Fix assert in original modifiers pointer update function

The issue was happening with a specific file where the ID management
code was not fully copying all modifiers because of the extra check
in the `BKE_object_support_modifier_type_check()`.

While it is arguable that copy-on-write should be a 1:1 copy there is
no real need to maintain the per-modifier pointer to its original.
Use its SessionUUID to perform lookup in the original datablock.

Downside of this approach is that it is a linear lookup instead of
direct pointer access, but the upside is that there is less pointers
to manage and that the file with unsupported modifiers does behave
correct without any asserts.

Differential Revision: https://developer.blender.org/D13993

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/editors/armature/meshlaplacian.c b/source/blender/editors/armature/meshlaplacian.c
index 787d7cbaab0..14f47a84286 100644
--- a/source/blender/editors/armature/meshlaplacian.c
+++ b/source/blender/editors/armature/meshlaplacian.c
@@ -1742,14 +1742,15 @@ static void harmonic_coordinates_bind(MeshDeformModifierData *mmd, MeshDeformBin
   free_bvhtree_from_mesh(&mdb->bvhdata);
 }
 
-void ED_mesh_deform_bind_callback(MeshDeformModifierData *mmd,
+void ED_mesh_deform_bind_callback(Object *object,
+                                  MeshDeformModifierData *mmd,
                                   Mesh *cagemesh,
                                   float *vertexcos,
                                   int totvert,
                                   float cagemat[4][4])
 {
   MeshDeformModifierData *mmd_orig = (MeshDeformModifierData *)BKE_modifier_get_original(
-      &mmd->modifier);
+      object, &mmd->modifier);
   MeshDeformBind mdb;
   MVert *mvert;
   int a;