d3-geo-polygon/src/polyhedral/octahedron.js

Clipping and geometric operations for spherical polygons.

// TODO generate on-the-fly to avoid external modification.
const octahedron = [
  [0, 90],
  [-90, 0], [0, 0], [90, 0], [180, 0],
  [0, -90]
];

export default [
  [0, 2, 1],
  [0, 3, 2],
  [5, 1, 2],
  [5, 2, 3],
  [0, 1, 4],
  [0, 4, 3],
  [5, 4, 1],
  [5, 3, 4]
].map((face) => face.map((i) => octahedron[i]));