This project forked from haili1234/heat_distortion_refraction
基于URP管线，热空气扭曲。支持半透明物体。
基于URP管线，热空气扭曲。支持半透明物体。
在Unity的Build-in渲染管线下可以在合适的时机使用GrabPass截图，但是在URP管线下没有GrabPass了，想要获取截图只有_CameraColorTexture和_CameraOpaqueTexture。
_CameraOpaqueTexture是在不透明通道渲染后截图，所以截不到半透明的物体。
_CameraColorTexture是在半透明通道渲染后和PostProcessing后截图。
所以在PostProcessing渲染通道渲染完成后会有一个_AfterPostProcessTexture的屏幕截图，这个就是正确的屏幕截图了，这时候使用这个截图就可以做出正确的扭曲效果。
效果测试： https://user-images.githubusercontent.com/7518595/123969522-e3104100-d9ea-11eb-8941-f52efbba298f.mp4
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