mesh2ovoxel and ovoxel2mesh test

[ydayda]

I test these scripts:https://github.com/microsoft/TRELLIS.2/tree/main/o-voxel/examples.
(1) rec_mesh is much bigger than scale mesh.
(2) if export to glb, loss hanppened!
Is it right?

EDIT: seems caused by this, too slow! if skip to the simplify! Maybe the simplify has some bugs!