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正在学习SDF算法的原理，觉得真是很厉害的工具!
一个简单的例子： shader_04.vl
RayMarch可以支持Material，因而也可以编写shader，这也增加了很多可能性。
更新一下源文件： shader_04.vl
支持Fresnel的材质写法
更新源文件：
shader_04.vl
