Hi Marco,

> 1) Is there a Rhino 3d SplitEdge equivalent command in Moi ?

Yes, the Edit > Trim command can be used on an edge in MoI to cut the edge. You don't need to create an isoparm separately, you can use the "Add trim points" option in the Trim command to indicate the spots you want to cut at. So select the edge, run Edit > Trim, then click "Add trim points" and place a point at the desired split location and then right-click to finish the Trim command.


> 2) What are the unwanted lines that i get while in shaded mode, as illustrated by the
> file 05_garbage_lines.jpg ?
> Is there a way to avoid that ?

Those are a display artifact of the realtime display, they are a result of pulling edges and curves towards the eye point to avoid a different and worse artifact of having the edges being partially submerged in the surfaces. See here for more information:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3933.3

There isn't any way currently to avoid that - it's a normal thing that you will see various kinds of display artifacts in the window display because it is focused on doing things quickly so the display is responsive, it's not focused on trying to make a "pixel perfect" display for generating a final illustration since doing that takes a lot more calculation and waiting.

To get a better quality display you should use something that's focused on image quality rather than focused mainly on speed, so something like a rendering program or MoI's export to PDF or AI format should generate a better quality image.

Hope that helps!

- Michael