constructor( radius = 1, detail = 0 ) {

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

		const vertices = [
			-1, t, 0, 	1, t, 0, 	-1, - t, 0, 	1, - t, 0,
			0, -1, t, 	0, 1, t,	0, -1, - t, 	0, 1, - t,
			t, 0, -1, 	t, 0, 1, 	- t, 0, -1, 	- t, 0, 1
		];

		const indices = [
			0, 11, 5, 	0, 5, 1, 	0, 1, 7, 	0, 7, 10, 	0, 10, 11,
			1, 5, 9, 	5, 11, 4,	11, 10, 2,	10, 7, 6,	7, 1, 8,
			3, 9, 4, 	3, 4, 2,	3, 2, 6,	3, 6, 8,	3, 8, 9,
			4, 9, 5, 	2, 4, 11,	6, 2, 10,	8, 6, 7,	9, 8, 1
		];

		super( vertices, indices, radius, detail );

		this.type = 'IcosahedronGeometry';

		/**
		 * Holds the constructor parameters that have been
		 * used to generate the geometry. Any modification
		 * after instantiation does not change the geometry.
		 *
		 * @type {Object}
		 */
		this.parameters = {
			radius: radius,
			detail: detail
		};

	}
Constructs a new icosahedron geometry.

@param {number} [radius=1] - Radius of the icosahedron.
@param {number} [detail=0] - Setting this to a value greater than `0` adds vertices making it no longer a icosahedron.