The page procedurally makes strange quads. most of which are 'real' quads, but some degenerate into triangles or quads with top or bottom edges which are twice as wide. The quads naturally can be subdivided into triangle pairs and the double wide edged quads subdivide in to three triangles. It's a simple matter of doing the work to set up these subdivisions and make the triangles, which subdivide into three corner quads which group around my points to make funny little polygons...