GI: skip the visibility ray for temporal reservoir picks unless the segment crosses a change sphere #985

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opened 2026-10-23 18:07:42 +00:00 by sky_line · 0 comments

sky_line commented

2026-10-23 18:07:42 +00:00

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About 30% of picks are temporal. Their visibility ray could be skipped unless the segment crosses this frame's change spheres. About 0.3-0.5 ms.

Risk: leaks from moving avatars or doors that aren't in the change spheres. Medium effort.

From the 2026-10-23 GI performance pass. Baseline: RTX 5090, 4K, DLSS Ultra Performance (1280x720 render), GI at full render resolution, GI 3 + cache, ReSTIR DI 3, emissive on: GPU 30.9 ms/frame (GPU-bound), async deferred lighting 20.1 ms, `c_gi_trace` 12.7 ms (883k rays/frame). About 30% of picks are temporal. Their visibility ray could be skipped unless the segment crosses this frame's change spheres. About 0.3-0.5 ms. Risk: leaks from moving avatars or doors that aren't in the change spheres. Medium effort.

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2026-10-23 18:07:42 +00:00

sky_line added this to the Slipstream project

2026-10-23 18:07:42 +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 self-assigned this

2026-10-26 02:58:24 +00:00