[Bf-extensions-cvs] [addeb64f] master: glTF exporter: Do not export special attributes, used internally by Blender

[Julien Duroure]

Commit: addeb64f82f401b72f217eb128ed8a5c4a164310
Author: Julien Duroure
Date:   Wed Nov 2 19:10:34 2022 +0100
Branches: master
https://developer.blender.org/rBAaddeb64f82f401b72f217eb128ed8a5c4a164310

glTF exporter: Do not export special attributes, used internally by Blender

===================================================================

M	io_scene_gltf2/__init__.py
M	io_scene_gltf2/blender/com/gltf2_blender_default.py
M	io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py

===================================================================

diff --git a/io_scene_gltf2/__init__.py b/io_scene_gltf2/__init__.py
index 0b6327d0..45acd1b3 100755
--- a/io_scene_gltf2/__init__.py
+++ b/io_scene_gltf2/__init__.py
@@ -4,7 +4,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (3, 4, 43),
+    "version": (3, 4, 44),
     'blender': (3, 3, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',
diff --git a/io_scene_gltf2/blender/com/gltf2_blender_default.py b/io_scene_gltf2/blender/com/gltf2_blender_default.py
index c3951f4e..13a3bb48 100644
--- a/io_scene_gltf2/blender/com/gltf2_blender_default.py
+++ b/io_scene_gltf2/blender/com/gltf2_blender_default.py
@@ -3,4 +3,12 @@
 
 BLENDER_IOR = 1.45
 BLENDER_SPECULAR = 0.5
-BLENDER_SPECULAR_TINT = 0.0
\ No newline at end of file
+BLENDER_SPECULAR_TINT = 0.0
+
+
+SPECIAL_ATTRIBUTES = {
+    ".select_vert",
+    ".select_edge",
+    ".select_poly",
+    "material_index"
+    }
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py
index f823d176..2d7266e9 100644
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_primitives_extract.py
@@ -9,6 +9,7 @@ from ...io.com.gltf2_io_debug import print_console
 from io_scene_gltf2.blender.exp import gltf2_blender_gather_skins
 from io_scene_gltf2.io.com import gltf2_io_constants
 from io_scene_gltf2.blender.com import gltf2_blender_conversion
+from io_scene_gltf2.blender.com import gltf2_blender_default
 
 
 def extract_primitives(blender_mesh, uuid_for_skined_data, blender_vertex_groups, modifiers, export_settings):
@@ -137,6 +138,11 @@ class PrimitiveCreator:
     def define_attributes(self):
         # Manage attributes + COLOR_0
         for blender_attribute_index, blender_attribute in enumerate(self.blender_mesh.attributes):
+
+            # Excluse special attributes (used internally by Blender)
+            if blender_attribute.name in gltf2_blender_default.SPECIAL_ATTRIBUTES:
+                continue
+
             attr = {}
             attr['blender_attribute_index'] = blender_attribute_index
             attr['blender_name'] = blender_attribute.name