What is sobol (cell 2D, cell3D, float) and how does it work.

Hi I just saw something like this

https://forums.unrealengine.com/filedata/fetch?filedataid=125793&type=thumb

and I don’t know what it is, what it does. I’m just asking out of curiosity, so that maybe I can use it if I will need to instead of thinking how to do something for few hours.

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im interested too.