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fix(groom,build): limit thin coats' card growth (#1595); one oneTBB per executable (#1575) - #1609
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drsnuggles8 merged 30 commits intoOct 13, 2026
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… per link (#1575) Every USD-enabled executable linked two static oneTBB runtimes: the 2022.2 copy OpenUSD.cmake built for USD and vcpkg's 2023.1 (OpenVDB's). USD's archive came first on the link line, so OpenVDB, compiled against 2023.1 headers, ran on 2022.2's internals, and /FORCE:MULTIPLE would have hidden any clash. - USD's own oneTBB ExternalProject is gone. USD compiles against vcpkg's oneTBB (TBB_DIR from find_package(TBB ... GLOBAL)), and the engine links TBB::tbb. The new `usd` manifest feature installs tbb whenever OLO_WITH_USD is on. The cache key now names the oneTBB version, so every box rebuilds USD once. - USD v25.11 does not build against oneTBB 2023.1 as shipped: its workTBB headers test TBB_INTERFACE_VERSION_MAJOR without including tbb/version.h, which 2022.2's blocked_range.h used to bring in. patch-usd-tbb-version.cmake adds the include. - OLO_USD_INSTALL_DIR is refused at configure: a prebuilt install bundles its own oneTBB. - cmake/OneTbbGuard.cmake fails the build before OloEngine compiles if any executable or shared library links more than one tbb12 archive. It reads the generated link line per configuration from the CMake File API codemodel. - UsdStageImportTest opens a real .usda through the importer registry; no test imported a stage before. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
OpenUSD's ExternalProject built with a bare `cmake --build --parallel`. A bare flag means the native tool's default (every core for MSBuild, cores + 2 for Ninja) and outranks CMAKE_BUILD_PARALLEL_LEVEL, which build-lock.ps1 exports with its memory-aware job count. So the heaviest one-off build in the tree ran uncapped under the lock that exists to bound it. Without the flag the nested build inherits the lock's value. Found while rebuilding USD for #1575. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An ExternalProject inherits the generator but not the compilers. A cold USD build from a Ninja tree (dev-cached, clangcl) therefore configured with whatever compiler PATH offered: LLVM's GNU-style clang++, for which USD takes its non-MSVC path and fails at `'cxxabi.h' file not found` in arch/demangle.cpp. Passing the parent's clang-cl fails too, because USD's compiler defaults treat any Clang as GNU-style (`-Wno-deprecated` reads as `/wd`). A non-Visual-Studio Windows tree now builds USD with the Visual Studio generator, which finds the toolset itself; other platforms get the parent's compilers. The bug was latent: every USD cache so far had been seeded by an msvc-preset tree, and the Ninja trees only ever hit it. #1575's new cache key made a Ninja tree build USD for the first time. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
#1595) PointCoverageGrowth widens a card toward what its members cover as a lock once a pixel spans more than the cook's. The GroomAnimals horses' cards, 9 and 14 strands a card, already cover their strands at 32 m without it (short coat 1.145, long 1.013), so full growth put the short coat at 1.211 of its strands, past the card tier's 1.2 ceiling. The foxes (26-30 strands a card) and the dogs (45-127) fall 4-15% short without it. The stream now carries 1 + reach (growth - 1), where reach is (strands per card - 1) / 31 clamped to 1 (GroomCardCoverageGrowthReach): a card standing for one strand is that strand, and 32 is the lock the growth law was validated on. The reach comes from the base and card curve counts the asset already carries, so no groom is re-cooked and the format is unchanged. Measured (GL, Release, TheCoatKeepsItsCoverageFromNearToFar): short coat 1.167 at 32 m and 1.179 at the hand-over; long coat 1.035 / 1.032; the long coat's hand-over on Deferred, Forward+, Deferred MSAA 4, FSR1 and FSR2 1.026-1.030. Foxes 1.006 / 1.020 at range (were 1.010 / 1.027). The dogs' reach is 1: the Bernese and Samoyed hand-over numbers are identical before and after. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…rowth The shipped ShortCoatHorse and LongCoatHorse grooms were re-encoded to format v5 by 03cd229, which filled every card point's PointCoverageGrowth with 1.0, but were never re-exported. So the live GroomAnimals scene drew horse cards that the evidence never validated: TheCoatKeepsItsCoverageFromNearToFar cooks the same coats at runtime and measures their real growth (width-weighted 2.18 and 1.74). Regenerated with the test's own OLO_GROOM_ANIMALS_EXPORT=1 case. The bindings and the human coat came out byte-identical, and the committed scene already references these groom handles, so GroomAnimals.olo and AssetRegistry.oar are unchanged. Found while measuring #1595. