Yesterday, 03:47 AM
Mesh winding order correction has no analytical solution and is based on heuristics. These heuristics try to fix winding order with various best-estimate criteria, but given the nature of input, may fail. Since changes to winding order will change how the heuristics process the mesh, successive attempts to fix winding order on a sufficiently convoluted mesh may produce different results. In your case by chance it took 3 attempts before the heuristics deemed the mesh winding order clean.