Main *bmain, const Palette *palette)
+/**
+ * Only copy internal data of Palette ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_palette_copy_data(Main *UNUSED(bmain), Palette *palette_dst, const Palette *palette_src, const int UNUSED(flag))
 {
-	Palette *palette_new;
-
-	palette_new = BKE_libblock_copy(bmain, &palette->id);
-
-	BLI_duplicatelist(&palette_new->colors, &palette->colors);
-
-	BKE_id_copy_ensure_local(bmain, &palette->id, &palette_new->id);
+	BLI_duplicatelist(&palette_dst->colors, &palette_src->colors);
+}
 
-	return palette_new;
+Palette *BKE_palette_copy(Main *bmain, const Palette *palette)
+{
+	Palette *palette_copy;
+	BKE_id_copy_ex(bmain, &palette->id, (ID **)&palette_copy, 0, false);
+	return palette_copy;
 }
 
 void BKE_palette_make_local(Main *bmain, Palette *palette, const bool lib_local)
@@ -455,7 +470,7 @@ bool BKE_paint_select_vert_test(Object *ob)
 	         (ob->type == OB_MESH) &&
 	         (ob->data != NULL) &&
 	         (((Mesh *)ob->data)->editflag & ME_EDIT_PAINT_VERT_SEL) &&
-	         (ob->mode & OB_MODE_WEIGHT_PAINT)
+	         (ob->mode & OB_MODE_WEIGHT_PAINT || ob->mode & OB_MODE_VERTEX_PAINT)
 	         );
 }
 
@@ -540,12 +555,15 @@ void BKE_paint_free(Paint *paint)
  * still do a id_us_plus(), rather then if we were copying between 2 existing
  * scenes where a matching value should decrease the existing user count as
  * with paint_brush_set() */
-void BKE_paint_copy(Paint *src, Paint *tar)
+void BKE_paint_copy(Paint *src, Paint *tar, const int flag)
 {
 	tar->brush = src->brush;
-	id_us_plus((ID *)tar->brush);
-	id_us_plus((ID *)tar->palette);
 	tar->cavity_curve = curvemapping_copy(src->cavity_curve);
+
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		id_us_plus((ID *)tar->brush);
+		id_us_plus((ID *)tar->palette);
+	}
 }
 
 void BKE_paint_stroke_get_average(Scene *scene, Object *ob, float stroke[3])
@@ -659,6 +677,33 @@ void BKE_sculptsession_free_deformMats(SculptSession *ss)
 	MEM_SAFE_FREE(ss->deform_imats);
 }
 
+void BKE_sculptsession_free_vwpaint_data(struct SculptSession *ss)
+{
+	struct SculptVertexPaintGeomMap *gmap = NULL;
+	if (ss->mode_type == OB_MODE_VERTEX_PAINT) {
+		gmap = &ss->mode.vpaint.gmap;
+
+		MEM_SAFE_FREE(ss->mode.vpaint.previous_color);
+	}
+	else if (ss->mode_type == OB_MODE_WEIGHT_PAINT) {
+		gmap = &ss->mode.wpaint.gmap;
+
+		MEM_SAFE_FREE(ss->mode.wpaint.alpha_weight);
+		if (ss->mode.wpaint.dvert_prev) {
+			BKE_defvert_array_free_elems(ss->mode.wpaint.dvert_prev, ss->totvert);
+			MEM_freeN(ss->mode.wpaint.dvert_prev);
+			ss->mode.wpaint.dvert_prev = NULL;
+		}
+	}
+	else {
+		return;
+	}
+	MEM_SAFE_FREE(gmap->vert_to_loop);
+	MEM_SAFE_FREE(gmap->vert_map_mem);
+	MEM_SAFE_FREE(gmap->vert_to_poly);
+	MEM_SAFE_FREE(gmap->poly_map_mem);
+}
+
 /* Write out the sculpt dynamic-topology BMesh to the Mesh */
 static void sculptsession_bm_to_me_update_data_only(Object *ob, bool reorder)
 {
@@ -694,7 +739,7 @@ void BKE_sculptsession_bm_to_me_for_render(Object *object)
 		if (object->sculpt->bm) {
 			/* Ensure no points to old arrays are stored in DM
 			 *
-			 * Apparently, we could not use DAG_id_tag_update
+			 * Apparently, we could not use DEG_id_tag_update
 			 * here because this will lead to the while object
 			 * surface to disappear, so we'll release DM in place.
 			 */
@@ -750,6 +795,8 @@ void BKE_sculptsession_free(Object *ob)
 		if (ss->deform_imats)
 			MEM_freeN(ss->deform_imats);
 
+		BKE_sculptsession_free_vwpaint_data(ob->sculpt);
+
 		MEM_freeN(ss);
 
 		ob->sculpt = NULL;
@@ -823,8 +870,9 @@ static bool sculpt_modifiers_active(Scene *scene, Sculpt *sd, Object *ob)
 /**
  * \param need_mask So the DerivedMesh thats returned has mask data
  */
-void BKE_sculpt_update_mesh_elements(Scene *scene, Sculpt *sd, Object *ob,
-                                     bool need_pmap, bool need_mask)
+void BKE_sculpt_update_mesh_elements(
+        const EvaluationContext *eval_ctx, Scene *scene, Sculpt *sd, Object *ob,
+        bool need_pmap, bool need_mask)
 {
 	DerivedMesh *dm;
 	SculptSession *ss = ob->sculpt;
@@ -834,6 +882,8 @@ void BKE_sculpt_update_mesh_elements(Scene *scene, Sculpt *sd, Object *ob,
 	ss->modifiers_active = sculpt_modifiers_active(scene, sd, ob);
 	ss->show_diffuse_color = (sd->flags & SCULPT_SHOW_DIFFUSE) != 0;
 
+	ss->building_vp_handle = false;
+
 	if (need_mask) {
 		if (mmd == NULL) {
 			if (!CustomData_has_layer(&me->vdata, CD_PAINT_MASK)) {
@@ -860,9 +910,10 @@ void BKE_sculpt_update_mesh_elements(Scene *scene, Sculpt *sd, Object *ob,
 
 	ss->kb = (mmd == NULL) ? BKE_keyblock_from_object(ob) : NULL;
 
-	dm = mesh_get_derived_final(scene, ob, CD_MASK_BAREMESH);
+	dm = mesh_get_derived_final(eval_ctx, scene, ob, CD_MASK_BAREMESH);
 
-	if (mmd) {
+	/* VWPaint require mesh info for loop lookup, so require sculpt mode here */
+	if (mmd && ob->mode & OB_MODE_SCULPT) {
 		ss->multires = mmd;
 		ss->totvert = dm->getNumVerts(dm);
 		ss->totpoly = dm->getNumPolys(dm);
@@ -893,7 +944,7 @@ void BKE_sculpt_update_mesh_elements(Scene *scene, Sculpt *sd, Object *ob,
 
 			ss->orig_cos = (ss->kb) ? BKE_keyblock_convert_to_vertcos(ob, ss->kb) : BKE_mesh_vertexCos_get(me, NULL);
 
-			BKE_crazyspace_build_sculpt(scene, ob, &ss->deform_imats, &ss->deform_cos);
+			BKE_crazyspace_build_sculpt(eval_ctx, scene, ob, &ss->deform_imats, &ss->deform_cos);
 			BKE_pbvh_apply_vertCos(ss->pbvh, ss->deform_cos);
 
 			for (a = 0; a < me->totvert; ++a) {
@@ -929,6 +980,9 @@ void BKE_sculpt_update_mesh_elements(Scene *scene, Sculpt *sd, Object *ob,
 			}
 		}
 	}
+
+	/* 2.8x - avoid full mesh update! */
+	BKE_mesh_batch_cache_dirty(me, BKE_MESH_BATCH_DIRTY_SCULPT_COORDS);
 }
 
 int BKE_sculpt_mask_layers_ensure(Object *ob, MultiresModifierData *mmd)
diff --git a/source/blender/blenkernel/intern/particle.c b/source/blender/blenkernel/intern/particle.c
index 0a7ccc3ce35..7ba7c13fe40 100644
--- a/source/blender/blenkernel/intern/particle.c
+++ b/source/blender/blenkernel/intern/particle.c
@@ -255,11 +255,16 @@ struct LatticeDeformData *psys_create_lattice_deform_data(ParticleSimulationData
 	if (psys_in_edit_mode(sim->scene, sim->psys) == 0) {
 		Object *lattice = NULL;
 		ModifierData *md = (ModifierData *)psys_get_modifier(sim->ob, sim->psys);
+		int mode = G.is_rendering ? eModifierMode_Render : eModifierMode_Realtime;
 
 		for (; md; md = md->next) {
 			if (md->type == eModifierType_Lattice) {
-				LatticeModifierData *lmd = (LatticeModifierData *)md;
-				lattice = lmd->object;
+				if (md->mode & mode) {
+					LatticeModifierData *lmd = (LatticeModifierData *)md;
+					lattice = lmd->object;
+					sim->psys->lattice_strength = lmd->strength;
+				}
+
 				break;
 			}
 		}
@@ -1840,7 +1845,7 @@ void precalc_guides(ParticleSimulationData *sim, ListBase *effectors)
 	}
 }
 
-int do_guides(ParticleSettings *part, ListBase *effectors, ParticleKey *state, int index, float time)
+int do_guides(const EvaluationContext *eval_ctx, ParticleSettings *part, ListBase *effectors, ParticleKey *state, int index, float time)
 {
 	CurveMapping *clumpcurve = (part->child_flag & PART_CHILD_USE_CLUMP_CURVE) ? part->clumpcurve : NULL;
 	CurveMapping *roughcurve = (part->child_flag & PART_CHILD_USE_ROUGH_CURVE) ? part->roughcurve : NULL;
@@ -1903,7 +1908,7 @@ int do_guides(ParticleSettings *part, ListBase *effectors, ParticleKey *state, i
 		
 		/* curve taper */
 		if (cu->taperobj)
-			mul_v3_fl(vec_to_point, BKE_displist_calc_taper(eff->scene, cu->taperobj, (int)(data->strength * guidetime * 100.0f), 100));
+			mul_v3_fl(vec_to_point, BKE_displist_calc_taper(eval_ctx, eff->scene, cu->taperobj, (int)(data->strength * guidetime * 100.0f), 100));
 		
 		else { /* curve size*/
 			if (cu->flag & CU_PATH_RADIUS) {
@@ -2704,13 +2709,13 @@ void psys_cache_paths(ParticleSimulationData *sim, float cfra, const bool use_re
 			if (sim->psys->effectors && (psys->part->flag & PART_CHILD_EFFECT) == 0) {
 				for (k = 0, ca = cache[p]; k <= segments; k++, ca++)
 					/* ca is safe to cast, since only co and vel are used */
-					do_guides(sim->psys->part, sim->psys->effectors, (ParticleKey *)ca, p, (float)k / (float)segments);
+					do_guides(sim->eval_ctx, sim->psys->part, sim->psys->effectors, (ParticleKey *)ca, p, (float)k / (float)segments);
 			}
 
 			/* lattices have to be calculated separately to avoid mixups between effector calculations */
 			if (psys->lattice_deform_data) {
 				for (k = 0, ca = cache[p]; k <= segments; k++, ca++)
-					calc_latt_deform(psys->lattice_deform_data, ca->co, 1.0f);
+					calc_latt_deform(psys->lattice_deform_data, ca->co, psys->lattice_strength);
 			}
 		}
 
@@ -2752,7 +2757,7 @@ void psys_cache_paths(ParticleSimulationData *sim, float cfra, const bool use_re
 	if (vg_length)
 		MEM_freeN(vg_length);
 }
-void psys_cache_edit_paths(Scene *scene, Object *ob, PTCacheEdit *edit, float cfra, const bool use_render_params)
+void psys_cache_edit_paths(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, PTCacheEdit *edit, float cfra, const bool use_render_params)
 {
 	ParticleCacheKey *ca, **cache = edit->pathcache;
 	ParticleEditSettings *pset = &scene->toolsettings->particle;
@@ -2943,6 +2948,7 @@ void psys_cache_edit_paths(Scene *scene, Object *ob, PTCacheEdit *edit, float cf
 
 	if (psys) {
 		ParticleSimulationData sim = {0};
+		sim.eval_ctx = eval_ctx;
 		sim.scene = scene;
 		sim.ob = ob;
 		sim.psys = psys;
@@ -3300,7 +3306,7 @@ ParticleSettings *psys_new_settings(const char *name, Main *main)
 	if (main == NULL)
 		main = G.main;
 
-	part = BKE_libblock_alloc(main, ID_PA, name);
+	part = BKE_libblock_alloc(main, ID_PA, name, 0);
 	
 	default_particle_settings(part);
 
@@ -3331,38 +3337,45 @@ void BKE_particlesettings_rough_curve_init(ParticleSettings *part)
 	part->roughcurve = cumap;
 }
 
-ParticleSettings *BKE_particlesettings_copy(Main *bmain, const ParticleSettings *part)
+/**
+ * Only copy internal data of ParticleSettings ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_particlesettings_copy_data(
+        Main *UNUSED(bmain), ParticleSettings *part_dst, const ParticleSettings *part_src, const int UNUSED(flag))
 {
-	ParticleSettings *partn;
-	int a;
+	part_dst->pd = MEM_dupallocN(part_src->pd);
+	part_dst->pd2 = MEM_dupallocN(part_src->pd2);
+	part_dst->effector_weights = MEM_dupallocN(part_src->effector_weights);
+	part_dst->fluid = MEM_dupallocN(part_src->fluid);
 
-	partn = BKE_libblock_copy(bmain, &part->id);
-
-	partn->pd = MEM_dupallocN(part->pd);
-	partn->pd2 = MEM_dupallocN(part->pd2);
-	partn->effector_weights = MEM_dupallocN(part->effector_weights);
-	partn->fluid = MEM_dupallocN(part->fluid);
+	if (part_src->clumpcurve) {
+		part_dst->clumpcurve = curvemapping_copy(part_src->clumpcurve);
+	}
+	if (part_src->roughcurve) {
+		part_dst->roughcurve = curvemapping_copy(part_src->roughcurve);
+	}
 
-	if (part->clumpcurve)
-		partn->clumpcurve = curvemapping_copy(part->clumpcurve);
-	if (part->roughcurve)
-		partn->roughcurve = curvemapping_copy(part->roughcurve);
-	
-	partn->boids = boid_copy_settings(part->boids);
+	part_dst->boids = boid_copy_settings(part_src->boids);
 
-	for (a = 0; a < MAX_MTEX; a++) {
-		if (part->mtex[a]) {
-			partn->mtex[a] = MEM_mallocN(sizeof(MTex), "psys_copy_tex");
-			memcpy(partn->mtex[a], part->mtex[a], sizeof(MTex));
-			id_us_plus((ID *)partn->mtex[a]->tex);
+	for (int a = 0; a < MAX_MTEX; a++) {
+		if (part_src->mtex[a]) {
+			part_dst->mtex[a] = MEM_dupallocN(part_src->mtex[a]);
 		}
 	}
 
-	BLI_duplicatelist(&partn->dupliweights, &part->dupliweights);
-	
-	BKE_id_copy_ensure_local(bmain, &part->id, &partn->id);
+	BLI_duplicatelist(&part_dst->dupliweights, &part_src->dupliweights);
+}
 
-	return partn;
+ParticleSettings *BKE_particlesettings_copy(Main *bmain, const ParticleSettings *part)
+{
+	ParticleSettings *part_copy;
+	BKE_id_copy_ex(bmain, &part->id, (ID **)&part_copy, 0, false);
+	return part_copy;
 }
 
 void BKE_particlesettings_make_local(Main *bmain, ParticleSettings *part, const bool lib_local)
@@ -3374,7 +3387,8 @@ void BKE_particlesettings_make_local(Main *bmain, ParticleSettings *part, const
 /*			Textures							*/
 /************************************************/
 
-static int get_particle_uv(DerivedMesh *dm, ParticleData *pa, int face_index, const float fuv[4], char *name, float *texco)
+static int get_particle_uv(DerivedMesh *dm, ParticleData *pa, int index, const float fuv[4],
+                           char *name, float *texco, bool from_vert)
 {
 	MFace *mf;
 	MTFace *tf;
@@ -3390,11 +3404,15 @@ static int get_particle_uv(DerivedMesh *dm, ParticleData *pa, int face_index, co
 
 	if (pa) {
 		i = ELEM(pa->num_dmcache, DMCACHE_NOTFOUND, DMCACHE_ISCHILD) ? pa->num : pa->num_dmcache;
-		if (i >= dm->getNumTessFaces(dm))
+		if ((!from_vert && i >= dm->getNumTessFaces(dm)) ||
+		    (from_vert && i >= dm->getNumVerts(dm)))
+		{
 			i = -1;
+		}
+	}
+	else {
+		i = index;
 	}
-	else
-		i = face_index;
 
 	if (i == -1) {
 		texco[0] = 0.0f;
@@ -3402,7 +3420,22 @@ static int get_particle_uv(DerivedMesh *dm, ParticleData *pa, int face_index, co
 		texco[2] = 0.0f;
 	}
 	else {
-		mf = dm->getTessFaceData(dm, i, CD_MFACE);
+		if (from_vert) {
+			mf = dm->getTessFaceDataArray(dm, CD_MFACE);
+
+			/* This finds the first face to contain the emitting vertex,
+			 * this is not ideal, but is mostly fine as UV seams generally
+			 * map to equal-colored parts of a texture */
+			for (int j = 0; j < dm->getNumTessFaces(dm); j++, mf++) {
+				if (ELEM(i, mf->v1, mf->v2, mf->v3, mf->v4)) {
+					i = j;
+					break;
+				}
+			}
+		}
+		else {
+			mf = dm->getTessFaceData(dm, i, CD_MFACE);
+		}
 
 		psys_interpolate_uvs(&tf[i], mf->v4, fuv, texco);
 
@@ -3469,8 +3502,11 @@ static void get_cpa_texture(DerivedMesh *dm, ParticleSystem *psys, ParticleSetti
 						mul_m4_v3(mtex->object->imat, texvec);
 					break;
 				case TEXCO_UV:
-					if (fw && get_particle_uv(dm, NULL, face_index, fw, mtex->uvname, texvec))
+					if (fw && get_particle_uv(dm, NULL, face_index, fw, mtex->uvname,
+					                          texvec, (part->from == PART_FROM_VERT)))
+					{
 						break;
+					}
 					/* no break, failed to get uv's, so let's try orco's */
 					ATTR_FALLTHROUGH;
 				case TEXCO_ORCO:
@@ -3542,8 +3578,11 @@ void psys_get_texture(ParticleSimulationData *sim, ParticleData *pa, ParticleTex
 						mul_m4_v3(mtex->object->imat, texvec);
 					break;
 				case TEXCO_UV:
-					if (get_particle_uv(sim->psmd->dm_final, pa, 0, pa->fuv, mtex->uvname, texvec))
+					if (get_particle_uv(sim->psmd->dm_final, pa, 0, pa->fuv, mtex->uvname,
+					                    texvec, (part->from == PART_FROM_VERT)))
+					{
 						break;
+					}
 					/* no break, failed to get uv's, so let's try orco's */
 					ATTR_FALLTHROUGH;
 				case TEXCO_ORCO:
@@ -3748,12 +3787,12 @@ void psys_get_particle_on_path(ParticleSimulationData *sim, int p, ParticleKey *
 					mul_mat3_m4_v3(hairmat, state->vel);
 
 					if (sim->psys->effectors && (part->flag & PART_CHILD_GUIDE) == 0) {
-						do_guides(sim->psys->part, sim->psys->effectors, state, p, state->time);
+						do_guides(sim->eval_ctx, sim->psys->part, sim->psys->effectors, state, p, state->time);
 						/* TODO: proper velocity handling */
 					}
 
 					if (psys->lattice_deform_data && edit == 0)
-						calc_latt_deform(psys->lattice_deform_data, state->co, 1.0f);
+						calc_latt_deform(psys->lattice_deform_data, state->co, psys->lattice_strength);
 				}
 			}
 		}
@@ -3992,7 +4031,7 @@ int psys_get_particle_state(ParticleSimulationData *sim, int p, ParticleKey *sta
 			do_child_modifiers(NULL, sim, NULL, key1->co, key1->vel, key1->rot, par_orco, cpa, cpa->fuv, mat, state, t);
 
 			if (psys->lattice_deform_data)
-				calc_latt_deform(psys->lattice_deform_data, state->co, 1.0f);
+				calc_latt_deform(psys->lattice_deform_data, state->co, psys->lattice_strength);
 		}
 		else {
 			if (pa->state.time == cfra || ELEM(part->phystype, PART_PHYS_NO, PART_PHYS_KEYED))
@@ -4051,7 +4090,7 @@ int psys_get_particle_state(ParticleSimulationData *sim, int p, ParticleKey *sta
 			}
 
 			if (sim->psys->lattice_deform_data)
-				calc_latt_deform(sim->psys->lattice_deform_data, state->co, 1.0f);
+				calc_latt_deform(sim->psys->lattice_deform_data, state->co, psys->lattice_strength);
 		}
 		
 		return 1;
@@ -4275,9 +4314,10 @@ void psys_make_billboard(ParticleBillboardData *bb, float xvec[3], float yvec[3]
 	madd_v3_v3fl(center, yvec, bb->offset[1]);
 }
 
-void psys_apply_hair_lattice(Scene *scene, Object *ob, ParticleSystem *psys)
+void psys_apply_hair_lattice(const EvaluationContext *eval_ctx, Scene *scene, Object *ob, ParticleSystem *psys)
 {
 	ParticleSimulationData sim = {0};
+	sim.eval_ctx = eval_ctx;
 	sim.scene = scene;
 	sim.ob = ob;
 	sim.psys = psys;
@@ -4298,7 +4338,7 @@ void psys_apply_hair_lattice(Scene *scene, Object *ob, ParticleSystem *psys)
 			hkey = pa->hair;
 			for (h = 0; h < pa->totkey; h++, hkey++) {
 				mul_m4_v3(hairmat, hkey->co);
-				calc_latt_deform(psys->lattice_deform_data, hkey->co, 1.0f);
+				calc_latt_deform(psys->lattice_deform_data, hkey->co, psys->lattice_strength);
 				mul_m4_v3(imat, hkey->co);
 			}
 		}
diff --git a/source/blender/blenkernel/intern/particle_child.c b/source/blender/blenkernel/intern/particle_child.c
index bfcda89a635..d2ad05c20b7 100644
--- a/source/blender/blenkernel/intern/particle_child.c
+++ b/source/blender/blenkernel/intern/particle_child.c
@@ -702,7 +702,7 @@ void do_child_modifiers(ParticleThreadContext *ctx, ParticleSimulationData *sim,
 
 	if (part->flag & PART_CHILD_EFFECT)
 		/* state is safe to cast, since only co and vel are used */
-		guided = do_guides(sim->psys->part, sim->psys->effectors, (ParticleKey *)state, cpa->parent, t);
+		guided = do_guides(sim->eval_ctx, sim->psys->part, sim->psys->effectors, (ParticleKey *)state, cpa->parent, t);
 
 	if (guided == 0) {
 		float orco_offset[3];
diff --git a/source/blender/blenkernel/intern/particle_distribute.c b/source/blender/blenkernel/intern/particle_distribute.c
index 6603521c42f..ff8a638089f 100644
--- a/source/blender/blenkernel/intern/particle_distribute.c
+++ b/source/blender/blenkernel/intern/particle_distribute.c
@@ -39,6 +39,7 @@
 #include "BLI_jitter.h"
 #include "BLI_kdtree.h"
 #include "BLI_math.h"
+#include "BLI_math_geom.h"
 #include "BLI_rand.h"
 #include "BLI_sort.h"
 #include "BLI_task.h"
@@ -213,14 +214,22 @@ static void distribute_grid(DerivedMesh *dm, ParticleSystem *psys)
 					copy_v3_v3(co2, co1);
 					co2[a] += delta[a] + 0.001f*d;
 					co1[a] -= 0.001f*d;
-					
+
+					struct IsectRayPrecalc isect_precalc;
+					float ray_direction[3];
+					sub_v3_v3v3(ray_direction, co2, co1);
+					isect_ray_tri_watertight_v3_precalc(&isect_precalc, ray_direction);
+
 					/* lets intersect the faces */
 					for (i=0; i<totface; i++,mface++) {
 						copy_v3_v3(v1, mvert[mface->v1].co);
 						copy_v3_v3(v2, mvert[mface->v2].co);
 						copy_v3_v3(v3, mvert[mface->v3].co);
 
-						bool intersects_tri = isect_axial_line_segment_tri_v3(a, co1, co2, v2, v3, v1, &lambda);
+						bool intersects_tri = isect_ray_tri_watertight_v3(co1,
+						                                                  &isect_precalc,
+						                                                  v1, v2, v3,
+						                                                  &lambda, NULL);
 						if (intersects_tri) {
 							if (from==PART_FROM_FACE)
 								(pa+(int)(lambda*size[a])*a0mul)->flag &= ~PARS_UNEXIST;
@@ -231,7 +240,10 @@ static void distribute_grid(DerivedMesh *dm, ParticleSystem *psys)
 						if (mface->v4 && (!intersects_tri || from==PART_FROM_VOLUME)) {
 							copy_v3_v3(v4, mvert[mface->v4].co);
 
-							if (isect_axial_line_segment_tri_v3(a, co1, co2, v4, v1, v3, &lambda)) {
+							if (isect_ray_tri_watertight_v3(co1,
+							                                &isect_precalc,
+							                                v1, v3, v4,
+							                                &lambda, NULL)) {
 								if (from==PART_FROM_FACE)
 									(pa+(int)(lambda*size[a])*a0mul)->flag &= ~PARS_UNEXIST;
 								else
@@ -300,19 +312,16 @@ static void distribute_grid(DerivedMesh *dm, ParticleSystem *psys)
 static void hammersley_create(float *out, int n, int seed, float amount)
 {
 	RNG *rng;
-	double p, t, offs[2];
-	int k, kk;
+
+	double offs[2], t;
 
 	rng = BLI_rng_new(31415926 + n + seed);
 	offs[0] = BLI_rng_get_double(rng) + (double)amount;
 	offs[1] = BLI_rng_get_double(rng) + (double)amount;
 	BLI_rng_free(rng);
 
-	for (k = 0; k < n; k++) {
-		t = 0;
-		for (p = 0.5, kk = k; kk; p *= 0.5, kk >>= 1)
-			if (kk & 1) /* kk mod 2 = 1 */
-				t += p;
+	for (int k = 0; k < n; k++) {
+		BLI_hammersley_1D(k, &t);
 
 		out[2*k + 0] = fmod((double)k/(double)n + offs[0], 1.0);
 		out[2*k + 1] = fmod(t + offs[1], 1.0);
@@ -427,12 +436,37 @@ static int distribute_binary_search(float *sum, int n, float value)
 static void distribute_from_verts_exec(ParticleTask *thread, ParticleData *pa, int p)
 {
 	ParticleThreadContext *ctx= thread->ctx;
-	int rng_skip_tot= PSYS_RND_DIST_SKIP; /* count how many rng_* calls wont need skipping */
+	MFace *mface;
+
+	mface = ctx->dm->getTessFaceDataArray(ctx->dm, CD_MFACE);
+
+	int rng_skip_tot = PSYS_RND_DIST_SKIP; /* count how many rng_* calls wont need skipping */
 
 	/* TODO_PARTICLE - use original index */
-	pa->num= ctx->index[p];
-	pa->fuv[0] = 1.0f;
-	pa->fuv[1] = pa->fuv[2] = pa->fuv[3] = 0.0;
+	pa->num = ctx->index[p];
+
+	zero_v4(pa->fuv);
+
+	if (pa->num != DMCACHE_NOTFOUND && pa->num < ctx->dm->getNumVerts(ctx->dm)) {
+
+		/* This finds the first face to contain the emitting vertex,
+		 * this is not ideal, but is mostly fine as UV seams generally
+		 * map to equal-colored parts of a texture */
+		for (int i = 0; i < ctx->dm->getNumTessFaces(ctx->dm); i++, mface++) {
+			if (ELEM(pa->num, mface->v1, mface->v2, mface->v3, mface->v4)) {
+				unsigned int *vert = &mface->v1;
+
+				for (int j = 0; j < 4; j++, vert++) {
+					if (*vert == pa->num) {
+						pa->fuv[j] = 1.0f;
+						break;
+					}
+				}
+
+				break;
+			}
+		}
+	}
 	
 #if ONLY_WORKING_WITH_PA_VERTS
 	if (ctx->tree) {
@@ -873,10 +907,7 @@ static int psys_thread_context_init_distribute(ParticleThreadContext *ctx, Parti
 		else
 			dm= CDDM_from_mesh((Mesh*)ob->data);
 
-		/* BMESH ONLY, for verts we don't care about tessfaces */
-		if (from != PART_FROM_VERT) {
-			DM_ensure_tessface(dm);
-		}
+		DM_ensure_tessface(dm);
 
 		/* we need orco for consistent distributions */
 		if (!CustomData_has_layer(&dm->vertData, CD_ORCO))
@@ -1070,13 +1101,10 @@ static int psys_thread_context_init_distribute(ParticleThreadContext *ctx, Parti
 		/* This is to address tricky issues with vertex-emitting when user tries (and expects) exact 1-1 vert/part
 		 * distribution (see T47983 and its two example files). It allows us to consider pos as
 		 * 'midpoint between v and v+1' (or 'p and p+1', depending whether we have more vertices than particles or not),
-		 * and avoid stumbling over float imprecisions in element_sum. */
-		if (from == PART_FROM_VERT) {
-			pos = (totpart < totmapped) ? 0.5 / (double)totmapped : step * 0.5;  /* We choose the smaller step. */
-		}
-		else {
-			pos = 0.0;
-		}
+		 * and avoid stumbling over float imprecisions in element_sum.
+		 * Note: moved face and volume distribution to this as well (instead of starting at zero),
+		 * for the same reasons, see T52682. */
+		pos = (totpart < totmapped) ? 0.5 / (double)totmapped : step * 0.5;  /* We choose the smaller step. */
 
 		for (i = 0, p = 0; p < totpart; p++, pos += step) {
 			for ( ; (i < totmapped - 1) && (pos > (double)element_sum[i]); i++);
@@ -1115,7 +1143,7 @@ static int psys_thread_context_init_distribute(ParticleThreadContext *ctx, Parti
 		
 		if (jitlevel == 0) {
 			jitlevel= totpart/totelem;
-			if (part->flag & PART_EDISTR) jitlevel*= 2;	/* looks better in general, not very scietific */
+			if (part->flag & PART_EDISTR) jitlevel*= 2;	/* looks better in general, not very scientific */
 			if (jitlevel<3) jitlevel= 3;
 		}
 		
diff --git a/source/blender/blenkernel/intern/particle_system.c b/source/blender/blenkernel/intern/particle_system.c
index a6ed50fd0e9..ddf4f04c808 100644
--- a/source/blender/blenkernel/intern/particle_system.c
+++ b/source/blender/blenkernel/intern/particle_system.c
@@ -980,14 +980,14 @@ void psys_get_birth_coords(ParticleSimulationData *sim, ParticleData *pa, Partic
 }
 
