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This PR combines two changes.
I doubt we need the second one. The previous depth is off by at most 1 pixel because jitter stays within +-0.5 pixel per frame. TRAA's disocclusion test already tolerates that:
So it seems the suggested code does not change the existing history decision. I would say we only fix this if there is a clear visible improvement. |
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Closing in favor of #35313. |
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TRAA currently replaces an existing camera view offset and regenerates custom projection matrices while applying jitter. Preserve the camera's projection by translating in clip space, restore it after rendering, and ignore cleanup when no jitter was applied. Also account for the previous/current projection jitter difference when sampling depth history, since velocity excludes jitter while the depth buffer includes it.
Extracted from #35228. The history-copy optimization remains separate.
Live Demo Links:
https://raw.githack.com/bhouston/three.js/traa-projection-history-fix/examples/webgpu_postprocessing_traa.html
webgpu_postprocessing_traamodified to callcamera.setViewOffset( 2560, 1440, 640, 360, 1280, 720 )(a 2× zoom into the center). Before, TRAA discards the view offset:Validation: