It's not a trick, if you're wondering. There actually is something to see.
this post was submitted on 18 Dec 2023
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woahdude
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The actual concept isn’t difficult to implement (z+1? Shift it over a pixel and fill with an appropriate noise/blur function, then shift back for z-1)
the hard part is building the depth map, especially when you’re using higher resolution. You’re essentially doing 3D rendering at that point