 /* recursively evaluate emitter parent anim at cfra */
-static void evaluate_emitter_anim(Scene *scene, Object *ob, float cfra)
+static void evaluate_emitter_anim(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float cfra)
 {
 	if (ob->parent)
-		evaluate_emitter_anim(scene, ob->parent, cfra);
+		evaluate_emitter_anim(eval_ctx, scene, ob->parent, cfra);
 	
 	/* we have to force RECALC_ANIM here since where_is_objec_time only does drivers */
 	BKE_animsys_evaluate_animdata(scene, &ob->id, ob->adt, cfra, ADT_RECALC_ANIM);
-	BKE_object_where_is_calc_time(scene, ob, cfra);
+	BKE_object_where_is_calc_time(eval_ctx, scene, ob, cfra);
 }
 
 /* sets particle to the emitter surface with initial velocity & rotation */
@@ -1001,7 +1001,7 @@ void reset_particle(ParticleSimulationData *sim, ParticleData *pa, float dtime,
 	
 	/* get precise emitter matrix if particle is born */
 	if (part->type != PART_HAIR && dtime > 0.f && pa->time < cfra && pa->time >= sim->psys->cfra) {
-		evaluate_emitter_anim(sim->scene, sim->ob, pa->time);
+		evaluate_emitter_anim(sim->eval_ctx, sim->scene, sim->ob, pa->time);
 
 		psys->flag |= PSYS_OB_ANIM_RESTORE;
 	}
@@ -1133,7 +1133,8 @@ static void set_keyed_keys(ParticleSimulationData *sim)
 	int totpart = psys->totpart, k, totkeys = psys->totkeyed;
 	int keyed_flag = 0;
 
-	ksim.scene= sim->scene;
+	ksim.eval_ctx = sim->eval_ctx;
+	ksim.scene = sim->scene;
 	
 	/* no proper targets so let's clear and bail out */
 	if (psys->totkeyed==0) {
@@ -1294,7 +1295,7 @@ void psys_update_particle_tree(ParticleSystem *psys, float cfra)
 static void psys_update_effectors(ParticleSimulationData *sim)
 {
 	pdEndEffectors(&sim->psys->effectors);
-	sim->psys->effectors = pdInitEffectors(sim->scene, sim->ob, sim->psys,
+	sim->psys->effectors = pdInitEffectors(sim->eval_ctx, sim->scene, sim->ob, sim->psys,
 	                                       sim->psys->part->effector_weights, true);
 	precalc_guides(sim, sim->psys->effectors);
 }
@@ -2115,7 +2116,7 @@ static void basic_integrate(ParticleSimulationData *sim, int p, float dfra, floa
 	tkey.time=pa->state.time;
 
 	if (part->type != PART_HAIR) {
-		if (do_guides(sim->psys->part, sim->psys->effectors, &tkey, p, time)) {
+		if (do_guides(sim->eval_ctx, sim->psys->part, sim->psys->effectors, &tkey, p, time)) {
 			copy_v3_v3(pa->state.co,tkey.co);
 			/* guides don't produce valid velocity */
 			sub_v3_v3v3(pa->state.vel, tkey.co, pa->prev_state.co);
@@ -2319,21 +2320,21 @@ static void collision_point_on_surface(float p[3], ParticleCollisionElement *pce
 		}
 		case 3:
 		{
-				float p0[3], e1[3], e2[3], nor[3];
+			float p0[3], e1[3], e2[3], nor[3];
 
-				sub_v3_v3v3(e1, pce->x1, pce->x0);
-				sub_v3_v3v3(e2, pce->x2, pce->x0);
-				sub_v3_v3v3(p0, p, pce->x0);
+			sub_v3_v3v3(e1, pce->x1, pce->x0);
+			sub_v3_v3v3(e2, pce->x2, pce->x0);
+			sub_v3_v3v3(p0, p, pce->x0);
 
-				cross_v3_v3v3(nor, e1, e2);
-				normalize_v3(nor);
+			cross_v3_v3v3(nor, e1, e2);
+			normalize_v3(nor);
 
-				if (pce->inv_nor == 1)
-					negate_v3(nor);
+			if (pce->inv_nor == 1)
+				negate_v3(nor);
 
-				madd_v3_v3v3fl(co, pce->x0, nor, col->radius);
-				madd_v3_v3fl(co, e1, pce->uv[0]);
-				madd_v3_v3fl(co, e2, pce->uv[1]);
+			madd_v3_v3v3fl(co, pce->x0, nor, col->radius);
+			madd_v3_v3fl(co, e1, pce->uv[0]);
+			madd_v3_v3fl(co, e2, pce->uv[1]);
 			break;
 		}
 	}
@@ -3043,10 +3044,12 @@ static void hair_create_input_dm(ParticleSimulationData *sim, int totpoint, int
 	/* calculate maximum segment length */
 	max_length = 0.0f;
 	LOOP_PARTICLES {
-		for (k=1, key=pa->hair+1; k<pa->totkey; k++,key++) {
-			float length = len_v3v3(key->co, (key-1)->co);
-			if (max_length < length)
-				max_length = length;
+		if (!(pa->flag & PARS_UNEXIST)) {
+			for (k=1, key=pa->hair+1; k<pa->totkey; k++,key++) {
+				float length = len_v3v3(key->co, (key-1)->co);
+				if (max_length < length)
+					max_length = length;
+			}
 		}
 	}
 	
@@ -3058,76 +3061,78 @@ static void hair_create_input_dm(ParticleSimulationData *sim, int totpoint, int
 	/* make vgroup for pin roots etc.. */
 	hair_index = 1;
 	LOOP_PARTICLES {
-		float root_mat[4][4];
-		float bending_stiffness;
-		bool use_hair;
-		
-		pa->hair_index = hair_index;
-		use_hair = psys_hair_use_simulation(pa, max_length);
-		
-		psys_mat_hair_to_object(sim->ob, sim->psmd->dm_final, psys->part->from, pa, hairmat);
-		mul_m4_m4m4(root_mat, sim->ob->obmat, hairmat);
-		normalize_m4(root_mat);
-		
-		bending_stiffness = CLAMPIS(1.0f - part->bending_random * psys_frand(psys, p + 666), 0.0f, 1.0f);
-		
-		for (k=0, key=pa->hair; k<pa->totkey; k++,key++) {
-			ClothHairData *hair;
-			float *co, *co_next;
-			
-			co = key->co;
-			co_next = (key+1)->co;
-			
-			/* create fake root before actual root to resist bending */
-			if (k==0) {
-				hair = &psys->clmd->hairdata[pa->hair_index - 1];
+		if (!(pa->flag & PARS_UNEXIST)) {
+			float root_mat[4][4];
+			float bending_stiffness;
+			bool use_hair;
+
+			pa->hair_index = hair_index;
+			use_hair = psys_hair_use_simulation(pa, max_length);
+
+			psys_mat_hair_to_object(sim->ob, sim->psmd->dm_final, psys->part->from, pa, hairmat);
+			mul_m4_m4m4(root_mat, sim->ob->obmat, hairmat);
+			normalize_m4(root_mat);
+
+			bending_stiffness = CLAMPIS(1.0f - part->bending_random * psys_frand(psys, p + 666), 0.0f, 1.0f);
+
+			for (k=0, key=pa->hair; k<pa->totkey; k++,key++) {
+				ClothHairData *hair;
+				float *co, *co_next;
+
+				co = key->co;
+				co_next = (key+1)->co;
+
+				/* create fake root before actual root to resist bending */
+				if (k==0) {
+					hair = &psys->clmd->hairdata[pa->hair_index - 1];
+					copy_v3_v3(hair->loc, root_mat[3]);
+					copy_m3_m4(hair->rot, root_mat);
+
+					hair->radius = hair_radius;
+					hair->bending_stiffness = bending_stiffness;
+
+					add_v3_v3v3(mvert->co, co, co);
+					sub_v3_v3(mvert->co, co_next);
+					mul_m4_v3(hairmat, mvert->co);
+
+					medge->v1 = pa->hair_index - 1;
+					medge->v2 = pa->hair_index;
+
+					dvert = hair_set_pinning(dvert, 1.0f);
+
+					mvert++;
+					medge++;
+				}
+
+				/* store root transform in cloth data */
+				hair = &psys->clmd->hairdata[pa->hair_index + k];
 				copy_v3_v3(hair->loc, root_mat[3]);
 				copy_m3_m4(hair->rot, root_mat);
-				
+
 				hair->radius = hair_radius;
 				hair->bending_stiffness = bending_stiffness;
-				
-				add_v3_v3v3(mvert->co, co, co);
-				sub_v3_v3(mvert->co, co_next);
+
+				copy_v3_v3(mvert->co, co);
 				mul_m4_v3(hairmat, mvert->co);
-				
-				medge->v1 = pa->hair_index - 1;
-				medge->v2 = pa->hair_index;
-				
-				dvert = hair_set_pinning(dvert, 1.0f);
-				
+
+				if (k) {
+					medge->v1 = pa->hair_index + k - 1;
+					medge->v2 = pa->hair_index + k;
+				}
+
+				/* roots and disabled hairs should be 1.0, the rest can be anything from 0.0 to 1.0 */
+				if (use_hair)
+					dvert = hair_set_pinning(dvert, key->weight);
+				else
+					dvert = hair_set_pinning(dvert, 1.0f);
+
 				mvert++;
-				medge++;
-			}
-			
-			/* store root transform in cloth data */
-			hair = &psys->clmd->hairdata[pa->hair_index + k];
-			copy_v3_v3(hair->loc, root_mat[3]);
-			copy_m3_m4(hair->rot, root_mat);
-			
-			hair->radius = hair_radius;
-			hair->bending_stiffness = bending_stiffness;
-			
-			copy_v3_v3(mvert->co, co);
-			mul_m4_v3(hairmat, mvert->co);
-			
-			if (k) {
-				medge->v1 = pa->hair_index + k - 1;
-				medge->v2 = pa->hair_index + k;
+				if (k)
+					medge++;
 			}
-			
-			/* roots and disabled hairs should be 1.0, the rest can be anything from 0.0 to 1.0 */
-			if (use_hair)
-				dvert = hair_set_pinning(dvert, key->weight);
-			else
-				dvert = hair_set_pinning(dvert, 1.0f);
-			
-			mvert++;
-			if (k)
-				medge++;
+
+			hair_index += pa->totkey + 1;
 		}
-		
-		hair_index += pa->totkey + 1;
 	}
 }
 
@@ -3153,9 +3158,11 @@ static void do_hair_dynamics(ParticleSimulationData *sim)
 	totpoint = 0;
 	totedge = 0;
 	LOOP_PARTICLES {
-		/* "out" dm contains all hairs */
-		totedge += pa->totkey;
-		totpoint += pa->totkey + 1; /* +1 for virtual root point */
+		if (!(pa->flag & PARS_UNEXIST)) {
+			/* "out" dm contains all hairs */
+			totedge += pa->totkey;
+			totpoint += pa->totkey + 1; /* +1 for virtual root point */
+		}
 	}
 	
 	realloc_roots = false; /* whether hair root info array has to be reallocated */
@@ -3191,7 +3198,7 @@ static void do_hair_dynamics(ParticleSimulationData *sim)
 	psys->hair_out_dm = CDDM_copy(psys->hair_in_dm);
 	psys->hair_out_dm->getVertCos(psys->hair_out_dm, deformedVerts);
 	
-	clothModifier_do(psys->clmd, sim->scene, sim->ob, psys->hair_in_dm, deformedVerts);
+	clothModifier_do(psys->clmd, sim->eval_ctx, sim->scene, sim->ob, psys->hair_in_dm, deformedVerts);
 	
 	CDDM_apply_vert_coords(psys->hair_out_dm, deformedVerts);
 	
@@ -4151,7 +4158,7 @@ static int hair_needs_recalc(ParticleSystem *psys)
 
 /* main particle update call, checks that things are ok on the large scale and
  * then advances in to actual particle calculations depending on particle type */
-void particle_system_update(Scene *scene, Object *ob, ParticleSystem *psys, const bool use_render_params)
+void particle_system_update(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, ParticleSystem *psys, const bool use_render_params)
 {
 	ParticleSimulationData sim= {0};
 	ParticleSettings *part = psys->part;
@@ -4165,10 +4172,11 @@ void particle_system_update(Scene *scene, Object *ob, ParticleSystem *psys, cons
 
 	cfra= BKE_scene_frame_get(scene);
 
-	sim.scene= scene;
-	sim.ob= ob;
-	sim.psys= psys;
-	sim.psmd= psys_get_modifier(ob, psys);
+	sim.eval_ctx = eval_ctx;
+	sim.scene = scene;
+	sim.ob = ob;
+	sim.psys = psys;
+	sim.psmd = psys_get_modifier(ob, psys);
 
 	/* system was already updated from modifier stack */
 	if (sim.psmd->flag & eParticleSystemFlag_psys_updated) {
@@ -4311,7 +4319,7 @@ void particle_system_update(Scene *scene, Object *ob, ParticleSystem *psys, cons
 
 	/* make sure emitter is left at correct time (particle emission can change this) */
 	if (psys->flag & PSYS_OB_ANIM_RESTORE) {
-		evaluate_emitter_anim(scene, ob, cfra);
+		evaluate_emitter_anim(eval_ctx, scene, ob, cfra);
 		psys->flag &= ~PSYS_OB_ANIM_RESTORE;
 	}
 
@@ -4353,13 +4361,30 @@ void BKE_particlesystem_id_loop(ParticleSystem *psys, ParticleSystemIDFunc func,
 
 /* **** Depsgraph evaluation **** */
 
-void BKE_particle_system_eval(struct EvaluationContext *UNUSED(eval_ctx),
-                              Scene *scene,
-                              Object *ob,
-                              ParticleSystem *psys)
+void BKE_particle_system_settings_eval(const struct EvaluationContext *UNUSED(eval_ctx),
+                                       ParticleSystem *psys)
+{
+	if (G.debug & G_DEBUG_DEPSGRAPH) {
+		printf("%s on %s (%p)\n", __func__, psys->name, psys);
+	}
+	psys->recalc |= psys->part->recalc;
+}
+
+void BKE_particle_system_settings_recalc_clear(struct EvaluationContext *UNUSED(eval_ctx),
+                                               ParticleSettings *particle_settings)
+{
+	if (G.debug & G_DEBUG_DEPSGRAPH) {
+		printf("%s on %s (%p)\n", __func__, particle_settings->id.name, particle_settings);
+	}
+	particle_settings->recalc = 0;
+}
+
+void BKE_particle_system_eval_init(const struct EvaluationContext *UNUSED(eval_ctx),
+                                   Scene *scene,
+                                   Object *ob)
 {
 	if (G.debug & G_DEBUG_DEPSGRAPH) {
-		printf("%s on %s:%s\n", __func__, ob->id.name, psys->name);
+		printf("%s on %s (%p)\n", __func__, ob->id.name, ob);
 	}
 	BKE_ptcache_object_reset(scene, ob, PTCACHE_RESET_DEPSGRAPH);
 }
diff --git a/source/blender/blenkernel/intern/pbvh.c b/source/blender/blenkernel/intern/pbvh.c
index ef2eaf8405b..6fc89eb778a 100644
--- a/source/blender/blenkernel/intern/pbvh.c
+++ b/source/blender/blenkernel/intern/pbvh.c
@@ -34,6 +34,7 @@
 
 #include "BKE_pbvh.h"
 #include "BKE_ccg.h"
+#include "BKE_subsurf.h"
 #include "BKE_DerivedMesh.h"
 #include "BKE_global.h"
 #include "BKE_mesh.h" /* for BKE_mesh_calc_normals */
@@ -607,6 +608,11 @@ void BKE_pbvh_build_grids(PBVH *bvh, CCGElem **grids,
 	MEM_freeN(prim_bbc);
 }
 
+void BKE_pbvh_set_ccgdm(PBVH *bvh, CCGDerivedMesh *ccgdm)
+{
+	bvh->ccgdm = ccgdm;
+}
+
 PBVH *BKE_pbvh_new(void)
 {
 	PBVH *bvh = MEM_callocN(sizeof(PBVH), "pbvh");
@@ -1157,7 +1163,7 @@ static void pbvh_update_draw_buffers(PBVH *bvh, PBVHNode **nodes, int totnode)
 	}
 }
 
-static void pbvh_draw_BB(PBVH *bvh)
+void BKE_pbvh_draw_BB(PBVH *bvh)
 {
 	unsigned int pos = GWN_vertformat_attr_add(immVertexFormat(), "pos", GWN_COMP_F32, 3, GWN_FETCH_FLOAT);
 	immBindBuiltinProgram(GPU_SHADER_3D_UNIFORM_COLOR);
@@ -1331,6 +1337,12 @@ void BKE_pbvh_get_grid_key(const PBVH *bvh, CCGKey *key)
 	*key = bvh->gridkey;
 }
 
+CCGDerivedMesh *BKE_pbvh_get_ccgdm(const PBVH *bvh)
+{
+	return bvh->ccgdm;
+}
+
+
 BMesh *BKE_pbvh_get_bmesh(PBVH *bvh)
 {
 	BLI_assert(bvh->type == PBVH_BMESH);
@@ -1529,14 +1541,16 @@ void BKE_pbvh_raycast(
 bool ray_face_intersection_quad(
         const float ray_start[3], const float ray_normal[3],
         const float t0[3], const float t1[3], const float t2[3], const float t3[3],
-        float *dist)
+        float *depth)
 {
-	float dist_test;
+	float depth_test;
 
-	if ((isect_ray_tri_epsilon_v3(ray_start, ray_normal, t0, t1, t2, &dist_test, NULL, 0.1f) && (dist_test < *dist)) ||
-	    (isect_ray_tri_epsilon_v3(ray_start, ray_normal, t0, t2, t3, &dist_test, NULL, 0.1f) && (dist_test < *dist)))
+	if ((isect_ray_tri_epsilon_v3(
+	         ray_start, ray_normal, t0, t1, t2, &depth_test, NULL, 0.1f) && (depth_test < *depth)) ||
+	    (isect_ray_tri_epsilon_v3(
+	         ray_start, ray_normal, t0, t2, t3, &depth_test, NULL, 0.1f) && (depth_test < *depth)))
 	{
-		*dist = dist_test;
+		*depth = depth_test;
 		return true;
 	}
 	else {
@@ -1547,12 +1561,82 @@ bool ray_face_intersection_quad(
 bool ray_face_intersection_tri(
         const float ray_start[3], const float ray_normal[3],
         const float t0[3], const float t1[3], const float t2[3],
-        float *dist)
+        float *depth)
+{
+	float depth_test;
+
+	if ((isect_ray_tri_epsilon_v3(
+	         ray_start, ray_normal, t0, t1, t2, &depth_test, NULL, 0.1f) && (depth_test < *depth)))
+	{
+		*depth = depth_test;
+		return true;
+	}
+	else {
+		return false;
+	}
+}
+
+/* Take advantage of the fact we know this wont be an intersection.
+ * Just handle ray-tri edges. */
+static float dist_squared_ray_to_tri_v3_fast(
+        const float ray_origin[3], const float ray_direction[3],
+        const float v0[3], const float v1[3], const float v2[3],
+        float r_point[3], float *r_depth)
+{
+	const float *tri[3] = {v0, v1, v2};
+	float dist_sq_best = FLT_MAX;
+	for (int i = 0, j = 2; i < 3; j = i++) {
+		float point_test[3], depth_test = FLT_MAX;
+		const float dist_sq_test = dist_squared_ray_to_seg_v3(
+		        ray_origin, ray_direction, tri[i], tri[j], point_test, &depth_test);
+		if (dist_sq_test < dist_sq_best || i == 0) {
+			copy_v3_v3(r_point, point_test);
+			*r_depth = depth_test;
+			dist_sq_best = dist_sq_test;
+		}
+	}
+	return dist_sq_best;
+}
+
+bool ray_face_nearest_quad(
+        const float ray_start[3], const float ray_normal[3],
+        const float t0[3], const float t1[3], const float t2[3], const float t3[3],
+        float *depth, float *dist_sq)
+{
+	float dist_sq_test;
+	float co[3], depth_test;
+
+	if (((dist_sq_test = dist_squared_ray_to_tri_v3_fast(
+	         ray_start, ray_normal, t0, t1, t2, co, &depth_test)) < *dist_sq))
+	{
+		*dist_sq = dist_sq_test;
+		*depth = depth_test;
+		if (((dist_sq_test = dist_squared_ray_to_tri_v3_fast(
+		         ray_start, ray_normal, t0, t2, t3, co, &depth_test)) < *dist_sq))
+		{
+			*dist_sq = dist_sq_test;
+			*depth = depth_test;
+		}
+		return true;
+	}
+	else {
+		return false;
+	}
+}
+
+bool ray_face_nearest_tri(
+        const float ray_start[3], const float ray_normal[3],
+        const float t0[3], const float t1[3], const float t2[3],
+        float *depth, float *dist_sq)
 {
-	float dist_test;
+	float dist_sq_test;
+	float co[3], depth_test;
 
-	if ((isect_ray_tri_epsilon_v3(ray_start, ray_normal, t0, t1, t2, &dist_test, NULL, 0.1f) && (dist_test < *dist))) {
-		*dist = dist_test;
+	if (((dist_sq_test = dist_squared_ray_to_tri_v3_fast(
+	         ray_start, ray_normal, t0, t1, t2, co, &depth_test)) < *dist_sq))
+	{
+		*dist_sq = dist_sq_test;
+		*depth = depth_test;
 		return true;
 	}
 	else {
@@ -1564,7 +1648,7 @@ static bool pbvh_faces_node_raycast(
         PBVH *bvh, const PBVHNode *node,
         float (*origco)[3],
         const float ray_start[3], const float ray_normal[3],
-        float *dist)
+        float *depth)
 {
 	const MVert *vert = bvh->verts;
 	const MLoop *mloop = bvh->mloop;
@@ -1586,7 +1670,7 @@ static bool pbvh_faces_node_raycast(
 			        origco[face_verts[0]],
 			        origco[face_verts[1]],
 			        origco[face_verts[2]],
-			        dist);
+			        depth);
 		}
 		else {
 			/* intersect with current coordinates */
@@ -1595,7 +1679,7 @@ static bool pbvh_faces_node_raycast(
 			        vert[mloop[lt->tri[0]].v].co,
 			        vert[mloop[lt->tri[1]].v].co,
 			        vert[mloop[lt->tri[2]].v].co,
-			        dist);
+			        depth);
 		}
 	}
 
@@ -1606,7 +1690,7 @@ static bool pbvh_grids_node_raycast(
         PBVH *bvh, PBVHNode *node,
         float (*origco)[3],
         const float ray_start[3], const float ray_normal[3],
-        float *dist)
+        float *depth)
 {
 	const int totgrid = node->totprim;
 	const int gridsize = bvh->gridkey.grid_size;
@@ -1636,7 +1720,7 @@ static bool pbvh_grids_node_raycast(
 					        origco[y * gridsize + x + 1],
 					        origco[(y + 1) * gridsize + x + 1],
 					        origco[(y + 1) * gridsize + x],
-					        dist);
+					        depth);
 				}
 				else {
 					hit |= ray_face_intersection_quad(
@@ -1645,7 +1729,7 @@ static bool pbvh_grids_node_raycast(
 					        CCG_grid_elem_co(&bvh->gridkey, grid, x + 1, y),
 					        CCG_grid_elem_co(&bvh->gridkey, grid, x + 1, y + 1),
 					        CCG_grid_elem_co(&bvh->gridkey, grid, x, y + 1),
-					        dist);
+					        depth);
 				}
 			}
 		}
@@ -1660,7 +1744,7 @@ static bool pbvh_grids_node_raycast(
 bool BKE_pbvh_node_raycast(
         PBVH *bvh, PBVHNode *node, float (*origco)[3], bool use_origco,
         const float ray_start[3], const float ray_normal[3],
-        float *dist)
+        float *depth)
 {
 	bool hit = false;
 
@@ -1671,16 +1755,16 @@ bool BKE_pbvh_node_raycast(
 		case PBVH_FACES:
 			hit |= pbvh_faces_node_raycast(
 			        bvh, node, origco,
-			        ray_start, ray_normal, dist);
+			        ray_start, ray_normal, depth);
 			break;
 		case PBVH_GRIDS:
 			hit |= pbvh_grids_node_raycast(
 			        bvh, node, origco,
-			        ray_start, ray_normal, dist);
+			        ray_start, ray_normal, depth);
 			break;
 		case PBVH_BMESH:
 			hit = pbvh_bmesh_node_raycast(
-			        node, ray_start, ray_normal, dist, use_origco);
+			        node, ray_start, ray_normal, depth, use_origco);
 			break;
 	}
 
@@ -1731,6 +1815,176 @@ void BKE_pbvh_raycast_project_ray_root(
 	}
 }
 
+/* -------------------------------------------------------------------- */
+
+typedef struct {
+	struct DistRayAABB_Precalc dist_ray_to_aabb_precalc;
+	bool original;
+} FindNearestRayData;
+
+static bool nearest_to_ray_aabb_dist_sq(PBVHNode *node, void *data_v)
+{
+	FindNearestRayData *rcd = data_v;
+	const float *bb_min, *bb_max;
+
+	if (rcd->original) {
+		/* BKE_pbvh_node_get_original_BB */
+		bb_min = node->orig_vb.bmin;
+		bb_max = node->orig_vb.bmax;
+	}
+	else {
+		/* BKE_pbvh_node_get_BB */
+		bb_min = node->vb.bmin;
+		bb_max = node->vb.bmax;
+	}
+
+	float co_dummy[3], depth;
+	node->tmin = dist_squared_ray_to_aabb_v3(&rcd->dist_ray_to_aabb_precalc, bb_min, bb_max, co_dummy, &depth);
+	/* Ideally we would skip distances outside the range. */
+	return depth > 0.0f;
+}
+
+void BKE_pbvh_find_nearest_to_ray(
+        PBVH *bvh, BKE_pbvh_SearchNearestCallback cb, void *data,
+        const float ray_start[3], const float ray_normal[3],
+        bool original)
+{
+	FindNearestRayData ncd;
+
+	dist_squared_ray_to_aabb_v3_precalc(&ncd.dist_ray_to_aabb_precalc, ray_start, ray_normal);
+	ncd.original = original;
+
+	BKE_pbvh_search_callback_occluded(bvh, nearest_to_ray_aabb_dist_sq, &ncd, cb, data);
+}
+
+
+static bool pbvh_faces_node_nearest_to_ray(
+        PBVH *bvh, const PBVHNode *node,
+        float (*origco)[3],
+        const float ray_start[3], const float ray_normal[3],
+        float *depth, float *dist_sq)
+{
+	const MVert *vert = bvh->verts;
+	const MLoop *mloop = bvh->mloop;
+	const int *faces = node->prim_indices;
+	int i, totface = node->totprim;
+	bool hit = false;
+
+	for (i = 0; i < totface; ++i) {
+		const MLoopTri *lt = &bvh->looptri[faces[i]];
+		const int *face_verts = node->face_vert_indices[i];
+
+		if (paint_is_face_hidden(lt, vert, mloop))
+			continue;
+
+		if (origco) {
+			/* intersect with backuped original coordinates */
+			hit |= ray_face_nearest_tri(
+			        ray_start, ray_normal,
+			        origco[face_verts[0]],
+			        origco[face_verts[1]],
+			        origco[face_verts[2]],
+			        depth, dist_sq);
+		}
+		else {
+			/* intersect with current coordinates */
+			hit |= ray_face_nearest_tri(
+			        ray_start, ray_normal,
+			        vert[mloop[lt->tri[0]].v].co,
+			        vert[mloop[lt->tri[1]].v].co,
+			        vert[mloop[lt->tri[2]].v].co,
+			        depth, dist_sq);
+		}
+	}
+
+	return hit;
+}
+
+static bool pbvh_grids_node_nearest_to_ray(
+        PBVH *bvh, PBVHNode *node,
+        float (*origco)[3],
+        const float ray_start[3], const float ray_normal[3],
+        float *depth, float *dist_sq)
+{
+	const int totgrid = node->totprim;
+	const int gridsize = bvh->gridkey.grid_size;
+	bool hit = false;
+
+	for (int i = 0; i < totgrid; ++i) {
+		CCGElem *grid = bvh->grids[node->prim_indices[i]];
+		BLI_bitmap *gh;
+
+		if (!grid)
+			continue;
+
+		gh = bvh->grid_hidden[node->prim_indices[i]];
+
+		for (int y = 0; y < gridsize - 1; ++y) {
+			for (int x = 0; x < gridsize - 1; ++x) {
+				/* check if grid face is hidden */
+				if (gh) {
+					if (paint_is_grid_face_hidden(gh, gridsize, x, y))
+						continue;
+				}
+
+				if (origco) {
+					hit |= ray_face_nearest_quad(
+					        ray_start, ray_normal,
+					        origco[y * gridsize + x],
+					        origco[y * gridsize + x + 1],
+					        origco[(y + 1) * gridsize + x + 1],
+					        origco[(y + 1) * gridsize + x],
+					        depth, dist_sq);
+				}
+				else {
+					hit |= ray_face_nearest_quad(
+					        ray_start, ray_normal,
+					        CCG_grid_elem_co(&bvh->gridkey, grid, x, y),
+					        CCG_grid_elem_co(&bvh->gridkey, grid, x + 1, y),
+					        CCG_grid_elem_co(&bvh->gridkey, grid, x + 1, y + 1),
+					        CCG_grid_elem_co(&bvh->gridkey, grid, x, y + 1),
+					        depth, dist_sq);
+				}
+			}
+		}
+
+		if (origco)
+			origco += gridsize * gridsize;
+	}
+
+	return hit;
+}
+
+bool BKE_pbvh_node_find_nearest_to_ray(
+        PBVH *bvh, PBVHNode *node, float (*origco)[3], bool use_origco,
+        const float ray_start[3], const float ray_normal[3],
+        float *depth, float *dist_sq)
+{
+	bool hit = false;
+
+	if (node->flag & PBVH_FullyHidden)
+		return false;
+
+	switch (bvh->type) {
+		case PBVH_FACES:
+			hit |= pbvh_faces_node_nearest_to_ray(
+			        bvh, node, origco,
+			        ray_start, ray_normal, depth, dist_sq);
+			break;
+		case PBVH_GRIDS:
+			hit |= pbvh_grids_node_nearest_to_ray(
+			        bvh, node, origco,
+			        ray_start, ray_normal, depth, dist_sq);
+			break;
+		case PBVH_BMESH:
+			hit = pbvh_bmesh_node_nearest_to_ray(
+			        node, ray_start, ray_normal, depth, dist_sq, use_origco);
+			break;
+	}
+
+	return hit;
+}
+
 typedef struct {
 	DMSetMaterial setMaterial;
 	bool wireframe;
@@ -1844,7 +2098,7 @@ void BKE_pbvh_draw(PBVH *bvh, float (*planes)[4], float (*fnors)[3],
 	}
 
 	if (G.debug_value == 14)
-		pbvh_draw_BB(bvh);
+		BKE_pbvh_draw_BB(bvh);
 }
 
 struct PBVHNodeDrawCallbackData {
diff --git a/source/blender/blenkernel/intern/pbvh_bmesh.c b/source/blender/blenkernel/intern/pbvh_bmesh.c
index c5e49883dc6..187891e7210 100644
--- a/source/blender/blenkernel/intern/pbvh_bmesh.c
+++ b/source/blender/blenkernel/intern/pbvh_bmesh.c
@@ -718,20 +718,24 @@ static void pbvh_bmesh_node_drop_orig(PBVHNode *node)
 
