Subdivision Surfaces: add option disable using the limit surface

This makes subdivision surfaces compatible with the old subdivision
surface modifier and other applications that do not use the limit surface.

This option is available on the Subdivision Surface modifier.

Differential Revision: https://developer.blender.org/D8413

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index 0070f9873b0..134ce15e3f2 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -1762,6 +1762,15 @@ static void rna_def_modifier_subsurf(BlenderRNA *brna)
       prop, "Use Custom Normals", "Interpolates existing custom normals to resulting mesh");
   RNA_def_property_update(prop, 0, "rna_Modifier_update");
 
+  prop = RNA_def_property(srna, "use_limit_surface", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_negative_sdna(
+      prop, NULL, "flags", eSubsurfModifierFlag_UseRecursiveSubdivision);
+  RNA_def_property_ui_text(prop,
+                           "Use Limit Surface",
+                           "Place vertices at the surface that would be produced with infinite "
+                           "levels of subdivision (smoothest possible shape)");
+  RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
   RNA_define_lib_overridable(false);
 }