[4.4.1 放样体](4.4.1%E6%94%BE%E6%A0%B7%E4%BD%93.md) [4.4.2旋转体](4.4.2%E6%97%8B%E8%BD%AC%E4%BD%93.md) [4.4.3拉伸体](4.4.3%E6%8B%89%E4%BC%B8%E4%BD%93.md)