lookAt( x, y, z ) {

		if ( x.isVector3 ) {

			_target.copy( x );

		} else {

			_target.set( x, y, z );

		}

		this.object.lookAt( _target );

		this._setOrientation();

		return this;

	}
Rotates the camera towards the defined target position.

@param {number|Vector3} x - The x coordinate of the target position or alternatively a vector representing the target position.
@param {number} y - The y coordinate of the target position.
@param {number} z - The z coordinate of the target position.
@return {FirstPersonControls} A reference to this controls.