set( radius, theta, y ) {

		this.radius = radius;
		this.theta = theta;
		this.y = y;

		return this;

	}
Sets the cylindrical components by copying the given values.

@param {number} radius - The radius.
@param {number} theta - The theta angle.
@param {number} y - The height value.
@return {Cylindrical} A reference to this cylindrical.