A patch can create geometry in 5 different tessellation levels ranging from full geometry (2*16*16 triangles) down to a single flat quad (2 triangles see Figure 2) for illustration.

• 缀片能够在5个不同的镶嵌水平上建立几何构造，从全几何构造（2*16*16个三角形）到一个四边平板（2个三角形，图2）。