Fr0zkaandClaude Opus 5
f2044135ea
The code contradicted its own documentation. VoxelMarchingCubesMesher.h:150 says to leave
the optional 8^3-block refinement DISABLED in streaming, "repeating a proof on ..." --
and VoxelWorld.cpp forced `Mesher->bUseBlockEarlyOut = true` regardless.
It is now off by default, behind `voxel.UseBlockEarlyOut` (CVar + command line), so the
capability stays available for the focused diagnostics where it was measured to help.
⚠️ THE HEADLINE NUMBER DOES NOT REPRODUCE, AND I AM NOT CLAIMING IT
Sol's second pass read a 3.5x from the attribution table:
classifier disabled 587.991 ms
classifier enabled 2,056.596 ms
My own clean A/B on this flag, quiet machine, 3 runs each:
nested OFF 0.597 / 0.613 / 0.607 s mean 0.606
nested ON 0.637 / 0.599 / 0.605 s mean 0.614
Identical within noise.
So either the 2,056 ms control exercised more than this flag does, or the 3.5x lives on
a path the 128^3 export does not take. PERF-ATTRIBUTION.md describes that figure as "the
separate classifier control", which is not obviously the same lever. Until the game-path
A/B is run, treat the 3.5x as UNCONFIRMED.
What this commit is worth on its own: the code now does what its documentation says, the
behaviour is switchable rather than hardcoded, and geometry is unchanged --
SHA-256 b3e5f4c3..9b377 identical with the flag on, off, and against bb8ec51.
⚠️ An earlier measurement pass in this round was contaminated: a local llama-server was
using 5 GB and competing for cores. Those runs came out 0.67-0.78 s with the on/off
ranges overlapping. Discarded and re-measured on a quiet machine; only the clean numbers
above are reported. Worth recording as a reminder that the machine is part of the
instrument.
NOT DONE -- the round was OOM-killed partway (same llama-server):
- the three-way outer-classifier A/B (no outer / current+discarded validation / ⭐ outer
with validation samples REUSED as the mesher core grid). That third mode is the
interesting one: exact validation currently costs 33^3 = 35,937 density calls whose
results are then DISCARDED, while the mesher then fills 35^3 = 42,875. A successful
uniform verdict saves at most 16.18%, and a Mixed verdict saves nothing.
- game-path measurement of any of it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012aheo2crrZmHuYtPpdY2Cb