measure(perf): per-component ablation of the TunnelNetwork path; exact worms restored
Round (Codex; reviewed by me against PERF-SAMPLED.md). Revert: voxel.WormNoiseMode / voxel.WormLatticeStep, their storage and their switches are REMOVED. VoxelWormField has one path again, exact Perlin with the N1 short circuit. Kept: bEnableWorms (asset), WormsForceOff (measurement only), the exact block skip (default 0). Ablation instrument: 14 development-only, world-changing force-off bits (voxel.TunnelAblate*), applied on the fused, op-stack/classifier, cached SDF/core and modifier/floor paths. They resolve once per process, are hashed into the generation fingerprint, and are compiled to zero in UE_BUILD_SHIPPING (VoxelDensityAblation.cpp). They are a measurement instrument, never a gameplay or multiplayer switch. Defaults exact: canonical export OBJ b3e5f4c3..9b377, worms-region 311CA42C / 75,482 triangles, capability 20,830 / 10,909, and 841/841 keyed tiles identical to NextHeadStaticTrace_20260913. Static worker seconds saved by removing ONE component (two off runs vs the interleaved all-on 33.06 s; baseline noise 0.27%): tunnel SDF 11.4%, cave warp 10.3%, passage carving 10.1%, landing posts 9.9%, passage structural posts 5.6%, worms 2.4%, native floor 2.2%, origin spine 1.6%, room SDF 1.6%, everything else <= 1.1% Moving (2+2 runs each) confirms the top five at 6.0-11.6%. Tunnel SDF off cuts LOD0 generation p95 104 -> 83 ms: it owns the slow tail. The positive savings sum to 58% of the static total; the other 42% is shared. The rows are not additive. Unexplained: tunnel-core OFF made the static total 2.9x SLOWER (95.5 s) while LOD0 generation got faster (p50 64.7 -> 60.6 ms) and triangles fell. The report blames the changed field, which does not fit; more likely a slow fallback path in coarse tiles. That row is not a cost measurement. Ledger: every Unreal process exited 0 and verified the loaded DLL; two PowerShell parser errors happened before any process started. No crashes or retries. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TaFdXhTdYMkW1xrV6ApT6Y
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// VoxelDensityAblation.cpp
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// Development-only TunnelNetwork ablation controls.
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#include "VoxelDensityAblation.h"
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#include "HAL/IConsoleManager.h"
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#include "Misc/CommandLine.h"
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#include "Misc/Parse.h"
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#include <atomic>
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namespace
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{
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constexpr uint32 UnresolvedMask = 0xFFFFFFFFu;
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std::atomic<uint32> GResolvedMask(UnresolvedMask);
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#if !UE_BUILD_SHIPPING
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int32 GCaveWarp = 0;
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int32 GDetailOps = 0;
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int32 GRoomSDF = 0;
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int32 GTunnelSDF = 0;
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int32 GTunnelCore = 0;
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int32 GPassageCarving = 0;
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int32 GPassageStructuralPosts = 0;
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int32 GNativeFloor = 0;
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int32 GDisturbances = 0;
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int32 GOriginSpine = 0;
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int32 GBoundarySeal = 0;
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int32 GLandingPosts = 0;
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int32 GXYEdgeSeal = 0;
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int32 GPitChimneySDF = 0;
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#define VF_ABLATION_CVAR(Name, Storage) \
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FAutoConsoleVariableRef CVar##Storage( \
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Name, Storage, \
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TEXT("WORLD-CHANGING DEVELOPMENT-ONLY measurement override. Forces this " \
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"TunnelNetwork density stage off; never use as a gameplay switch. " \
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"All peers and regenerated worlds must use the same value. Resolved once " \
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"per process. 0=on, 1=off."), ECVF_Default)
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateCaveWarp"), GCaveWarp);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateDetailOps"), GDetailOps);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateRoomSDF"), GRoomSDF);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateTunnelSDF"), GTunnelSDF);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateTunnelCore"), GTunnelCore);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblatePassageCarving"), GPassageCarving);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblatePassageStructuralPosts"), GPassageStructuralPosts);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateNativeFloor"), GNativeFloor);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateDisturbances"), GDisturbances);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateOriginSpine"), GOriginSpine);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateBoundarySeal"), GBoundarySeal);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateLandingPosts"), GLandingPosts);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblateXYEdgeSeal"), GXYEdgeSeal);
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VF_ABLATION_CVAR(TEXT("voxel.TunnelAblatePitChimneySDF"), GPitChimneySDF);