 /****************************** EdgeQueue *****************************/
 
-typedef struct {
+struct EdgeQueue;
+
+typedef struct EdgeQueue {
 	Heap *heap;
 	const float *center;
+	float  center_proj[3];  /* for when we use projected coords. */
 	float radius_squared;
 	float limit_len_squared;
 #ifdef USE_EDGEQUEUE_EVEN_SUBDIV
 	float limit_len;
 #endif
 
-#ifdef USE_EDGEQUEUE_FRONTFACE
+	bool (*edge_queue_tri_in_range)(const struct EdgeQueue *q, BMFace *f);
+
 	const float *view_normal;
+#ifdef USE_EDGEQUEUE_FRONTFACE
 	unsigned int use_view_normal : 1;
 #endif
-
 } EdgeQueue;
 
 typedef struct {
@@ -785,7 +789,6 @@ static bool edge_queue_tri_in_sphere(const EdgeQueue *q, BMFace *f)
 	float c[3];
 
 	/* Get closest point in triangle to sphere center */
-	// BM_iter_as_array(NULL, BM_VERTS_OF_FACE, f, (void **)v_tri, 3);
 	BM_face_as_array_vert_tri(f, v_tri);
 
 	closest_on_tri_to_point_v3(c, q->center, v_tri[0]->co, v_tri[1]->co, v_tri[2]->co);
@@ -794,6 +797,25 @@ static bool edge_queue_tri_in_sphere(const EdgeQueue *q, BMFace *f)
 	return len_squared_v3v3(q->center, c) <= q->radius_squared;
 }
 
+static bool edge_queue_tri_in_circle(const EdgeQueue *q, BMFace *f)
+{
+	BMVert *v_tri[3];
+	float c[3];
+	float tri_proj[3][3];
+
+	/* Get closest point in triangle to sphere center */
+	BM_face_as_array_vert_tri(f, v_tri);
+
+	project_plane_normalized_v3_v3v3(tri_proj[0], v_tri[0]->co, q->view_normal);
+	project_plane_normalized_v3_v3v3(tri_proj[1], v_tri[1]->co, q->view_normal);
+	project_plane_normalized_v3_v3v3(tri_proj[2], v_tri[2]->co, q->view_normal);
+
+	closest_on_tri_to_point_v3(c, q->center_proj, tri_proj[0], tri_proj[1], tri_proj[2]);
+
+	/* Check if triangle intersects the sphere */
+	return len_squared_v3v3(q->center_proj, c) <= q->radius_squared;
+}
+
 /* Return true if the vertex mask is less than 1.0, false otherwise */
 static bool check_mask(EdgeQueueContext *eq_ctx, BMVert *v)
 {
@@ -929,7 +951,7 @@ static void long_edge_queue_face_add(
 	}
 #endif
 
-	if (edge_queue_tri_in_sphere(eq_ctx->q, f)) {
+	if (eq_ctx->q->edge_queue_tri_in_range(eq_ctx->q, f)) {
 		/* Check each edge of the face */
 		BMLoop *l_first = BM_FACE_FIRST_LOOP(f);
 		BMLoop *l_iter = l_first;
@@ -960,7 +982,7 @@ static void short_edge_queue_face_add(
 	}
 #endif
 
-	if (edge_queue_tri_in_sphere(eq_ctx->q, f)) {
+	if (eq_ctx->q->edge_queue_tri_in_range(eq_ctx->q, f)) {
 		BMLoop *l_iter;
 		BMLoop *l_first;
 
@@ -984,7 +1006,7 @@ static void short_edge_queue_face_add(
 static void long_edge_queue_create(
         EdgeQueueContext *eq_ctx,
         PBVH *bvh, const float center[3], const float view_normal[3],
-        float radius)
+        float radius, const bool use_frontface, const bool use_projected)
 {
 	eq_ctx->q->heap = BLI_heap_new();
 	eq_ctx->q->center = center;
@@ -994,13 +1016,22 @@ static void long_edge_queue_create(
 	eq_ctx->q->limit_len = bvh->bm_max_edge_len;
 #endif
 
-#ifdef USE_EDGEQUEUE_FRONTFACE
 	eq_ctx->q->view_normal = view_normal;
-	eq_ctx->q->use_view_normal = (view_normal != NULL);
+
+#ifdef USE_EDGEQUEUE_FRONTFACE
+	eq_ctx->q->use_view_normal = use_frontface;
 #else
-	UNUSED_VARS(view_normal);
+	UNUSED_VARS(use_frontface);
 #endif
 
+	if (use_projected) {
+		eq_ctx->q->edge_queue_tri_in_range = edge_queue_tri_in_circle;
+		project_plane_normalized_v3_v3v3(eq_ctx->q->center_proj, center, view_normal);
+	}
+	else {
+		eq_ctx->q->edge_queue_tri_in_range = edge_queue_tri_in_sphere;
+	}
+
 #ifdef USE_EDGEQUEUE_TAG_VERIFY
 	pbvh_bmesh_edge_tag_verify(bvh);
 #endif
@@ -1037,7 +1068,7 @@ static void long_edge_queue_create(
 static void short_edge_queue_create(
         EdgeQueueContext *eq_ctx,
         PBVH *bvh, const float center[3], const float view_normal[3],
-        float radius)
+        float radius, const bool use_frontface, const bool use_projected)
 {
 	eq_ctx->q->heap = BLI_heap_new();
 	eq_ctx->q->center = center;
@@ -1047,13 +1078,22 @@ static void short_edge_queue_create(
 	eq_ctx->q->limit_len = bvh->bm_min_edge_len;
 #endif
 
-#ifdef USE_EDGEQUEUE_FRONTFACE
 	eq_ctx->q->view_normal = view_normal;
-	eq_ctx->q->use_view_normal = (view_normal != NULL);
+
+#ifdef USE_EDGEQUEUE_FRONTFACE
+	eq_ctx->q->use_view_normal = use_frontface;
 #else
-	UNUSED_VARS(view_normal);
+	UNUSED_VARS(use_frontface);
 #endif
 
+	if (use_projected) {
+		eq_ctx->q->edge_queue_tri_in_range = edge_queue_tri_in_circle;
+		project_plane_normalized_v3_v3v3(eq_ctx->q->center_proj, center, view_normal);
+	}
+	else {
+		eq_ctx->q->edge_queue_tri_in_range = edge_queue_tri_in_sphere;
+	}
+
 	for (int n = 0; n < bvh->totnode; n++) {
 		PBVHNode *node = &bvh->nodes[n];
 
@@ -1466,7 +1506,7 @@ static bool pbvh_bmesh_collapse_short_edges(
 
 bool pbvh_bmesh_node_raycast(
         PBVHNode *node, const float ray_start[3],
-        const float ray_normal[3], float *dist,
+        const float ray_normal[3], float *depth,
         bool use_original)
 {
 	bool hit = false;
@@ -1479,7 +1519,7 @@ bool pbvh_bmesh_node_raycast(
 			        node->bm_orco[t[0]],
 			        node->bm_orco[t[1]],
 			        node->bm_orco[t[2]],
-			        dist);
+			        depth);
 		}
 	}
 	else {
@@ -1498,7 +1538,7 @@ bool pbvh_bmesh_node_raycast(
 				        v_tri[0]->co,
 				        v_tri[1]->co,
 				        v_tri[2]->co,
-				        dist);
+				        depth);
 			}
 		}
 	}
@@ -1509,7 +1549,7 @@ bool pbvh_bmesh_node_raycast(
 bool BKE_pbvh_bmesh_node_raycast_detail(
         PBVHNode *node,
         const float ray_start[3], const float ray_normal[3],
-        float *dist, float *r_detail)
+        float *depth, float *r_detail)
 {
 	if (node->flag & PBVH_FullyHidden)
 		return 0;
@@ -1531,7 +1571,7 @@ bool BKE_pbvh_bmesh_node_raycast_detail(
 			        v_tri[0]->co,
 			        v_tri[1]->co,
 			        v_tri[2]->co,
-			        dist);
+			        depth);
 
 			if (hit_local) {
 				f_hit = f;
@@ -1554,6 +1594,47 @@ bool BKE_pbvh_bmesh_node_raycast_detail(
 	return hit;
 }
 
+bool pbvh_bmesh_node_nearest_to_ray(
+        PBVHNode *node, const float ray_start[3],
+        const float ray_normal[3], float *depth, float *dist_sq,
+        bool use_original)
+{
+	bool hit = false;
+
+	if (use_original && node->bm_tot_ortri) {
+		for (int i = 0; i < node->bm_tot_ortri; i++) {
+			const int *t = node->bm_ortri[i];
+			hit |= ray_face_nearest_tri(
+			        ray_start, ray_normal,
+			        node->bm_orco[t[0]],
+			        node->bm_orco[t[1]],
+			        node->bm_orco[t[2]],
+			        depth, dist_sq);
+		}
+	}
+	else {
+		GSetIterator gs_iter;
+
+		GSET_ITER (gs_iter, node->bm_faces) {
+			BMFace *f = BLI_gsetIterator_getKey(&gs_iter);
+
+			BLI_assert(f->len == 3);
+			if (!BM_elem_flag_test(f, BM_ELEM_HIDDEN)) {
+				BMVert *v_tri[3];
+
+				BM_face_as_array_vert_tri(f, v_tri);
+				hit |= ray_face_nearest_tri(
+				        ray_start, ray_normal,
+				        v_tri[0]->co,
+				        v_tri[1]->co,
+				        v_tri[2]->co,
+				        depth, dist_sq);
+			}
+		}
+	}
+
+	return hit;
+}
 
 void pbvh_bmesh_normals_update(PBVHNode **nodes, int totnode)
 {
@@ -1854,7 +1935,7 @@ void BKE_pbvh_build_bmesh(
 bool BKE_pbvh_bmesh_update_topology(
         PBVH *bvh, PBVHTopologyUpdateMode mode,
         const float center[3], const float view_normal[3],
-        float radius)
+        float radius, const bool use_frontface, const bool use_projected)
 {
 	/* 2 is enough for edge faces - manifold edge */
 	BLI_buffer_declare_static(BMLoop *, edge_loops, BLI_BUFFER_NOP, 2);
@@ -1877,7 +1958,7 @@ bool BKE_pbvh_bmesh_update_topology(
 		    cd_vert_mask_offset, cd_vert_node_offset, cd_face_node_offset,
 		};
 
-		short_edge_queue_create(&eq_ctx, bvh, center, view_normal, radius);
+		short_edge_queue_create(&eq_ctx, bvh, center, view_normal, radius, use_frontface, use_projected);
 		modified |= pbvh_bmesh_collapse_short_edges(
 		        &eq_ctx, bvh, &deleted_faces);
 		BLI_heap_free(q.heap, NULL);
@@ -1892,7 +1973,7 @@ bool BKE_pbvh_bmesh_update_topology(
 		    cd_vert_mask_offset, cd_vert_node_offset, cd_face_node_offset,
 		};
 
-		long_edge_queue_create(&eq_ctx, bvh, center, view_normal, radius);
+		long_edge_queue_create(&eq_ctx, bvh, center, view_normal, radius, use_frontface, use_projected);
 		modified |= pbvh_bmesh_subdivide_long_edges(
 		        &eq_ctx, bvh, &edge_loops);
 		BLI_heap_free(q.heap, NULL);
diff --git a/source/blender/blenkernel/intern/pbvh_intern.h b/source/blender/blenkernel/intern/pbvh_intern.h
index 19d3b31bd31..e05a3068682 100644
--- a/source/blender/blenkernel/intern/pbvh_intern.h
+++ b/source/blender/blenkernel/intern/pbvh_intern.h
@@ -149,6 +149,8 @@ struct PBVH {
 	 * objects in sculpt mode with different sizes at the same time, so now storing that common gpu buffer
 	 * in an opaque pointer per pbvh. See T47637. */
 	struct GridCommonGPUBuffer *grid_common_gpu_buffer;
+	/* The ccgdm is required for CD_ORIGINDEX lookup in vertex paint + multires */
+	struct CCGDerivedMesh *ccgdm;
 
 	/* Only used during BVH build and update,
 	 * don't need to remain valid after */
@@ -183,11 +185,21 @@ void pbvh_grow_nodes(PBVH *bvh, int totnode);
 bool ray_face_intersection_quad(
         const float ray_start[3], const float ray_normal[3],
         const float *t0, const float *t1, const float *t2, const float *t3,
-        float *r_dist);
+        float *depth);
 bool ray_face_intersection_tri(
         const float ray_start[3], const float ray_normal[3],
         const float *t0, const float *t1, const float *t2,
-        float *r_dist);
+        float *depth);
+
+bool ray_face_nearest_quad(
+        const float ray_start[3], const float ray_normal[3],
+        const float *t0, const float *t1, const float *t2, const float *t3,
+        float *r_depth, float *r_dist_sq);
+bool ray_face_nearest_tri(
+        const float ray_start[3], const float ray_normal[3],
+        const float *t0, const float *t1, const float *t2,
+        float *r_depth, float *r_dist_sq);
+
 void pbvh_update_BB_redraw(PBVH *bvh, PBVHNode **nodes, int totnode, int flag);
 
 /* pbvh_bmesh.c */
@@ -195,6 +207,10 @@ bool pbvh_bmesh_node_raycast(
         PBVHNode *node, const float ray_start[3],
         const float ray_normal[3], float *dist,
         bool use_original);
+bool pbvh_bmesh_node_nearest_to_ray(
+        PBVHNode *node, const float ray_start[3],
+        const float ray_normal[3], float *depth, float *dist_sq,
+        bool use_original);
 
 void pbvh_bmesh_normals_update(PBVHNode **nodes, int totnode);
 
diff --git a/source/blender/blenkernel/intern/pointcache.c b/source/blender/blenkernel/intern/pointcache.c
index 0b152534dcb..5ec3156f4df 100644
--- a/source/blender/blenkernel/intern/pointcache.c
+++ b/source/blender/blenkernel/intern/pointcache.c
@@ -3449,7 +3449,7 @@ void BKE_ptcache_free_list(ListBase *ptcaches)
 	}
 }
 
-static PointCache *ptcache_copy(PointCache *cache, bool copy_data)
+static PointCache *ptcache_copy(PointCache *cache, const bool copy_data)
 {
 	PointCache *ncache;
 
@@ -3492,14 +3492,15 @@ static PointCache *ptcache_copy(PointCache *cache, bool copy_data)
 }
 
 /* returns first point cache */
-PointCache *BKE_ptcache_copy_list(ListBase *ptcaches_new, const ListBase *ptcaches_old, bool copy_data)
+PointCache *BKE_ptcache_copy_list(ListBase *ptcaches_new, const ListBase *ptcaches_old, const int flag)
 {
 	PointCache *cache = ptcaches_old->first;
 
 	BLI_listbase_clear(ptcaches_new);
 
-	for (; cache; cache=cache->next)
-		BLI_addtail(ptcaches_new, ptcache_copy(cache, copy_data));
+	for (; cache; cache=cache->next) {
+		BLI_addtail(ptcaches_new, ptcache_copy(cache, (flag & LIB_ID_COPY_CACHES) != 0));
+	}
 
 	return ptcaches_new->first;
 }
@@ -3618,7 +3619,13 @@ void BKE_ptcache_bake(PTCacheBaker *baker)
 						psys_get_pointcache_start_end(scene, pid->calldata, &cache->startframe, &cache->endframe);
 					}
 
-					if (((cache->flag & PTCACHE_BAKED) == 0) && (render || bake)) {
+					// XXX workaround for regression inroduced in ee3fadd, needs looking into
+					if (pid->type == PTCACHE_TYPE_RIGIDBODY) {
+						if ((cache->flag & PTCACHE_REDO_NEEDED || (cache->flag & PTCACHE_SIMULATION_VALID)==0) && (render || bake)) {
+							BKE_ptcache_id_clear(pid, PTCACHE_CLEAR_ALL, 0);
+						}
+					}
+					else if (((cache->flag & PTCACHE_BAKED) == 0) && (render || bake)) {
 						BKE_ptcache_id_clear(pid, PTCACHE_CLEAR_ALL, 0);
 					}
 
diff --git a/source/blender/blenkernel/intern/rigidbody.c b/source/blender/blenkernel/intern/rigidbody.c
index 6056515af9a..f75b14579c7 100644
--- a/source/blender/blenkernel/intern/rigidbody.c
+++ b/source/blender/blenkernel/intern/rigidbody.c
@@ -183,7 +183,7 @@ void BKE_rigidbody_free_constraint(Object *ob)
  * be added to relevant groups later...
  */
 
-RigidBodyOb *BKE_rigidbody_copy_object(const Object *ob)
+RigidBodyOb *BKE_rigidbody_copy_object(const Object *ob, const int UNUSED(flag))
 {
 	RigidBodyOb *rboN = NULL;
 
@@ -203,7 +203,7 @@ RigidBodyOb *BKE_rigidbody_copy_object(const Object *ob)
 	return rboN;
 }
 
-RigidBodyCon *BKE_rigidbody_copy_constraint(const Object *ob)
+RigidBodyCon *BKE_rigidbody_copy_constraint(const Object *ob, const int UNUSED(flag))
 {
 	RigidBodyCon *rbcN = NULL;
 
@@ -290,8 +290,6 @@ static rbCollisionShape *rigidbody_get_shape_trimesh_from_mesh(Object *ob)
 		if (dm == NULL)
 			return NULL;
 
-		DM_ensure_looptri(dm);
-
 		mvert   = dm->getVertArray(dm);
 		totvert = dm->getNumVerts(dm);
 		looptri = dm->getLoopTriArray(dm);
@@ -523,8 +521,6 @@ void BKE_rigidbody_calc_volume(Object *ob, float *r_vol)
 				if (dm == NULL)
 					return;
 			
-				DM_ensure_looptri(dm);
-			
 				mvert   = dm->getVertArray(dm);
 				totvert = dm->getNumVerts(dm);
 				lt = dm->getLoopTriArray(dm);
@@ -608,8 +604,6 @@ void BKE_rigidbody_calc_center_of_mass(Object *ob, float r_center[3])
 				if (dm == NULL)
 					return;
 			
-				DM_ensure_looptri(dm);
-			
 				mvert   = dm->getVertArray(dm);
 				totvert = dm->getNumVerts(dm);
 				looptri = dm->getLoopTriArray(dm);
@@ -944,24 +938,26 @@ RigidBodyWorld *BKE_rigidbody_create_world(Scene *scene)
 	return rbw;
 }
 
-RigidBodyWorld *BKE_rigidbody_world_copy(RigidBodyWorld *rbw)
+RigidBodyWorld *BKE_rigidbody_world_copy(RigidBodyWorld *rbw, const int flag)
 {
-	RigidBodyWorld *rbwn = MEM_dupallocN(rbw);
+	RigidBodyWorld *rbw_copy = MEM_dupallocN(rbw);
 
-	if (rbw->effector_weights)
-		rbwn->effector_weights = MEM_dupallocN(rbw->effector_weights);
-	if (rbwn->group)
-		id_us_plus(&rbwn->group->id);
-	if (rbwn->constraints)
-		id_us_plus(&rbwn->constraints->id);
+	if (rbw->effector_weights) {
+		rbw_copy->effector_weights = MEM_dupallocN(rbw->effector_weights);
+	}
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		id_us_plus((ID *)rbw_copy->group);
+		id_us_plus((ID *)rbw_copy->constraints);
+	}
 
-	rbwn->pointcache = BKE_ptcache_copy_list(&rbwn->ptcaches, &rbw->ptcaches, false);
+	/* XXX Never copy caches here? */
+	rbw_copy->pointcache = BKE_ptcache_copy_list(&rbw_copy->ptcaches, &rbw->ptcaches, flag & ~LIB_ID_COPY_CACHES);
 
-	rbwn->objects = NULL;
-	rbwn->physics_world = NULL;
-	rbwn->numbodies = 0;
+	rbw_copy->objects = NULL;
+	rbw_copy->physics_world = NULL;
+	rbw_copy->numbodies = 0;
 
-	return rbwn;
+	return rbw_copy;
 }
 
 void BKE_rigidbody_world_groups_relink(RigidBodyWorld *rbw)
@@ -1226,7 +1222,7 @@ static void rigidbody_update_sim_world(Scene *scene, RigidBodyWorld *rbw)
 	rigidbody_update_ob_array(rbw);
 }
 
-static void rigidbody_update_sim_ob(Scene *scene, RigidBodyWorld *rbw, Object *ob, RigidBodyOb *rbo)
+static void rigidbody_update_sim_ob(const struct EvaluationContext *eval_ctx, Scene *scene, RigidBodyWorld *rbw, Object *ob, RigidBodyOb *rbo)
 {
 	float loc[3];
 	float rot[4];
@@ -1274,7 +1270,7 @@ static void rigidbody_update_sim_ob(Scene *scene, RigidBodyWorld *rbw, Object *o
 		ListBase *effectors;
 
 		/* get effectors present in the group specified by effector_weights */
-		effectors = pdInitEffectors(scene, ob, NULL, effector_weights, true);
+		effectors = pdInitEffectors(eval_ctx, scene, ob, NULL, effector_weights, true);
 		if (effectors) {
 			float eff_force[3] = {0.0f, 0.0f, 0.0f};
 			float eff_loc[3], eff_vel[3];
@@ -1315,7 +1311,7 @@ static void rigidbody_update_sim_ob(Scene *scene, RigidBodyWorld *rbw, Object *o
  *
  * \param rebuild Rebuild entire simulation
  */
-static void rigidbody_update_simulation(Scene *scene, RigidBodyWorld *rbw, bool rebuild)
+static void rigidbody_update_simulation(const struct EvaluationContext *eval_ctx, Scene *scene, RigidBodyWorld *rbw, bool rebuild)
 {
 	GroupObject *go;
 
@@ -1352,7 +1348,7 @@ static void rigidbody_update_simulation(Scene *scene, RigidBodyWorld *rbw, bool
 			/* validate that we've got valid object set up here... */
 			RigidBodyOb *rbo = ob->rigidbody_object;
 			/* update transformation matrix of the object so we don't get a frame of lag for simple animations */
-			BKE_object_where_is_calc(scene, ob);
+			BKE_object_where_is_calc(eval_ctx, scene, ob);
 
 			if (rbo == NULL) {
 				/* Since this object is included in the sim group but doesn't have
@@ -1386,7 +1382,7 @@ static void rigidbody_update_simulation(Scene *scene, RigidBodyWorld *rbw, bool
 			}
 
 			/* update simulation object... */
-			rigidbody_update_sim_ob(scene, rbw, ob, rbo);
+			rigidbody_update_sim_ob(eval_ctx, scene, rbw, ob, rbo);
 		}
 	}
 	
@@ -1400,7 +1396,7 @@ static void rigidbody_update_simulation(Scene *scene, RigidBodyWorld *rbw, bool
 			/* validate that we've got valid object set up here... */
 			RigidBodyCon *rbc = ob->rigidbody_constraint;
 			/* update transformation matrix of the object so we don't get a frame of lag for simple animations */
-			BKE_object_where_is_calc(scene, ob);
+			BKE_object_where_is_calc(eval_ctx, scene, ob);
 
 			if (rbc == NULL) {
 				/* Since this object is included in the group but doesn't have
@@ -1485,24 +1481,60 @@ void BKE_rigidbody_sync_transforms(RigidBodyWorld *rbw, Object *ob, float ctime)
 void BKE_rigidbody_aftertrans_update(Object *ob, float loc[3], float rot[3], float quat[4], float rotAxis[3], float rotAngle)
 {
 	RigidBodyOb *rbo = ob->rigidbody_object;
+	bool correct_delta = !(rbo->flag & RBO_FLAG_KINEMATIC || rbo->type == RBO_TYPE_PASSIVE);
 
 	/* return rigid body and object to their initial states */
 	copy_v3_v3(rbo->pos, ob->loc);
 	copy_v3_v3(ob->loc, loc);
 
+	if (correct_delta) {
+		add_v3_v3(rbo->pos, ob->dloc);
+	}
+
 	if (ob->rotmode > 0) {
-		eulO_to_quat(rbo->orn, ob->rot, ob->rotmode);
+		float qt[4];
+		eulO_to_quat(qt, ob->rot, ob->rotmode);
+
+		if (correct_delta) {
+			float dquat[4];
+			eulO_to_quat(dquat, ob->drot, ob->rotmode);
+
+			mul_qt_qtqt(rbo->orn, dquat, qt);
+		}
+		else {
+			copy_qt_qt(rbo->orn, qt);
+		}
+
 		copy_v3_v3(ob->rot, rot);
 	}
 	else if (ob->rotmode == ROT_MODE_AXISANGLE) {
-		axis_angle_to_quat(rbo->orn, ob->rotAxis, ob->rotAngle);
+		float qt[4];
+		axis_angle_to_quat(qt, ob->rotAxis, ob->rotAngle);
+
+		if (correct_delta) {
+			float dquat[4];
+			axis_angle_to_quat(dquat, ob->drotAxis, ob->drotAngle);
+
+			mul_qt_qtqt(rbo->orn, dquat, qt);
+		}
+		else {
+			copy_qt_qt(rbo->orn, qt);
+		}
+
 		copy_v3_v3(ob->rotAxis, rotAxis);
 		ob->rotAngle = rotAngle;
 	}
 	else {
-		copy_qt_qt(rbo->orn, ob->quat);
+		if (correct_delta) {
+			mul_qt_qtqt(rbo->orn, ob->dquat, ob->quat);
+		}
+		else {
+			copy_qt_qt(rbo->orn, ob->quat);
+		}
+
 		copy_qt_qt(ob->quat, quat);
 	}
+
 	if (rbo->physics_object) {
 		/* allow passive objects to return to original transform */
 		if (rbo->type == RBO_TYPE_PASSIVE)
@@ -1514,15 +1546,16 @@ void BKE_rigidbody_aftertrans_update(Object *ob, float loc[3], float rot[3], flo
 
 void BKE_rigidbody_cache_reset(RigidBodyWorld *rbw)
 {
-	if (rbw)
+	if (rbw) {
 		rbw->pointcache->flag |= PTCACHE_OUTDATED;
+	}
 }
 
 /* ------------------ */
 
 /* Rebuild rigid body world */
 /* NOTE: this needs to be called before frame update to work correctly */
-void BKE_rigidbody_rebuild_world(Scene *scene, float ctime)
+void BKE_rigidbody_rebuild_world(const struct EvaluationContext *eval_ctx, Scene *scene, float ctime)
 {
 	RigidBodyWorld *rbw = scene->rigidbody_world;
 	PointCache *cache;
@@ -1541,7 +1574,7 @@ void BKE_rigidbody_rebuild_world(Scene *scene, float ctime)
 	if (ctime == startframe + 1 && rbw->ltime == startframe) {
 		if (cache->flag & PTCACHE_OUTDATED) {
 			BKE_ptcache_id_reset(scene, &pid, PTCACHE_RESET_OUTDATED);
-			rigidbody_update_simulation(scene, rbw, true);
+			rigidbody_update_simulation(eval_ctx, scene, rbw, true);
 			BKE_ptcache_validate(cache, (int)ctime);
 			cache->last_exact = 0;
 			cache->flag &= ~PTCACHE_REDO_NEEDED;
@@ -1550,7 +1583,7 @@ void BKE_rigidbody_rebuild_world(Scene *scene, float ctime)
 }
 
 /* Run RigidBody simulation for the specified physics world */
-void BKE_rigidbody_do_simulation(Scene *scene, float ctime)
+void BKE_rigidbody_do_simulation(const struct EvaluationContext *eval_ctx, Scene *scene, float ctime)
 {
 	float timestep;
 	RigidBodyWorld *rbw = scene->rigidbody_world;
@@ -1581,7 +1614,7 @@ void BKE_rigidbody_do_simulation(Scene *scene, float ctime)
 	// RB_TODO deal with interpolated, old and baked results
 	bool can_simulate = (ctime == rbw->ltime + 1) && !(cache->flag & PTCACHE_BAKED);
 
-	if (BKE_ptcache_read(&pid, ctime, can_simulate)) {
+	if (BKE_ptcache_read(&pid, ctime, can_simulate) == PTCACHE_READ_EXACT) {
 		BKE_ptcache_validate(cache, (int)ctime);
 		rbw->ltime = ctime;
 		return;
@@ -1595,7 +1628,7 @@ void BKE_rigidbody_do_simulation(Scene *scene, float ctime)
 		}
 
 		/* update and validate simulation */
-		rigidbody_update_simulation(scene, rbw, false);
+		rigidbody_update_simulation(eval_ctx, scene, rbw, false);
 
 		/* calculate how much time elapsed since last step in seconds */
 		timestep = 1.0f / (float)FPS * (ctime - rbw->ltime) * rbw->time_scale;
@@ -1621,13 +1654,13 @@ void BKE_rigidbody_do_simulation(Scene *scene, float ctime)
 #  pragma GCC diagnostic ignored "-Wunused-parameter"
 #endif
 
-struct RigidBodyOb *BKE_rigidbody_copy_object(const Object *ob) { return NULL; }
-struct RigidBodyCon *BKE_rigidbody_copy_constraint(const Object *ob) { return NULL; }
+struct RigidBodyOb *BKE_rigidbody_copy_object(const Object *ob, const int flag) { return NULL; }
+struct RigidBodyCon *BKE_rigidbody_copy_constraint(const Object *ob, const int flag) { return NULL; }
 void BKE_rigidbody_validate_sim_world(Scene *scene, RigidBodyWorld *rbw, bool rebuild) {}
 void BKE_rigidbody_calc_volume(Object *ob, float *r_vol) { if (r_vol) *r_vol = 0.0f; }
 void BKE_rigidbody_calc_center_of_mass(Object *ob, float r_center[3]) { zero_v3(r_center); }
 struct RigidBodyWorld *BKE_rigidbody_create_world(Scene *scene) { return NULL; }
-struct RigidBodyWorld *BKE_rigidbody_world_copy(RigidBodyWorld *rbw) { return NULL; }
+struct RigidBodyWorld *BKE_rigidbody_world_copy(RigidBodyWorld *rbw, const int flag) { return NULL; }
 void BKE_rigidbody_world_groups_relink(struct RigidBodyWorld *rbw) {}
 void BKE_rigidbody_world_id_loop(struct RigidBodyWorld *rbw, RigidbodyWorldIDFunc func, void *userdata) {}
 struct RigidBodyOb *BKE_rigidbody_create_object(Scene *scene, Object *ob, short type) { return NULL; }
@@ -1639,8 +1672,8 @@ void BKE_rigidbody_sync_transforms(RigidBodyWorld *rbw, Object *ob, float ctime)
 void BKE_rigidbody_aftertrans_update(Object *ob, float loc[3], float rot[3], float quat[4], float rotAxis[3], float rotAngle) {}
 bool BKE_rigidbody_check_sim_running(RigidBodyWorld *rbw, float ctime) { return false; }
 void BKE_rigidbody_cache_reset(RigidBodyWorld *rbw) {}
-void BKE_rigidbody_rebuild_world(Scene *scene, float ctime) {}
-void BKE_rigidbody_do_simulation(Scene *scene, float ctime) {}
+void BKE_rigidbody_rebuild_world(const struct EvaluationContext *eval_ctx, Scene *scene, float ctime) {}
+void BKE_rigidbody_do_simulation(const struct EvaluationContext *eval_ctx, Scene *scene, float ctime) {}
 
