Highly accidented terrain, two flat area’s on different heights connected by a ramp. Both areas and ramp enclosed by closed loop spline
In PCG Script:
In Spline Sampler, ProjectOntoSurface is checked.
Interior Orientation default (Uniform)
Interior Orientation set to “Follow Curvature” makes no difference
If debug on Difference, the enclosure is indeed empty, but not completely:
The red areas should have been omitted:
Result is that meshes will be placed within the enclosure that should be completely empty
(Spline selected so the boundary is clear)