New option for multires modifier: Subdivide UVs

Enabled by default and also enabled for older filesm so
there should be no regressions.

In some cases it's useful to not use subdivided uvs for multires.

4 files changed, 17 insertions, 8 deletions

diff --git a/release/scripts/startup/bl_ui/properties_data_modifier.py b/release/scripts/startup/bl_ui/properties_data_modifier.py
index ce6d0990f05..0a4d0b60514 100644
--- a/release/scripts/startup/bl_ui/properties_data_modifier.py
+++ b/release/scripts/startup/bl_ui/properties_data_modifier.py
@@ -394,6 +394,7 @@ class DATA_PT_modifiers(ModifierButtonsPanel, bpy.types.Panel):
         col.operator("object.multires_higher_levels_delete", text="Delete Higher")
         col.operator("object.multires_reshape", text="Reshape")
         col.operator("object.multires_base_apply", text="Apply Base")
+        col.prop(md, "use_subsurf_uv")
         col.prop(md, "show_only_control_edges")
 
         layout.separator()
diff --git a/source/blender/blenkernel/intern/multires.c b/source/blender/blenkernel/intern/multires.c
index d833c184274..88a670ecb22 100644
--- a/source/blender/blenkernel/intern/multires.c
+++ b/source/blender/blenkernel/intern/multires.c
@@ -465,12 +465,13 @@ static DerivedMesh *multires_dm_create_local(Object *ob, DerivedMesh *dm, int lv
 	return multires_dm_create_from_derived(&mmd, 1, dm, ob, 0, 0);
 }
 
-static DerivedMesh *subsurf_dm_create_local(Object *ob, DerivedMesh *dm, int lvl, int simple, int optimal)
+static DerivedMesh *subsurf_dm_create_local(Object *ob, DerivedMesh *dm, int lvl, int simple, int optimal, int plain_uv)
 {
 	SubsurfModifierData smd= {{NULL}};
 
 	smd.levels = smd.renderLevels = lvl;
-	smd.flags |= eSubsurfModifierFlag_SubsurfUv;
+	if(!plain_uv)
+		smd.flags |= eSubsurfModifierFlag_SubsurfUv;
 	if(simple)
 		smd.subdivType = ME_SIMPLE_SUBSURF;
 	if(optimal)
@@ -591,7 +592,7 @@ void multiresModifier_base_apply(MultiresModifierData *mmd, Object *ob)
 	/* subdivide the mesh to highest level without displacements */
 	cddm = CDDM_from_mesh(me, NULL);
 	DM_set_only_copy(cddm, CD_MASK_BAREMESH);
-	origdm = subsurf_dm_create_local(ob, cddm, totlvl, 0, 0);
+	origdm = subsurf_dm_create_local(ob, cddm, totlvl, 0, 0, mmd->flags & eMultiresModifierFlag_PlainUv);
 	cddm->release(cddm);
 
 	/* calc disps */
@@ -626,7 +627,7 @@ static void multires_subdivide(MultiresModifierData *mmd, Object *ob, int totlvl
 		/* create subsurf DM from original mesh at high level */
 		cddm = CDDM_from_mesh(me, NULL);
 		DM_set_only_copy(cddm, CD_MASK_BAREMESH);
-		highdm = subsurf_dm_create_local(ob, cddm, totlvl, simple, 0);
+		highdm = subsurf_dm_create_local(ob, cddm, totlvl, simple, 0, mmd->flags & eMultiresModifierFlag_PlainUv);
 
 		/* create multires DM from original mesh at low level */
 		lowdm = multires_dm_create_local(ob, cddm, lvl, lvl, simple);
@@ -830,7 +831,7 @@ static void multiresModifier_update(DerivedMesh *dm)
 			else cddm = CDDM_from_mesh(me, NULL);
 			DM_set_only_copy(cddm, CD_MASK_BAREMESH);
 
-			highdm = subsurf_dm_create_local(ob, cddm, totlvl, mmd->simple, 0);
+			highdm = subsurf_dm_create_local(ob, cddm, totlvl, mmd->simple, 0, mmd->flags & eMultiresModifierFlag_PlainUv);
 
 			/* create multires DM from original mesh and displacements */
 			lowdm = multires_dm_create_local(ob, cddm, lvl, totlvl, mmd->simple);
@@ -884,7 +885,7 @@ static void multiresModifier_update(DerivedMesh *dm)
 			else cddm = CDDM_from_mesh(me, NULL);
 			DM_set_only_copy(cddm, CD_MASK_BAREMESH);
 
-			subdm = subsurf_dm_create_local(ob, cddm, mmd->totlvl, mmd->simple, 0);
+			subdm = subsurf_dm_create_local(ob, cddm, mmd->totlvl, mmd->simple, 0, mmd->flags & eMultiresModifierFlag_PlainUv);
 			cddm->release(cddm);
 
 			multiresModifier_disp_run(dm, me, 1, 0, subdm->getGridData(subdm), mmd->totlvl);
@@ -927,7 +928,8 @@ DerivedMesh *multires_dm_create_from_derived(MultiresModifierData *mmd, int loca
 		return dm;
 
 	result = subsurf_dm_create_local(ob, dm, lvl,
-		mmd->simple, mmd->flags & eMultiresModifierFlag_ControlEdges);
+		mmd->simple, mmd->flags & eMultiresModifierFlag_ControlEdges,
+		mmd->flags & eMultiresModifierFlag_PlainUv);
 
 	if(!local_mmd) {
 		ccgdm = (CCGDerivedMesh*)result;
@@ -1633,7 +1635,7 @@ static void multires_apply_smat(Scene *scene, Object *ob, float smat[3][3])
 	MEM_freeN(vertCos);
 
 	/* scaled ccgDM for tangent space of object with applied scale */
-	dm= subsurf_dm_create_local(ob, cddm, high_mmd.totlvl, high_mmd.simple, 0);
+	dm= subsurf_dm_create_local(ob, cddm, high_mmd.totlvl, high_mmd.simple, 0, mmd->flags & eMultiresModifierFlag_PlainUv);
 	cddm->release(cddm);
 
 	/*numGrids= dm->getNumGrids(dm);*/ /*UNUSED*/
diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index d2d8e014015..3787675f339 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -624,6 +624,7 @@ typedef struct MultiresModifierData {
 
 typedef enum {
 	eMultiresModifierFlag_ControlEdges = (1<<0),
+	eMultiresModifierFlag_PlainUv = (1<<1),
 } MultiresModifierFlag;
 
 typedef struct FluidsimModifierData {
diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index d2c1b862fee..ba655915fb6 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -805,6 +805,11 @@ static void rna_def_modifier_multires(BlenderRNA *brna)
 	RNA_def_property_boolean_sdna(prop, NULL, "flags", eMultiresModifierFlag_ControlEdges);
 	RNA_def_property_ui_text(prop, "Optimal Display", "Skip drawing/rendering of interior subdivided edges");
 	RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+	prop= RNA_def_property(srna, "use_subsurf_uv", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_negative_sdna(prop, NULL, "flags", eMultiresModifierFlag_PlainUv);
+	RNA_def_property_ui_text(prop, "Subdivide UVs", "Use subsurf to subdivide UVs");
+	RNA_def_property_update(prop, 0, "rna_Modifier_update");
 }
 
 static void rna_def_modifier_lattice(BlenderRNA *brna)