Hi Paolo,

> If you want a good result in 3d-coat the object
> has to be a single mesh in which each polygon
> has only one point on each vertex (i have got frustrated
> on this)

If you want every polygon to have only a single point shared between all adjacent polygons, you should normally be able to do this by enabling the "Weld vertices along edges" option inside of MoI.

To see that option you need to push the small arrow in the lower-left corner of the Meshing options dialog to open it up to see more options.

With that option enabled, does it give you the kind of output that you need for 3d-coat, or have you been seeing problems with welding enabled on output from MoI?

One other note - if you have constructed a model made up of individual surfaces (like by sweeping, etc..) make sure you use Join before exporting, so that MoI will know about the shared edges between the different surfaces. MoI does some extra work when you have shared edges to ensure that the meshing is "watertight" and has a unified structure along those edges. If you have individual surfaces not joined together, they can get meshed separately and get different vertex structures.

- Michael