constructor( start = new Vector3(), end = new Vector3() ) {

		/**
		 * Start of the line segment.
		 *
		 * @type {Vector3}
		 */
		this.start = start;

		/**
		 * End of the line segment.
		 *
		 * @type {Vector3}
		 */
		this.end = end;

	}
Constructs a new line segment.

@param {Vector3} [start=(0,0,0)] - Start of the line segment.
@param {Vector3} [end=(0,0,0)] - End of the line segment.