glTF exporter: Fix T79104: avoid zero normals when degenerate tris
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blender-bot
2023-02-14 18:51:10 +01:00
Referenced by issue #79104, Exporting a valid GLTF (was valid before import) causes GLTF validation errors
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@ -15,7 +15,7 @@
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bl_info = {
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'name': 'glTF 2.0 format',
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'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
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"version": (1, 4, 27),
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"version": (1, 4, 28),
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'blender': (2, 90, 0),
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'location': 'File > Import-Export',
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'description': 'Import-Export as glTF 2.0',
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@ -348,6 +348,12 @@ def __get_normals(blender_mesh, key_blocks, armature, blender_object, export_set
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ns[:] = __apply_mat_to_all(normal_transform, ns)
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__normalize_vecs(ns)
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for ns in [normals, *morph_normals]:
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# Replace zero normals with the unit UP vector.
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# Seems to happen sometimes with degenerate tris?
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is_zero = ~ns.any(axis=1)
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ns[is_zero, 2] = 1
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# glTF stores deltas in morph targets
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for ns in morph_normals:
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ns -= normals
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