I have a mesh that I'm trying to split along a polyline, but it doesn't work. I did a few experiments and found that the mesh will only split along a line. I did a two-segment polyline, and the mesh only split along one of the line segments. I tried the same thing with a slab and it had the same weird problem. Aren't these objects supposed to split along a polyline path? I swear I saw somebody split site terrain in an effort to show roads and curbing.