 #ifdef __GNUC__
 #  pragma GCC diagnostic pop
@@ -1651,7 +1684,7 @@ void BKE_rigidbody_do_simulation(Scene *scene, float ctime) {}
 /* -------------------- */
 /* Depsgraph evaluation */
 
-void BKE_rigidbody_rebuild_sim(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_rigidbody_rebuild_sim(const struct EvaluationContext *eval_ctx,
                                Scene *scene)
 {
 	float ctime = BKE_scene_frame_get(scene);
@@ -1662,11 +1695,11 @@ void BKE_rigidbody_rebuild_sim(struct EvaluationContext *UNUSED(eval_ctx),
 
 	/* rebuild sim data (i.e. after resetting to start of timeline) */
 	if (BKE_scene_check_rigidbody_active(scene)) {
-		BKE_rigidbody_rebuild_world(scene, ctime);
+		BKE_rigidbody_rebuild_world(eval_ctx, scene, ctime);
 	}
 }
 
-void BKE_rigidbody_eval_simulation(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_rigidbody_eval_simulation(const struct EvaluationContext *eval_ctx,
                                    Scene *scene)
 {
 	float ctime = BKE_scene_frame_get(scene);
@@ -1677,11 +1710,11 @@ void BKE_rigidbody_eval_simulation(struct EvaluationContext *UNUSED(eval_ctx),
 
 	/* evaluate rigidbody sim */
 	if (BKE_scene_check_rigidbody_active(scene)) {
-		BKE_rigidbody_do_simulation(scene, ctime);
+		BKE_rigidbody_do_simulation(eval_ctx, scene, ctime);
 	}
 }
 
-void BKE_rigidbody_object_sync_transforms(struct EvaluationContext *UNUSED(eval_ctx),
+void BKE_rigidbody_object_sync_transforms(const struct EvaluationContext *UNUSED(eval_ctx),
                                           Scene *scene,
                                           Object *ob)
 {
diff --git a/source/blender/blenkernel/intern/sca.c b/source/blender/blenkernel/intern/sca.c
index 19d646daf9f..fb81ed4d47f 100644
--- a/source/blender/blenkernel/intern/sca.c
+++ b/source/blender/blenkernel/intern/sca.c
@@ -72,7 +72,7 @@ void free_sensors(ListBase *lb)
 	}
 }
 
-bSensor *copy_sensor(bSensor *sens)
+bSensor *copy_sensor(bSensor *sens, const int UNUSED(flag))
 {
 	bSensor *sensn;
 	
@@ -87,14 +87,14 @@ bSensor *copy_sensor(bSensor *sens)
 	return sensn;
 }
 
-void copy_sensors(ListBase *lbn, const ListBase *lbo)
+void copy_sensors(ListBase *lbn, const ListBase *lbo, const int flag)
 {
 	bSensor *sens, *sensn;
 	
 	lbn->first= lbn->last= NULL;
 	sens= lbo->first;
 	while (sens) {
-		sensn= copy_sensor(sens);
+		sensn= copy_sensor(sens, flag);
 		BLI_addtail(lbn, sensn);
 		sens= sens->next;
 	}
@@ -234,7 +234,7 @@ void free_controllers(ListBase *lb)
 	}
 }
 
-bController *copy_controller(bController *cont)
+bController *copy_controller(bController *cont, const int UNUSED(flag))
 {
 	bController *contn;
 	
@@ -251,14 +251,14 @@ bController *copy_controller(bController *cont)
 	return contn;
 }
 
-void copy_controllers(ListBase *lbn, const ListBase *lbo)
+void copy_controllers(ListBase *lbn, const ListBase *lbo, const int flag)
 {
 	bController *cont, *contn;
 	
 	lbn->first= lbn->last= NULL;
 	cont= lbo->first;
 	while (cont) {
-		contn= copy_controller(cont);
+		contn= copy_controller(cont, flag);
 		BLI_addtail(lbn, contn);
 		cont= cont->next;
 	}
@@ -359,7 +359,7 @@ void free_actuators(ListBase *lb)
 	}
 }
 
-bActuator *copy_actuator(bActuator *act)
+bActuator *copy_actuator(bActuator *act, const int flag)
 {
 	bActuator *actn;
 	
@@ -374,29 +374,31 @@ bActuator *copy_actuator(bActuator *act)
 		case ACT_SHAPEACTION:
 		{
 			bActionActuator *aa = (bActionActuator *)act->data;
-			if (aa->act)
+			if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
 				id_us_plus((ID *)aa->act);
+			}
 			break;
 		}
 		case ACT_SOUND:
 		{
 			bSoundActuator *sa = (bSoundActuator *)act->data;
-			if (sa->sound)
+			if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
 				id_us_plus((ID *)sa->sound);
+			}
 			break;
 		}
 	}
 	return actn;
 }
 
-void copy_actuators(ListBase *lbn, const ListBase *lbo)
+void copy_actuators(ListBase *lbn, const ListBase *lbo, const int flag)
 {
 	bActuator *act, *actn;
 	
 	lbn->first= lbn->last= NULL;
 	act= lbo->first;
 	while (act) {
-		actn= copy_actuator(act);
+		actn= copy_actuator(act, flag);
 		BLI_addtail(lbn, actn);
 		act= act->next;
 	}
@@ -783,11 +785,11 @@ void BKE_sca_logic_links_remap(Main *bmain, Object *ob_old, Object *ob_new)
  * Handle the copying of logic data into a new object, including internal logic links update.
  * External links (links between logic bricks of different objects) must be handled separately.
  */
-void BKE_sca_logic_copy(Object *ob_new, const Object *ob)
+void BKE_sca_logic_copy(Object *ob_new, const Object *ob, const int flag)
 {
-	copy_sensors(&ob_new->sensors, &ob->sensors);
-	copy_controllers(&ob_new->controllers, &ob->controllers);
-	copy_actuators(&ob_new->actuators, &ob->actuators);
+	copy_sensors(&ob_new->sensors, &ob->sensors, flag);
+	copy_controllers(&ob_new->controllers, &ob->controllers, flag);
+	copy_actuators(&ob_new->actuators, &ob->actuators, flag);
 
 	for (bSensor *sens = ob_new->sensors.first; sens; sens = sens->next) {
 		if (sens->flag & SENS_NEW) {
diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index f54a02f033a..d36f128cef1 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -131,17 +131,6 @@ void free_avicodecdata(AviCodecData *acd)
 	}
 }
 
-void free_qtcodecdata(QuicktimeCodecData *qcd)
-{
-	if (qcd) {
-		if (qcd->cdParms) {
-			MEM_freeN(qcd->cdParms);
-			qcd->cdParms = NULL;
-			qcd->cdSize = 0;
-		}
-	}
-}
-
 static void remove_sequencer_fcurves(Scene *sce)
 {
 	AnimData *adt = BKE_animdata_from_id(&sce->id);
@@ -161,314 +150,415 @@ static void remove_sequencer_fcurves(Scene *sce)
 }
 
 /* copy SceneCollection tree but keep pointing to the same objects */
-static void scene_collection_copy(SceneCollection *scn, SceneCollection *sc)
+static void scene_collection_copy(SceneCollection *sc_dst, SceneCollection *sc_src, const int flag)
 {
-	BLI_duplicatelist(&scn->objects, &sc->objects);
-	for (LinkData *link = scn->objects.first; link; link = link->next) {
-		id_us_plus(link->data);
+	BLI_duplicatelist(&sc_dst->objects, &sc_src->objects);
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		for (LinkData *link = sc_dst->objects.first; link; link = link->next) {
+			id_us_plus(link->data);
+		}
 	}
 
-	BLI_duplicatelist(&scn->filter_objects, &sc->filter_objects);
-	for (LinkData *link = scn->filter_objects.first; link; link = link->next) {
-		id_us_plus(link->data);
+	BLI_duplicatelist(&sc_dst->filter_objects, &sc_src->filter_objects);
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		for (LinkData *link = sc_dst->filter_objects.first; link; link = link->next) {
+			id_us_plus(link->data);
+		}
 	}
 
-	BLI_duplicatelist(&scn->scene_collections, &sc->scene_collections);
-	SceneCollection *nscn = scn->scene_collections.first; /* nested SceneCollection new */
-	for (SceneCollection *nsc = sc->scene_collections.first; nsc; nsc = nsc->next) {
-		scene_collection_copy(nscn, nsc);
-		nscn = nscn->next;
+	BLI_duplicatelist(&sc_dst->scene_collections, &sc_src->scene_collections);
+	for (SceneCollection *nsc_src = sc_src->scene_collections.first, *nsc_dst = sc_dst->scene_collections.first;
+	     nsc_src;
+	     nsc_src = nsc_src->next, nsc_dst = nsc_dst->next)
+	{
+		scene_collection_copy(nsc_dst, nsc_src, flag);
 	}
 }
 
 /* Find the equivalent SceneCollection in the new tree */
-static SceneCollection *scene_collection_from_new_tree(SceneCollection *sc_reference, SceneCollection *scn, SceneCollection *sc)
+static SceneCollection *scene_collection_from_new_tree(SceneCollection *sc_reference, SceneCollection *sc_dst, SceneCollection *sc_src)
 {
-	if (sc == sc_reference) {
-		return scn;
+	if (sc_src == sc_reference) {
+		return sc_dst;
 	}
 
-	SceneCollection *nscn = scn->scene_collections.first; /* nested master collection new */
-	for (SceneCollection *nsc = sc->scene_collections.first; nsc; nsc = nsc->next) {
-
-		SceneCollection *found = scene_collection_from_new_tree(sc_reference, nscn, nsc);
-		if (found) {
+	for (SceneCollection *nsc_src = sc_src->scene_collections.first, *nsc_dst = sc_dst->scene_collections.first;
+	     nsc_src;
+	     nsc_src = nsc_src->next, nsc_dst = nsc_dst->next)
+	{
+		SceneCollection *found = scene_collection_from_new_tree(sc_reference, nsc_dst, nsc_src);
+		if (found != NULL) {
 			return found;
 		}
-		nscn = nscn->next;
 	}
 	return NULL;
 }
 
-/* recreate the LayerCollection tree */
-static void layer_collections_recreate(SceneLayer *sl, ListBase *lb, SceneCollection *mcn, SceneCollection *mc)
+static void layer_collections_sync_flags(ListBase *layer_collections_dst, const ListBase *layer_collections_src)
 {
-	for (LayerCollection *lc = lb->first; lc; lc = lc->next) {
+	LayerCollection *layer_collection_dst = (LayerCollection *)layer_collections_dst->first;
+	const LayerCollection *layer_collection_src = (const LayerCollection *)layer_collections_src->first;
+	while (layer_collection_dst != NULL) {
+		layer_collection_dst->flag = layer_collection_src->flag;
+		layer_collections_sync_flags(&layer_collection_dst->layer_collections,
+		                             &layer_collection_src->layer_collections);
+		/* TODO(sergey/dfelinto): Overrides. */
+		layer_collection_dst = layer_collection_dst->next;
+		layer_collection_src = layer_collection_src->next;
+	}
+}
 
-		SceneCollection *sc = scene_collection_from_new_tree(lc->scene_collection, mcn, mc);
-		BLI_assert(sc);
 
-		/* instead of syncronizing both trees we simply re-create it */
-		BKE_collection_link(sl, sc);
+/* recreate the LayerCollection tree */
+static void layer_collections_recreate(
+        SceneLayer *sl_dst, ListBase *lb_src, SceneCollection *mc_dst, SceneCollection *mc_src)
+{
+	for (LayerCollection *lc_src = lb_src->first; lc_src; lc_src = lc_src->next) {
+		SceneCollection *sc_dst = scene_collection_from_new_tree(lc_src->scene_collection, mc_dst, mc_src);
+		BLI_assert(sc_dst);
+
+		/* instead of synchronizing both trees we simply re-create it */
+		BKE_collection_link(sl_dst, sc_dst);
 	}
 }
 
-Scene *BKE_scene_copy(Main *bmain, Scene *sce, int type)
+/**
+ * Only copy internal data of Scene ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_scene_copy_data(Main *bmain, Scene *sce_dst, const Scene *sce_src, const int flag)
 {
-	Scene *scen;
-	SceneRenderLayer *srl, *new_srl;
-	FreestyleLineSet *lineset;
-	ToolSettings *ts;
-	BaseLegacy *legacy_base, *olegacy_base;
-	
-	if (type == SCE_COPY_EMPTY) {
-		ListBase rl, rv;
-		scen = BKE_scene_add(bmain, sce->id.name + 2);
-		
-		rl = scen->r.layers;
-		rv = scen->r.views;
-		curvemapping_free_data(&scen->r.mblur_shutter_curve);
-		scen->r = sce->r;
-		scen->r.layers = rl;
-		scen->r.actlay = 0;
-		scen->r.views = rv;
-		scen->unit = sce->unit;
-		scen->physics_settings = sce->physics_settings;
-		scen->gm = sce->gm;
-		scen->audio = sce->audio;
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
 
-		if (sce->id.properties)
-			scen->id.properties = IDP_CopyProperty(sce->id.properties);
+	sce_dst->ed = NULL;
+	sce_dst->theDag = NULL;
+	sce_dst->depsgraph_legacy = NULL;
+	sce_dst->obedit = NULL;
+	sce_dst->fps_info = NULL;
 
-		MEM_freeN(scen->toolsettings);
-		BKE_sound_destroy_scene(scen);
+	BLI_duplicatelist(&(sce_dst->base), &(sce_src->base));
+	for (BaseLegacy *base_dst = sce_dst->base.first, *base_src = sce_src->base.first;
+	     base_dst;
+	     base_dst = base_dst->next, base_src = base_src->next)
+	{
+		if (base_src == sce_src->basact) {
+			sce_dst->basact = base_dst;
+		}
 	}
-	else {
-		scen = BKE_libblock_copy(bmain, &sce->id);
-		BLI_duplicatelist(&(scen->base), &(sce->base));
-		
-		id_us_plus((ID *)scen->world);
-		id_us_plus((ID *)scen->set);
-		/* id_us_plus((ID *)scen->gm.dome.warptext); */  /* XXX Not refcounted? see readfile.c */
 
-		scen->ed = NULL;
-		scen->theDag = NULL;
-		scen->depsgraph = NULL;
-		scen->obedit = NULL;
-		scen->fps_info = NULL;
+	/* layers and collections */
+	sce_dst->collection = MEM_dupallocN(sce_src->collection);
+	SceneCollection *mc_src = BKE_collection_master(sce_src);
+	SceneCollection *mc_dst = BKE_collection_master(sce_dst);
 
-		if (sce->rigidbody_world)
-			scen->rigidbody_world = BKE_rigidbody_world_copy(sce->rigidbody_world);
+	/* recursively creates a new SceneCollection tree */
+	scene_collection_copy(mc_dst, mc_src, flag_subdata);
 
-		BLI_duplicatelist(&(scen->markers), &(sce->markers));
-		BLI_duplicatelist(&(scen->r.layers), &(sce->r.layers));
-		BLI_duplicatelist(&(scen->r.views), &(sce->r.views));
-		BKE_keyingsets_copy(&(scen->keyingsets), &(sce->keyingsets));
-
-		if (sce->nodetree) {
-			/* ID's are managed on both copy and switch */
-			scen->nodetree = ntreeCopyTree(bmain, sce->nodetree);
-			BKE_libblock_relink_ex(bmain, scen->nodetree, &sce->id, &scen->id, false);
-		}
+	IDPropertyTemplate val = {0};
+	BLI_duplicatelist(&sce_dst->render_layers, &sce_src->render_layers);
+	for (SceneLayer *sl_src = sce_src->render_layers.first, *sl_dst = sce_dst->render_layers.first;
+	     sl_src;
+	     sl_src = sl_src->next, sl_dst = sl_dst->next)
+	{
+		sl_dst->stats = NULL;
+		sl_dst->properties_evaluated = NULL;
+		sl_dst->properties = IDP_New(IDP_GROUP, &val, ROOT_PROP);
+		IDP_MergeGroup_ex(sl_dst->properties, sl_src->properties, true, flag_subdata);
+
+		/* we start fresh with no overrides and no visibility flags set
+		 * instead of syncing both trees we simply unlink and relink the scene collection */
+		BLI_listbase_clear(&sl_dst->layer_collections);
+		BLI_listbase_clear(&sl_dst->object_bases);
+		BLI_listbase_clear(&sl_dst->drawdata);
+
+		layer_collections_recreate(sl_dst, &sl_src->layer_collections, mc_dst, mc_src);
+
+		/* Now we handle the syncing for visibility, selectability, ... */
+		layer_collections_sync_flags(&sl_dst->layer_collections, &sl_src->layer_collections);
+
+		Object *active_ob = OBACT_NEW(sl_src);
+		for (Base *base_src = sl_src->object_bases.first, *base_dst = sl_dst->object_bases.first;
+		     base_src;
+		     base_src = base_src->next, base_dst = base_dst->next)
+		{
+			base_dst->flag = base_src->flag;
+			base_dst->flag_legacy = base_src->flag_legacy;
 
-		olegacy_base = sce->base.first;
-		legacy_base = scen->base.first;
-		while (legacy_base) {
-			id_us_plus(&legacy_base->object->id);
-			if (olegacy_base == sce->basact) scen->basact = legacy_base;
-	
-			olegacy_base = olegacy_base->next;
-			legacy_base = legacy_base->next;
+			if (base_dst->object == active_ob) {
+				sl_dst->basact = base_dst;
+			}
 		}
+	}
 
-		/* copy action and remove animation used by sequencer */
-		BKE_animdata_copy_id_action(&scen->id, false);
+	sce_dst->collection_properties = IDP_New(IDP_GROUP, &val, ROOT_PROP);
+	if (sce_src->collection_properties) {
+		IDP_MergeGroup_ex(sce_dst->collection_properties, sce_src->collection_properties, true, flag_subdata);
+	}
+	sce_dst->layer_properties = IDP_New(IDP_GROUP, &val, ROOT_PROP);
+	if (sce_src->layer_properties) {
+		IDP_MergeGroup_ex(sce_dst->layer_properties, sce_src->layer_properties, true, flag_subdata);
+	}
 
-		if (type != SCE_COPY_FULL)
-			remove_sequencer_fcurves(scen);
+	BLI_duplicatelist(&(sce_dst->markers), &(sce_src->markers));
+	BLI_duplicatelist(&(sce_dst->r.layers), &(sce_src->r.layers));
+	BLI_duplicatelist(&(sce_dst->r.views), &(sce_src->r.views));
+	BKE_keyingsets_copy(&(sce_dst->keyingsets), &(sce_src->keyingsets));
 
-		/* copy Freestyle settings */
-		new_srl = scen->r.layers.first;
-		for (srl = sce->r.layers.first; srl; srl = srl->next) {
-			if (new_srl->prop != NULL) {
-				new_srl->prop = IDP_CopyProperty(new_srl->prop);
-			}
-			BKE_freestyle_config_copy(&new_srl->freestyleConfig, &srl->freestyleConfig);
-			if (type == SCE_COPY_FULL) {
-				for (lineset = new_srl->freestyleConfig.linesets.first; lineset; lineset = lineset->next) {
-					if (lineset->linestyle) {
-						id_us_plus((ID *)lineset->linestyle);
-						lineset->linestyle = BKE_linestyle_copy(bmain, lineset->linestyle);
-					}
-				}
-			}
-			new_srl = new_srl->next;
-		}
+	if (sce_src->nodetree) {
+		BKE_id_copy_ex(bmain, (ID *)sce_src->nodetree, (ID **)&sce_dst->nodetree, flag, false);
+		BKE_libblock_relink_ex(bmain, sce_dst->nodetree, (void *)(&sce_src->id), &sce_dst->id, false);
+	}
 
-		/* layers and collections */
-		scen->collection = MEM_dupallocN(sce->collection);
-		SceneCollection *mcn = BKE_collection_master(scen);
-		SceneCollection *mc = BKE_collection_master(sce);
-
-		/* recursively creates a new SceneCollection tree */
-		scene_collection_copy(mcn, mc);
-
-		IDPropertyTemplate val = {0};
-		BLI_duplicatelist(&scen->render_layers, &sce->render_layers);
-		SceneLayer *new_sl = scen->render_layers.first;
-		for (SceneLayer *sl = sce->render_layers.first; sl; sl = sl->next) {
-			new_sl->stats = NULL;
-			new_sl->properties_evaluated = NULL;
-			new_sl->properties = IDP_New(IDP_GROUP, &val, ROOT_PROP);
-			IDP_MergeGroup(new_sl->properties, sl->properties, true);
-
-			/* we start fresh with no overrides and no visibility flags set
-			 * instead of syncing both trees we simply unlink and relink the scene collection */
-			BLI_listbase_clear(&new_sl->layer_collections);
-			BLI_listbase_clear(&new_sl->object_bases);
-			BLI_listbase_clear(&new_sl->drawdata);
-			layer_collections_recreate(new_sl, &sl->layer_collections, mcn, mc);
-
-			Object *active_ob = OBACT_NEW;
-			Base *new_base = new_sl->object_bases.first;
-			for (Base *base = sl->object_bases.first; base; base = base->next) {
-				new_base->flag = base->flag;
-				new_base->flag_legacy = base->flag_legacy;
-
-				if (new_base->object == active_ob) {
-					new_sl->basact = new_base;
-				}
+	if (sce_src->rigidbody_world) {
+		sce_dst->rigidbody_world = BKE_rigidbody_world_copy(sce_src->rigidbody_world, flag_subdata);
+	}
 
-				new_base = new_base->next;
-			}
-			new_sl = new_sl->next;
+	/* copy Freestyle settings */
+	for (SceneRenderLayer *srl_dst = sce_dst->r.layers.first, *srl_src = sce_src->r.layers.first;
+	     srl_src;
+	     srl_dst = srl_dst->next, srl_src = srl_src->next)
+	{
+		if (srl_dst->prop != NULL) {
+			srl_dst->prop = IDP_CopyProperty_ex(srl_dst->prop, flag_subdata);
 		}
-
-		scen->collection_properties = IDP_New(IDP_GROUP, &val, ROOT_PROP);
-		scen->layer_properties = IDP_New(IDP_GROUP, &val, ROOT_PROP);
+		BKE_freestyle_config_copy(&srl_dst->freestyleConfig, &srl_src->freestyleConfig, flag_subdata);
 	}
 
 	/* copy color management settings */
-	BKE_color_managed_display_settings_copy(&scen->display_settings, &sce->display_settings);
-	BKE_color_managed_view_settings_copy(&scen->view_settings, &sce->view_settings);
-	BKE_color_managed_colorspace_settings_copy(&scen->sequencer_colorspace_settings, &sce->sequencer_colorspace_settings);
+	BKE_color_managed_display_settings_copy(&sce_dst->display_settings, &sce_src->display_settings);
+	BKE_color_managed_view_settings_copy(&sce_dst->view_settings, &sce_src->view_settings);
+	BKE_color_managed_colorspace_settings_copy(&sce_dst->sequencer_colorspace_settings, &sce_src->sequencer_colorspace_settings);
 
-	BKE_color_managed_display_settings_copy(&scen->r.im_format.display_settings, &sce->r.im_format.display_settings);
-	BKE_color_managed_view_settings_copy(&scen->r.im_format.view_settings, &sce->r.im_format.view_settings);
+	BKE_color_managed_display_settings_copy(&sce_dst->r.im_format.display_settings, &sce_src->r.im_format.display_settings);
+	BKE_color_managed_view_settings_copy(&sce_dst->r.im_format.view_settings, &sce_src->r.im_format.view_settings);
 
-	BKE_color_managed_display_settings_copy(&scen->r.bake.im_format.display_settings, &sce->r.bake.im_format.display_settings);
-	BKE_color_managed_view_settings_copy(&scen->r.bake.im_format.view_settings, &sce->r.bake.im_format.view_settings);
+	BKE_color_managed_display_settings_copy(&sce_dst->r.bake.im_format.display_settings, &sce_src->r.bake.im_format.display_settings);
+	BKE_color_managed_view_settings_copy(&sce_dst->r.bake.im_format.view_settings, &sce_src->r.bake.im_format.view_settings);
 
-	curvemapping_copy_data(&scen->r.mblur_shutter_curve, &sce->r.mblur_shutter_curve);
+	curvemapping_copy_data(&sce_dst->r.mblur_shutter_curve, &sce_src->r.mblur_shutter_curve);
 
 	/* tool settings */
-	scen->toolsettings = MEM_dupallocN(sce->toolsettings);
-
-	ts = scen->toolsettings;
-	if (ts) {
+	if (sce_dst->toolsettings != NULL) {
+		ToolSettings *ts = sce_dst->toolsettings = MEM_dupallocN(sce_dst->toolsettings);
 		if (ts->vpaint) {
 			ts->vpaint = MEM_dupallocN(ts->vpaint);
-			ts->vpaint->paintcursor = NULL;
-			ts->vpaint->vpaint_prev = NULL;
-			ts->vpaint->wpaint_prev = NULL;
-			BKE_paint_copy(&ts->vpaint->paint, &ts->vpaint->paint);
+			BKE_paint_copy(&ts->vpaint->paint, &ts->vpaint->paint, flag_subdata);
 		}
 		if (ts->wpaint) {
 			ts->wpaint = MEM_dupallocN(ts->wpaint);
-			ts->wpaint->paintcursor = NULL;
-			ts->wpaint->vpaint_prev = NULL;
-			ts->wpaint->wpaint_prev = NULL;
-			BKE_paint_copy(&ts->wpaint->paint, &ts->wpaint->paint);
+			BKE_paint_copy(&ts->wpaint->paint, &ts->wpaint->paint, flag_subdata);
 		}
 		if (ts->sculpt) {
 			ts->sculpt = MEM_dupallocN(ts->sculpt);
-			BKE_paint_copy(&ts->sculpt->paint, &ts->sculpt->paint);
+			BKE_paint_copy(&ts->sculpt->paint, &ts->sculpt->paint, flag_subdata);
+		}
+		if (ts->uvsculpt) {
+			ts->uvsculpt = MEM_dupallocN(ts->uvsculpt);
+			BKE_paint_copy(&ts->uvsculpt->paint, &ts->uvsculpt->paint, flag_subdata);
 		}
 
-		BKE_paint_copy(&ts->imapaint.paint, &ts->imapaint.paint);
+		BKE_paint_copy(&ts->imapaint.paint, &ts->imapaint.paint, flag_subdata);
 		ts->imapaint.paintcursor = NULL;
-		id_us_plus((ID *)ts->imapaint.stencil);
 		ts->particle.paintcursor = NULL;
-		
+		ts->particle.scene = NULL;
+		ts->particle.object = NULL;
+
 		/* duplicate Grease Pencil Drawing Brushes */
 		BLI_listbase_clear(&ts->gp_brushes);
-		for (bGPDbrush *brush = sce->toolsettings->gp_brushes.first; brush; brush = brush->next) {
+		for (bGPDbrush *brush = sce_src->toolsettings->gp_brushes.first; brush; brush = brush->next) {
 			bGPDbrush *newbrush = BKE_gpencil_brush_duplicate(brush);
 			BLI_addtail(&ts->gp_brushes, newbrush);
 		}
-		
+
 		/* duplicate Grease Pencil interpolation curve */
 		ts->gp_interpolate.custom_ipo = curvemapping_copy(ts->gp_interpolate.custom_ipo);
 	}
-	
+
 	/* make a private copy of the avicodecdata */
-	if (sce->r.avicodecdata) {
-		scen->r.avicodecdata = MEM_dupallocN(sce->r.avicodecdata);
-		scen->r.avicodecdata->lpFormat = MEM_dupallocN(scen->r.avicodecdata->lpFormat);
-		scen->r.avicodecdata->lpParms = MEM_dupallocN(scen->r.avicodecdata->lpParms);
-	}
-	
-	/* make a private copy of the qtcodecdata */
-	if (sce->r.qtcodecdata) {
-		scen->r.qtcodecdata = MEM_dupallocN(sce->r.qtcodecdata);
-		scen->r.qtcodecdata->cdParms = MEM_dupallocN(scen->r.qtcodecdata->cdParms);
+	if (sce_src->r.avicodecdata) {
+		sce_dst->r.avicodecdata = MEM_dupallocN(sce_src->r.avicodecdata);
+		sce_dst->r.avicodecdata->lpFormat = MEM_dupallocN(sce_dst->r.avicodecdata->lpFormat);
+		sce_dst->r.avicodecdata->lpParms = MEM_dupallocN(sce_dst->r.avicodecdata->lpParms);
 	}
-	
-	if (sce->r.ffcodecdata.properties) { /* intentionally check scen not sce. */
-		scen->r.ffcodecdata.properties = IDP_CopyProperty(sce->r.ffcodecdata.properties);
+
+	if (sce_src->r.ffcodecdata.properties) { /* intentionally check sce_dst not sce_src. */  /* XXX ??? comment outdated... */
+		sce_dst->r.ffcodecdata.properties = IDP_CopyProperty_ex(sce_src->r.ffcodecdata.properties, flag_subdata);
 	}
 
-	/* NOTE: part of SCE_COPY_LINK_DATA and SCE_COPY_FULL operations
-	 * are done outside of blenkernel with ED_objects_single_users! */
+	/* before scene copy */
+	BKE_sound_create_scene(sce_dst);
+
+	/* Copy sequencer, this is local data! */
+	if (sce_src->ed) {
+		sce_dst->ed = MEM_callocN(sizeof(*sce_dst->ed), __func__);
+		sce_dst->ed->seqbasep = &sce_dst->ed->seqbase;
+		BKE_sequence_base_dupli_recursive(
+		            sce_src, sce_dst, &sce_dst->ed->seqbase, &sce_src->ed->seqbase, SEQ_DUPE_ALL, flag_subdata);
+	}
 
