Bad Poly, shadows are wrong . in General Houdini Questions Posted May 20, 2014 You geometry is big. I had to scale it to 0.001 to see ortho grid at all. Once scaled down it renders OK. Make sure that you have export scale set correctly in MAX. Thanks for the tip, actually I cant touch the scaling and transform of the mesh , it is part of a complex structure and all camera , character animation all done and passed to me to lighting, I just cant figure out how to solve that shadow problem on the mesh, the mesh I think all its normals are ok , might it be a bug ?