Modifier: smooth interpolation support

Add an option to the mask modifier to use the vertex weights to generate
smooth in between geometry, instead of just deleting non complete faces.

This can be used to make all sorts of smooth dissolve animations
directly with geometry, which are usually hacked together with shaders.
It also allows for implicit function plotting using geometry nodes and
boolean like operations on non manifold geometry with the proximity
modifier.

Reviewed By: campbellbarton

Ref D10979

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index 486d8d13564..f11d845c582 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -4431,6 +4431,12 @@ static void rna_def_modifier_mask(BlenderRNA *brna)
   RNA_def_property_ui_text(prop, "Invert", "Use vertices that are not part of region defined");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");
 
+  prop = RNA_def_property(srna, "use_smooth", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "flag", MOD_MASK_SMOOTH);
+  RNA_def_property_ui_text(
+      prop, "Smooth", "Use vertex group weights to cut faces at the weight contour");
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
   prop = RNA_def_property(srna, "threshold", PROP_FLOAT, PROP_FACTOR);
   RNA_def_property_float_sdna(prop, NULL, "threshold");
   RNA_def_property_range(prop, 0.0, 1.0);