constructor( center = new Vector3(), radius = -1 ) {

		/**
		 * This flag can be used for type testing.
		 *
		 * @type {boolean}
		 * @readonly
		 * @default true
		 */
		this.isSphere = true;

		/**
		 * The center of the sphere
		 *
		 * @type {Vector3}
		 */
		this.center = center;

		/**
		 * The radius of the sphere.
		 *
		 * @type {number}
		 */
		this.radius = radius;

	}
Constructs a new sphere.

@param {Vector3} [center=(0,0,0)] - The center of the sphere
@param {number} [radius=-1] - The radius of the sphere.