Fix T55470: Add option to not fix polygons' winding to Edit Normals modifier.

this is actually adding option to add buggy behavior, but.. NPR often
expects buggy behaviors, and its one of the main targets for normal editing.
So think it's reasonable to add that option (disabled by default of
course).

Note that am not really happy with UI, but:
* Not sure where to put it, it's kind of own self-contained area option.
* Don't to make it too much visible, using this should be the exception!

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index c3ba1372a44..a29f10684bb 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -4847,6 +4847,14 @@ static void rna_def_modifier_normaledit(BlenderRNA *brna)
 	RNA_def_property_subtype(prop, PROP_ANGLE);
 	RNA_def_property_update(prop, 0, "rna_Modifier_update");
 
+	prop = RNA_def_property(srna, "no_polynors_fix", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "flag", MOD_NORMALEDIT_NO_POLYNORS_FIX);
+	RNA_def_property_boolean_default(prop, false);
+	RNA_def_property_ui_text(prop, "Lock Polygon Normals",
+	                         "Do not flip polygons when their normals are not consistent "
+	                         "with their newly computed custom vertex normals");
+	RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
 	prop = RNA_def_property(srna, "vertex_group", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "defgrp_name");
 	RNA_def_property_ui_text(prop, "Vertex Group", "Vertex group name for selecting/weighting the affected areas");