I have a complex profile (think 'crown molding') swept around a complex, closed profile curve. How can I non-destructively (i.e. without converting the object to a mesh) fill the (planar) holes left behind?
Here's a sort of sample of what I'm dealing with:
I need to fill the top and bottom to get something bowl-like. I can't just fiddle with the profile curve because my real sweep curve does not have constant radius and extending the profile will create degenerate geometry.
Note: I did sort-of figure this out; the "Fill Mode" (under Shape) does what I want... but requires that the sweep curve is closed. Since my (complex) sweep curve is symmetrical, I was using a mirror modifier to generate half of it. If I do the mirror manually, I can use Fill Mode, but then I have to be very careful about maintaining the symmetry. So, is there either a way to force symmetry of a closed curve, or some other way to make this work while using a Mirror modifier?