oat radius], [param:Integer radialSegments], [param:Boolean closed])</h3>
		<p>
				path — [page:Curve] - 一个由基类[page:Curve]继承而来的3D路径。 Default is a quadratic bezier curve.<br />
				tubularSegments — [page:Integer] - 组成这一管道的分段数，默认值为64。<br />
				radius — [page:Float] - 管道的半径，默认值为1。<br />
				radialSegments — [page:Integer] - 管道横截面的分段数目，默认值为8。<br />
				closed — [page:Boolean] 管道的两