Fix T63283: Second subdivision modifier does not ignore crease

This is something where there is no single correct behavior,
sometimes it's needed to ignore the crease to make mesh more
smooth. But sometimes crease is to be considered after first
subdivision surface: for example, when adding extra subdivisions
for render-time displacement.

Made it an option whether modifier needs to take crease into
account or not.

Existing files should be openable in the 2.7 compatible way,
to re-create an old behavior the options is to be manually
disabled in the modifier settings.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4652

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index 6dca81415f3..18ab5565d22 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -1278,6 +1278,11 @@ static void rna_def_modifier_subsurf(BlenderRNA *brna)
 	RNA_def_property_boolean_sdna(prop, NULL, "flags", eSubsurfModifierFlag_ControlEdges);
 	RNA_def_property_ui_text(prop, "Optimal Display", "Skip drawing/rendering of interior subdivided edges");
 	RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+	prop = RNA_def_property(srna, "use_creases", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flags", eSubsurfModifierFlag_UseCrease);
+	RNA_def_property_ui_text(prop, "Use Creases", "Use mesh edge crease information to sharpen edges");
+	RNA_def_property_update(prop, 0, "rna_Modifier_update");
 }
 
 static void rna_def_modifier_generic_map_info(StructRNA *srna)
@@ -1423,6 +1428,11 @@ static void rna_def_modifier_multires(BlenderRNA *brna)
 	RNA_def_property_boolean_sdna(prop, NULL, "flags", eMultiresModifierFlag_ControlEdges);
 	RNA_def_property_ui_text(prop, "Optimal Display", "Skip drawing/rendering of interior subdivided edges");
 	RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+	prop = RNA_def_property(srna, "use_creases", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flags", eMultiresModifierFlag_UseCrease);
+	RNA_def_property_ui_text(prop, "Use Creases", "Use mesh edge crease information to sharpen edges");
+	RNA_def_property_update(prop, 0, "rna_Modifier_update");
 }
 
 static void rna_def_modifier_lattice(BlenderRNA *brna)