public boolean equals(double x, double y, double z)
	{
		return (this.x >= x - Util.EPSILON && this.x <= x + Util.EPSILON
				&& this.y >= y - Util.EPSILON && this.y <= y + Util.EPSILON
				&& this.z >= z - Util.EPSILON && this.z <= z + Util.EPSILON);
	}