The OBJ exporter that comes with 3dmax is very buggy. It messes completely the vertex normals ( specially if you export box objects ). Avoid it. Better use other format like ASE, FBX or 3DS... For xNormal better use the SBM exporter because will be the fastest to load.
I've had some issues with losing smoothing groups and transferring uv's recently, so I was wondering if this plugin (or any other) can preserve the vert index? For example, I had a max file with smoothing groups from which I exported an .obj to unwrap. Somewhere along the line the smoothing groups got stripped and I…