From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 3 Jul 2019 16:35:05 +0000 (+0300)
Subject: Correctly process meshes with empty material slots
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=7ffc6b595b9c8405d1044f8a4d4d3098392e13fa

Correctly process meshes with empty material slots

This may happen if materials are defined on the object rather than on
the mesh.
---

diff --git a/blender/io_mspgl/export_object.py b/blender/io_mspgl/export_object.py
index 0e6a9022..6e399b01 100644
--- a/blender/io_mspgl/export_object.py
+++ b/blender/io_mspgl/export_object.py
@@ -105,7 +105,7 @@ class ObjectExporter:
 			progress.push_task_slice("LOD {}".format(lod_index), i, len(lods))
 
 			material_map = None
-			mapped_count = sum(m.material_map for m in l.data.materials)
+			mapped_count = sum(m.material_map for m in l.data.materials if m)
 			if mapped_count:
 				material_map_tech = l.data.materials[0].technique
 				tech_mismatch = any(m.technique!=material_map_tech for m in l.data.materials)