Blender Git Loki

mesh_validate code for bmesh (i.e. polys/loops).

Everything seems to work well (many tests making random changes over various meshes went good), but the code is a bit complex and hard to follow, due to the various possibilities of invalid poly/loop combinations�?� Code also makes more operations than previous tri/quad faces version (hence is a bit slower), but I don�??t think we can do otherwise, it�??s just the price for bmesh flexibility. ;)

Note: added the py script I used to make the tests, under source/tests/...