Whilst 3DSOM Pro can carve away, it can only do so using what could be imagined as a virtual guillotine. This is very good for straight edges and cubes, but when presented with a cylindrical object can result in square sides rather than round.
The solution is to provide 3DSOM Pro with additional images, taken at various angles, around the cylindrical shape. Whilst 3DSOM Pro will continue to create the wireframe by slicing off straight edges, the number of straight edges may be increased to the point when the cylindrical shape is produced.
Please note: when viewed as a flat-shaded model, the cylinder can be seen to have edges created as 3DSOM Pro carved away at the surface. Once a texture has been added to such models and the model is viewed with it's texture in place, then these small imperfections will not be visible under normal conditions.