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ees the coat GroomSimulationVisualEvidenceTest drives its motion through RunFrames, which renders from the scene's primary camera, sixty units back. That camera was a default SceneCamera: orthographic, with a -1..1 depth range, so the coat at the origin was outside its frustum. The groom was never submitted, the solver never stepped, and every GroomRenderStats the suite read was left over from the previous editor-camera capture: the simulated arm reported the control arm's zero, the next control arm the simulated arm's one. Five of eight cases failed on master. The camera is now a 45-degree perspective one, and the teleport case moves it with the animal, or the re-seed frame would not draw the coat either. All eight cases pass: the coat moves 130 464 px on every path within its stretch tolerance, and a 100 m teleport re-seeds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
… streaming test #1603 (e9e1e49) prepares a foliage rebuild off the frame and publishes it when it is ready. PreparedImpostorLayerRebuildWaitsForItsOwnGpuUpload still expected the re-baked impostor atlas on the next frame and the resident-budget eviction within two, so it failed on master since that merge. It now waits for both with the fixture's own WaitForPlants, which bounds the wait by time. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…rective (#1575) USD's objects carry /DEFAULTLIB:"tbb12.lib" (tbb12_debug.lib in Debug), and both linkers satisfy it from the full-path TBB::tbb on the link line, so the engine needs no link directory for it: a link.exe probe links with the full path and fails LNK1104 without it. vcpkg's Debug oneTBB keeps the teardown assert USD's own build compiled out; the Debug test binary exits 0 after a stage import and the OpenVDB imports. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…e that makes it The guard wrote a File API query file during configure, but CMake reads query files before it configures, so a fresh tree's first generate wrote no reply. A configure-dependency marker made Ninja regenerate once to answer it; the Visual Studio generator's ZERO_CHECK ignored the missing marker, and a fresh msvc tree's first build failed with "no File API reply". cmake_file_api(QUERY ...) (CMake 3.27) registers the query during configure and answers it at the end of the same generate, on every generator, so the marker is gone. Checked from a cleared File API state on dev-cached (8 binaries) and msvc (9), with the negative control (USD's old tbb12.lib linked beside vcpkg's) still failing the build. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
AGroomAndALawnLeaveNoPooledFramebufferBehind asserts that the groom pass drew before it checks the pass's pooled framebuffer. The fixture's primary camera is a default SceneCamera, orthographic with a -1..1 depth range, so from z = 6 the tuft at z = 3 was outside its frustum and never submitted. The case passed only after another fixture had left the renderer drawing it anyway, and failed alone and inside its own suite. The case now gives the camera a perspective projection (the other ten cases' accounting is left as it was) and ticks until the tuft and the lawn, both admitted asynchronously, have drawn, bounded at 30 s. 11/11 pass, alone and as a suite. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A default SceneCamera is orthographic with a -1..1 depth range, so a fixture camera that does not set a projection culls a subject a few units away. Two fixtures were red on master for it; the postmortem records how the symptom looked (stats that follow the previous arm, a test that passes only after others) and how to tell. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…#1595) GroomAnimalsAcceptanceEvidenceTest's ladder-on/off crops for both horses at every stop and the long coat's hand-over on Deferred, Forward+, Deferred MSAA 4, FSR1 and FSR2, and FoxCoatEvidenceTest's ladder frames, all rendered by the branch's Release build. Short coat at 32 m: 1.167 of its strands (was 1.211). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…y stepping Re-captured after the fixture's runtime camera was made perspective: the simulated frames now show the coat moved by the solver (130 464 px from the control on every path) instead of the groomed rest pose. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…names oneTBB's core library is tbb12 / tbb12_debug only on Windows; elsewhere it is libtbb / libtbb_debug (.a, .so.12, .12.dylib). The guard matched only the Windows names, so on Linux or macOS it checked nothing and still reported every binary as linking at most one oneTBB. Checked against both platforms' names, versioned shared objects and the tbbmalloc / tbbbind libraries it must ignore. From self-review. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
