实现soft shadow的源代码，国外的研究人员做的，比较底层，很值得学习。-achieve soft shadow of the source code, the foreign staff of the study, compared the bottom, is worth learning.

Variance Shadow Maps 实时软阴影程序代码demo-Variance Shadow Maps in real-time soft shadow demo code

通过光线追踪的方法，将一个纯数学的模型（球体中心坐标，颜色rgb值）等等转换为一个三维的图片，而且能够模拟光照效果/柔和阴影/景深等等，且带有抗锯齿功能-Through using the method of ray tracing, the model is a purely mathematical (center of sphere coordinates, color RGB value) and converted to a 3D picture, and can simulate t