Hi suman,

> I think i make the model in moi and the fold
> in sculptris or Mudbox.

That can work to build a kind of smooth simplified base form in MoI and then add in details in a sculpting program.

For doing that you'll want to adjust some of the mesh settings, use "Divide larger than" to divide up the mesh into small evenly sized bits, and if you're using OBJ format you will probably need to switch the "Output" option to "Output: Quads & Triangles". For some examples see here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=804.26
http://moi3d.com/forum/index.php?webtag=MOI&msg=2833.5


But also Sculptris doesn't really like to work on any kind of imported geometry, there are some limits to how an input mesh into Sculptris must be structured, like not too many edges coming out from a single point and stuff like that, and it also doesn't like some kinds of shapes like things with sharp corners in them. So Sculptris in particular may not work very well for this kind of detailing purpose, it's kind of more oriented towards working with blobby shapes that you start entirely inside of Sculptris instead of really working on imported data. But Mudbox, 3DCoat, or ZBrush are more feasible for this kind of thing.

- Michael