Reverse the winding order of faces when exporting to a left-handed system.

1 files changed, 7 insertions, 0 deletions

diff --git a/io_scene_x/export_x.py b/io_scene_x/export_x.py
index 47d30a10..8f7d82d5 100644
--- a/io_scene_x/export_x.py
+++ b/io_scene_x/export_x.py
@@ -476,6 +476,9 @@ class MeshExportObject(ExportObject):
             
             self.Exporter.File.Write("{};".format(len(PolygonVertexIndices)))
             
+            if self.Config.CoordinateSystem == 'LEFT_HANDED':
+                PolygonVertexIndices = PolygonVertexIndices[::-1]
+            
             for VertexCountIndex, VertexIndex in \
                 enumerate(PolygonVertexIndices):
 
@@ -584,6 +587,9 @@ class MeshExportObject(ExportObject):
         for Index, Polygon in enumerate(MeshEnumerator.PolygonVertexIndices):
             self.Exporter.File.Write("{};".format(len(Polygon)))
             
+            if self.Config.CoordinateSystem == 'LEFT_HANDED':
+                Polygon = Polygon[::-1]
+            
             for VertexCountIndex, VertexIndex in enumerate(Polygon):
                 if VertexCountIndex == len(Polygon) - 1:
                     self.Exporter.File.Write("{};".format(VertexIndex),
@@ -1373,3 +1379,4 @@ class Util:
             return x.name
         
         return sorted(List, key=SortKey)
+