dont use tface hide or select anymore, since maintaining 2 sets of hide/select data for each face is annoying.

using mface->flag for both.

Also found that the cdDM_drawMappedFaces and cdDM_drawFacesTex_common could get normals mixed up when rendering hidden faces. because hidden/invisible faces used continue without advancing to the next normal.

release/scripts/bpymodules/BPyRender.py

@@ -223,9 +223,8 @@ def mesh2uv(me_s, PREF_SEL_FACES_ONLY=False):
 	material_list= []
 	for me in me_s:
 		me_materials= me.materials
-		FACE_SEL= Blender.Mesh.FaceFlags.SELECT
 		if PREF_SEL_FACES_ONLY:
-			me_faces= [f for f in me.faces if f.flag & FACE_SEL]
+			me_faces= [f for f in me.faces if f.sel]
 		else:
 			me_faces= me.faces