Perf: investigate RT shadow merge and weather shelter / accumulation costs #987

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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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Not examined in the GI pass: c_defer_shadowmerge 2.78 ms, c_weather_shelter 1.68 ms, c_weather_accum 1.37 ms. The weather pair may be able to run less often (every few frames, or only where precipitation or the camera changed).

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). Not examined in the GI pass: `c_defer_shadowmerge` 2.78 ms, `c_weather_shelter` 1.68 ms, `c_weather_accum` 1.37 ms. The weather pair may be able to run less often (every few frames, or only where precipitation or the camera changed).

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sky_line added this to the Slipstream project

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

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sky_line/Slipstream#987

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