@sveltejs/gl/geometry/dodecahedron.mjs

A (very experimental) project to bring WebGL to Svelte

import polyhedron from './polyhedron.mjs';

// adapted from https://github.com/mrdoob/three.js/blob/master/src/geometries/DodecahedronGeometry.js
// MIT licensed https://github.com/mrdoob/three.js/blob/dev/LICENSE

const t = ( 1 + Math.sqrt( 5 ) ) / 2;
const r = 1 / t;

const vertices = [
	// (±1, ±1, ±1)
	-1, -1, -1, -1, -1, +1,
	-1, +1, -1, -1, +1, +1,
	+1, -1, -1, +1, -1, +1,
	+1, +1, -1, +1, +1, +1,

	// (0, ±1/φ, ±φ)
	0, -r, -t, 0, -r, +t,
	0, +r, -t, 0, +r, +t,

	// (±1/φ, ±φ, 0)
	-r, -t, 0, -r, +t, 0,
	+r, -t, 0, +r, +t, 0,

	// (±φ, 0, ±1/φ)
	-t, 0, -r, +t, 0, -r,
	-t, 0, +r, +t, 0, +r
];

const indices = [
	3, 11, 7, 	3, 7, 15, 	3, 15, 13,
	7, 19, 17, 	7, 17, 6, 	7, 6, 15,
	17, 4, 8, 	17, 8, 10, 	17, 10, 6,
	8, 0, 16, 	8, 16, 2, 	8, 2, 10,
	0, 12, 1, 	0, 1, 18, 	0, 18, 16,
	6, 10, 2, 	6, 2, 13, 	6, 13, 15,
	2, 16, 18, 	2, 18, 3, 	2, 3, 13,
	18, 1, 9, 	18, 9, 11, 	18, 11, 3,
	4, 14, 12, 	4, 12, 0, 	4, 0, 8,
	11, 9, 5, 	11, 5, 19, 	11, 19, 7,
	19, 5, 14, 	19, 14, 4, 	19, 4, 17,
	1, 12, 14, 	1, 14, 5, 	1, 5, 9
];

export default function({ subdivisions, shading } = {}) {
	return polyhedron(vertices, indices, subdivisions, shading);
}