at( t, target ) {

		return target.copy( this.origin ).addScaledVector( this.direction, t );

	}
Returns a vector that is located at a given distance along this ray.

@param {number} t - The distance along the ray to retrieve a position for.
@param {Vector3} target - The target vector that is used to store the method's result.
@return {Vector3} A position on the ray.