papervision，將 TriangleMesh3D 一開二 March 24, 2010July 2, 2022 http://www.unitzeroone.com/blog/2008/03/17/papervision3d-cut-any-mesh-into-2-new-meshes-source/ http://www.unitzeroone.com/ btw，佢個 blog 都幾正~