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#undef VF_ABLATION_CVAR
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uint32 ResolveValue(const TCHAR* Name, int32& Storage)
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{
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int32 Value = Storage;
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FParse::Value(FCommandLine::Get(), Name, Value);
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Storage = Value != 0 ? 1 : 0;
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return Storage != 0 ? 1u : 0u;
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}
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uint32 ResolveMask()
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{
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uint32 Mask = 0;
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateCaveWarp="), GCaveWarp)
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* static_cast<uint32>(VoxelDensityAblation::EStage::CaveWarp);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateDetailOps="), GDetailOps)
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* static_cast<uint32>(VoxelDensityAblation::EStage::DetailOps);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateRoomSDF="), GRoomSDF)
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* static_cast<uint32>(VoxelDensityAblation::EStage::RoomSDF);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateTunnelSDF="), GTunnelSDF)
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* static_cast<uint32>(VoxelDensityAblation::EStage::TunnelSDF);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateTunnelCore="), GTunnelCore)
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* static_cast<uint32>(VoxelDensityAblation::EStage::TunnelCore);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblatePassageCarving="), GPassageCarving)
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* static_cast<uint32>(VoxelDensityAblation::EStage::PassageCarving);
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Mask |= ResolveValue(
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TEXT("voxel.TunnelAblatePassageStructuralPosts="), GPassageStructuralPosts)
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* static_cast<uint32>(VoxelDensityAblation::EStage::PassageStructuralPosts);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateNativeFloor="), GNativeFloor)
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* static_cast<uint32>(VoxelDensityAblation::EStage::NativeFloor);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateDisturbances="), GDisturbances)
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* static_cast<uint32>(VoxelDensityAblation::EStage::Disturbances);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateOriginSpine="), GOriginSpine)
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* static_cast<uint32>(VoxelDensityAblation::EStage::OriginSpine);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateBoundarySeal="), GBoundarySeal)
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* static_cast<uint32>(VoxelDensityAblation::EStage::BoundarySeal);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateLandingPosts="), GLandingPosts)
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* static_cast<uint32>(VoxelDensityAblation::EStage::LandingPosts);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblateXYEdgeSeal="), GXYEdgeSeal)
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* static_cast<uint32>(VoxelDensityAblation::EStage::XYEdgeSeal);
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Mask |= ResolveValue(TEXT("voxel.TunnelAblatePitChimneySDF="), GPitChimneySDF)
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* static_cast<uint32>(VoxelDensityAblation::EStage::PitChimneySDF);
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return Mask;
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}
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#endif
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}
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namespace VoxelDensityAblation
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{
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uint32 GetResolvedMask()
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{
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uint32 Existing = GResolvedMask.load(std::memory_order_acquire);
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if (Existing != UnresolvedMask)
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{
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return Existing;
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}
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#if UE_BUILD_SHIPPING
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constexpr uint32 Resolved = 0;
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#else
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const uint32 Resolved = ResolveMask();
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#endif
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uint32 Expected = UnresolvedMask;
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if (!GResolvedMask.compare_exchange_strong(
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Expected, Resolved, std::memory_order_release, std::memory_order_acquire))
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{
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return Expected;
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}
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UE_LOG(LogTemp, Display,
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TEXT("[VoxelForgeTunnelAblation] resolved mask=0x%08x "
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"(world-changing development measurement overrides; 0=all on)"),
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Resolved);
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return Resolved;
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}
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}
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