random() {

		// Ken Shoemake
		// Uniform random rotations
		// D. Kirk, editor, Graphics Gems III, pages 124-132. Academic Press, New York, 1992.

		const theta1 = 2 * Math.PI * Math.random();
		const theta2 = 2 * Math.PI * Math.random();

		const x0 = Math.random();
		const r1 = Math.sqrt( 1 - x0 );
		const r2 = Math.sqrt( x0 );

		return this.set(
			r1 * Math.sin( theta1 ),
			r1 * Math.cos( theta1 ),
			r2 * Math.sin( theta2 ),
			r2 * Math.cos( theta2 ),
		);

	}
Sets this quaternion to a uniformly random, normalized quaternion.

@return {Quaternion} A reference to this quaternion.