-	/*  camera */
-	if (type == SCE_COPY_LINK_DATA || type == SCE_COPY_FULL) {
-		ID_NEW_REMAP(scen->camera);
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
+		BKE_previewimg_id_copy(&sce_dst->id, &sce_src->id);
 	}
-	
-	/* before scene copy */
-	BKE_sound_create_scene(scen);
-
-	/* world */
-	if (type == SCE_COPY_FULL) {
-		if (scen->world) {
-			id_us_plus((ID *)scen->world);
-			scen->world = BKE_world_copy(bmain, scen->world);
-			BKE_animdata_copy_id_action((ID *)scen->world, false);
+	else {
+		sce_dst->preview = NULL;
+	}
+}
+
+Scene *BKE_scene_copy(Main *bmain, Scene *sce, int type)
+{
+	Scene *sce_copy;
+
+	/* TODO this should/could most likely be replaced by call to more generic code at some point...
+	 * But for now, let's keep it well isolated here. */
+	if (type == SCE_COPY_EMPTY) {
+		ToolSettings *ts;
+		ListBase rl, rv;
+
+		sce_copy = BKE_scene_add(bmain, sce->id.name + 2);
+		
+		rl = sce_copy->r.layers;
+		rv = sce_copy->r.views;
+		curvemapping_free_data(&sce_copy->r.mblur_shutter_curve);
+		sce_copy->r = sce->r;
+		sce_copy->r.layers = rl;
+		sce_copy->r.actlay = 0;
+		sce_copy->r.views = rv;
+		sce_copy->unit = sce->unit;
+		sce_copy->physics_settings = sce->physics_settings;
+		sce_copy->gm = sce->gm;
+		sce_copy->audio = sce->audio;
+
+		if (sce->id.properties)
+			sce_copy->id.properties = IDP_CopyProperty(sce->id.properties);
+
+		MEM_freeN(sce_copy->toolsettings);
+		BKE_sound_destroy_scene(sce_copy);
+
+		/* copy color management settings */
+		BKE_color_managed_display_settings_copy(&sce_copy->display_settings, &sce->display_settings);
+		BKE_color_managed_view_settings_copy(&sce_copy->view_settings, &sce->view_settings);
+		BKE_color_managed_colorspace_settings_copy(&sce_copy->sequencer_colorspace_settings, &sce->sequencer_colorspace_settings);
+
+		BKE_color_managed_display_settings_copy(&sce_copy->r.im_format.display_settings, &sce->r.im_format.display_settings);
+		BKE_color_managed_view_settings_copy(&sce_copy->r.im_format.view_settings, &sce->r.im_format.view_settings);
+
+		BKE_color_managed_display_settings_copy(&sce_copy->r.bake.im_format.display_settings, &sce->r.bake.im_format.display_settings);
+		BKE_color_managed_view_settings_copy(&sce_copy->r.bake.im_format.view_settings, &sce->r.bake.im_format.view_settings);
+
+		curvemapping_copy_data(&sce_copy->r.mblur_shutter_curve, &sce->r.mblur_shutter_curve);
+
+		/* tool settings */
+		sce_copy->toolsettings = MEM_dupallocN(sce->toolsettings);
+
+		ts = sce_copy->toolsettings;
+		if (ts) {
+			if (ts->vpaint) {
+				ts->vpaint = MEM_dupallocN(ts->vpaint);
+				BKE_paint_copy(&ts->vpaint->paint, &ts->vpaint->paint, 0);
+			}
+			if (ts->wpaint) {
+				ts->wpaint = MEM_dupallocN(ts->wpaint);
+				BKE_paint_copy(&ts->wpaint->paint, &ts->wpaint->paint, 0);
+			}
+			if (ts->sculpt) {
+				ts->sculpt = MEM_dupallocN(ts->sculpt);
+				BKE_paint_copy(&ts->sculpt->paint, &ts->sculpt->paint, 0);
+			}
+			if (ts->uvsculpt) {
+				ts->uvsculpt = MEM_dupallocN(ts->uvsculpt);
+				BKE_paint_copy(&ts->uvsculpt->paint, &ts->uvsculpt->paint, 0);
+			}
+
+			BKE_paint_copy(&ts->imapaint.paint, &ts->imapaint.paint, 0);
+			ts->imapaint.paintcursor = NULL;
+			id_us_plus((ID *)ts->imapaint.stencil);
+			id_us_plus((ID *)ts->imapaint.clone);
+			id_us_plus((ID *)ts->imapaint.canvas);
+			ts->particle.paintcursor = NULL;
+			ts->particle.scene = NULL;
+			ts->particle.object = NULL;
+
+			/* duplicate Grease Pencil Drawing Brushes */
+			BLI_listbase_clear(&ts->gp_brushes);
+			for (bGPDbrush *brush = sce->toolsettings->gp_brushes.first; brush; brush = brush->next) {
+				bGPDbrush *newbrush = BKE_gpencil_brush_duplicate(brush);
+				BLI_addtail(&ts->gp_brushes, newbrush);
+			}
+
+			/* duplicate Grease Pencil interpolation curve */
+			ts->gp_interpolate.custom_ipo = curvemapping_copy(ts->gp_interpolate.custom_ipo);
+		}
+
+		/* make a private copy of the avicodecdata */
+		if (sce->r.avicodecdata) {
+			sce_copy->r.avicodecdata = MEM_dupallocN(sce->r.avicodecdata);
+			sce_copy->r.avicodecdata->lpFormat = MEM_dupallocN(sce_copy->r.avicodecdata->lpFormat);
+			sce_copy->r.avicodecdata->lpParms = MEM_dupallocN(sce_copy->r.avicodecdata->lpParms);
 		}
 
-		if (sce->ed) {
-			scen->ed = MEM_callocN(sizeof(Editing), "addseq");
-			scen->ed->seqbasep = &scen->ed->seqbase;
-			BKE_sequence_base_dupli_recursive(sce, scen, &scen->ed->seqbase, &sce->ed->seqbase, SEQ_DUPE_ALL);
+		if (sce->r.ffcodecdata.properties) { /* intentionally check scen not sce. */
+			sce_copy->r.ffcodecdata.properties = IDP_CopyProperty(sce->r.ffcodecdata.properties);
 		}
+
+		/* before scene copy */
+		BKE_sound_create_scene(sce_copy);
+
+		/* grease pencil */
+		sce_copy->gpd = NULL;
+
+		sce_copy->preview = NULL;
+
+		return sce_copy;
 	}
-	
-	/* grease pencil */
-	if (scen->gpd) {
+	else {
+		BKE_id_copy_ex(bmain, (ID *)sce, (ID **)&sce_copy, LIB_ID_COPY_ACTIONS, false);
+
+		/* Extra actions, most notably SCE_FULL_COPY also duplicates several 'children' datablocks... */
+
 		if (type == SCE_COPY_FULL) {
-			scen->gpd = BKE_gpencil_data_duplicate(bmain, scen->gpd, false);
-		}
-		else if (type == SCE_COPY_EMPTY) {
-			scen->gpd = NULL;
+			/* Copy Freestyle LineStyle datablocks. */
+			for (SceneRenderLayer *srl_dst = sce_copy->r.layers.first; srl_dst; srl_dst = srl_dst->next) {
+				for (FreestyleLineSet *lineset = srl_dst->freestyleConfig.linesets.first; lineset; lineset = lineset->next) {
+					if (lineset->linestyle) {
+						/* XXX Not copying anim/actions here? */
+						BKE_id_copy_ex(bmain, (ID *)lineset->linestyle, (ID **)&lineset->linestyle, 0, false);
+					}
+				}
+			}
+
+			/* Full copy of world (included animations) */
+			if (sce_copy->world) {
+				BKE_id_copy_ex(bmain, (ID *)sce_copy->world, (ID **)&sce_copy->world, LIB_ID_COPY_ACTIONS, false);
+			}
+
+			/* Full copy of GreasePencil. */
+			/* XXX Not copying anim/actions here? */
+			if (sce_copy->gpd) {
+				BKE_id_copy_ex(bmain, (ID *)sce_copy->gpd, (ID **)&sce_copy->gpd, 0, false);
+			}
 		}
 		else {
-			id_us_plus((ID *)scen->gpd);
+			/* Remove sequencer if not full copy */
+			/* XXX Why in Hell? :/ */
+			remove_sequencer_fcurves(sce_copy);
+			BKE_sequencer_editing_free(sce_copy);
 		}
-	}
 
-	BKE_previewimg_id_copy(&scen->id, &sce->id);
+		/* NOTE: part of SCE_COPY_LINK_DATA and SCE_COPY_FULL operations
+		 * are done outside of blenkernel with ED_objects_single_users! */
 
-	if (type != SCE_COPY_NEW) {
-		if (sce->collection_properties) {
-			IDP_MergeGroup(scen->collection_properties, sce->collection_properties, true);
+		/*  camera */
+		if (ELEM(type, SCE_COPY_LINK_DATA, SCE_COPY_FULL)) {
+			ID_NEW_REMAP(sce_copy->camera);
 		}
-		if (sce->layer_properties) {
-			IDP_MergeGroup(scen->layer_properties, sce->layer_properties, true);
-		}
-	}
 
-	return scen;
+		return sce_copy;
+	}
 }
 
 void BKE_scene_groups_relink(Scene *sce)
@@ -517,11 +607,6 @@ void BKE_scene_free_ex(Scene *sce, const bool do_id_user)
 		MEM_freeN(sce->r.avicodecdata);
 		sce->r.avicodecdata = NULL;
 	}
-	if (sce->r.qtcodecdata) {
-		free_qtcodecdata(sce->r.qtcodecdata);
-		MEM_freeN(sce->r.qtcodecdata);
-		sce->r.qtcodecdata = NULL;
-	}
 	if (sce->r.ffcodecdata.properties) {
 		IDP_FreeProperty(sce->r.ffcodecdata.properties);
 		MEM_freeN(sce->r.ffcodecdata.properties);
@@ -539,7 +624,7 @@ void BKE_scene_free_ex(Scene *sce, const bool do_id_user)
 	BLI_freelistN(&sce->markers);
 	BLI_freelistN(&sce->r.layers);
 	BLI_freelistN(&sce->r.views);
-
+	
 	if (sce->toolsettings) {
 		if (sce->toolsettings->vpaint) {
 			BKE_paint_free(&sce->toolsettings->vpaint->paint);
@@ -573,8 +658,8 @@ void BKE_scene_free_ex(Scene *sce, const bool do_id_user)
 	}
 	
 	DEG_scene_graph_free(sce);
-	if (sce->depsgraph)
-		DEG_graph_free(sce->depsgraph);
+	if (sce->depsgraph_legacy)
+		DEG_graph_free(sce->depsgraph_legacy);
 
 	MEM_SAFE_FREE(sce->fps_info);
 
@@ -614,7 +699,7 @@ void BKE_scene_free_ex(Scene *sce, const bool do_id_user)
 
 void BKE_scene_free(Scene *sce)
 {
-	return BKE_scene_free_ex(sce, true);
+	BKE_scene_free_ex(sce, true);
 }
 
 void BKE_scene_init(Scene *sce)
@@ -710,7 +795,7 @@ void BKE_scene_init(Scene *sce)
 
 	sce->r.seq_prev_type = OB_SOLID;
 	sce->r.seq_rend_type = OB_SOLID;
-	sce->r.seq_flag = R_SEQ_GL_PREV;
+	sce->r.seq_flag = 0;
 
 	sce->r.threads = 1;
 
@@ -818,7 +903,7 @@ void BKE_scene_init(Scene *sce)
 	sce->r.ffcodecdata.audio_bitrate = 192;
 	sce->r.ffcodecdata.audio_channels = 2;
 
-	BLI_strncpy(sce->r.engine, RE_engine_id_BLENDER_RENDER, sizeof(sce->r.engine));
+	BLI_strncpy(sce->r.engine, RE_engine_id_BLENDER_EEVEE, sizeof(sce->r.engine));
 
 	sce->audio.distance_model = 2.0f;
 	sce->audio.doppler_factor = 1.0f;
@@ -984,7 +1069,7 @@ Scene *BKE_scene_add(Main *bmain, const char *name)
 {
 	Scene *sce;
 
-	sce = BKE_libblock_alloc(bmain, ID_SCE, name);
+	sce = BKE_libblock_alloc(bmain, ID_SCE, name, 0);
 	id_us_min(&sce->id);
 	id_us_ensure_real(&sce->id);
 
@@ -1074,8 +1159,9 @@ Scene *BKE_scene_set_name(Main *bmain, const char *name)
 }
 
 /* Used by metaballs, return *all* objects (including duplis) existing in the scene (including scene's sets) */
-int BKE_scene_base_iter_next(EvaluationContext *eval_ctx, SceneBaseIter *iter,
-                             Scene **scene, int val, BaseLegacy **base, Object **ob)
+int BKE_scene_base_iter_next(
+        const EvaluationContext *eval_ctx, SceneBaseIter *iter,
+        Scene **scene, int val, BaseLegacy **base, Object **ob)
 {
 	bool run_again = true;
 	
@@ -1517,7 +1603,7 @@ void BKE_scene_update_tagged(EvaluationContext *eval_ctx, Main *bmain, Scene *sc
 	prepare_mesh_for_viewport_render(bmain, scene);
 
 	/* flush recalc flags to dependencies */
-	DEG_ids_flush_tagged(bmain);
+	DEG_scene_flush_update(bmain, scene);
 
 	/* removed calls to quick_cache, see pointcache.c */
 	
@@ -1532,9 +1618,7 @@ void BKE_scene_update_tagged(EvaluationContext *eval_ctx, Main *bmain, Scene *sc
 	 *
 	 * in the future this should handle updates for all datablocks, not
 	 * only objects and scenes. - brecht */
-	DEG_evaluate_on_refresh(eval_ctx, scene->depsgraph, scene);
-	/* TODO(sergey): This is to beocme a node in new depsgraph. */
-	BKE_mask_update_scene(bmain, scene);
+	DEG_evaluate_on_refresh(eval_ctx, scene->depsgraph_legacy, scene);
 
 	/* update sound system animation (TODO, move to depsgraph) */
 	BKE_sound_update_scene(bmain, scene);
@@ -1571,15 +1655,13 @@ void BKE_scene_update_for_newframe(EvaluationContext *eval_ctx, Main *bmain, Sce
 	BKE_image_update_frame(bmain, sce->r.cfra);
 
 	BKE_sound_set_cfra(sce->r.cfra);
-
+	
 	/* clear animation overrides */
 	/* XXX TODO... */
 
 	for (sce_iter = sce; sce_iter; sce_iter = sce_iter->set)
 		DEG_scene_relations_update(bmain, sce_iter);
 
-	BKE_mask_evaluate_all_masks(bmain, ctime, true);
-
 	/* Update animated cache files for modifiers. */
 	BKE_cachefile_update_frame(bmain, sce, ctime, (((double)sce->r.frs_sec) / (double)sce->r.frs_sec_base));
 
@@ -1594,7 +1676,7 @@ void BKE_scene_update_for_newframe(EvaluationContext *eval_ctx, Main *bmain, Sce
 	BKE_main_id_tag_idcode(bmain, ID_LA, LIB_TAG_DOIT, false);
 
 	/* BKE_object_handle_update() on all objects, groups and sets */
-	DEG_evaluate_on_framechange(eval_ctx, bmain, sce->depsgraph, ctime);
+	DEG_evaluate_on_framechange(eval_ctx, bmain, sce->depsgraph_legacy, ctime);
 
 	/* update sound system animation (TODO, move to depsgraph) */
 	BKE_sound_update_scene(bmain, sce);
@@ -1764,7 +1846,7 @@ Base *_setlooper_base_step(Scene **sce_iter, Base *base)
 		/* first time looping, return the scenes first base */
 
 		/* for the first loop we should get the layer from context */
-		SceneLayer *sl = BKE_scene_layer_context_active((*sce_iter));
+		SceneLayer *sl = BKE_scene_layer_context_active_PLACEHOLDER((*sce_iter));
 		/* TODO For first scene (non-background set), we should pass the render layer as argument.
 		 * In some cases we want it to be the workspace one, in other the scene one. */
 		TODO_LAYER;
@@ -1779,7 +1861,7 @@ Base *_setlooper_base_step(Scene **sce_iter, Base *base)
 next_set:
 		/* reached the end, get the next base in the set */
 		while ((*sce_iter = (*sce_iter)->set)) {
-			SceneLayer *sl = BKE_scene_layer_render_active((*sce_iter));
+			SceneLayer *sl = BKE_scene_layer_from_scene_get((*sce_iter));
 			base = (Base *)sl->object_bases.first;
 
 			if (base) {
@@ -1935,6 +2017,14 @@ int BKE_scene_num_threads(const Scene *scene)
 	return BKE_render_num_threads(&scene->r);
 }
 
+int BKE_render_preview_pixel_size(const RenderData *r)
+{
+	if (r->preview_pixel_size == 0) {
+		return (U.pixelsize > 1.5f) ? 2 : 1;
+	}
+	return r->preview_pixel_size;
+}
+
 /* Apply the needed correction factor to value, based on unit_type (only length-related are affected currently)
  * and unit->scale_length.
  */
@@ -2240,3 +2330,9 @@ int BKE_scene_multiview_num_videos_get(const RenderData *rd)
 		return BKE_scene_multiview_num_views_get(rd);
 	}
 }
+
+Depsgraph *BKE_scene_get_depsgraph(Scene *scene, SceneLayer *scene_layer)
+{
+	(void) scene_layer;
+	return scene->depsgraph_legacy;
+}
diff --git a/source/blender/blenkernel/intern/screen.c b/source/blender/blenkernel/intern/screen.c
index f3a93a0a42c..6bd88099792 100644
--- a/source/blender/blenkernel/intern/screen.c
+++ b/source/blender/blenkernel/intern/screen.c
@@ -185,6 +185,7 @@ ARegion *BKE_area_region_copy(SpaceType *st, ARegion *ar)
 	newar->swinid = 0;
 	newar->manipulator_map = NULL;
 	newar->regiontimer = NULL;
+	newar->headerstr = NULL;
 	
 	/* use optional regiondata callback */
 	if (ar->regiondata) {
@@ -292,6 +293,32 @@ void BKE_spacedata_id_unref(struct ScrArea *sa, struct SpaceLink *sl, struct ID
 	}
 }
 
+/**
+ * Avoid bad-level calls to #WM_manipulatormap_tag_refresh.
+ */
+static void (*region_refresh_tag_manipulatormap_callback)(struct wmManipulatorMap *) = NULL;
+
+void BKE_region_callback_refresh_tag_manipulatormap_set(void (*callback)(struct wmManipulatorMap *))
+{
+	region_refresh_tag_manipulatormap_callback = callback;
+}
+
+void BKE_screen_manipulator_tag_refresh(struct bScreen *sc)
+{
+	if (region_refresh_tag_manipulatormap_callback == NULL) {
+		return;
+	}
+
+	ScrArea *sa;
+	ARegion *ar;
+	for (sa = sc->areabase.first; sa; sa = sa->next) {
+		for (ar = sa->regionbase.first; ar; ar = ar->next) {
+			if (ar->manipulator_map != NULL) {
+				region_refresh_tag_manipulatormap_callback(ar->manipulator_map);
+			}
+		}
+	}
+}
 
 /**
  * Avoid bad-level calls to #WM_manipulatormap_delete.
@@ -353,7 +380,10 @@ void BKE_area_region_free(SpaceType *st, ARegion *ar)
 		}
 	}
 
-	region_free_manipulatormap_callback(ar->manipulator_map);
+	if (ar->manipulator_map != NULL) {
+		region_free_manipulatormap_callback(ar->manipulator_map);
+	}
+
 	BLI_freelistN(&ar->ui_lists);
 	BLI_freelistN(&ar->ui_previews);
 	BLI_freelistN(&ar->panels_category);
diff --git a/source/blender/blenkernel/intern/seqeffects.c b/source/blender/blenkernel/intern/seqeffects.c
index e435d87024e..a2c45057bf7 100644
--- a/source/blender/blenkernel/intern/seqeffects.c
+++ b/source/blender/blenkernel/intern/seqeffects.c
@@ -1861,7 +1861,7 @@ static void RVBlurBitmap2_float(float *map, int width, int height, float blur, i
 	float *filter = NULL;
 	int x, y, i, fx, fy;
 	int index, ix, halfWidth;
-	float fval, k, curColor[3], curColor2[3], weight = 0;
+	float fval, k, curColor[4], curColor2[4], weight = 0;
 
 	/* If we're not really blurring, bail out */
 	if (blur <= 0)
@@ -1906,47 +1906,38 @@ static void RVBlurBitmap2_float(float *map, int width, int height, float blur, i
 	for (y = 0; y < height; y++) {
 		/* Do the left & right strips */
 		for (x = 0; x < halfWidth; x++) {
-			index = (x + y * width) * 4;
 			fx = 0;
-			curColor[0] = curColor[1] = curColor[2] = 0.0f;
-			curColor2[0] = curColor2[1] = curColor2[2] = 0.0f;
+			zero_v4(curColor);
+			zero_v4(curColor2);
 
 			for (i = x - halfWidth; i < x + halfWidth; i++) {
 				if ((i >= 0) && (i < width)) {
-					curColor[0] += map[(i + y * width) * 4 + GlowR] * filter[fx];
-					curColor[1] += map[(i + y * width) * 4 + GlowG] * filter[fx];
-					curColor[2] += map[(i + y * width) * 4 + GlowB] * filter[fx];
+					index = (i + y * width) * 4;
+					madd_v4_v4fl(curColor, map + index, filter[fx]);
 
-					curColor2[0] += map[(width - 1 - i + y * width) * 4 + GlowR] * filter[fx];
-					curColor2[1] += map[(width - 1 - i + y * width) * 4 + GlowG] * filter[fx];
-					curColor2[2] += map[(width - 1 - i + y * width) * 4 + GlowB] * filter[fx];
+					index = (width - 1 - i + y * width) * 4;
+					madd_v4_v4fl(curColor2, map + index, filter[fx]);
 				}
 				fx++;
 			}
-			temp[index + GlowR] = curColor[0];
-			temp[index + GlowG] = curColor[1];
-			temp[index + GlowB] = curColor[2];
-
-			temp[((width - 1 - x + y * width) * 4) + GlowR] = curColor2[0];
-			temp[((width - 1 - x + y * width) * 4) + GlowG] = curColor2[1];
-			temp[((width - 1 - x + y * width) * 4) + GlowB] = curColor2[2];
+			index = (x + y * width) * 4;
+			copy_v4_v4(temp + index, curColor);
 
+			index = (width - 1 - x + y * width) * 4;
+			copy_v4_v4(temp + index, curColor2);
 		}
 
 		/* Do the main body */
 		for (x = halfWidth; x < width - halfWidth; x++) {
-			index = (x + y * width) * 4;
 			fx = 0;
-			zero_v3(curColor);
+			zero_v4(curColor);
 			for (i = x - halfWidth; i < x + halfWidth; i++) {
-				curColor[0] += map[(i + y * width) * 4 + GlowR] * filter[fx];
-				curColor[1] += map[(i + y * width) * 4 + GlowG] * filter[fx];
-				curColor[2] += map[(i + y * width) * 4 + GlowB] * filter[fx];
+				index = (i + y * width) * 4;
+				madd_v4_v4fl(curColor, map + index, filter[fx]);
 				fx++;
 			}
-			temp[index + GlowR] = curColor[0];
-			temp[index + GlowG] = curColor[1];
-			temp[index + GlowB] = curColor[2];
+			index = (x + y * width) * 4;
+			copy_v4_v4(temp + index, curColor);
 		}
 	}
 
@@ -1957,46 +1948,39 @@ static void RVBlurBitmap2_float(float *map, int width, int height, float blur, i
 	for (x = 0; x < width; x++) {
 		/* Do the top & bottom strips */
 		for (y = 0; y < halfWidth; y++) {
-			index = (x + y * width) * 4;
 			fy = 0;
-			zero_v3(curColor);
-			zero_v3(curColor2);
+			zero_v4(curColor);
+			zero_v4(curColor2);
 			for (i = y - halfWidth; i < y + halfWidth; i++) {
 				if ((i >= 0) && (i < height)) {
 					/* Bottom */
-					curColor[0] += map[(x + i * width) * 4 + GlowR] * filter[fy];
-					curColor[1] += map[(x + i * width) * 4 + GlowG] * filter[fy];
-					curColor[2] += map[(x + i * width) * 4 + GlowB] * filter[fy];
+					index = (x + i * width) * 4;
+					madd_v4_v4fl(curColor, map + index, filter[fy]);
 
 					/* Top */
-					curColor2[0] += map[(x + (height - 1 - i) * width) * 4 + GlowR] * filter[fy];
-					curColor2[1] += map[(x + (height - 1 - i) * width) * 4 + GlowG] * filter[fy];
-					curColor2[2] += map[(x + (height - 1 - i) * width) * 4 + GlowB] * filter[fy];
+					index = (x + (height - 1 - i) * width) * 4;
+					madd_v4_v4fl(curColor2, map + index, filter[fy]);
 				}
 				fy++;
 			}
-			temp[index + GlowR] = curColor[0];
-			temp[index + GlowG] = curColor[1];
-			temp[index + GlowB] = curColor[2];
-			temp[((x + (height - 1 - y) * width) * 4) + GlowR] = curColor2[0];
-			temp[((x + (height - 1 - y) * width) * 4) + GlowG] = curColor2[1];
-			temp[((x + (height - 1 - y) * width) * 4) + GlowB] = curColor2[2];
+			index = (x + y * width) * 4;
+			copy_v4_v4(temp + index, curColor);
+
+			index = (x + (height - 1 - y) * width) * 4;
+			copy_v4_v4(temp + index, curColor2);
 		}
 	
 		/* Do the main body */
 		for (y = halfWidth; y < height - halfWidth; y++) {
-			index = (x + y * width) * 4;
 			fy = 0;
-			zero_v3(curColor);
+			zero_v4(curColor);
 			for (i = y - halfWidth; i < y + halfWidth; i++) {
-				curColor[0] += map[(x + i * width) * 4 + GlowR] * filter[fy];
-				curColor[1] += map[(x + i * width) * 4 + GlowG] * filter[fy];
-				curColor[2] += map[(x + i * width) * 4 + GlowB] * filter[fy];
+				index = (x + i * width) * 4;
+				madd_v4_v4fl(curColor, map + index, filter[fy]);
 				fy++;
 			}
-			temp[index + GlowR] = curColor[0];
-			temp[index + GlowG] = curColor[1];
-			temp[index + GlowB] = curColor[2];
+			index = (x + y * width) * 4;
+			copy_v4_v4(temp + index, curColor);
 		}
 	}
 
@@ -2015,10 +1999,10 @@ static void RVAddBitmaps_float(float *a, float *b, float *c, int width, int heig
 	for (y = 0; y < height; y++) {
 		for (x = 0; x < width; x++) {
 			index = (x + y * width) * 4;
-			c[index + GlowR] = MIN2(1.0f, a[index + GlowR] + b[index + GlowR]);
-			c[index + GlowG] = MIN2(1.0f, a[index + GlowG] + b[index + GlowG]);
-			c[index + GlowB] = MIN2(1.0f, a[index + GlowB] + b[index + GlowB]);
-			c[index + GlowA] = MIN2(1.0f, a[index + GlowA] + b[index + GlowA]);
+			c[index + GlowR] = min_ff(1.0f, a[index + GlowR] + b[index + GlowR]);
+			c[index + GlowG] = min_ff(1.0f, a[index + GlowG] + b[index + GlowG]);
+			c[index + GlowB] = min_ff(1.0f, a[index + GlowB] + b[index + GlowB]);
+			c[index + GlowA] = min_ff(1.0f, a[index + GlowA] + b[index + GlowA]);
 		}
 	}
 }
@@ -2035,10 +2019,10 @@ static void RVIsolateHighlights_float(float *in, float *out, int width, int heig
 			/* Isolate the intensity */
 			intensity = (in[index + GlowR] + in[index + GlowG] + in[index + GlowB] - threshold);
 			if (intensity > 0) {
-				out[index + GlowR] = MIN2(clamp, (in[index + GlowR] * boost * intensity));
-				out[index + GlowG] = MIN2(clamp, (in[index + GlowG] * boost * intensity));
-				out[index + GlowB] = MIN2(clamp, (in[index + GlowB] * boost * intensity));
-				out[index + GlowA] = MIN2(clamp, (in[index + GlowA] * boost * intensity));
+				out[index + GlowR] = min_ff(clamp, (in[index + GlowR] * boost * intensity));
+				out[index + GlowG] = min_ff(clamp, (in[index + GlowG] * boost * intensity));
+				out[index + GlowB] = min_ff(clamp, (in[index + GlowB] * boost * intensity));
+				out[index + GlowA] = min_ff(clamp, (in[index + GlowA] * boost * intensity));
 			}
 			else {
 				out[index + GlowR] = 0;
diff --git a/source/blender/blenkernel/intern/sequencer.c b/source/blender/blenkernel/intern/sequencer.c
index e316b7f26e9..c6b6f97b0bc 100644
--- a/source/blender/blenkernel/intern/sequencer.c
+++ b/source/blender/blenkernel/intern/sequencer.c
@@ -91,7 +91,7 @@
 #include "BKE_sound.h"
 
 #ifdef WITH_AUDASPACE
-#  include AUD_SPECIAL_H
+#  include <AUD_Special.h>
 #endif
 
 /* mutable state for sequencer */
@@ -379,6 +379,8 @@ static void seqclipboard_ptr_restore(Main *bmain, ID **id_pt)
 					}
 					break;
 				}
+				default:
+					break;
 			}
 		}
 
@@ -482,9 +484,12 @@ void BKE_sequencer_editing_free(Scene *scene)
 
 static void sequencer_imbuf_assign_spaces(Scene *scene, ImBuf *ibuf)
 {
+#if 0
+	/* Bute buffer is supposed to be in sequencer working space already. */
 	if (ibuf->rect != NULL) {
 		IMB_colormanagement_assign_rect_colorspace(ibuf, scene->sequencer_colorspace_settings.name);
 	}
+#endif
 	if (ibuf->rect_float != NULL) {
 		IMB_colormanagement_assign_float_colorspace(ibuf, scene->sequencer_colorspace_settings.name);
 	}
@@ -2084,7 +2089,7 @@ void BKE_sequencer_proxy_set(struct Sequence *seq, bool value)
 		}
 	}
 	else {
-		seq->flag ^= SEQ_USE_PROXY;
+		seq->flag &= ~SEQ_USE_PROXY;
 	}	
 }
 
@@ -3235,7 +3240,7 @@ static ImBuf *seq_render_scene_strip(const SeqRenderData *context, Sequence *seq
 	const bool is_background = G.background;
 	const bool do_seq_gl = is_rendering ?
 	        0 /* (context->scene->r.seq_flag & R_SEQ_GL_REND) */ :
-	        (context->scene->r.seq_flag & R_SEQ_GL_PREV) != 0;
+	        (context->scene->r.seq_prev_type) != OB_RENDER;
 	// bool have_seq = false;  /* UNUSED */
 	bool have_comp = false;
 	bool use_gpencil = true;
@@ -3306,7 +3311,7 @@ static ImBuf *seq_render_scene_strip(const SeqRenderData *context, Sequence *seq
 		BKE_scene_update_for_newframe(context->eval_ctx, context->bmain, scene);
 		ibuf = sequencer_view3d_cb(
 		        /* set for OpenGL render (NULL when scrubbing) */
-		        scene, BKE_scene_layer_render_active(scene), camera, width, height, IB_rect,
+		        context->eval_ctx, scene, BKE_scene_layer_from_scene_get(scene), camera, width, height, IB_rect,
 		        context->scene->r.seq_prev_type,
 		        (context->scene->r.seq_flag & R_SEQ_SOLID_TEX) != 0,
 		        use_gpencil, use_background, scene->r.alphamode,
@@ -3317,7 +3322,7 @@ static ImBuf *seq_render_scene_strip(const SeqRenderData *context, Sequence *seq
 		}
 	}
 	else {
-		Render *re = RE_GetRender(scene->id.name);
+		Render *re = RE_GetSceneRender(scene);
 		const int totviews = BKE_scene_multiview_num_views_get(&scene->r);
 		int i;
 		ImBuf **ibufs_arr;
@@ -3334,7 +3339,7 @@ static ImBuf *seq_render_scene_strip(const SeqRenderData *context, Sequence *seq
 		 */
 		if (!is_thread_main || is_rendering == false || is_background || context->eval_ctx->mode == DAG_EVAL_RENDER) {
 			if (re == NULL)
-				re = RE_NewRender(scene->id.name);
+				re = RE_NewSceneRender(scene);
 
