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import bpy, json
class EmptyProps(bpy.types.PropertyGroup):
pass
bpy.utils.register_class(EmptyProps)
bpy.types.Scene.matlib_categories = bpy.props.CollectionProperty(type=EmptyProps)
cats = []
for cat in bpy.context.scene.matlib_categories:
materials = []
for mat in bpy.data.materials:
if "category" in mat.keys() and mat['category'] == cat.name:
materials.append(mat.name)
cats.append([cat.name, materials])
with open("D:\Blender Foundation\Blender\2.78\scripts\addons\matlib\categories.txt", "w") as f:
f.write(json.dumps(cats, sort_keys=True, indent=4))
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