Cycles: support for motion vector and UV passes.

Most of the changes are related to adding support for motion data throughout
the code. There's some code for actual camera/object motion blur raytracing
but it's unfinished (it badly slows down the raytracing kernel even when the
option is turned off), so that code it disabled still.

Motion vector export from Blender tries to avoid computing derived meshes
when the mesh does not have a deforming modifier, and it also won't store
motion vectors for every vertex if only the object or camera is moving.

4 files changed, 45 insertions, 7 deletions

diff --git a/source/blender/blenkernel/BKE_object.h b/source/blender/blenkernel/BKE_object.h
index 971320765e9..4fced71d7f2 100644
--- a/source/blender/blenkernel/BKE_object.h
+++ b/source/blender/blenkernel/BKE_object.h
@@ -152,6 +152,7 @@ int object_insert_ptcache(struct Object *ob);
 struct KeyBlock *object_insert_shape_key(struct Scene *scene, struct Object *ob, const char *name, int from_mix);
 
 int object_is_modified(struct Scene *scene, struct Object *ob);
+int object_is_deform_modified(struct Scene *scene, struct Object *ob);
 
 void object_relink(struct Object *ob);
 
diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 9959edaac16..830184513d1 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -2982,8 +2982,7 @@ KeyBlock *object_insert_shape_key(Scene *scene, Object *ob, const char *name, in
 }
 
 /* most important if this is modified it should _always_ return True, in certain
- * cases false positives are hard to avoid (shape keys for eg)
- */
+ * cases false positives are hard to avoid (shape keys for example) */
 int object_is_modified(Scene *scene, Object *ob)
 {
 	int flag= 0;
@@ -2998,13 +2997,38 @@ int object_is_modified(Scene *scene, Object *ob)
 		     md && (flag != (eModifierMode_Render | eModifierMode_Realtime));
 		     md=md->next)
 		{
-			if ((flag & eModifierMode_Render) == 0	&& modifier_isEnabled(scene, md, eModifierMode_Render)) {
+			if ((flag & eModifierMode_Render) == 0 && modifier_isEnabled(scene, md, eModifierMode_Render))
 				flag |= eModifierMode_Render;
-			}
 
-			if ((flag & eModifierMode_Realtime) == 0	&& modifier_isEnabled(scene, md, eModifierMode_Realtime)) {
+			if ((flag & eModifierMode_Realtime) == 0 && modifier_isEnabled(scene, md, eModifierMode_Realtime))
+				flag |= eModifierMode_Realtime;
+		}
+	}
+
+	return flag;
+}
+
+/* test if object is affected by deforming modifiers (for motion blur). again
+ * most important is to avoid false positives, this is to skip computations
+ * and we can still if there was actual deformation afterwards */
+int object_is_deform_modified(Scene *scene, Object *ob)
+{
+	ModifierData *md;
+	int flag= 0;
+
+	/* cloth */
+	for (md=modifiers_getVirtualModifierList(ob);
+		 md && (flag != (eModifierMode_Render | eModifierMode_Realtime));
+		 md=md->next)
+	{
+		ModifierTypeInfo *mti = modifierType_getInfo(md->type);
+
+		if (mti->type == eModifierTypeType_OnlyDeform) {
+			if (!(flag & eModifierMode_Render) && modifier_isEnabled(scene, md, eModifierMode_Render))
+				flag |= eModifierMode_Render;
+
+			if (!(flag & eModifierMode_Realtime) && modifier_isEnabled(scene, md, eModifierMode_Realtime))
 				flag |= eModifierMode_Realtime;
-			}
 		}
 	}
 
diff --git a/source/blender/makesrna/intern/rna_object_api.c b/source/blender/makesrna/intern/rna_object_api.c
index d09dedb4f4c..cb0f1d307aa 100644
--- a/source/blender/makesrna/intern/rna_object_api.c
+++ b/source/blender/makesrna/intern/rna_object_api.c
@@ -476,6 +476,11 @@ int rna_Object_is_modified(Object *ob, Scene *scene, int settings)
 	return object_is_modified(scene, ob) & settings;
 }
 
+int rna_Object_is_deform_modified(Object *ob, Scene *scene, int settings)
+{
+	return object_is_deform_modified(scene, ob) & settings;
+}
+
 #ifndef NDEBUG
 void rna_Object_dm_info(struct Object *ob, int type, char *result)
 {
@@ -644,6 +649,14 @@ void RNA_api_object(StructRNA *srna)
 	parm = RNA_def_boolean(func, "result", 0, "", "Object visibility");
 	RNA_def_function_return(func, parm);
 
+	func = RNA_def_function(srna, "is_deform_modified", "rna_Object_is_deform_modified");
+	RNA_def_function_ui_description(func, "Determine if this object is modified by a deformation from the base mesh data");
+	parm = RNA_def_pointer(func, "scene", "Scene", "", "");
+	RNA_def_property_flag(parm, PROP_REQUIRED|PROP_NEVER_NULL);
+	parm = RNA_def_enum(func, "settings", mesh_type_items, 0, "", "Modifier settings to apply");
+	RNA_def_property_flag(parm, PROP_REQUIRED);
+	parm = RNA_def_boolean(func, "result", 0, "", "Object visibility");
+	RNA_def_function_return(func, parm);
 
 #ifndef NDEBUG
 	/* mesh */
diff --git a/source/blender/makesrna/intern/rna_scene_api.c b/source/blender/makesrna/intern/rna_scene_api.c
index 08ed7625a01..c92a29cec3c 100644
--- a/source/blender/makesrna/intern/rna_scene_api.c
+++ b/source/blender/makesrna/intern/rna_scene_api.c
@@ -50,7 +50,7 @@
 
 
 
-static void rna_Scene_frame_set(Scene *scene, int frame, float subframe)
+void rna_Scene_frame_set(Scene *scene, int frame, float subframe)
 {
 	scene->r.cfra = frame;
 	scene->r.subframe = subframe;