I’m trying to split this polysurface in half using the _Split command and a cutting plane. The split succeeds in Rhino 6, but it fails in Rhino 7 WIP.
Attached is a sample part (baked from a Grasshopper script) that shows the failure.
I’ve tried a bunch of different things to try and narrow down the problem and I think it has to do with four of the surfaces having a boundary edge along the splitting plane. If I explode the part and only split the three crotch surfaces, then the split succeeds. Joining the three crotch surfaces into a single polysurface and splitting the resulting polysurface also succeeds. The split only fails if all surfaces are joined into a single polysurface then split using the splitting plane.
This happened in both the August 25th build and the September 1st build of Rhino 7 WIP.
SplitTest.3dm (704.7 KB)