In the "Fitness building with lofted roofs" Bricsys TV tutorial at about time 5:30 there is an operation which seems to be an extrude to limits of the rear wall of the example building up to the inner surface of the lofted roof. I can extrude to limits for the side walls just fine. When I try the same for the rear wall, I get "Failed to create limited extrusion for some of the selected entities." I suspect that's because I'm not selecting both inner faces of the roof as limits, but I can't seem to make that happen.
I can finish the wall and continue with the tutorial by the tried and true method of extruding it high up, subtracting a copy of the roof, separating and then deleting the extra piece of the wall. Not nearly as elegant, though. Any ideas?
I do enjoy the tutorials -- good exercises and I always learn something.