Fix T59848: precisely represent the dependencies of Armature modifier.

When the modifier uses vertex groups, the set of the bones it actually
needs is precisely defined by the set of the group names. If envelopes
are enabled, this refinement is not available, because any bone can
potentially be used.

This can be used in the dependency graph construction to allow objects
deformed by a part of the armature to be used in constraints on other
bones, e.g. for placing cartoon-style face elements on top of the body
mesh via Shrinkwrap constraints.

Since the list of vertex group names is now used as an input by
the dependency graph, adding/removing/renaming groups should now
be triggering a graph rebuild.

Differential Revision: https://developer.blender.org/D4715

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c b/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c
index 88aed201b48..c71315872f6 100644
--- a/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c
+++ b/source/blender/editors/sculpt_paint/paint_vertex_weight_utils.c
@@ -41,6 +41,8 @@
 #include "BKE_report.h"
 #include "BKE_object.h"
 
+#include "DEG_depsgraph_build.h"
+
 /* Only for blend modes. */
 #include "IMB_imbuf.h"
 
@@ -93,6 +95,7 @@ bool ED_wpaint_ensure_data(bContext *C,
           bDeformGroup *dg = defgroup_find_name(ob, pchan->name);
           if (dg == NULL) {
             dg = BKE_object_defgroup_add_name(ob, pchan->name); /* sets actdef */
+            DEG_relations_tag_update(CTX_data_main(C));
           }
           else {
             int actdef = 1 + BLI_findindex(&ob->defbase, dg);
@@ -105,6 +108,7 @@ bool ED_wpaint_ensure_data(bContext *C,
   }
   if (BLI_listbase_is_empty(&ob->defbase)) {
     BKE_object_defgroup_add(ob);
+    DEG_relations_tag_update(CTX_data_main(C));
   }
 
   /* ensure we don't try paint onto an invalid group */