For years I've been obsessed with trying to model a parabolic roof.  I once got it to sort of work by using the terrain and changing the material, but it wasn't exact. Now that we are up to x12 (or 13?) I wonder if there is some new function that would make this possible, if someone is clever enough, which I am not.  I have built the frame and rafters in the attached model (a tedious task in itself), I just want to skin it with the roof surface (and ideally a ceiling below that follows the parab