pub fn arrange_many(meshes: &[&[Tri]]) -> MultiArrangementExpand description
Conforming arrangement of meshes (N operands) over ONE interner.
Every ORDERED pair of distinct meshes is intersected (segment + coplanar)
exactly as the binary arrange does, and the accumulated constraints
re-triangulate each mesh over the shared interner — so a vertex created on a
shared edge/seam interns to the SAME Vid in every mesh that touches it (full
N-way conformity). This is what lets union_all classify each sub-triangle
against all OTHER solids WITHOUT ever re-meshing an intermediate union (the
pairwise-accumulation step that compounds coplanar T-junctions).