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@froyok nice write-up! I wonder if it might be worth it to copy the back-buffer before the first person hands/weapon are/is drawn, to avoid it bleeding into the refraction. (obviously this can cause mayor complications, depending on your setup)

@logicalerror As far I could saw, many game already render the weapon early on during the depth prepass to discard all the pixels that will be covered by the hands.
So not sure there is any point in the rendering pipeline to fill something else in there.
Discarding samples based on near depth seems easier I feel.