Cluster LOD 2b: ray tracing for cluster cuts -- CLAS / partitioned TLAS, per-cut BLAS fallback #748

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opened 2026-10-13 01:57:40 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-13 01:57:40 +00:00

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Part of #642. Wave 2.

Newest path: NV cluster acceleration structures + partitioned TLAS (#296, #581), so cut changes are cheap.
Fallback: per-cut BLAS with its own coarser RT tolerance and hysteresis.
Measure on first-generation RT cards; if this can't be made decent there, the old controller stays the RT path for them (owner decision).

Rules for this work (all sub-tickets):

Behind RenderVKClusterLOD (default off). With it off, the existing rigged LOD controller (#561 / #613) and every current path are untouched.
Newest path first, chosen by extension presence; every slower path is an additive fallback, forceable on the newest card via RenderVKClusterForceTier.
Failures never crash: a missing page / failed allocation falls back to the coarser parent cut; no unbounded growth (fixed pools, byte budgets, live/cap/peak stats).

Part of #642. **Wave 2.** - Newest path: NV cluster acceleration structures + partitioned TLAS (#296, #581), so cut changes are cheap. - Fallback: per-cut BLAS with its own coarser RT tolerance and hysteresis. - Measure on first-generation RT cards; if this can't be made decent there, the old controller stays the RT path for them (owner decision). **Rules for this work (all sub-tickets):** - Behind `RenderVKClusterLOD` (default off). With it off, the existing rigged LOD controller (#561 / #613) and every current path are untouched. - Newest path first, chosen by extension presence; every slower path is an additive fallback, forceable on the newest card via `RenderVKClusterForceTier`. - Failures never crash: a missing page / failed allocation falls back to the coarser parent cut; no unbounded growth (fixed pools, byte budgets, live/cap/peak stats).

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