… serially From self-review of the #1575 change: - The USD cache key named oneTBB's major.minor only, so a patch bump would have reused a usd_m compiled against other headers. It now names the full version. - The Visual Studio generator a Ninja tree builds USD with is a cache variable, OLO_USD_VS_GENERATOR, defaulting to the msvc preset's. - Dropping the bare --parallel let the nested build take build-lock.ps1's job count, but outside the lock MSBuild then built USD's projects one at a time. build-usd-config.cmake decides at build time: the lock's CMAKE_BUILD_PARALLEL_LEVEL when it is set, the physical core count otherwise. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The memory-accounting groom case compared the pools on the frame the tuft and lawn were first admitted; every other check in the case runs after usePath's drain. It now drains the same kDrainFrames first. From self-review. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…es in size asset-import-usd-alembic.md was already over the 10 KB guide limit and #1575 grew it. The oneTBB section, the Debug-assert note and the toolchain gotcha now live in usd-onetbb-and-build-toolchain.md with the review's corrections (the guard's non-Windows names, the full-version cache key, the build-time job count), and the old guide points at it; it ends smaller than on master. groom-card-coverage.md's rule 8a is trimmed back under 10 KB. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…he growth reach (#1595) Its fixture cooks 2500 cards from 12000 strands (4.8 a card), a reach of 0.12, so its card tier now draws close to its cooked width. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…an unversioned oneTBB From the second self-review: - USD compiles every project with /MP, so passing the job count to MSBuild as /m:N ran N projects each starting a compiler per core. Under a Visual Studio generator build-usd-config.cmake now builds one project at a time with CL_MPCount=N (the /MP count MSBuild hands cl), and /nodeReuse:false so no MSBuild node keeps handles in the shared cache after the build. - The core-count fallback is validated, then the logical count, then a loud error. - An empty TBB_VERSION is a configure error instead of a cache key of `-tbb`. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…th does The memory-accounting groom case now asserts that the tuft and the lawn drew on the frame the wait met that condition, then drains kDrainFrames + 2 frames, the same as usePath gives every other check. From the second self-review. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
asset-import-usd-alembic.md was 16 KB on master. The oneTBB material, the USD toolchain and job count, the shared-cache section and the /WHOLEARCHIVE gotcha now live in openusd-build-and-link.md (renamed from the earlier usd-onetbb-and-build-toolchain.md); the importer guide keeps pointers and both are about 10 KB. The engine's link comment and build-trees-and-windows-asan point at the new section. It also notes that a key change leaves the old cache for deletion by hand, and that changing OLO_USD_VS_GENERATOR on a partial cache needs its usd-build deleted. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ard+ (#1595) TheCoatKeepsItsCoverageFromNearToFar measured the other render paths on the long coat only, but the short coat is the one whose card growth crossed the 1.2 ceiling. Its hand-over and 32 m cells now run on Deferred and Forward+ too (MSAA and the upscalers stay the long coat's): 1.169 / 1.161 on Deferred, 1.168 / 1.160 on Forward+, against 1.179 / 1.167 on Forward. New cell artefacts: GroomAnimalsLod{,Off}_GL_{Deferred,ForwardPlus}_ShortCoat_{Handover,Far}_Crop.png. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Linked Issues check |  |
[ #1595 ] is addressed: the PR scales card growth by strands per card, keeps the 1.2 ceiling, and reports horse, fox, and dog coverage checks. [ #1575 ] is addressed: USD uses vcpkg oneTBB, the guard … |
Implement [#1608] by recooking finer Bernese and Samoyed card levels and bringing the breed-test fixture within the memory ceiling, then verify the hand-over test against its 5% bar. Alternatively, remove the direct link if this PR does not… |
| Out of Scope Changes check | |
The OpenUSD, oneTBB, groom-coverage, and related test changes support [#1595] or [#1575]. The PR also changes GroomSimulationVisualEvidenceTest, RendererMemoryAccountingEvidenceTest, and GroomVegetati… |
Remove the unrelated renderer, vegetation, camera-guidance, and MCP documentation changes, or link them to issues that require those changes. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly summarizes both main changes: limiting thin-coat card growth and enforcing one oneTBB implementation per executable.
