Hmmm...Strange, because you can double-click a procedural terrain and then edit it it the same as normal terrains. I would have thought this too would have been impossible if it was a complicated mathmatical definition. Another questions is that when I try to apply one of the materials that cme with Vue to the procedural terrain it warns me that the mapping mode has to be changed. Do you need to use special materials for this typoe of terrain and if not, why is this question always asked?