Thanks again for the info and the SciPy reminder! We use SciPy at work, as well. I've spent a few months speeding up our production code and a large part of that was removing certain Numpy and SciPy calls. :smile: (Fine print: and mostly replacing them with low-level Numba code.)

I'll see if I can figure out where Apollo's non-manifold bits are located. I think lashes would be fairly easy because if I "cut" the mesh along the offending edges, the main part would still remain connected. Ruffles in a garment that go all around would be much trickier. Probably not worth trying to support in the first version, but it's an interesting problem to think about.

-- I'm not mad at you, just Westphalian.