Full details: Linked Issues check
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Explanation
[
#1595] is addressed: the PR scales card growth by strands per card, keeps the 1.2 ceiling, and reports horse, fox, and dog coverage checks. [#1575] is addressed: USD uses vcpkg oneTBB, the guard checks duplicate core libraries, and the PR adds the USD stage-import and VolumeImport test coverage for Debug and Release. Directly linked [#1608] remains unmet. The PR reports unchanged Bernese and Samoyed hand-over results and does not recook finer card levels or reduce the breed fixture memory footprint.Resolution
Implement [
#1608] by recooking finer Bernese and Samoyed card levels and bringing the breed-test fixture within the memory ceiling, then verify the hand-over test against its 5% bar. Alternatively, remove the direct link if this PR does not include that issue.
Full details: Out of Scope Changes check
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Explanation
The OpenUSD, oneTBB, groom-coverage, and related test changes support [
#1595] or [#1575]. The PR also changes GroomSimulationVisualEvidenceTest, RendererMemoryAccountingEvidenceTest, and GroomVegetationStreamingEvidenceTest for separate camera-culling and asynchronous-wait failures. It adds camera guidance and documents the unrelated consented-writeolo_foliage_rebuildtool from#1603. These changes do not implement the linked issue requirements.
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Inline comments:
Review comments at @cmake/OneTbbGuard.cmake:
- Line 146: Update the cmake_file_api() query in the OneTbbGuard flow to work
with the declared CMake minimum, either by using a query mechanism supported by
CMake 3.25 or by raising the project’s declared minimum to 3.27. Ensure
configuration does not invoke an unsupported command on the supported CMake
versions, including when USD is off.
Review comments at @cmake/vendor/build-usd-config.cmake:
- Around line 32-33: Update the generator detection around `_generator` to fail
early with a clear CMake error if `${USD_BUILD_DIR}/CMakeCache.txt` is missing
or contains no matching `CMAKE_GENERATOR` line. Preserve the existing Visual
Studio detection when the generator is present.
Review comments at @cmake/vendor/patch-usd-tbb-version.cmake:
- Line 14: Update the explanatory comment in the patch script to name
dispatcher_impl.h and threadLimits_impl.cpp as the files it patches, replacing
the inaccurate filenames while preserving the note that already-patched files
are skipped.
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📒 Files selected for processing (24)
CMakeLists.txtOloEngine/CMakeLists.txtOloEngine/src/OloEngine/Groom/GroomLod.cppOloEngine/src/OloEngine/Groom/GroomLod.hOloEngine/src/OloEngine/Groom/GroomStrandMesh.cppOloEngine/src/OloEngine/Groom/GroomStrandMesh.hOloEngine/tests/CMakeLists.txtOloEngine/tests/Groom/GroomLodContractTest.cppOloEngine/tests/Rendering/PropertyTests/GroomAnimalsAcceptanceEvidenceTest.cppOloEngine/tests/Rendering/PropertyTests/GroomSimulationVisualEvidenceTest.cppOloEngine/tests/Rendering/PropertyTests/GroomVegetationStreamingEvidenceTest.cppOloEngine/tests/Rendering/PropertyTests/RendererMemoryAccountingEvidenceTest.cppOloEngine/tests/UsdStageImportTest.cppcmake/OneTbbGuard.cmakecmake/vendor/OpenUSD.cmakecmake/vendor/build-usd-config.cmakecmake/vendor/patch-usd-tbb-version.cmakedocs/agent-rules/README.mddocs/agent-rules/asset-import-usd-alembic.mddocs/agent-rules/build-trees-and-windows-asan.mddocs/agent-rules/groom-card-coverage.mddocs/agent-rules/openusd-build-and-link.mddocs/agent-rules/test-runtime-camera-defaults-to-orthographic.mdvcpkg.json
