Enhance the speed of the computer in process graphics by upgrade the projection matrix and Visible-surface detection, and let the graphics achieved show the problem that user care most.

• 对投影矩阵和消隐算法等进行了改进，使计算机处理图形的速度得到了很大的提高，同时使最后得到的图形更能准确的显示用户所关心的问题。