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

Extended geographic projections for d3-geo.

// TODO generate on-the-fly to avoid external modification.
var 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(function(face) {
  return face.map(function(i) {
    return octahedron[i];
  });
});