several things
- same vertex count
= (v0...v19)
- edge list has same vertex indices to build each edge
= [[v0,v1],...[v10,v11],[v18,v19]]
- same vertices build the polygon list
= [[v14,v15,v7,v4],...[v7,v6,v18,v19]
several things
= (v0...v19)
= [[v0,v1],...[v10,v11],[v18,v19]]
= [[v14,v15,v7,v4],...[v7,v6,v18,v19]