 			BKE_scene_update_for_newframe(context->eval_ctx, context->bmain, scene);
 			RE_BlenderFrame(re, context->bmain, scene, NULL, camera, scene->lay, frame, false);
@@ -5373,9 +5378,8 @@ Sequence *BKE_sequencer_add_movie_strip(bContext *C, ListBase *seqbasep, SeqLoad
 	return seq;
 }
 
-static Sequence *seq_dupli(Scene *scene, Scene *scene_to, Sequence *seq, int dupe_flag)
+static Sequence *seq_dupli(const Scene *scene_src, Scene *scene_dst, Sequence *seq, int dupe_flag, const int flag)
 {
-	Scene *sce_audio = scene_to ? scene_to : scene;
 	Sequence *seqn = MEM_dupallocN(seq);
 
 	seq->tmp = seqn;
@@ -5399,7 +5403,7 @@ static Sequence *seq_dupli(Scene *scene, Scene *scene_to, Sequence *seq, int dup
 	}
 
 	if (seq->prop) {
-		seqn->prop = IDP_CopyProperty(seq->prop);
+		seqn->prop = IDP_CopyProperty_ex(seq->prop, flag);
 	}
 
 	if (seqn->modifiers.first) {
@@ -5418,7 +5422,7 @@ static Sequence *seq_dupli(Scene *scene, Scene *scene_to, Sequence *seq, int dup
 	else if (seq->type == SEQ_TYPE_SCENE) {
 		seqn->strip->stripdata = NULL;
 		if (seq->scene_sound)
-			seqn->scene_sound = BKE_sound_scene_add_scene_sound_defaults(sce_audio, seqn);
+			seqn->scene_sound = BKE_sound_scene_add_scene_sound_defaults(scene_dst, seqn);
 	}
 	else if (seq->type == SEQ_TYPE_MOVIECLIP) {
 		/* avoid assert */
@@ -5435,9 +5439,11 @@ static Sequence *seq_dupli(Scene *scene, Scene *scene_to, Sequence *seq, int dup
 		seqn->strip->stripdata =
 		        MEM_dupallocN(seq->strip->stripdata);
 		if (seq->scene_sound)
-			seqn->scene_sound = BKE_sound_add_scene_sound_defaults(sce_audio, seqn);
+			seqn->scene_sound = BKE_sound_add_scene_sound_defaults(scene_dst, seqn);
 
-		id_us_plus((ID *)seqn->sound);
+		if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+			id_us_plus((ID *)seqn->sound);
+		}
 	}
 	else if (seq->type == SEQ_TYPE_IMAGE) {
 		seqn->strip->stripdata =
@@ -5457,11 +5463,15 @@ static Sequence *seq_dupli(Scene *scene, Scene *scene_to, Sequence *seq, int dup
 		BLI_assert(0);
 	}
 
-	if (dupe_flag & SEQ_DUPE_UNIQUE_NAME)
-		BKE_sequence_base_unique_name_recursive(&scene->ed->seqbase, seqn);
+	if (scene_src == scene_dst) {
+		if (dupe_flag & SEQ_DUPE_UNIQUE_NAME) {
+			BKE_sequence_base_unique_name_recursive(&scene_dst->ed->seqbase, seqn);
+		}
 
-	if (dupe_flag & SEQ_DUPE_ANIM)
-		BKE_sequencer_dupe_animdata(scene, seq->name + 2, seqn->name + 2);
+		if (dupe_flag & SEQ_DUPE_ANIM) {
+			BKE_sequencer_dupe_animdata(scene_dst, seq->name + 2, seqn->name + 2);
+		}
+	}
 
 	return seqn;
 }
@@ -5488,16 +5498,16 @@ static void seq_new_fix_links_recursive(Sequence *seq)
 	}
 }
 
-Sequence *BKE_sequence_dupli_recursive(Scene *scene, Scene *scene_to, Sequence *seq, int dupe_flag)
+Sequence *BKE_sequence_dupli_recursive(const Scene *scene_src, Scene *scene_dst, Sequence *seq, int dupe_flag)
 {
 	Sequence *seqn;
 
 	seq->tmp = NULL;
-	seqn = seq_dupli(scene, scene_to, seq, dupe_flag);
+	seqn = seq_dupli(scene_src, scene_dst, seq, dupe_flag, 0);
 	if (seq->type == SEQ_TYPE_META) {
 		Sequence *s;
 		for (s = seq->seqbase.first; s; s = s->next) {
-			Sequence *n = BKE_sequence_dupli_recursive(scene, scene_to, s, dupe_flag);
+			Sequence *n = BKE_sequence_dupli_recursive(scene_src, scene_dst, s, dupe_flag);
 			if (n) {
 				BLI_addtail(&seqn->seqbase, n);
 			}
@@ -5510,19 +5520,19 @@ Sequence *BKE_sequence_dupli_recursive(Scene *scene, Scene *scene_to, Sequence *
 }
 
 void BKE_sequence_base_dupli_recursive(
-        Scene *scene, Scene *scene_to, ListBase *nseqbase, ListBase *seqbase,
-        int dupe_flag)
+        const Scene *scene_src, Scene *scene_dst, ListBase *nseqbase, const ListBase *seqbase,
+        int dupe_flag, const int flag)
 {
 	Sequence *seq;
 	Sequence *seqn = NULL;
-	Sequence *last_seq = BKE_sequencer_active_get(scene);
+	Sequence *last_seq = BKE_sequencer_active_get((Scene *)scene_src);
 	/* always include meta's strips */
 	int dupe_flag_recursive = dupe_flag | SEQ_DUPE_ALL;
 
 	for (seq = seqbase->first; seq; seq = seq->next) {
 		seq->tmp = NULL;
 		if ((seq->flag & SELECT) || (dupe_flag & SEQ_DUPE_ALL)) {
-			seqn = seq_dupli(scene, scene_to, seq, dupe_flag);
+			seqn = seq_dupli(scene_src, scene_dst, seq, dupe_flag, flag);
 			if (seqn) { /*should never fail */
 				if (dupe_flag & SEQ_DUPE_CONTEXT) {
 					seq->flag &= ~SEQ_ALLSEL;
@@ -5532,13 +5542,13 @@ void BKE_sequence_base_dupli_recursive(
 				BLI_addtail(nseqbase, seqn);
 				if (seq->type == SEQ_TYPE_META) {
 					BKE_sequence_base_dupli_recursive(
-					        scene, scene_to, &seqn->seqbase, &seq->seqbase,
-					        dupe_flag_recursive);
+					        scene_src, scene_dst, &seqn->seqbase, &seq->seqbase,
+					        dupe_flag_recursive, flag);
 				}
 
 				if (dupe_flag & SEQ_DUPE_CONTEXT) {
 					if (seq == last_seq) {
-						BKE_sequencer_active_set(scene, seqn);
+						BKE_sequencer_active_set(scene_dst, seqn);
 					}
 				}
 			}
diff --git a/source/blender/blenkernel/intern/shrinkwrap.c b/source/blender/blenkernel/intern/shrinkwrap.c
index 7094d5a3547..f9d1793d7cb 100644
--- a/source/blender/blenkernel/intern/shrinkwrap.c
+++ b/source/blender/blenkernel/intern/shrinkwrap.c
@@ -152,6 +152,9 @@ static void shrinkwrap_calc_nearest_vertex(ShrinkwrapCalcData *calc)
 	BVHTreeFromMesh treeData = NULL_BVHTreeFromMesh;
 	BVHTreeNearest nearest  = NULL_BVHTreeNearest;
 
+	if (calc->target != NULL && calc->target->getNumVerts(calc->target) == 0) {
+		return;
+	}
 
 	TIMEIT_BENCH(bvhtree_from_mesh_verts(&treeData, calc->target, 0.0, 2, 6), bvhtree_verts);
 	if (treeData.tree == NULL) {
@@ -376,6 +379,9 @@ static void shrinkwrap_calc_normal_projection(ShrinkwrapCalcData *calc, bool for
 	if ((calc->smd->shrinkOpts & (MOD_SHRINKWRAP_PROJECT_ALLOW_POS_DIR | MOD_SHRINKWRAP_PROJECT_ALLOW_NEG_DIR)) == 0)
 		return;
 
+	if (calc->target != NULL && calc->target->getNumPolys(calc->target) == 0) {
+		return;
+	}
 
 	/* Prepare data to retrieve the direction in which we should project each vertex */
 	if (calc->smd->projAxis == MOD_SHRINKWRAP_PROJECT_OVER_NORMAL) {
@@ -432,7 +438,7 @@ static void shrinkwrap_calc_normal_projection(ShrinkwrapCalcData *calc, bool for
 	if (targ_tree) {
 		BVHTree *aux_tree = NULL;
 		void *aux_callback = NULL;
-		if (auxMesh != NULL) {
+		if (auxMesh != NULL && auxMesh->getNumPolys(auxMesh) != 0) {
 			/* use editmesh to avoid array allocation */
 			if (calc->smd->auxTarget && auxMesh->type == DM_TYPE_EDITBMESH) {
 				emaux = BKE_editmesh_from_object(calc->smd->auxTarget);
@@ -560,6 +566,10 @@ static void shrinkwrap_calc_nearest_surface_point(ShrinkwrapCalcData *calc)
 	BVHTreeFromMesh treeData = NULL_BVHTreeFromMesh;
 	BVHTreeNearest nearest  = NULL_BVHTreeNearest;
 
+	if (calc->target->getNumPolys(calc->target) == 0) {
+		return;
+	}
+
 	/* Create a bvh-tree of the given target */
 	bvhtree_from_mesh_looptri(&treeData, calc->target, 0.0, 2, 6);
 	if (treeData.tree == NULL) {
diff --git a/source/blender/blenkernel/intern/smoke.c b/source/blender/blenkernel/intern/smoke.c
index 667f8d1e8c7..7ea985a311b 100644
--- a/source/blender/blenkernel/intern/smoke.c
+++ b/source/blender/blenkernel/intern/smoke.c
@@ -83,6 +83,8 @@
 #include "BKE_smoke.h"
 #include "BKE_texture.h"
 
+#include "DEG_depsgraph.h"
+
 #include "RE_shader_ext.h"
 
 #include "GPU_glew.h"
@@ -126,7 +128,7 @@ void smoke_initWaveletBlenderRNA(struct WTURBULENCE *UNUSED(wt), float *UNUSED(s
 void smoke_initBlenderRNA(struct FLUID_3D *UNUSED(fluid), float *UNUSED(alpha), float *UNUSED(beta), float *UNUSED(dt_factor), float *UNUSED(vorticity),
                           int *UNUSED(border_colli), float *UNUSED(burning_rate), float *UNUSED(flame_smoke), float *UNUSED(flame_smoke_color),
                           float *UNUSED(flame_vorticity), float *UNUSED(flame_ignition_temp), float *UNUSED(flame_max_temp)) {}
-struct DerivedMesh *smokeModifier_do(SmokeModifierData *UNUSED(smd), Scene *UNUSED(scene), SceneLayer *UNUSED(sl), Object *UNUSED(ob), DerivedMesh *UNUSED(dm)) { return NULL; }
+struct DerivedMesh *smokeModifier_do(SmokeModifierData *UNUSED(smd), const struct EvaluationContext *UNUSED(eval_ctx), Scene *UNUSED(scene), Object *UNUSED(ob), DerivedMesh *UNUSED(dm)) { return NULL; }
 float smoke_get_velocity_at(struct Object *UNUSED(ob), float UNUSED(position[3]), float UNUSED(velocity[3])) { return 0.0f; }
 
 #endif /* WITH_SMOKE */
@@ -677,7 +679,7 @@ void smokeModifier_copy(struct SmokeModifierData *smd, struct SmokeModifierData
 
 		tsmd->flow->texture_size = smd->flow->texture_size;
 		tsmd->flow->texture_offset = smd->flow->texture_offset;
-		BLI_strncpy(tsmd->flow->uvlayer_name, tsmd->flow->uvlayer_name, sizeof(tsmd->flow->uvlayer_name));
+		BLI_strncpy(tsmd->flow->uvlayer_name, smd->flow->uvlayer_name, sizeof(tsmd->flow->uvlayer_name));
 		tsmd->flow->vgroup_density = smd->flow->vgroup_density;
 
 		tsmd->flow->type = smd->flow->type;
@@ -702,7 +704,7 @@ static int get_lamp(SceneLayer *sl, float *light)
 	int found_lamp = 0;
 
 	// try to find a lamp, preferably local
-	for (base_tmp = FIRSTBASE_NEW; base_tmp; base_tmp = base_tmp->next) {
+	for (base_tmp = FIRSTBASE_NEW(sl); base_tmp; base_tmp = base_tmp->next) {
 		if (base_tmp->object->type == OB_LAMP) {
 			Lamp *la = base_tmp->object->data;
 
@@ -2071,7 +2073,7 @@ BLI_INLINE void apply_inflow_fields(SmokeFlowSettings *sfs, float emission_value
 	}
 }
 
-static void update_flowsfluids(Scene *scene, Object *ob, SmokeDomainSettings *sds, float dt)
+static void update_flowsfluids(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, SmokeDomainSettings *sds, float dt)
 {
 	Object **flowobjs = NULL;
 	EmissionMap *emaps = NULL;
@@ -2178,7 +2180,7 @@ static void update_flowsfluids(Scene *scene, Object *ob, SmokeDomainSettings *sd
 					else { /* MOD_SMOKE_FLOW_SOURCE_MESH */
 						/* update flow object frame */
 						BLI_mutex_lock(&object_update_lock);
-						BKE_object_modifier_update_subframe(scene, collob, true, 5, BKE_scene_frame_get(scene), eModifierType_Smoke);
+						BKE_object_modifier_update_subframe(eval_ctx, scene, collob, true, 5, BKE_scene_frame_get(scene), eModifierType_Smoke);
 						BLI_mutex_unlock(&object_update_lock);
 
 						/* apply flow */
@@ -2487,12 +2489,12 @@ static void update_effectors_task_cb(void *userdata, const int x)
 	}
 }
 
-static void update_effectors(Scene *scene, Object *ob, SmokeDomainSettings *sds, float UNUSED(dt))
+static void update_effectors(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, SmokeDomainSettings *sds, float UNUSED(dt))
 {
 	ListBase *effectors;
 	/* make sure smoke flow influence is 0.0f */
 	sds->effector_weights->weight[PFIELD_SMOKEFLOW] = 0.0f;
-	effectors = pdInitEffectors(scene, ob, NULL, sds->effector_weights, true);
+	effectors = pdInitEffectors(eval_ctx, scene, ob, NULL, sds->effector_weights, true);
 
 	if (effectors) {
 		// precalculate wind forces
@@ -2516,7 +2518,7 @@ static void update_effectors(Scene *scene, Object *ob, SmokeDomainSettings *sds,
 	pdEndEffectors(&effectors);
 }
 
-static void step(Scene *scene, Object *ob, SmokeModifierData *smd, DerivedMesh *domain_dm, float fps)
+static void step(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, SmokeModifierData *smd, DerivedMesh *domain_dm, float fps)
 {
 	SmokeDomainSettings *sds = smd->domain;
 	/* stability values copied from wturbulence.cpp */
@@ -2586,11 +2588,11 @@ static void step(Scene *scene, Object *ob, SmokeModifierData *smd, DerivedMesh *
 	for (substep = 0; substep < totalSubsteps; substep++)
 	{
 		// calc animated obstacle velocities
-		update_flowsfluids(scene, ob, sds, dtSubdiv);
+		update_flowsfluids(eval_ctx, scene, ob, sds, dtSubdiv);
 		update_obstacles(scene, ob, sds, dtSubdiv, substep, totalSubsteps);
 
 		if (sds->total_cells > 1) {
-			update_effectors(scene, ob, sds, dtSubdiv); // DG TODO? problem --> uses forces instead of velocity, need to check how they need to be changed with variable dt
+			update_effectors(eval_ctx, scene, ob, sds, dtSubdiv); // DG TODO? problem --> uses forces instead of velocity, need to check how they need to be changed with variable dt
 			smoke_step(sds->fluid, gravity, dtSubdiv);
 		}
 	}
@@ -2683,7 +2685,8 @@ static DerivedMesh *createDomainGeometry(SmokeDomainSettings *sds, Object *ob)
 	return result;
 }
 
-static void smokeModifier_process(SmokeModifierData *smd, Scene *scene, SceneLayer *sl, Object *ob, DerivedMesh *dm)
+static void smokeModifier_process(
+        SmokeModifierData *smd, const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, DerivedMesh *dm)
 {
 	if ((smd->type & MOD_SMOKE_TYPE_FLOW))
 	{
@@ -2692,7 +2695,6 @@ static void smokeModifier_process(SmokeModifierData *smd, Scene *scene, SceneLay
 
 		if (smd->flow->dm) smd->flow->dm->release(smd->flow->dm);
 		smd->flow->dm = CDDM_copy(dm);
-		DM_ensure_looptri(smd->flow->dm);
 
 		if (scene->r.cfra > smd->time)
 		{
@@ -2715,7 +2717,6 @@ static void smokeModifier_process(SmokeModifierData *smd, Scene *scene, SceneLay
 				smd->coll->dm->release(smd->coll->dm);
 
 			smd->coll->dm = CDDM_copy(dm);
-			DM_ensure_looptri(smd->coll->dm);
 		}
 
 		smd->time = scene->r.cfra;
@@ -2806,11 +2807,11 @@ static void smokeModifier_process(SmokeModifierData *smd, Scene *scene, SceneLay
 
 			}
 
-			step(scene, ob, smd, dm, scene->r.frs_sec / scene->r.frs_sec_base);
+			step(eval_ctx, scene, ob, smd, dm, scene->r.frs_sec / scene->r.frs_sec_base);
 		}
 
 		// create shadows before writing cache so they get stored
-		smoke_calc_transparency(sds, sl);
+		smoke_calc_transparency(sds, eval_ctx->scene_layer);
 
 		if (sds->wt && sds->total_cells > 1) {
 			smoke_turbulence_step(sds->wt, sds->fluid);
@@ -2827,13 +2828,14 @@ static void smokeModifier_process(SmokeModifierData *smd, Scene *scene, SceneLay
 	}
 }
 
-struct DerivedMesh *smokeModifier_do(SmokeModifierData *smd, Scene *scene, SceneLayer *sl, Object *ob, DerivedMesh *dm)
+struct DerivedMesh *smokeModifier_do(
+        SmokeModifierData *smd, const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, DerivedMesh *dm)
 {
 	/* lock so preview render does not read smoke data while it gets modified */
 	if ((smd->type & MOD_SMOKE_TYPE_DOMAIN) && smd->domain)
 		BLI_rw_mutex_lock(smd->domain->fluid_mutex, THREAD_LOCK_WRITE);
 
-	smokeModifier_process(smd, scene, sl, ob, dm);
+	smokeModifier_process(smd, eval_ctx, scene, ob, dm);
 
 	if ((smd->type & MOD_SMOKE_TYPE_DOMAIN) && smd->domain)
 		BLI_rw_mutex_unlock(smd->domain->fluid_mutex);
diff --git a/source/blender/blenkernel/intern/softbody.c b/source/blender/blenkernel/intern/softbody.c
index 0b8c11f6dc8..1ba8fe83971 100644
--- a/source/blender/blenkernel/intern/softbody.c
+++ b/source/blender/blenkernel/intern/softbody.c
@@ -81,6 +81,8 @@ variables on the UI for now
 #include "BKE_mesh.h"
 #include "BKE_scene.h"
 
+#include "DEG_depsgraph.h"
+
 #include  "PIL_time.h"
 
 /* callbacks for errors and interrupts and some goo */
@@ -530,7 +532,7 @@ static void ccd_build_deflector_hash(SceneLayer *sl, Group *group, Object *verte
 		}
 	}
 	else {
-		for (Base *base = FIRSTBASE_NEW; base; base = base->next) {
+		for (Base *base = FIRSTBASE_NEW(sl); base; base = base->next) {
 			/*Only proceed for mesh object in same layer */
 			if (base->object->type == OB_MESH) {
 				ob = base->object;
@@ -576,7 +578,7 @@ static void ccd_update_deflector_hash(SceneLayer *sl, Group *group, Object *vert
 		}
 	}
 	else {
-		for (Base *base = FIRSTBASE_NEW; base; base = base->next) {
+		for (Base *base = FIRSTBASE_NEW(sl); base; base = base->next) {
 			/*Only proceed for mesh object in same layer */
 			if (base->object->type == OB_MESH) {
 				ob = base->object;
@@ -986,7 +988,7 @@ static bool are_there_deflectors(SceneLayer *sl, Group *group)
 		}
 	}
 	else {
-		for (Base *base = FIRSTBASE_NEW; base; base = base->next) {
+		for (Base *base = FIRSTBASE_NEW(sl); base; base = base->next) {
 			if (base->object->pd) {
 				if (base->object->pd->deflect)
 					return 1;
@@ -1544,12 +1546,12 @@ static void _scan_for_ext_spring_forces(Scene *scene, Object *ob, float timenow,
 }
 
 
-static void scan_for_ext_spring_forces(Scene *scene, Object *ob, float timenow)
+static void scan_for_ext_spring_forces(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float timenow)
 {
 	SoftBody *sb = ob->soft;
 	ListBase *do_effector = NULL;
 
-	do_effector = pdInitEffectors(scene, ob, NULL, sb->effector_weights, true);
+	do_effector = pdInitEffectors(eval_ctx, scene, ob, NULL, sb->effector_weights, true);
 	_scan_for_ext_spring_forces(scene, ob, timenow, 0, sb->totspring, do_effector);
 	pdEndEffectors(&do_effector);
 }
@@ -1561,7 +1563,7 @@ static void *exec_scan_for_ext_spring_forces(void *data)
 	return NULL;
 }
 
-static void sb_sfesf_threads_run(Scene *scene, struct Object *ob, float timenow, int totsprings, int *UNUSED(ptr_to_break_func(void)))
+static void sb_sfesf_threads_run(const struct EvaluationContext *eval_ctx, Scene *scene, struct Object *ob, float timenow, int totsprings, int *UNUSED(ptr_to_break_func(void)))
 {
 	ListBase *do_effector = NULL;
 	ListBase threads;
@@ -1569,7 +1571,7 @@ static void sb_sfesf_threads_run(Scene *scene, struct Object *ob, float timenow,
 	int i, totthread, left, dec;
 	int lowsprings =100; /* wild guess .. may increase with better thread management 'above' or even be UI option sb->spawn_cf_threads_nopts */
 
-	do_effector= pdInitEffectors(scene, ob, NULL, ob->soft->effector_weights, true);
+	do_effector= pdInitEffectors(eval_ctx, scene, ob, NULL, ob->soft->effector_weights, true);
 
 	/* figure the number of threads while preventing pretty pointless threading overhead */
 	totthread= BKE_scene_num_threads(scene);
@@ -2233,7 +2235,7 @@ static void sb_cf_threads_run(Scene *scene, Object *ob, float forcetime, float t
 	MEM_freeN(sb_threads);
 }
 
-static void softbody_calc_forcesEx(Scene *scene, SceneLayer *sl, Object *ob, float forcetime, float timenow)
+static void softbody_calc_forcesEx(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float forcetime, float timenow)
 {
 	/* rule we never alter free variables :bp->vec bp->pos in here !
 	 * this will ruin adaptive stepsize AKA heun! (BM)
@@ -2249,7 +2251,7 @@ static void softbody_calc_forcesEx(Scene *scene, SceneLayer *sl, Object *ob, flo
 	/* gravity = sb->grav * sb_grav_force_scale(ob); */ /* UNUSED */
 
 	/* check conditions for various options */
-	do_deflector= query_external_colliders(sl, sb->collision_group);
+	do_deflector= query_external_colliders(eval_ctx->scene_layer, sb->collision_group);
 	/* do_selfcollision=((ob->softflag & OB_SB_EDGES) && (sb->bspring)&& (ob->softflag & OB_SB_SELF)); */ /* UNUSED */
 	do_springcollision=do_deflector && (ob->softflag & OB_SB_EDGES) &&(ob->softflag & OB_SB_EDGECOLL);
 	do_aero=((sb->aeroedge)&& (ob->softflag & OB_SB_EDGES));
@@ -2258,10 +2260,10 @@ static void softbody_calc_forcesEx(Scene *scene, SceneLayer *sl, Object *ob, flo
 	/* bproot= sb->bpoint; */ /* need this for proper spring addressing */ /* UNUSED */
 
 	if (do_springcollision || do_aero)
-		sb_sfesf_threads_run(scene, ob, timenow, sb->totspring, NULL);
+		sb_sfesf_threads_run(eval_ctx, scene, ob, timenow, sb->totspring, NULL);
 
 	/* after spring scan because it uses Effoctors too */
-	do_effector= pdInitEffectors(scene, ob, NULL, sb->effector_weights, true);
+	do_effector= pdInitEffectors(eval_ctx, scene, ob, NULL, sb->effector_weights, true);
 
 	if (do_deflector) {
 		float defforce[3];
@@ -2278,11 +2280,11 @@ static void softbody_calc_forcesEx(Scene *scene, SceneLayer *sl, Object *ob, flo
 }
 
 
-static void softbody_calc_forces(Scene *scene, SceneLayer *sl, Object *ob, float forcetime, float timenow)
+static void softbody_calc_forces(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float forcetime, float timenow)
 {
 	/* redirection to the new threaded Version */
 	if (!(G.debug_value & 0x10)) { // 16
-		softbody_calc_forcesEx(scene, sl, ob, forcetime, timenow);
+		softbody_calc_forcesEx(eval_ctx, scene, ob, forcetime, timenow);
 		return;
 	}
 	else {
@@ -2313,7 +2315,7 @@ static void softbody_calc_forces(Scene *scene, SceneLayer *sl, Object *ob, float
 		}
 
 		/* check conditions for various options */
-		do_deflector= query_external_colliders(sl, sb->collision_group);
+		do_deflector= query_external_colliders(eval_ctx->scene_layer, sb->collision_group);
 		do_selfcollision=((ob->softflag & OB_SB_EDGES) && (sb->bspring)&& (ob->softflag & OB_SB_SELF));
 		do_springcollision=do_deflector && (ob->softflag & OB_SB_EDGES) &&(ob->softflag & OB_SB_EDGECOLL);
 		do_aero=((sb->aeroedge)&& (ob->softflag & OB_SB_EDGES));
@@ -2321,9 +2323,9 @@ static void softbody_calc_forces(Scene *scene, SceneLayer *sl, Object *ob, float
 		iks  = 1.0f/(1.0f-sb->inspring)-1.0f ;/* inner spring constants function */
 		/* bproot= sb->bpoint; */ /* need this for proper spring addressing */ /* UNUSED */
 
-		if (do_springcollision || do_aero)  scan_for_ext_spring_forces(scene, ob, timenow);
+		if (do_springcollision || do_aero)  scan_for_ext_spring_forces(eval_ctx, scene, ob, timenow);
 		/* after spring scan because it uses Effoctors too */
-		do_effector= pdInitEffectors(scene, ob, NULL, ob->soft->effector_weights, true);
+		do_effector= pdInitEffectors(eval_ctx, scene, ob, NULL, ob->soft->effector_weights, true);
 
 		if (do_deflector) {
 			float defforce[3];
@@ -3412,7 +3414,7 @@ static void softbody_update_positions(Object *ob, SoftBody *sb, float (*vertexCo
  * lloc, lrot, lscale are allowed to be NULL, just in case you don't need it.
  * should be pretty useful for pythoneers :)
  * not! velocity .. 2nd order stuff
- * vcloud_estimate_transform see
+ * vcloud_estimate_transform_v3 see
  */
 
 void SB_estimate_transform(Object *ob, float lloc[3], float lrot[3][3], float lscale[3][3])
@@ -3436,7 +3438,7 @@ void SB_estimate_transform(Object *ob, float lloc[3], float lrot[3][3], float ls
 		copy_v3_v3(opos[a], bp->pos);
 	}
 
-	vcloud_estimate_transform(sb->totpoint, opos, NULL, rpos, NULL, com, rcom, lrot, lscale);
+	vcloud_estimate_transform_v3(sb->totpoint, opos, NULL, rpos, NULL, com, rcom, lrot, lscale);
 	//sub_v3_v3(com, rcom);
 	if (lloc) copy_v3_v3(lloc, com);
 	copy_v3_v3(sb->lcom, com);
@@ -3510,7 +3512,7 @@ static void softbody_reset(Object *ob, SoftBody *sb, float (*vertexCos)[3], int
 	}
 }
 
-static void softbody_step(Scene *scene, SceneLayer *sl, Object *ob, SoftBody *sb, float dtime)
+static void softbody_step(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, SoftBody *sb, float dtime)
 {
 	/* the simulator */
 	float forcetime;
@@ -3524,11 +3526,11 @@ static void softbody_step(Scene *scene, SceneLayer *sl, Object *ob, SoftBody *sb
 	 */
 	if (dtime < 0 || dtime > 10.5f) return;
 
-	ccd_update_deflector_hash(sl, sb->collision_group, ob, sb->scratch->colliderhash);
+	ccd_update_deflector_hash(eval_ctx->scene_layer, sb->collision_group, ob, sb->scratch->colliderhash);
 
 	if (sb->scratch->needstobuildcollider) {
-		if (query_external_colliders(sl, sb->collision_group)) {
-			ccd_build_deflector_hash(sl, sb->collision_group, ob, sb->scratch->colliderhash);
+		if (query_external_colliders(eval_ctx->scene_layer, sb->collision_group)) {
+			ccd_build_deflector_hash(eval_ctx->scene_layer, sb->collision_group, ob, sb->scratch->colliderhash);
 		}
 		sb->scratch->needstobuildcollider=0;
 	}
@@ -3558,12 +3560,12 @@ static void softbody_step(Scene *scene, SceneLayer *sl, Object *ob, SoftBody *sb
 
 			sb->scratch->flag &= ~SBF_DOFUZZY;
 			/* do predictive euler step */
-			softbody_calc_forces(scene, sl, ob, forcetime, timedone/dtime);
+			softbody_calc_forces(eval_ctx, scene, ob, forcetime, timedone/dtime);
 
 			softbody_apply_forces(ob, forcetime, 1, NULL, mid_flags);
 
 			/* crop new slope values to do averaged slope step */
-			softbody_calc_forces(scene, sl, ob, forcetime, timedone/dtime);
+			softbody_calc_forces(eval_ctx, scene, ob, forcetime, timedone/dtime);
 
 			softbody_apply_forces(ob, forcetime, 2, &err, mid_flags);
 			softbody_apply_goalsnap(ob);
@@ -3644,7 +3646,7 @@ static void softbody_step(Scene *scene, SceneLayer *sl, Object *ob, SoftBody *sb
 }
 
 /* simulates one step. framenr is in frames */
-void sbObjectStep(Scene *scene, SceneLayer *sl, Object *ob, float cfra, float (*vertexCos)[3], int numVerts)
+void sbObjectStep(const struct EvaluationContext *eval_ctx, Scene *scene, Object *ob, float cfra, float (*vertexCos)[3], int numVerts)
 {
 	SoftBody *sb= ob->soft;
 	PointCache *cache;
@@ -3759,7 +3761,7 @@ void sbObjectStep(Scene *scene, SceneLayer *sl, Object *ob, float cfra, float (*
 	dtime = framedelta*timescale;
 
