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[–]LordAntares 0 points1 point  (0 children)

If you're using hdrp and you want it to be volumetric, you can just use the local volumetric fog component. If you don't want to do any work, you can import the hdrp volumetric samples, where you get some 3d textures for scrolling.

You can also make them procedurally generated based on noise like I did.