Splitting the sequence of vertices into chunks to create polygons

To build polygons using the existing list of vertices, we need to split this list into chunks of the required length. One chunk for each polygon. For a good mesh topology, square polygons are usually built, so the list of vertices is best divided into blocks of 4 vertices.

Read more: https://b3d.interplanety.org/en/splitting-the-sequence-of-vertices-into-chunks-to-create-polygons/