In the attached trying to Split the cyan/red polysurface blocks with the spiral surface fails for the red ones but succeeds for the cyan. (V6) Yes, it’s pretty far from the origin, but moving it closer doesn’t seem to help. A complete intersection is not found… I can’t find any reason so far. Testing in the WIP, the middle red one does actually split but the upper red one does not…
Hi Mitch - I see that, thanks - I guess the upper box vertical edges fall just on the knotline is one suspicious circumstance… if I move the surface points just a little it all works.