Variable fillet in GH?

I’m happy with this version today. It handles multiple pairs of surfaces, thanks to Andrew Heumann’s FlipLast cluster. (Very useful! Thank you @andheum for that one.)

The pair of zero/one sliders (blue group) allow choice of quadrant for the fillet when the intersecting surfaces overlap. The most difficult part was choosing which piece of each split surface to keep. Splitting is an optional step, after all? (75.8 KB)

This cyan group off the left edge of the canvas is a good demo, by itself.