new weight paint draw option to display unweighted vertices with the option to check on the active group or all groups.

notes:
- vertices with zero weights are considered the same as vertices outside of a group.
- currently these show black but this can be made a theme color.
- multi-paint overrides this option (noted in description)

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_deform.h b/source/blender/blenkernel/BKE_deform.h
index 0fa7356b64e..b209e8bf667 100644
--- a/source/blender/blenkernel/BKE_deform.h
+++ b/source/blender/blenkernel/BKE_deform.h
@@ -55,6 +55,7 @@ void                     defvert_add_index_notest(struct MDeformVert *dv, int de
 void                     defvert_remove_group(struct MDeformVert *dvert, struct MDeformWeight *dw);
 void                     defvert_clear(struct MDeformVert *dvert);
 int                      defvert_find_shared(const struct MDeformVert *dvert_a, const struct MDeformVert *dvert_b);
+bool                     defvert_is_weight_zero(const struct MDeformVert *dvert, const int defgroup_tot);
 
 void BKE_defvert_array_free_elems(struct MDeformVert *dvert, int totvert);
 void BKE_defvert_array_free(struct MDeformVert *dvert, int totvert);