Would anybody dare to model a roof similar to the one at the British Museum in Revit?! Or at least as a start, how about a more regular form like a curved funnel? Making the form and attaching a curtain system is no problem. Simple revolved mass > curtain system by face. However, the diagonals are problematic. I tried a curtain panel with a diagonal member... no luck. Any ideas? I'd like to be able to apply a diagrid to any double-curved surface. It's becoming a common structural system, so I imagine there is a way to model it in Revit (no imports, please).