计算机图形三维变换，基本实现了对称，旋转，投影，三视图，错切图等-It really does pay to be a doctor, with an international survey showing the medical profession is the most trusted, among the most admired and includes the most eligible marriage partners.

shadowmapping算法的实现，点光源在上方，一个球可以围绕一个十二面体旋转，注意阴影的实现-shadowmapping algorithm, point light source at the top, a ball can be rotated around a dodecahedron, pay attention to the realization of the shadow