Fix T99253: Missing face center dots with deform modifier cage option

Before 8c25889bb67db4c, subsurf face center tags were stored in each
vertex, so they were always copied to duplicate meshes. Now they are
stored in runtime data though, so they need to be copied explicitly.
The function name "reset_on_copy" is a bit awkward here, so the
tags are copied by the caller.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/mesh.cc b/source/blender/blenkernel/intern/mesh.cc
index cf05dc0404e..afd8e49f884 100644
--- a/source/blender/blenkernel/intern/mesh.cc
+++ b/source/blender/blenkernel/intern/mesh.cc
@@ -96,6 +96,10 @@ static void mesh_copy_data(Main *bmain, ID *id_dst, const ID *id_src, const int
   const Mesh *mesh_src = (const Mesh *)id_src;
 
   BKE_mesh_runtime_reset_on_copy(mesh_dst, flag);
+  /* Copy face dot tags, since meshes may be duplicated after a subsurf modifier
+   * or node, but we still need to be able to draw face center vertices. */
+  mesh_dst->runtime.subsurf_face_dot_tags = static_cast<uint32_t *>(
+      MEM_dupallocN(mesh_src->runtime.subsurf_face_dot_tags));
   if ((mesh_src->id.tag & LIB_TAG_NO_MAIN) == 0) {
     /* This is a direct copy of a main mesh, so for now it has the same topology. */
     mesh_dst->runtime.deformed_only = true;