Avatar very noisy for a moment when it goes from occluded to visible #1038

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opened 2026-10-25 03:01:22 +00:00 by sky_line · 0 comments

sky_line commented

2026-10-25 03:01:22 +00:00

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When an avatar quickly passes from occluded (behind something) to visible, it looks very noisy for a moment before it settles.

Seen on the Vulkan renderer with RT GI and shadows. The owner doesn't think it's related to the GI kernel splits (#1031 / #1036); it's still under test.

Likely area: disocclusion. Newly revealed pixels have no valid temporal history, so the GI reservoirs / denoisers and the RT shadow denoiser restart from very few samples. Check what happens on history rejection for disoccluded pixels:

spatial fallback / wider filter until history builds up;
reservoir seeding from neighbours;
the moving-object (rigged) history-rejection path specifically;
whether TAA / FSR / DLSS also rejects there and adds to it.

When an avatar quickly passes from occluded (behind something) to visible, it looks very noisy for a moment before it settles. Seen on the Vulkan renderer with RT GI and shadows. The owner doesn't think it's related to the GI kernel splits (#1031 / #1036); it's still under test. Likely area: disocclusion. Newly revealed pixels have no valid temporal history, so the GI reservoirs / denoisers and the RT shadow denoiser restart from very few samples. Check what happens on history rejection for disoccluded pixels: - spatial fallback / wider filter until history builds up; - reservoir seeding from neighbours; - the moving-object (rigged) history-rejection path specifically; - whether TAA / FSR / DLSS also rejects there and adds to it.

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2026-10-25 03:01:22 +00:00

sky_line added this to the Slipstream project

2026-10-25 03:01:22 +00:00

sky_line referenced this issue

2026-10-25 22:07:41 +00:00

GI noise near moving lights (point lights, probably projectors): worst at half GI resolution, colourful under DLSS #1087

sky_line referenced this issue from a commit

2026-10-26 00:26:21 +00:00