I have tried everything. I have these 8 puzzle pieces that currently cost 900 dollars I used rhino to model them and i cant figure how to shell these polysurfaces! i moved it into solid works and only 3 of the 8 pieces are recognized as solids and can be shelled there. It would be great if someone could explain how to do this or just do it for me. I already tried Meshlab but i can figure that out.