thank you siggraph for teaching me so much with every presentation very simple technique for the basis of rendering cracked glass from the last of us part IIpic.twitter.com/gMOTxw0ZMg
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It's that just a texture?
see the attached 
it's just a parallax offset applied to a second sample and then you find the delta
the idea is you are doing a ray intersection against each the piece at that pixel
