This FBX file is corrupted as far as I can investigate (way too big to make a real investigation of its structure). At the point it errors, it has 384318 'smooth poly' items, for only 154616 polygons… not much to be done I’m afraid, except to ignore invalid data (yeah, even more cluttering of our code :( ).

Thanks for the confirmation.
I tested this fbx in Houdini. And it imports it ok.

Tested in Modo. Modo import the mesh too.

Yeah, easy to import… but there should not be 384318 smooth data for 154616 polygons, means the exporter is not working correctly.

As usual with FBX, it hides some real error under the carpet, and then breaks on things absolutely harmless…

ahhh... ugly fbx...

Thank you!