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Describe the problem more specifically. Do you see funny black areas around some vertices. If you do, then it's more likely that Silo is incorrectly writing the vertex normal directions in the OBJ file. It may be writing the vertex normals according to the directions of it's face. To get a smooth render result in Modo, the vertex normal must be an average direction of all attached faces. This is a tricky thing, as many programs read the vertex normals in different manners. And not all programs have the tools to rewrite the normal directions. Even Modo does not, but i suggested this to Allen Hastings of Lux and he said it would be a good idea to add that feature (especially wih so many CAD folks using modo now). Time will tell...
jonah
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