constructor( radius = 1, theta = 0, y = 0 ) {

		/**
		 * The distance from the origin to a point in the x-z plane.
		 *
		 * @type {number}
		 * @default 1
		 */
		this.radius = radius;

		/**
		 * A counterclockwise angle in the x-z plane measured in radians from the positive z-axis.
		 *
		 * @type {number}
		 * @default 0
		 */
		this.theta = theta;

		/**
		 * The height above the x-z plane.
		 *
		 * @type {number}
		 * @default 0
		 */
		this.y = y;

	}
Constructs a new cylindrical.

@param {number} [radius=1] - The distance from the origin to a point in the x-z plane.
@param {number} [theta=0] - A counterclockwise angle in the x-z plane measured in radians from the positive z-axis.
@param {number} [y=0] - The height above the x-z plane.