PxClothFabricCreate asserts in PhysX-3.3.1 (17938824) when inv masses are all 0.0

I noticed that PxClothFabricCreate will fizzle and die if you pass it a PxClothMeshDesc whose inverse masses are all 0.0.

Calling isValid() on the PxClothMeshDesc before hand returns true. Should it?

I screwed up my calculation for the cloth anchor points, I’m sure it won’t be the last time this happens, is there a recommended check I can do before trying to create the fabric so I can bubble up a useful error? For now I’m just traversing all of my inv masses.