BTW the triangles are doubled sided faces, so normals going both ways. Worked fine previously. I am clueless why it's not working now. I even re-set up the other set of tris that worked, and they still work. So I recreated the one above, still no luck.


EDIT: here is documentation on problem. So it is probably related to double sided faces, but it doesnt make sense that it worked perfectly fine for other.


EDIT2:UPDATE:
I have tried using tris with just one face, and still not getting collision and getting interpenetration error.