Fixes for modifier data in multi-user meshes.

When removing a skin or multires modifier, it skips deletion of the
associated CustomData layer if the object has any other modifiers of
that type. This check has been extended to all objects that use the
object's data.

Similarly, deleting higher multires levels and multires subdivision
will not update the maximum level of any other multires modifiers on
objects that link to the same mesh.

Note that modifier_apply_obdata() doesn't need any changes as it
does not allow applying to multi-user data.

Object joining has also been modified to synchronize multires levels
objects that share a mesh. This is needed because joining can
subdivide or delete levels in order to match the maximum level of the
join-from object to the join-to object.

Fixes bug [#31880] instance multiresolution modifier error.
http://projects.blender.org/tracker/index.php?func=detail&aid=31880&group_id=9&atid=498

Reviewed by Sergey:
http://codereview.appspot.com/6332047/

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index 9c10a270ef8..9209bbb2db7 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -176,6 +176,12 @@ int ED_object_modifier_apply(struct ReportList *reports, struct Scene *scene,
                              struct Object *ob, struct ModifierData *md, int mode);
 int ED_object_modifier_copy(struct ReportList *reports, struct Object *ob, struct ModifierData *md);
 
+int ED_object_iter_other(struct Main *bmain, struct Object *orig_ob, int include_orig,
+						 int (*callback)(struct Object *ob, void *callback_data),
+						 void *callback_data);
+
+int ED_object_multires_update_totlevels_cb(struct Object *ob, void *totlevel_v);
+
 #ifdef __cplusplus
 }
 #endif