 	/* do simulation */
-	softbody_step(scene, sl, ob, sb, dtime);
+	softbody_step(eval_ctx, scene, ob, sb, dtime);
 
 	softbody_to_object(ob, vertexCos, numVerts, 0);
 
diff --git a/source/blender/blenkernel/intern/sound.c b/source/blender/blenkernel/intern/sound.c
index 8469351c54a..a2568707b0a 100644
--- a/source/blender/blenkernel/intern/sound.c
+++ b/source/blender/blenkernel/intern/sound.c
@@ -48,13 +48,11 @@
 #include "DNA_speaker_types.h"
 
 #ifdef WITH_AUDASPACE
-#  include AUD_SOUND_H
-#  include AUD_SEQUENCE_H
-#  include AUD_HANDLE_H
-#  include AUD_SPECIAL_H
-#  ifdef WITH_SYSTEM_AUDASPACE
-#    include "../../../intern/audaspace/intern/AUD_Set.h"
-#  endif
+#  include <AUD_Sound.h>
+#  include <AUD_Sequence.h>
+#  include <AUD_Handle.h>
+#  include <AUD_Special.h>
+#  include "../../../intern/audaspace/intern/AUD_Set.h"
 #endif
 
 #include "BKE_global.h"
@@ -83,7 +81,7 @@ bSound *BKE_sound_new_file(struct Main *bmain, const char *filepath)
 
 	BLI_path_abs(str, path);
 
-	sound = BKE_libblock_alloc(bmain, ID_SO, BLI_path_basename(filepath));
+	sound = BKE_libblock_alloc(bmain, ID_SO, BLI_path_basename(filepath), 0);
 	BLI_strncpy(sound->name, filepath, FILE_MAX);
 	/* sound->type = SOUND_TYPE_FILE; */ /* XXX unused currently */
 
@@ -155,6 +153,34 @@ void BKE_sound_free(bSound *sound)
 	}
 }
 
+/**
+ * Only copy internal data of Sound ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_sound_copy_data(Main *bmain, bSound *sound_dst, const bSound *UNUSED(sound_src), const int UNUSED(flag))
+{
+	sound_dst->handle = NULL;
+	sound_dst->cache = NULL;
+	sound_dst->waveform = NULL;
+	sound_dst->playback_handle = NULL;
+	sound_dst->spinlock = NULL;  /* Think this is OK? Otherwise, easy to create new spinlock here... */
+
+	/* Just to be sure, should not have any value actually after reading time. */
+	sound_dst->ipo = NULL;
+	sound_dst->newpackedfile = NULL;
+
+	if (sound_dst->packedfile) {
+		sound_dst->packedfile = dupPackedFile(sound_dst->packedfile);
+	}
+
+	/* Initialize whole runtime (audaspace) stuff. */
+	BKE_sound_load(bmain, sound_dst);
+}
+
 void BKE_sound_make_local(Main *bmain, bSound *sound, const bool lib_local)
 {
 	BKE_id_make_local_generic(bmain, &sound->id, true, lib_local);
@@ -200,7 +226,7 @@ void BKE_sound_init_once(void)
 	atexit(BKE_sound_exit_once);
 }
 
-static AUD_Device *sound_device;
+static AUD_Device *sound_device = NULL;
 
 void *BKE_sound_get_device(void)
 {
@@ -209,6 +235,9 @@ void *BKE_sound_get_device(void)
 
 void BKE_sound_init(struct Main *bmain)
 {
+	/* Make sure no instance of the sound system is running, otherwise we get leaks. */
+	BKE_sound_exit();
+
 	AUD_DeviceSpecs specs;
 	int device, buffersize;
 	const char *device_name;
@@ -274,7 +303,6 @@ void BKE_sound_exit_once(void)
 	sound_device = NULL;
 	AUD_exitOnce();
 
-#ifdef WITH_SYSTEM_AUDASPACE
 	if (audio_device_names != NULL) {
 		int i;
 		for (i = 0; audio_device_names[i]; i++) {
@@ -283,7 +311,6 @@ void BKE_sound_exit_once(void)
 		free(audio_device_names);
 		audio_device_names = NULL;
 	}
-#endif
 }
 
 /* XXX unused currently */
@@ -879,28 +906,12 @@ float BKE_sound_get_length(bSound *sound)
 char **BKE_sound_get_device_names(void)
 {
 	if (audio_device_names == NULL) {
-#ifdef WITH_SYSTEM_AUDASPACE
 		audio_device_names = AUD_getDeviceNames();
-#else
-		static const char *names[] = {
-			"Null", "SDL", "OpenAL", "JACK", NULL
-		};
-		audio_device_names = (char **)names;
-#endif
 	}
 
 	return audio_device_names;
 }
 
-bool BKE_sound_is_jack_supported(void)
-{
-#ifdef WITH_SYSTEM_AUDASPACE
-	return 1;
-#else
-	return (bool)AUD_isJackSupported();
-#endif
-}
-
 #else  /* WITH_AUDASPACE */
 
 #include "BLI_utildefines.h"
@@ -947,5 +958,6 @@ void BKE_sound_set_scene_sound_pan(void *UNUSED(handle), float UNUSED(pan), char
 void BKE_sound_set_scene_volume(struct Scene *UNUSED(scene), float UNUSED(volume)) {}
 void BKE_sound_set_scene_sound_pitch(void *UNUSED(handle), float UNUSED(pitch), char UNUSED(animated)) {}
 float BKE_sound_get_length(struct bSound *UNUSED(sound)) { return 0; }
-bool BKE_sound_is_jack_supported(void) { return false; }
+char **BKE_sound_get_device_names(void) { static char *names[1] = {NULL}; return names; }
+
 #endif  /* WITH_AUDASPACE */
diff --git a/source/blender/blenkernel/intern/speaker.c b/source/blender/blenkernel/intern/speaker.c
index d00e4b1a0d2..9d604a9382a 100644
--- a/source/blender/blenkernel/intern/speaker.c
+++ b/source/blender/blenkernel/intern/speaker.c
@@ -61,25 +61,31 @@ void *BKE_speaker_add(Main *bmain, const char *name)
 {
 	Speaker *spk;
 
-	spk =  BKE_libblock_alloc(bmain, ID_SPK, name);
+	spk =  BKE_libblock_alloc(bmain, ID_SPK, name, 0);
 
 	BKE_speaker_init(spk);
 
 	return spk;
 }
 
-Speaker *BKE_speaker_copy(Main *bmain, const Speaker *spk)
+/**
+ * Only copy internal data of Speaker ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_speaker_copy_data(Main *UNUSED(bmain), Speaker *UNUSED(spk_dst), const Speaker *UNUSED(spk_src), const int UNUSED(flag))
 {
-	Speaker *spkn;
-
-	spkn = BKE_libblock_copy(bmain, &spk->id);
-
-	if (spkn->sound)
-		id_us_plus(&spkn->sound->id);
-
-	BKE_id_copy_ensure_local(bmain, &spk->id, &spkn->id);
+	/* Nothing to do! */
+}
 
-	return spkn;
+Speaker *BKE_speaker_copy(Main *bmain, const Speaker *spk)
+{
+	Speaker *spk_copy;
+	BKE_id_copy_ex(bmain, &spk->id, (ID **)&spk_copy, 0, false);
+	return spk_copy;
 }
 
 void BKE_speaker_make_local(Main *bmain, Speaker *spk, const bool lib_local)
diff --git a/source/blender/blenkernel/intern/subsurf_ccg.c b/source/blender/blenkernel/intern/subsurf_ccg.c
index 1f72744bdee..d461e03fcda 100644
--- a/source/blender/blenkernel/intern/subsurf_ccg.c
+++ b/source/blender/blenkernel/intern/subsurf_ccg.c
@@ -42,6 +42,8 @@
 #include <math.h>
 #include <float.h>
 
+#include "atomic_ops.h"
+
 #include "MEM_guardedalloc.h"
 
 #include "DNA_mesh_types.h"
@@ -2197,12 +2199,12 @@ static void ccgDM_buffer_copy_color(
 		for (S = 0; S < numVerts; S++) {
 			for (y = 0; y < gridFaces; y++) {
 				for (x = 0; x < gridFaces; x++) {
-					copy_v3_v3_uchar(&varray[start + 0], &mloopcol[iface * 16 + 0]);
-					copy_v3_v3_uchar(&varray[start + 3], &mloopcol[iface * 16 + 12]);
-					copy_v3_v3_uchar(&varray[start + 6], &mloopcol[iface * 16 + 8]);
-					copy_v3_v3_uchar(&varray[start + 9], &mloopcol[iface * 16 + 4]);
+					copy_v4_v4_uchar(&varray[start + 0], &mloopcol[iface * 16 + 0]);
+					copy_v4_v4_uchar(&varray[start + 4], &mloopcol[iface * 16 + 12]);
+					copy_v4_v4_uchar(&varray[start + 8], &mloopcol[iface * 16 + 8]);
+					copy_v4_v4_uchar(&varray[start + 12], &mloopcol[iface * 16 + 4]);
 
-					start += 12;
+					start += 16;
 					iface++;
 				}
 			}
@@ -3427,6 +3429,11 @@ static void ccgDM_drawMappedFaces(DerivedMesh *dm,
 	int gridFaces = gridSize - 1, totface;
 	int prev_mat_nr = -1;
 
+	if (ccgdm->pbvh) {
+		if (G.debug_value == 14)
+			BKE_pbvh_draw_BB(ccgdm->pbvh);
+	}
+
 #ifdef WITH_OPENSUBDIV
 	if (ccgdm->useGpuBackend) {
 		int new_matnr;
@@ -3537,16 +3544,16 @@ static void ccgDM_drawMappedFaces(DerivedMesh *dm,
 								float *c = CCG_grid_elem_co(&key, faceGridData, x + 1, y + 1);
 								float *d = CCG_grid_elem_co(&key, faceGridData, x, y + 1);
 
-								if (cp) glColor3ubv(&cp[4]);
+								if (cp) glColor4ubv(&cp[4]);
 								glNormal3fv(ln[1]);
 								glVertex3fv(d);
-								if (cp) glColor3ubv(&cp[8]);
+								if (cp) glColor4ubv(&cp[8]);
 								glNormal3fv(ln[2]);
 								glVertex3fv(c);
-								if (cp) glColor3ubv(&cp[12]);
+								if (cp) glColor4ubv(&cp[12]);
 								glNormal3fv(ln[3]);
 								glVertex3fv(b);
-								if (cp) glColor3ubv(&cp[0]);
+								if (cp) glColor4ubv(&cp[0]);
 								glNormal3fv(ln[0]);
 								glVertex3fv(a);
 
@@ -3564,10 +3571,10 @@ static void ccgDM_drawMappedFaces(DerivedMesh *dm,
 								a = CCG_grid_elem(&key, faceGridData, x, y + 0);
 								b = CCG_grid_elem(&key, faceGridData, x, y + 1);
 	
-								if (cp) glColor3ubv(&cp[0]);
+								if (cp) glColor4ubv(&cp[0]);
 								glNormal3fv(CCG_elem_no(&key, a));
 								glVertex3fv(CCG_elem_co(&key, a));
-								if (cp) glColor3ubv(&cp[4]);
+								if (cp) glColor4ubv(&cp[4]);
 								glNormal3fv(CCG_elem_no(&key, b));
 								glVertex3fv(CCG_elem_co(&key, b));
 
@@ -3579,10 +3586,10 @@ static void ccgDM_drawMappedFaces(DerivedMesh *dm,
 							a = CCG_grid_elem(&key, faceGridData, x, y + 0);
 							b = CCG_grid_elem(&key, faceGridData, x, y + 1);
 
-							if (cp) glColor3ubv(&cp[12]);
+							if (cp) glColor4ubv(&cp[12]);
 							glNormal3fv(CCG_elem_no(&key, a));
 							glVertex3fv(CCG_elem_co(&key, a));
-							if (cp) glColor3ubv(&cp[8]);
+							if (cp) glColor4ubv(&cp[8]);
 							glNormal3fv(CCG_elem_no(&key, b));
 							glVertex3fv(CCG_elem_co(&key, b));
 
@@ -3602,13 +3609,13 @@ static void ccgDM_drawMappedFaces(DerivedMesh *dm,
 
 								ccgDM_glNormalFast(a, b, c, d);
 	
-								if (cp) glColor3ubv(&cp[4]);
+								if (cp) glColor4ubv(&cp[4]);
 								glVertex3fv(d);
-								if (cp) glColor3ubv(&cp[8]);
+								if (cp) glColor4ubv(&cp[8]);
 								glVertex3fv(c);
-								if (cp) glColor3ubv(&cp[12]);
+								if (cp) glColor4ubv(&cp[12]);
 								glVertex3fv(b);
-								if (cp) glColor3ubv(&cp[0]);
+								if (cp) glColor4ubv(&cp[0]);
 								glVertex3fv(a);
 
 								if (cp) cp += 16;
@@ -4160,7 +4167,8 @@ static struct PBVH *ccgDM_getPBVH(Object *ob, DerivedMesh *dm)
 	if (!ob->sculpt)
 		return NULL;
 
-	grid_pbvh = ccgDM_use_grid_pbvh(ccgdm);
+	/* In vwpaint, we always use a grid_pbvh for multires/subsurf */
+	grid_pbvh = (!(ob->mode & OB_MODE_SCULPT) || ccgDM_use_grid_pbvh(ccgdm));
 
 	if (ob->sculpt->pbvh) {
 		if (grid_pbvh) {
@@ -4176,12 +4184,18 @@ static struct PBVH *ccgDM_getPBVH(Object *ob, DerivedMesh *dm)
 		ccgdm->pbvh = ob->sculpt->pbvh;
 	}
 
-	if (ccgdm->pbvh)
+	if (ccgdm->pbvh) {
+		/* For vertex paint, keep track of ccgdm */
+		if (!(ob->mode & OB_MODE_SCULPT)) {
+			BKE_pbvh_set_ccgdm(ccgdm->pbvh, ccgdm);
+		}
 		return ccgdm->pbvh;
+	}
 
 	/* no pbvh exists yet, we need to create one. only in case of multires
 	 * we build a pbvh over the modified mesh, in other cases the base mesh
 	 * is being sculpted, so we build a pbvh from that. */
+	/* Note: vwpaint always builds a pbvh over the modified mesh. */
 	if (grid_pbvh) {
 		ccgdm_create_grids(dm);
 
@@ -4212,6 +4226,10 @@ static struct PBVH *ccgDM_getPBVH(Object *ob, DerivedMesh *dm)
 	if (ccgdm->pbvh)
 		pbvh_show_diffuse_color_set(ccgdm->pbvh, ob->sculpt->show_diffuse_color);
 
+	/* For vertex paint, keep track of ccgdm */
+	if (!(ob->mode & OB_MODE_SCULPT) && ccgdm->pbvh) {
+		BKE_pbvh_set_ccgdm(ccgdm->pbvh, ccgdm);
+	}
 	return ccgdm->pbvh;
 }
 
@@ -4220,16 +4238,17 @@ static void ccgDM_recalcTessellation(DerivedMesh *UNUSED(dm))
 	/* Nothing to do: CCG handles creating its own tessfaces */
 }
 
+/* WARNING! *MUST* be called in an 'loops_cache_rwlock' protected thread context! */
 static void ccgDM_recalcLoopTri(DerivedMesh *dm)
 {
-	BLI_rw_mutex_lock(&loops_cache_rwlock, THREAD_LOCK_WRITE);
-	MLoopTri *mlooptri;
+	MLoopTri *mlooptri = dm->looptris.array;
 	const int tottri = dm->numPolyData * 2;
 	int i, poly_index;
 
 	DM_ensure_looptri_data(dm);
-	mlooptri = dm->looptris.array;
+	mlooptri = dm->looptris.array_wip;
 
+	BLI_assert(tottri == 0 || mlooptri != NULL);
 	BLI_assert(poly_to_tri_count(dm->numPolyData, dm->numLoopData) == dm->looptris.num);
 	BLI_assert(tottri == dm->looptris.num);
 
@@ -4248,19 +4267,10 @@ static void ccgDM_recalcLoopTri(DerivedMesh *dm)
 		lt->tri[2] = (poly_index * 4) + 2;
 		lt->poly = poly_index;
 	}
-	BLI_rw_mutex_unlock(&loops_cache_rwlock);
-}
-
-static const MLoopTri *ccgDM_getLoopTriArray(DerivedMesh *dm)
-{
-	if (dm->looptris.array) {
-		BLI_assert(poly_to_tri_count(dm->numPolyData, dm->numLoopData) == dm->looptris.num);
-	}
-	else {
-		dm->recalcLoopTri(dm);
-	}
 
-	return dm->looptris.array;
+	BLI_assert(dm->looptris.array == NULL);
+	atomic_cas_ptr((void **)&dm->looptris.array, dm->looptris.array, dm->looptris.array_wip);
+	dm->looptris.array_wip = NULL;
 }
 
 static void ccgDM_calcNormals(DerivedMesh *dm)
@@ -4279,8 +4289,6 @@ static void set_default_ccgdm_callbacks(CCGDerivedMesh *ccgdm)
 	ccgdm->dm.getNumPolys = ccgDM_getNumPolys;
 	ccgdm->dm.getNumTessFaces = ccgDM_getNumTessFaces;
 
-	ccgdm->dm.getLoopTriArray = ccgDM_getLoopTriArray;
-
 	ccgdm->dm.getVert = ccgDM_getFinalVert;
 	ccgdm->dm.getEdge = ccgDM_getFinalEdge;
 	ccgdm->dm.getTessFace = ccgDM_getFinalFace;
diff --git a/source/blender/blenkernel/intern/text.c b/source/blender/blenkernel/intern/text.c
index 9444e605e6d..4ae9818f891 100644
--- a/source/blender/blenkernel/intern/text.c
+++ b/source/blender/blenkernel/intern/text.c
@@ -223,7 +223,7 @@ Text *BKE_text_add(Main *bmain, const char *name)
 {
 	Text *ta;
 
-	ta = BKE_libblock_alloc(bmain, ID_TXT, name);
+	ta = BKE_libblock_alloc(bmain, ID_TXT, name, 0);
 
 	BKE_text_init(ta);
 
@@ -409,7 +409,7 @@ Text *BKE_text_load_ex(Main *bmain, const char *file, const char *relpath, const
 		return false;
 	}
 
-	ta = BKE_libblock_alloc(bmain, ID_TXT, BLI_path_basename(filepath_abs));
+	ta = BKE_libblock_alloc(bmain, ID_TXT, BLI_path_basename(filepath_abs), 0);
 	ta->id.us = 0;
 
 	BLI_listbase_clear(&ta->lines);
@@ -448,53 +448,49 @@ Text *BKE_text_load(Main *bmain, const char *file, const char *relpath)
 	return BKE_text_load_ex(bmain, file, relpath, false);
 }
 
-Text *BKE_text_copy(Main *bmain, const Text *ta)
+/**
+ * Only copy internal data of Text ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_text_copy_data(Main *UNUSED(bmain), Text *ta_dst, const Text *ta_src, const int UNUSED(flag))
 {
-	Text *tan;
-	TextLine *line, *tmp;
-	
-	tan = BKE_libblock_copy(bmain, &ta->id);
-	
 	/* file name can be NULL */
-	if (ta->name) {
-		tan->name = BLI_strdup(ta->name);
-	}
-	else {
-		tan->name = NULL;
+	if (ta_src->name) {
+		ta_dst->name = BLI_strdup(ta_src->name);
 	}
 
-	tan->flags = ta->flags | TXT_ISDIRTY;
-	
-	BLI_listbase_clear(&tan->lines);
-	tan->curl = tan->sell = NULL;
-	tan->compiled = NULL;
-	
-	tan->nlines = ta->nlines;
+	ta_dst->flags |= TXT_ISDIRTY;
+
+	BLI_listbase_clear(&ta_dst->lines);
+	ta_dst->curl = ta_dst->sell = NULL;
+	ta_dst->compiled = NULL;
 
-	line = ta->lines.first;
 	/* Walk down, reconstructing */
-	while (line) {
-		tmp = (TextLine *) MEM_mallocN(sizeof(TextLine), "textline");
-		tmp->line = MEM_mallocN(line->len + 1, "textline_string");
-		tmp->format = NULL;
-		
-		strcpy(tmp->line, line->line);
+	for (TextLine *line_src = ta_src->lines.first; line_src; line_src = line_src->next) {
+		TextLine *line_dst = MEM_mallocN(sizeof(*line_dst), __func__);
 
-		tmp->len = line->len;
-		
-		BLI_addtail(&tan->lines, tmp);
-		
-		line = line->next;
-	}
+		line_dst->line = BLI_strdup(line_src->line);
+		line_dst->format = NULL;
+		line_dst->len = line_src->len;
 
-	tan->curl = tan->sell = tan->lines.first;
-	tan->curc = tan->selc = 0;
+		BLI_addtail(&ta_dst->lines, line_dst);
+	}
 
-	init_undo_text(tan);
+	ta_dst->curl = ta_dst->sell = ta_dst->lines.first;
+	ta_dst->curc = ta_dst->selc = 0;
 
-	BKE_id_copy_ensure_local(bmain, &ta->id, &tan->id);
+	init_undo_text(ta_dst);
+}
 
-	return tan;
+Text *BKE_text_copy(Main *bmain, const Text *ta)
+{
+	Text *ta_copy;
+	BKE_id_copy_ex(bmain, &ta->id, (ID **)&ta_copy, 0, false);
+	return ta_copy;
 }
 
 void BKE_text_make_local(Main *bmain, Text *text, const bool lib_local)
diff --git a/source/blender/blenkernel/intern/texture.c b/source/blender/blenkernel/intern/texture.c
index 1e0659d3d67..8f0334a4752 100644
--- a/source/blender/blenkernel/intern/texture.c
+++ b/source/blender/blenkernel/intern/texture.c
@@ -707,7 +707,7 @@ Tex *BKE_texture_add(Main *bmain, const char *name)
 {
 	Tex *tex;
 
-	tex = BKE_libblock_alloc(bmain, ID_TE, name);
+	tex = BKE_libblock_alloc(bmain, ID_TE, name, 0);
 	
 	BKE_texture_default(tex);
 	
@@ -846,41 +846,71 @@ MTex *BKE_texture_mtex_add_id(ID *id, int slot)
 
 /* ------------------------------------------------------------------------- */
 
-Tex *BKE_texture_copy(Main *bmain, const Tex *tex)
+/**
+ * Only copy internal data of Texture ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_texture_copy_data(Main *bmain, Tex *tex_dst, const Tex *tex_src, const int flag)
 {
-	Tex *texn;
-	
-	texn = BKE_libblock_copy(bmain, &tex->id);
-	if (BKE_texture_is_image_user(tex)) {
-		id_us_plus((ID *)texn->ima);
+	/* We never handle usercount here for own data. */
+	const int flag_subdata = flag | LIB_ID_CREATE_NO_USER_REFCOUNT;
+
+	if (!BKE_texture_is_image_user(tex_src)) {
+		tex_dst->ima = NULL;
 	}
-	else {
-		texn->ima = NULL;
+
+	if (tex_dst->coba) {
+		tex_dst->coba = MEM_dupallocN(tex_dst->coba);
+	}
+	if (tex_dst->env) {
+		tex_dst->env = BKE_texture_envmap_copy(tex_dst->env, flag_subdata);
+	}
+	if (tex_dst->pd) {
+		tex_dst->pd = BKE_texture_pointdensity_copy(tex_dst->pd, flag_subdata);
+	}
+	if (tex_dst->vd) {
+		tex_dst->vd = MEM_dupallocN(tex_dst->vd);
+	}
+	if (tex_dst->ot) {
+		tex_dst->ot = BKE_texture_ocean_copy(tex_dst->ot, flag_subdata);
 	}
-	
-	if (texn->coba) texn->coba = MEM_dupallocN(texn->coba);
-	if (texn->env) texn->env = BKE_texture_envmap_copy(texn->env);
-	if (texn->pd) texn->pd = BKE_texture_pointdensity_copy(texn->pd);
-	if (texn->vd) texn->vd = MEM_dupallocN(texn->vd);
-	if (texn->ot) texn->ot = BKE_texture_ocean_copy(texn->ot);
 
-	if (tex->nodetree) {
-		if (tex->nodetree->execdata) {
-			ntreeTexEndExecTree(tex->nodetree->execdata);
+	if (tex_src->nodetree) {
+		if (tex_src->nodetree->execdata) {
+			ntreeTexEndExecTree(tex_src->nodetree->execdata);
 		}
-		texn->nodetree = ntreeCopyTree(bmain, tex->nodetree);
+		BKE_id_copy_ex(bmain, (ID *)tex_src->nodetree, (ID **)&tex_dst->nodetree, flag, false);
 	}
 
-	BKE_previewimg_id_copy(&texn->id, &tex->id);
-
-	BKE_id_copy_ensure_local(bmain, &tex->id, &texn->id);
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
+		BKE_previewimg_id_copy(&tex_dst->id, &tex_src->id);
+	}
+	else {
+		tex_dst->preview = NULL;
+	}
+}
 
-	return texn;
+Tex *BKE_texture_copy(Main *bmain, const Tex *tex)
+{
+	Tex *tex_copy;
+	BKE_id_copy_ex(bmain, &tex->id, (ID **)&tex_copy, 0, false);
+	return tex_copy;
 }
 
 /* texture copy without adding to main dbase */
 Tex *BKE_texture_localize(Tex *tex)
 {
+	/* TODO replace with something like
+	 * 	Tex *tex_copy;
+	 * 	BKE_id_copy_ex(bmain, &tex->id, (ID **)&tex_copy, LIB_ID_COPY_NO_MAIN | LIB_ID_COPY_NO_PREVIEW | LIB_ID_COPY_NO_USER_REFCOUNT, false);
+	 * 	return tex_copy;
+	 *
+	 * ... Once f*** nodes are fully converted to that too :( */
+
 	Tex *texn;
 	
 	texn = BKE_libblock_copy_nolib(&tex->id, false);
@@ -889,17 +919,17 @@ Tex *BKE_texture_localize(Tex *tex)
 	
 	if (texn->coba) texn->coba = MEM_dupallocN(texn->coba);
 	if (texn->env) {
-		texn->env = BKE_texture_envmap_copy(texn->env);
+		texn->env = BKE_texture_envmap_copy(texn->env, LIB_ID_CREATE_NO_USER_REFCOUNT);
 		id_us_min(&texn->env->ima->id);
 	}
-	if (texn->pd) texn->pd = BKE_texture_pointdensity_copy(texn->pd);
+	if (texn->pd) texn->pd = BKE_texture_pointdensity_copy(texn->pd, LIB_ID_CREATE_NO_USER_REFCOUNT);
 	if (texn->vd) {
 		texn->vd = MEM_dupallocN(texn->vd);
 		if (texn->vd->dataset)
 			texn->vd->dataset = MEM_dupallocN(texn->vd->dataset);
 	}
 	if (texn->ot) {
-		texn->ot = BKE_texture_ocean_copy(tex->ot);
+		texn->ot = BKE_texture_ocean_copy(tex->ot, LIB_ID_CREATE_NO_USER_REFCOUNT);
 	}
 	
 	texn->preview = NULL;
@@ -1099,6 +1129,8 @@ void set_active_mtex(ID *id, short act)
 		case ID_PA:
 			((ParticleSettings *)id)->texact = act;
 			break;
+		default:
+			break;
 	}
 }
 
@@ -1263,16 +1295,20 @@ EnvMap *BKE_texture_envmap_add(void)
 
 /* ------------------------------------------------------------------------- */
 
-EnvMap *BKE_texture_envmap_copy(const EnvMap *env)
+EnvMap *BKE_texture_envmap_copy(const EnvMap *env, const int flag)
 {
 	EnvMap *envn;
 	int a;
 	
 	envn = MEM_dupallocN(env);
 	envn->ok = 0;
-	for (a = 0; a < 6; a++) envn->cube[a] = NULL;
-	if (envn->ima) id_us_plus((ID *)envn->ima);
-	
+	for (a = 0; a < 6; a++) {
+		envn->cube[a] = NULL;
+	}
+	if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+		id_us_plus((ID *)envn->ima);
+	}
+
 	return envn;
 }
 
@@ -1336,14 +1372,16 @@ PointDensity *BKE_texture_pointdensity_add(void)
 	return pd;
 } 
 
-PointDensity *BKE_texture_pointdensity_copy(const PointDensity *pd)
+PointDensity *BKE_texture_pointdensity_copy(const PointDensity *pd, const int UNUSED(flag))
 {
 	PointDensity *pdn;
 
 	pdn = MEM_dupallocN(pd);
 	pdn->point_tree = NULL;
 	pdn->point_data = NULL;
-	if (pdn->coba) pdn->coba = MEM_dupallocN(pdn->coba);
+	if (pdn->coba) {
+		pdn->coba = MEM_dupallocN(pdn->coba);
+	}
 	pdn->falloff_curve = curvemapping_copy(pdn->falloff_curve); /* can be NULL */
 	return pdn;
 }
@@ -1430,7 +1468,7 @@ OceanTex *BKE_texture_ocean_add(void)
 	return ot;
 }
 
-OceanTex *BKE_texture_ocean_copy(const OceanTex *ot)
+OceanTex *BKE_texture_ocean_copy(const OceanTex *ot, const int UNUSED(flag))
 {
 	OceanTex *otn = MEM_dupallocN(ot);
 	
diff --git a/source/blender/blenkernel/intern/tracking.c b/source/blender/blenkernel/intern/tracking.c
index 9120d384a16..b4ef381534f 100644
--- a/source/blender/blenkernel/intern/tracking.c
+++ b/source/blender/blenkernel/intern/tracking.c
@@ -190,7 +190,7 @@ void BKE_tracking_free(MovieTracking *tracking)
 }
 
 /* Copy the whole list of tracks. */
-static void tracking_tracks_copy(ListBase *tracks_dst, const ListBase *tracks_src, GHash *tracks_mapping)
+static void tracking_tracks_copy(ListBase *tracks_dst, const ListBase *tracks_src, GHash *tracks_mapping, const int flag)
 {
 	MovieTrackingTrack *track_dst, *track_src;
 
@@ -202,7 +202,9 @@ static void tracking_tracks_copy(ListBase *tracks_dst, const ListBase *tracks_sr
 		if (track_src->markers) {
 			track_dst->markers = MEM_dupallocN(track_src->markers);
 		}
-		id_us_plus(&track_dst->gpd->id);
+		if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+			id_us_plus(&track_dst->gpd->id);
+		}
 		BLI_addtail(tracks_dst, track_dst);
 		BLI_ghash_insert(tracks_mapping, track_src, track_dst);
 	}
@@ -210,7 +212,8 @@ static void tracking_tracks_copy(ListBase *tracks_dst, const ListBase *tracks_sr
 
