New modifier type: eModifierTypeType_NonGeometrical, for modifiers affecting CustomData layers only (e.g. UVProject and WeightVG ones).

Also, allow applying to obdata those modifiers, even with shapekeys, but do not allow applying them *as* shapekey (as shapekeys do not have CD layers).

Fix [#29636] Vertex Weight Mix modifier "apply" button don't work.

Note: applying whit shape keys currently always uses base shape, not current one (for apply to obdata as well as apply to shapekey), but this is another topic...

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_modifier.h b/source/blender/blenkernel/BKE_modifier.h
index 84f8995b480..23073a2d8eb 100644
--- a/source/blender/blenkernel/BKE_modifier.h
+++ b/source/blender/blenkernel/BKE_modifier.h
@@ -65,6 +65,11 @@ typedef enum {
 	 * unless it's a mesh and can be exploded -> curve can also emit particles
 	 */
 	eModifierTypeType_DeformOrConstruct,
+
+	/* Like eModifierTypeType_Nonconstructive, but does not affect the geometry
+	 * of the object, rather some of its CustomData layers.
+	 * E.g. UVProject and WeightVG modifiers. */
+	eModifierTypeType_NonGeometrical,
 } ModifierTypeType;
 
 typedef enum {
@@ -311,6 +316,7 @@ int           modifier_supportsMapping(struct ModifierData *md);
 int           modifier_couldBeCage(struct Scene *scene, struct ModifierData *md);
 int           modifier_isCorrectableDeformed(struct ModifierData *md);
 int			  modifier_sameTopology(ModifierData *md);
+int           modifier_nonGeometrical(ModifierData *md);
 int           modifier_isEnabled(struct Scene *scene, struct ModifierData *md, int required_mode);
 void          modifier_setError(struct ModifierData *md, const char *format, ...)
 #ifdef __GNUC__