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src/b/l/blenderpython-HEAD/scripts/addons_extern/render_appleseed/ui/materials.py   blenderpython(Download)
def unregister():
    bpy.types.MATERIAL_PT_context_material.COMPAT_ENGINES.remove( 'APPLESEED_RENDER')
    bpy.types.MATERIAL_PT_custom_props.COMPAT_ENGINES.remove( 'APPLESEED_RENDER')