学习DIRECTX时改写的关于点光源的东西 原理很简单，但是值得参考！-DIRECTX when learning to rewrite on the principle of point light source is very simple thing, but it is also useful!

d3d开发的一款灯管设置程序，你可以在其中找到最基本的设置函数，初学者必备。-d3d development of a lamp setup program, you can find the most basic set functions, essential for beginners.