UE4 DitherTemporalAA function

Technical & Engine Help Unreal Engine Help
#1

Hi guys :slight_smile:

Can some one explain what exactly happened in those part of DitherTemporalAA function?
Those vec2 putted inside ScreenAlignedPixelToPixelUVs, honestly, doesnt make any sense for me :thinking:

dither_t_aa
dither_t_aa1226×359 49.2 KB

#2

That just returns the pixel position in screenspace I think.

So the left most pixel would return 0 and the right most pixel would return your screen width (in fullscreen at least)