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
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