From 051770b36de923a34a023ccd598dd315d2428f3a Mon Sep 17 00:00:00 2001
From: Julien Duroure <julien.duroure@gmail.com>
Date: Thu, 17 Sep 2020 18:53:03 +0200
Subject: [PATCH] glTF exporter: Fix T79104: avoid zero normals when degenerate
tris
---
io_scene_gltf2/__init__.py | 2 +-
io_scene_gltf2/blender/exp/gltf2_blender_extract.py | 6 ++++++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/io_scene_gltf2/__init__.py b/io_scene_gltf2/__init__.py
index 873b844dd..24ccb2e03 100755
--- a/io_scene_gltf2/__init__.py
+++ b/io_scene_gltf2/__init__.py
@@ -15,7 +15,7 @@
bl_info = {
'name': 'glTF 2.0 format',
'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin SchmithĂĽsen, Jim Eckerlein, and many external contributors',
- "version": (1, 4, 27),
+ "version": (1, 4, 28),
'blender': (2, 90, 0),
'location': 'File > Import-Export',
'description': 'Import-Export as glTF 2.0',
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_extract.py b/io_scene_gltf2/blender/exp/gltf2_blender_extract.py
index ca38aa725..5b9e68f51 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_extract.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_extract.py
@@ -348,6 +348,12 @@ def __get_normals(blender_mesh, key_blocks, armature, blender_object, export_set
ns[:] = __apply_mat_to_all(normal_transform, ns)
__normalize_vecs(ns)
+ for ns in [normals, *morph_normals]:
+ # Replace zero normals with the unit UP vector.
+ # Seems to happen sometimes with degenerate tris?
+ is_zero = ~ns.any(axis=1)
+ ns[is_zero, 2] = 1
+
# glTF stores deltas in morph targets
for ns in morph_normals:
ns -= normals
--
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