1 files changed, 64 insertions, 0 deletions
diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_generate_extras.py b/io_scene_gltf2/blender/exp/gltf2_blender_generate_extras.py
new file mode 100755
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+++ b/io_scene_gltf2/blender/exp/gltf2_blender_generate_extras.py
@@ -0,0 +1,64 @@
+# Copyright 2018 The glTF-Blender-IO authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import bpy
+from io_scene_gltf2.blender.com import gltf2_blender_json
+
+
+def generate_extras(blender_element):
+    """Filter and create a custom property, which is stored in the glTF extra field."""
+    if not blender_element:
+        return None
+
+    extras = {}
+
+    # Custom properties, which are in most cases present and should not be exported.
+    black_list = ['cycles', 'cycles_visibility', 'cycles_curves', '_RNA_UI']
+
+    count = 0
+    for custom_property in blender_element.keys():
+        if custom_property in black_list:
+            continue
+
+        value = blender_element[custom_property]
+
+        add_value = False
+
+        if isinstance(value, bpy.types.ID):
+            add_value = True
+
+        if isinstance(value, str):
+            add_value = True
+
+        if isinstance(value, (int, float)):
+            add_value = True
+
+        if hasattr(value, "to_list"):
+            value = value.to_list()
+            add_value = True
+
+        if hasattr(value, "to_dict"):
+            value = value.to_dict()
+            add_value = gltf2_blender_json.is_json_convertible(value)
+
+        if add_value:
+            extras[custom_property] = value
+            count += 1
+
+    if count == 0:
+        return None
+
+    return extras
+