Sorry -- I forget the terminology sometimes. I don't have RDS installed on the machine I use for internet access any more.... But, Jim Z did answer the question. Mesh and Vertex are the same in RDS.... Another odd side-effect of converting to Mesh / Vertex is that sometimes the geometry gets mushy -- some things that were crisp and hard-edged in the free-form modeller become a bit squishy. Hard to describe otherwise, but try it and you'll see. I'm sure there are fidelity settings that would take care of that problem, but I haven't found them. (Not that I've used this operation very often.) Good luck. Let us know how this turns out! - Dex.