Hi Abhay, what rendering program are you using?

My first guess would be that your rendering program isn't really set up to deal with n-gons (polygons with more than 3 or 4 sides).

When you export from MoI try changing from Output: N-gons to Output: Quads & Triangles and see if that makes any difference.

I could also give you some more help if you can send me your .3dm or .obj files, either post them here or e-mail them to me at moi@moi3d.com .

- Michael