Function sweep_solid_clipped 

pub fn sweep_solid_clipped(
    tool: &SolidTool,
    motion: &SolidMotion,
    clip: &SweepClip,
) -> Result<BrepSolid, KernelRefusal>

The sweep of tool along motion, where it lies in clip (the caller cuts a workpiece inside that region). A TURN about the clip’s own axis whose two end positions stay outside the clip’s wedge covers the wedge wholly with the tool’s shadow in (ρ, z): that shadow, turned over the wedge, is the sweep there (a convex polyhedron’s shadow is bounded by conic arcs from its edges and straight lines from its faces, so every surface is exact); a turn about that axis whose ends reach the wedge is refused. A screw or turn about the region’s axis whose tool reaches far past the region’s radius sweeps only the tool’s part that can reach it (see trim_to_clip). Any other motion gets the whole sweep (sweep_solid).