Bonjour Marcel, yes N-gons usually work well with Modo, there are quite a few people that use MoI to export N-gon meshes to Modo, most often with the .lwo file format.

However, just n-gons themselves (as opposed to Quads & Triangles) won't particularly speed up your renderings, that part will be roughly the same between those 2 options (whether you set Output:N-gons or Output:Quads & Triangles). Render speed is more about the density of the vertices that make up all your polygons rather than if they are n-gons or triangles.

However, MoI's mesher does some work especially on mechanical parts to make a good looking mesh with not quite as much overall polygon density, especially on things with regular curvature such as cylinders and spheres. This is kind of a separate thing from using n-gons or not. But anyway, here are a couple of messages on one person's experience with that:
http://news2.mcneel.com/scripts/dnewsweb.exe?cmd=article&group=rhino&item=283096
http://news2.mcneel.com/scripts/dnewsweb.exe?cmd=article&group=rhino&item=283169
A quote from the above: "I made an ultra detailed Roman catapult, at 450k poly's it's just too heavy to sell, really, and reducing further wrecks the fine quality, but MOI can do it in half the polys which is great and same quality."


But I guess if you are using T-splines you are probably doing some irregular types of shapes rather than mechanical shapes, so it is possible that you may not see quite as large of a difference as you would with regular shaped things. Certainly worth a try though!


> One curiuous thing I noticed, just trying Moi and importing
> a file from rhino, was the handle of nurbs objects from
> Tsplines... seems to be imported "before" trhe translation in
> current nurbs, but I have to test more intensively...

I seem to remember that you may need to switch to a certain T-splines mode for the plain NURBS surfaces to be available in the file... Something like that anyway. You'll need to do whatever you would normally do to be able to send the T-spline model to someone else with just plain Rhino that does not have the T-splines plugin.

Some discussion on that in this thread, maybe it will help:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2359.1
http://moi3d.com/forum/index.php?webtag=MOI&msg=2359.8

Otherwise you may need to ask the T-splines people what you need to do to make the T-spline object stored as a regular NURBS object (rather than as special data that only their plug-in knows about) that other programs can read.

- Michael