 /* copy the whole list of plane tracks (need whole MovieTracking structures due to embedded pointers to tracks).
  * WARNING: implies tracking_[dst/src] and their tracks have already been copied. */
-static void tracking_plane_tracks_copy(ListBase *plane_tracks_dst, const ListBase *plane_tracks_src, GHash *tracks_mapping)
+static void tracking_plane_tracks_copy(
+        ListBase *plane_tracks_dst, const ListBase *plane_tracks_src, GHash *tracks_mapping, const int flag)
 {
 	MovieTrackingPlaneTrack *plane_track_dst, *plane_track_src;
 
@@ -225,14 +228,17 @@ static void tracking_plane_tracks_copy(ListBase *plane_tracks_dst, const ListBas
 		for (int i = 0; i < plane_track_dst->point_tracksnr; i++) {
 			plane_track_dst->point_tracks[i] = BLI_ghash_lookup(tracks_mapping, plane_track_src->point_tracks[i]);
 		}
-		id_us_plus(&plane_track_dst->image->id);
+		if ((flag & LIB_ID_CREATE_NO_USER_REFCOUNT) == 0) {
+			id_us_plus(&plane_track_dst->image->id);
+		}
 		BLI_addtail(plane_tracks_dst, plane_track_dst);
 	}
 }
 
 /* Copy reconstruction structure. */
 static void tracking_reconstruction_copy(
-        MovieTrackingReconstruction *reconstruction_dst, const MovieTrackingReconstruction *reconstruction_src)
+        MovieTrackingReconstruction *reconstruction_dst, const MovieTrackingReconstruction *reconstruction_src,
+        const int UNUSED(flag))
 {
 	*reconstruction_dst = *reconstruction_src;
 	if (reconstruction_src->cameras) {
@@ -242,23 +248,25 @@ static void tracking_reconstruction_copy(
 
 /* Copy stabilization structure. */
 static void tracking_stabilization_copy(
-        MovieTrackingStabilization *stabilization_dst, const MovieTrackingStabilization *stabilization_src)
+        MovieTrackingStabilization *stabilization_dst, const MovieTrackingStabilization *stabilization_src,
+        const int UNUSED(flag))
 {
 	*stabilization_dst = *stabilization_src;
 }
 
 /* Copy tracking object. */
 static void tracking_object_copy(
-        MovieTrackingObject *object_dst, const MovieTrackingObject *object_src, GHash *tracks_mapping)
+        MovieTrackingObject *object_dst, const MovieTrackingObject *object_src, GHash *tracks_mapping, const int flag)
 {
 	*object_dst = *object_src;
-	tracking_tracks_copy(&object_dst->tracks, &object_src->tracks, tracks_mapping);
-	tracking_plane_tracks_copy(&object_dst->plane_tracks, &object_src->plane_tracks, tracks_mapping);
-	tracking_reconstruction_copy(&object_dst->reconstruction, &object_src->reconstruction);
+	tracking_tracks_copy(&object_dst->tracks, &object_src->tracks, tracks_mapping, flag);
+	tracking_plane_tracks_copy(&object_dst->plane_tracks, &object_src->plane_tracks, tracks_mapping, flag);
+	tracking_reconstruction_copy(&object_dst->reconstruction, &object_src->reconstruction, flag);
 }
 
 /* Copy list of tracking objects. */
-static void tracking_objects_copy(ListBase *objects_dst, const ListBase *objects_src, GHash *tracks_mapping)
+static void tracking_objects_copy(
+        ListBase *objects_dst, const ListBase *objects_src, GHash *tracks_mapping, const int flag)
 {
 	MovieTrackingObject *object_dst, *object_src;
 
@@ -266,22 +274,22 @@ static void tracking_objects_copy(ListBase *objects_dst, const ListBase *objects
 
 	for (object_src = objects_src->first; object_src != NULL; object_src = object_src->next) {
 		object_dst = MEM_mallocN(sizeof(*object_dst), __func__);
-		tracking_object_copy(object_dst, object_src, tracks_mapping);
+		tracking_object_copy(object_dst, object_src, tracks_mapping, flag);
 		BLI_addtail(objects_dst, object_dst);
 	}
 }
 
 /* Copy tracking structure content. */
-void BKE_tracking_copy(MovieTracking *tracking_dst, const MovieTracking *tracking_src)
+void BKE_tracking_copy(MovieTracking *tracking_dst, const MovieTracking *tracking_src, const int flag)
 {
 	GHash *tracks_mapping = BLI_ghash_ptr_new(__func__);
 
 	*tracking_dst = *tracking_src;
 
-	tracking_tracks_copy(&tracking_dst->tracks, &tracking_src->tracks, tracks_mapping);
-	tracking_plane_tracks_copy(&tracking_dst->plane_tracks, &tracking_src->plane_tracks, tracks_mapping);
-	tracking_reconstruction_copy(&tracking_dst->reconstruction, &tracking_src->reconstruction);
-	tracking_stabilization_copy(&tracking_dst->stabilization, &tracking_src->stabilization);
+	tracking_tracks_copy(&tracking_dst->tracks, &tracking_src->tracks, tracks_mapping, flag);
+	tracking_plane_tracks_copy(&tracking_dst->plane_tracks, &tracking_src->plane_tracks, tracks_mapping, flag);
+	tracking_reconstruction_copy(&tracking_dst->reconstruction, &tracking_src->reconstruction, flag);
+	tracking_stabilization_copy(&tracking_dst->stabilization, &tracking_src->stabilization, flag);
 	if (tracking_src->act_track) {
 		tracking_dst->act_track = BLI_ghash_lookup(tracks_mapping, tracking_src->act_track);
 	}
@@ -299,7 +307,7 @@ void BKE_tracking_copy(MovieTracking *tracking_dst, const MovieTracking *trackin
 	}
 
 	/* Warning! Will override tracks_mapping. */
-	tracking_objects_copy(&tracking_dst->objects, &tracking_src->objects, tracks_mapping);
+	tracking_objects_copy(&tracking_dst->objects, &tracking_src->objects, tracks_mapping, flag);
 
 	/* Those remaining are runtime data, they will be reconstructed as needed, do not bother copying them. */
 	tracking_dst->dopesheet.ok = false;
diff --git a/source/blender/blenkernel/intern/tracking_auto.c b/source/blender/blenkernel/intern/tracking_auto.c
index 9475925cdda..30981ed8f23 100644
--- a/source/blender/blenkernel/intern/tracking_auto.c
+++ b/source/blender/blenkernel/intern/tracking_auto.c
@@ -312,7 +312,7 @@ AutoTrackContext *BKE_autotrack_context_new(MovieClip *clip,
 
 	int num_total_tracks = BLI_listbase_count(tracksbase);
 	context->tracks =
-		MEM_callocN(sizeof(MovieTrackingTrack*) * num_total_tracks,
+		MEM_callocN(sizeof(MovieTrackingTrack *) * num_total_tracks,
 		            "auto track pointers");
 
 	context->image_accessor =
@@ -381,7 +381,7 @@ AutoTrackContext *BKE_autotrack_context_new(MovieClip *clip,
 
 bool BKE_autotrack_context_step(AutoTrackContext *context)
 {
-	int frame_delta = context->backwards ? -1 : 1;
+	const int frame_delta = context->backwards ? -1 : 1;
 	bool ok = false;
 	int track;
 
@@ -395,67 +395,64 @@ bool BKE_autotrack_context_step(AutoTrackContext *context)
 		             libmv_reference_marker,
 		             libmv_tracked_marker;
 		libmv_TrackRegionResult libmv_result;
-		int frame = BKE_movieclip_remap_scene_to_clip_frame(
-			context->clips[options->clip_index],
-			context->user.framenr);
-		bool has_marker;
-
+		const int frame = BKE_movieclip_remap_scene_to_clip_frame(
+		        context->clips[options->clip_index],
+		        context->user.framenr);
 		BLI_spin_lock(&context->spin_lock);
-		has_marker = libmv_autoTrackGetMarker(context->autotrack,
-		                                      options->clip_index,
-		                                      frame,
-		                                      options->track_index,
-		                                      &libmv_current_marker);
+		const bool has_marker = libmv_autoTrackGetMarker(context->autotrack,
+		                                                 options->clip_index,
+		                                                 frame,
+		                                                 options->track_index,
+		                                                 &libmv_current_marker);
 		BLI_spin_unlock(&context->spin_lock);
-
-		if (has_marker) {
-			if (!tracking_check_marker_margin(&libmv_current_marker,
-			                                  options->track->margin,
-			                                  context->frame_width,
-			                                  context->frame_height))
-			{
-				continue;
-			}
-
-			libmv_tracked_marker = libmv_current_marker;
-			libmv_tracked_marker.frame = frame + frame_delta;
-
-			if (options->use_keyframe_match) {
-				libmv_tracked_marker.reference_frame =
-					libmv_current_marker.reference_frame;
-				libmv_autoTrackGetMarker(context->autotrack,
-			                             options->clip_index,
-			                             libmv_tracked_marker.reference_frame,
-			                             options->track_index,
-			                             &libmv_reference_marker);
-			}
-			else {
-				libmv_tracked_marker.reference_frame = frame;
-				libmv_reference_marker = libmv_current_marker;
-			}
-
-			if (libmv_autoTrackMarker(context->autotrack,
-			                          &options->track_region_options,
-			                          &libmv_tracked_marker,
-			                          &libmv_result))
-			{
-				BLI_spin_lock(&context->spin_lock);
-				libmv_autoTrackAddMarker(context->autotrack,
-				                         &libmv_tracked_marker);
-				BLI_spin_unlock(&context->spin_lock);
-			}
-			else {
-				options->is_failed = true;
-				options->failed_frame = frame + frame_delta;
-			}
-			ok = true;
+		/* Check whether we've got marker to sync with. */
+		if (!has_marker) {
+			continue;
+		}
+		/* Check whether marker is going outside of allowed frame margin. */
+		if (!tracking_check_marker_margin(&libmv_current_marker,
+		                                  options->track->margin,
+		                                  context->frame_width,
+		                                  context->frame_height))
+		{
+			continue;
+		}
+		libmv_tracked_marker = libmv_current_marker;
+		libmv_tracked_marker.frame = frame + frame_delta;
+		/* Update reference frame. */
+		if (options->use_keyframe_match) {
+			libmv_tracked_marker.reference_frame =
+			        libmv_current_marker.reference_frame;
+			libmv_autoTrackGetMarker(context->autotrack,
+		                             options->clip_index,
+		                             libmv_tracked_marker.reference_frame,
+		                             options->track_index,
+		                             &libmv_reference_marker);
 		}
+		else {
+			libmv_tracked_marker.reference_frame = frame;
+			libmv_reference_marker = libmv_current_marker;
+		}
+		/* Perform actual tracking. */
+		if (libmv_autoTrackMarker(context->autotrack,
+		                          &options->track_region_options,
+		                          &libmv_tracked_marker,
+		                          &libmv_result))
+		{
+			BLI_spin_lock(&context->spin_lock);
+			libmv_autoTrackAddMarker(context->autotrack, &libmv_tracked_marker);
+			BLI_spin_unlock(&context->spin_lock);
+		}
+		else {
+			options->is_failed = true;
+			options->failed_frame = frame + frame_delta;
+		}
+		ok = true;
 	}
-
+	/* Advance the frame. */
 	BLI_spin_lock(&context->spin_lock);
 	context->user.framenr += frame_delta;
 	BLI_spin_unlock(&context->spin_lock);
-
 	return ok;
 }
 
diff --git a/source/blender/blenkernel/intern/tracking_util.c b/source/blender/blenkernel/intern/tracking_util.c
index a95399562d5..d8e98291117 100644
--- a/source/blender/blenkernel/intern/tracking_util.c
+++ b/source/blender/blenkernel/intern/tracking_util.c
@@ -58,6 +58,15 @@
 
 #include "libmv-capi.h"
 
+/* Uncomment this to have caching-specific debug prints. */
+// #define DEBUG_CACHE
+
+#ifdef DEBUG_CACHE
+#  define CACHE_PRINTF(...) printf(__VA_ARGS__)
+#else
+#  define CACHE_PRINTF(...)
+#endif
+
 /*********************** Tracks map *************************/
 
 TracksMap *tracks_map_new(const char *object_name, bool is_camera, int num_tracks, int customdata_size)
@@ -523,6 +532,8 @@ typedef struct AccessCacheKey {
 	int frame;
 	int downscale;
 	libmv_InputMode input_mode;
+	bool has_region;
+	float region_min[2], region_max[2];
 	int64_t transform_key;
 } AccessCacheKey;
 
@@ -537,23 +548,44 @@ static bool accesscache_hashcmp(const void *a_v, const void *b_v)
 {
 	const AccessCacheKey *a = (const AccessCacheKey *) a_v;
 	const AccessCacheKey *b = (const AccessCacheKey *) b_v;
-
-#define COMPARE_FIELD(field)
-	{ \
-		if (a->clip_index != b->clip_index) { \
-			return false; \
-		} \
-	} (void) 0
-
-	COMPARE_FIELD(clip_index);
-	COMPARE_FIELD(frame);
-	COMPARE_FIELD(downscale);
-	COMPARE_FIELD(input_mode);
-	COMPARE_FIELD(transform_key);
-
-#undef COMPARE_FIELD
-
-	return true;
+	if (a->clip_index != b->clip_index ||
+	    a->frame != b->frame ||
+	    a->downscale != b->downscale ||
+	    a->input_mode != b->input_mode ||
+	    a->has_region != b->has_region ||
+	    a->transform_key != b->transform_key)
+	{
+		return true;
+	}
+	/* If there is region applied, compare it. */
+	if (a->has_region) {
+		if (!equals_v2v2(a->region_min, b->region_min) ||
+		    !equals_v2v2(a->region_max, b->region_max))
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+static void accesscache_construct_key(AccessCacheKey *key,
+                                      int clip_index,
+                                      int frame,
+                                      libmv_InputMode input_mode,
+                                      int downscale,
+                                      const libmv_Region *region,
+                                      int64_t transform_key)
+{
+	key->clip_index = clip_index;
+	key->frame = frame;
+	key->input_mode = input_mode;
+	key->downscale = downscale;
+	key->has_region = (region != NULL);
+	if (key->has_region) {
+		copy_v2_v2(key->region_min, region->min);
+		copy_v2_v2(key->region_max, region->max);
+	}
+	key->transform_key = transform_key;
 }
 
 static void accesscache_put(TrackingImageAccessor *accessor,
@@ -561,15 +593,13 @@ static void accesscache_put(TrackingImageAccessor *accessor,
                             int frame,
                             libmv_InputMode input_mode,
                             int downscale,
+                            const libmv_Region *region,
                             int64_t transform_key,
                             ImBuf *ibuf)
 {
 	AccessCacheKey key;
-	key.clip_index = clip_index;
-	key.frame = frame;
-	key.input_mode = input_mode;
-	key.downscale = downscale;
-	key.transform_key = transform_key;
+	accesscache_construct_key(&key, clip_index, frame, input_mode, downscale,
+	                          region, transform_key);
 	IMB_moviecache_put(accessor->cache, &key, ibuf);
 }
 
@@ -578,14 +608,12 @@ static ImBuf *accesscache_get(TrackingImageAccessor *accessor,
                               int frame,
                               libmv_InputMode input_mode,
                               int downscale,
+                              const libmv_Region *region,
                               int64_t transform_key)
 {
 	AccessCacheKey key;
-	key.clip_index = clip_index;
-	key.frame = frame;
-	key.input_mode = input_mode;
-	key.downscale = downscale;
-	key.transform_key = transform_key;
+	accesscache_construct_key(&key, clip_index, frame, input_mode, downscale,
+	                          region, transform_key);
 	return IMB_moviecache_get(accessor->cache, &key);
 }
 
@@ -674,29 +702,37 @@ static ImBuf *accessor_get_ibuf(TrackingImageAccessor *accessor,
 {
 	ImBuf *ibuf, *orig_ibuf, *final_ibuf;
 	int64_t transform_key = 0;
-
 	if (transform != NULL) {
 		transform_key = libmv_frameAccessorgetTransformKey(transform);
 	}
-
 	/* First try to get fully processed image from the cache. */
+	BLI_spin_lock(&accessor->cache_lock);
 	ibuf = accesscache_get(accessor,
 	                       clip_index,
 	                       frame,
 	                       input_mode,
 	                       downscale,
+	                       region,
 	                       transform_key);
+	BLI_spin_unlock(&accessor->cache_lock);
 	if (ibuf != NULL) {
+		CACHE_PRINTF("Used cached buffer for frame %d\n", frame);
+		/* This is a little heuristic here: if we re-used image once, this is
+		 * a high probability of the image to be related to a keyframe matched
+		 * reference image. Those images we don't want to be thrown away because
+		 * if we toss them out we'll be re-calculating them at the next
+		 * iteration.
+		 */
+		ibuf->userflags |= IB_PERSISTENT;
 		return ibuf;
 	}
-
+	CACHE_PRINTF("Calculate new buffer for frame %d\n", frame);
 	/* And now we do postprocessing of the original frame. */
 	orig_ibuf = accessor_get_preprocessed_ibuf(accessor, clip_index, frame);
-
 	if (orig_ibuf == NULL) {
 		return NULL;
 	}
-
+	/* Cut a region if requested. */
 	if (region != NULL) {
 		int width = region->max[0] - region->min[0],
 		    height = region->max[1] - region->min[1];
@@ -756,7 +792,7 @@ static ImBuf *accessor_get_ibuf(TrackingImageAccessor *accessor,
 		BLI_unlock_thread(LOCK_MOVIECLIP);
 		final_ibuf = orig_ibuf;
 	}
-
+	/* Downscale if needed. */
 	if (downscale > 0) {
 		if (final_ibuf == orig_ibuf) {
 			final_ibuf = IMB_dupImBuf(orig_ibuf);
@@ -765,7 +801,7 @@ static ImBuf *accessor_get_ibuf(TrackingImageAccessor *accessor,
 		               orig_ibuf->x / (1 << downscale),
 		               orig_ibuf->y / (1 << downscale));
 	}
-
+	/* Apply possible transformation. */
 	if (transform != NULL) {
 		libmv_FloatImage input_image, output_image;
 		ibuf_to_float_image(final_ibuf, &input_image);
@@ -778,12 +814,13 @@ static ImBuf *accessor_get_ibuf(TrackingImageAccessor *accessor,
 		final_ibuf = float_image_to_ibuf(&output_image);
 		libmv_floatImageDestroy(&output_image);
 	}
-
+	/* Transform number of channels. */
 	if (input_mode == LIBMV_IMAGE_MODE_RGBA) {
 		BLI_assert(orig_ibuf->channels == 3 || orig_ibuf->channels == 4);
 		/* pass */
 	}
 	else /* if (input_mode == LIBMV_IMAGE_MODE_MONO) */ {
+		BLI_assert(input_mode == LIBMV_IMAGE_MODE_MONO);
 		if (final_ibuf->channels != 1) {
 			ImBuf *grayscale_ibuf = make_grayscale_ibuf_copy(final_ibuf);
 			if (final_ibuf != orig_ibuf) {
@@ -793,37 +830,25 @@ static ImBuf *accessor_get_ibuf(TrackingImageAccessor *accessor,
 			final_ibuf = grayscale_ibuf;
 		}
 	}
-
-	/* it's possible processing still didn't happen at this point,
+	/* It's possible processing still didn't happen at this point,
 	 * but we really need a copy of the buffer to be transformed
 	 * and to be put to the cache.
 	 */
 	if (final_ibuf == orig_ibuf) {
 		final_ibuf = IMB_dupImBuf(orig_ibuf);
 	}
-
 	IMB_freeImBuf(orig_ibuf);
-
-	/* We put postprocessed frame to the cache always for now,
-	 * not the smartest thing in the world, but who cares at this point.
-	 */
-
-	/* TODO(sergey): Disable cache for now, because we don't store region
-	 * in the cache key and can't check whether cached version is usable for
-	 * us or not.
-	 *
-	 * Need to think better about what to cache and when.
-	 */
-	if (false) {
-		accesscache_put(accessor,
-		                clip_index,
-		                frame,
-		                input_mode,
-		                downscale,
-		                transform_key,
-		                final_ibuf);
-	}
-
+	BLI_spin_lock(&accessor->cache_lock);
+	/* Put final buffer to cache. */
+	accesscache_put(accessor,
+	                clip_index,
+	                frame,
+	                input_mode,
+	                downscale,
+	                region,
+	                transform_key,
+	                final_ibuf);
+	BLI_spin_unlock(&accessor->cache_lock);
 	return final_ibuf;
 }
 
@@ -876,7 +901,7 @@ static void accessor_release_image_callback(libmv_CacheKey cache_key)
 }
 
 static libmv_CacheKey accessor_get_mask_for_track_callback(
-        libmv_FrameAccessorUserData* user_data,
+        libmv_FrameAccessorUserData *user_data,
         int clip_index,
         int frame,
         int track_index,
@@ -958,6 +983,8 @@ TrackingImageAccessor *tracking_image_accessor_new(MovieClip *clips[MAX_ACCESSOR
 		                       accessor_get_mask_for_track_callback,
 		                       accessor_release_mask_callback);
 
+	BLI_spin_init(&accessor->cache_lock);
+
 	return accessor;
 }
 
@@ -965,5 +992,6 @@ void tracking_image_accessor_destroy(TrackingImageAccessor *accessor)
 {
 	IMB_moviecache_free(accessor->cache);
 	libmv_FrameAccessorDestroy(accessor->libmv_accessor);
+	BLI_spin_end(&accessor->cache_lock);
 	MEM_freeN(accessor);
 }
diff --git a/source/blender/blenkernel/intern/unit.c b/source/blender/blenkernel/intern/unit.c
index c0a373395dc..8606da0743b 100644
--- a/source/blender/blenkernel/intern/unit.c
+++ b/source/blender/blenkernel/intern/unit.c
@@ -372,6 +372,12 @@ static size_t unit_as_string(char *str, int len_max, double value, int prec, con
 
 	value_conv = value / unit->scalar;
 
+	/* Adjust precision to expected number of significant digits.
+	 * Note that here, we shall not have to worry about very big/small numbers, units are expected to replace
+	 * 'scientific notation' in those cases. */
+	prec -= integer_digits_d(value_conv);
+	CLAMP(prec, 0, 6);
+
 	/* Convert to a string */
 	len = BLI_snprintf_rlen(str, len_max, "%.*f", prec, value_conv);
 
@@ -442,12 +448,15 @@ size_t bUnit_AsString(char *str, int len_max, double value, int prec, int system
 			size_t i;
 			i = unit_as_string(str, len_max, value_a, prec, usys, unit_a, '\0');
 
+			prec -= integer_digits_d(value_a / unit_b->scalar) - integer_digits_d(value_b / unit_b->scalar);
+			prec = max_ii(prec, 0);
+
 			/* is there enough space for at least 1 char of the next unit? */
 			if (i + 2 < len_max) {
 				str[i++] = ' ';
 
 				/* use low precision since this is a smaller unit */
-				i += unit_as_string(str + i, len_max - i, value_b, prec ? 1 : 0, usys, unit_b, '\0');
+				i += unit_as_string(str + i, len_max - i, value_b, prec, usys, unit_b, '\0');
 			}
 			return i;
 		}
diff --git a/source/blender/blenkernel/intern/workspace.c b/source/blender/blenkernel/intern/workspace.c
index 82fface7d06..05dab9208e5 100644
--- a/source/blender/blenkernel/intern/workspace.c
+++ b/source/blender/blenkernel/intern/workspace.c
@@ -117,11 +117,11 @@ static void *workspace_relation_get_data_matching_parent(
  * Hence, this should only be used as assert check before assigining a screen to a workspace.
  */
 #ifndef NDEBUG
-static bool workspaces_is_screen_used(
+static bool workspaces_is_screen_used
 #else
-static bool UNUSED_FUNCTION(workspaces_is_screen_used)(
+static bool UNUSED_FUNCTION(workspaces_is_screen_used)
 #endif
-        const Main *bmain, bScreen *screen)
+        (const Main *bmain, bScreen *screen)
 {
 	for (WorkSpace *workspace = bmain->workspaces.first; workspace; workspace = workspace->id.next) {
 		if (workspace_layout_find_exec(workspace, screen)) {
@@ -137,7 +137,7 @@ static bool UNUSED_FUNCTION(workspaces_is_screen_used)(
 
 WorkSpace *BKE_workspace_add(Main *bmain, const char *name)
 {
-	WorkSpace *new_workspace = BKE_libblock_alloc(bmain, ID_WS, name);
+	WorkSpace *new_workspace = BKE_libblock_alloc(bmain, ID_WS, name, 0);
 	return new_workspace;
 }
 
diff --git a/source/blender/blenkernel/intern/world.c b/source/blender/blenkernel/intern/world.c
index 363c36e644d..cbe00e3bbc6 100644
--- a/source/blender/blenkernel/intern/world.c
+++ b/source/blender/blenkernel/intern/world.c
@@ -112,43 +112,59 @@ World *add_world(Main *bmain, const char *name)
 {
 	World *wrld;
 
-	wrld = BKE_libblock_alloc(bmain, ID_WO, name);
+	wrld = BKE_libblock_alloc(bmain, ID_WO, name, 0);
 
 	BKE_world_init(wrld);
 
 	return wrld;
 }
 
-World *BKE_world_copy(Main *bmain, const World *wrld)
+/**
+ * Only copy internal data of World ID from source to already allocated/initialized destination.
+ * You probably nerver want to use that directly, use id_copy or BKE_id_copy_ex for typical needs.
+ *
+ * WARNING! This function will not handle ID user count!
+ *
+ * \param flag  Copying options (see BKE_library.h's LIB_ID_COPY_... flags for more).
+ */
+void BKE_world_copy_data(Main *bmain, World *wrld_dst, const World *wrld_src, const int flag)
 {
-	World *wrldn;
-	int a;
-	
-	wrldn = BKE_libblock_copy(bmain, &wrld->id);
-	
-	for (a = 0; a < MAX_MTEX; a++) {
-		if (wrld->mtex[a]) {
-			wrldn->mtex[a] = MEM_mallocN(sizeof(MTex), "BKE_world_copy");
-			memcpy(wrldn->mtex[a], wrld->mtex[a], sizeof(MTex));
-			id_us_plus((ID *)wrldn->mtex[a]->tex);
+	for (int a = 0; a < MAX_MTEX; a++) {
+		if (wrld_src->mtex[a]) {
+			wrld_dst->mtex[a] = MEM_dupallocN(wrld_src->mtex[a]);
 		}
 	}
 
-	if (wrld->nodetree) {
-		wrldn->nodetree = ntreeCopyTree(bmain, wrld->nodetree);
+	if (wrld_src->nodetree) {
+		BKE_id_copy_ex(bmain, (ID *)wrld_src->nodetree, (ID **)&wrld_dst->nodetree, flag, false);
 	}
-	
-	BKE_previewimg_id_copy(&wrldn->id, &wrld->id);
 
-	BLI_listbase_clear(&wrldn->gpumaterial);
+	BLI_listbase_clear(&wrld_dst->gpumaterial);
 
-	BKE_id_copy_ensure_local(bmain, &wrld->id, &wrldn->id);
+	if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
+		BKE_previewimg_id_copy(&wrld_dst->id, &wrld_src->id);
+	}
+	else {
+		wrld_dst->preview = NULL;
+	}
+}
 
-	return wrldn;
+World *BKE_world_copy(Main *bmain, const World *wrld)
+{
+	World *wrld_copy;
+	BKE_id_copy_ex(bmain, &wrld->id, (ID **)&wrld_copy, 0, false);
+	return wrld_copy;
 }
 
 World *localize_world(World *wrld)
 {
+	/* TODO replace with something like
+	 * 	World *wrld_copy;
+	 * 	BKE_id_copy_ex(bmain, &wrld->id, (ID **)&wrld_copy, LIB_ID_COPY_NO_MAIN | LIB_ID_COPY_NO_PREVIEW | LIB_ID_COPY_NO_USER_REFCOUNT, false);
+	 * 	return wrld_copy;
+	 *
+	 * ... Once f*** nodes are fully converted to that too :( */
+
 	World *wrldn;
 	int a;
 	
@@ -175,3 +191,14 @@ void BKE_world_make_local(Main *bmain, World *wrld, const bool lib_local)
 {
 	BKE_id_make_local_generic(bmain, &wrld->id, true, lib_local);
 }
+
+void BKE_world_eval(const struct EvaluationContext *UNUSED(eval_ctx), World *world)
+{
+	if (G.debug & G_DEBUG_DEPSGRAPH) {
+		printf("%s on %s (%p)\n", __func__, world->id.name, world);
+	}
+	if (!BLI_listbase_is_empty(&world->gpumaterial)) {
+		world->update_flag = 1;
+		GPU_material_uniform_buffer_tag_dirty(&world->gpumaterial);
+	}
+}
diff --git a/source/blender/blenkernel/intern/writeavi.c b/source/blender/blenkernel/intern/writeavi.c
index 89b2caa5ac7..2fb4ed03603 100644
--- a/source/blender/blenkernel/intern/writeavi.c
+++ b/source/blender/blenkernel/intern/writeavi.c
@@ -80,10 +80,6 @@ static void *context_create_avi(void);
 static void context_free_avi(void *context_v);
 #endif  /* WITH_AVI */
 
-#ifdef WITH_QUICKTIME
-#  include "quicktime_export.h"
-#endif
-
 #ifdef WITH_FFMPEG
 #  include "BKE_writeffmpeg.h"
 #endif
@@ -115,16 +111,6 @@ bMovieHandle *BKE_movie_handle_get(const char imtype)
 #endif
 
 	/* do the platform specific handles */
-#ifdef WITH_QUICKTIME
-	if (imtype == R_IMF_IMTYPE_QUICKTIME) {
-		mh.start_movie = start_qt;
-		mh.append_movie = append_qt;
-		mh.end_movie = end_qt;
-		mh.get_movie_path = filepath_qt;
-		mh.context_create = context_create_qt;
-		mh.context_free = context_free_qt;
-	}
-#endif
 #ifdef WITH_FFMPEG
 	if (ELEM(imtype, R_IMF_IMTYPE_FFMPEG, R_IMF_IMTYPE_H264, R_IMF_IMTYPE_XVID, R_IMF_IMTYPE_THEORA)) {
 		mh.start_movie = BKE_ffmpeg_start;
diff --git a/source/blender/blenkernel/intern/writeffmpeg.c b/source/blender/blenkernel/intern/writeffmpeg.c
index 156b74f5c3d..b47846cbdec 100644
--- a/source/blender/blenkernel/intern/writeffmpeg.c
+++ b/source/blender/blenkernel/intern/writeffmpeg.c
@@ -45,8 +45,8 @@
 #include "BLI_blenlib.h"
 
 #ifdef WITH_AUDASPACE
-#  include AUD_DEVICE_H
-#  include AUD_SPECIAL_H
+#  include <AUD_Device.h>
+#  include <AUD_Special.h>
 #endif
 
 #include "BLI_utildefines.h"
@@ -681,6 +681,7 @@ static AVStream *alloc_video_stream(FFMpegContext *context, RenderData *rd, int
 	/* xasp & yasp got float lately... */
 
 	st->sample_aspect_ratio = c->sample_aspect_ratio = av_d2q(((double) rd->xasp / (double) rd->yasp), 255);
+	st->avg_frame_rate = av_inv_q(c->time_base);
 
 	set_ffmpeg_properties(rd, c, "video", &opts);