Detecting if a Collada file has been exported with two-sided faces


I’m maintaining a Collada importer and I am wondering if there is a recommended way to detect if a Collada file has been written with “export two-sided faces” enabled.

My task is to set the single/double-sided flag in our own data structures accordingly and be able to correctly convert to e.g. glTF (which has a double-sided material flag in contrast to Collada).

Currently I only see a heuristic to search for lamina faces by comparing indices…


Perhaps also ask in the Khronos Collada forum ?