Also Pilou, I would recommend dividing to a smaller and finer level of polygons when you export from MoI as I showed in that previous message. To do that, use the "Divide larger than" setting and also switch the dropdown to "All" to apply it to all surfaces, both planar and curved.

You will probably want to divide it to a pretty fine level in MoI first because that will help to preserve more of the curved shape of the object, since when MoI adds polygons each new point added will be along the true original NURBS surface. Then you may want to subdivide perhaps just one time in Zbrush with the smooth option off.

If you make a much rougher version out of MoI and then try to subdivide in ZBrush with smoothing off, the original rough polygon structure will be more apparent in your model.

- Michael