Fix T85697: subdivision surface node output does not contain vertex group names

The vertex weights were actually interpolated correctly. The issue was that
vertex group names were removed from the output geometry set. We have
to keep track of these names separately from the mesh, for legacy reasons.
Vertex group names are not stored on meshes but objects instead.

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/nodes/geometry/nodes/node_geo_subdivision_surface.cc b/source/blender/nodes/geometry/nodes/node_geo_subdivision_surface.cc
index 4cdb669f964..47304a0de68 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_subdivision_surface.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_subdivision_surface.cc
@@ -109,7 +109,8 @@ static void geo_node_subdivision_surface_exec(GeoNodeExecParams params)
   Mesh *mesh_out = BKE_subdiv_to_mesh(subdiv, &mesh_settings, mesh_in);
   BKE_mesh_calc_normals(mesh_out);
 
-  geometry_set.replace_mesh(mesh_out);
+  MeshComponent &mesh_component = geometry_set.get_component_for_write<MeshComponent>();
+  mesh_component.replace_mesh_but_keep_vertex_group_names(mesh_out);
 
   // BKE_subdiv_stats_print(&subdiv->stats);
   BKE_subdiv_free(subdiv);