Hi BurrMan,

>> Yeah, but there must have been some type of precursor to that video. He seems to be working on an "all tri's" model? Is there some type of rule about all tri's and subd?

No, the input geometry need to be all quad. If there are triangles in the input, mesh fusion will add an extra sub-d level on it to resolve the topology. If there is a n-gone, it will just not consider the input mesh valid.

Now, the result mesh preview is a procedural mesh, and for some reason, modo shows it triangulated. When you 'freeze' the result, you will only get quads on the final mesh (and few triangle here and there).