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…BB guard A script run with `cmake -P` starts with every policy unset, and CMake 3.x then applies OLD behaviour: the guard's if(... IN_LIST ...) (CMP0057) became "Unknown arguments" and failed the TSan and UBSan jobs, whose runners have CMake 3.31.6. CMake 4 has no OLD for that policy, so the local trees and the Windows jobs passed. OneTbbGuard.cmake, build-usd-config.cmake and patch-usd-tbb-version.cmake now call cmake_minimum_required(VERSION 3.27). Reproduced and checked with CMake 3.28 (WSL) and 4.4. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…needs The root CMakeLists declared 3.25, but cmake/OneTbbGuard.cmake requests its codemodel with cmake_file_api() (3.27) in every configuration, so a 3.25 or 3.26 configure would stop at an unknown command. The root now fails clearly under 3.27; the policies stay at 3.25's, so nothing else changes behaviour. Every supported path already meets it (presets 4.2, CI runners 3.31 / 4.4). The build and deployment docs and the README say 3.27. From CodeRabbit. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A missing CMakeCache.txt, or one without CMAKE_GENERATOR, used to fall through to the non-Visual-Studio branch and run MSBuild with /m:N on top of USD's /MP, the oversubscription the script exists to avoid. Both are now errors. The version-header patch's comment names the two files it edits, and the other three that test the macro, unambiguously. From CodeRabbit. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…USD scripts From review of the previous push: - The root now says cmake_minimum_required(VERSION 3.27), with cmake_policy(VERSION 3.25) keeping the policies as they were, instead of a hand-written version check beside a 3.25 declaration that tools read. - Win-GenerateProjectVS2022.bat's header says 3.27, like the docs. - patch-usd-pdb.cmake runs in the same PATCH_COMMAND as the oneTBB patch and now pins its policies too. Both USD patch scripts refuse a USD_SRC that is not a directory, instead of reporting a changed OpenUSD layout. - The oneTBB patch's comment states which files it edits and how the other four get the macro, matching the pinned source. Checked with CMake 3.28 (WSL) and 4.4. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
#1603 (e9e1e49) registered olo_foliage_rebuild, a ProjectWrite tool, without a row in docs/guides/mcp-diagnostics-server.md, so McpDocsCoverage's EveryRegisteredToolAppearsInTheGuide and EveryConsentGatedToolIsMarkedConsentedWriteInTheGuide fail on master. Found by this PR's TSan test shard 3/4; red locally on the old guide, green with the row. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
From review of the previous push: - CheckArchiveSize.cmake and apply-vendor-patches.cmake now pin their policies too, so no -P script in the repo runs with CMake 3.x's OLD defaults. Both run unchanged under CMake 3.28 and 4.4 (the archive check on OloEngine.lib; the FSR2 patch restored and re-applied). - CommonProperties.cmake's CMP0138 note and build-trees-and-windows-asan.md say where the 3.25 policies now come from (cmake_policy) and that the floor is 3.27. - The olo_foliage_rebuild row lists every refusal the handler returns. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Review comments at @docs/guides/mcp-diagnostics-server.md:
- Line 3078: Update the `olo_foliage_rebuild` documentation to remove the
unconditional off-frame preparation claim. Describe that warm rebuilds launch
CPU generation asynchronously, resource preparation advances during scene
updates, and the listed conditions can trigger synchronous `GenerateInstances`;
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CMakeLists.txtREADME.mdcmake/CheckArchiveSize.cmakecmake/CommonProperties.cmakecmake/OneTbbGuard.cmakecmake/apply-vendor-patches.cmakecmake/vendor/build-usd-config.cmakecmake/vendor/patch-usd-pdb.cmakecmake/vendor/patch-usd-tbb-version.cmakedocs/agent-rules/build-trees-and-windows-asan.mddocs/guides/mcp-diagnostics-server.mddocs/ops/build.mddocs/ops/deployment.mdscripts/Win-GenerateProjectVS2022.bat
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Only rebuilding an existing canopy on an unchanged terrain is prepared off the frame; a first generation, a changed height field or wind envelope, or a host with no task workers regenerates in the next scene update (FoliageRenderer::RequestRebuild). From CodeRabbit. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Two decided bugs, one branch.
Closes #1595
Closes #1575
#1575: one oneTBB per executable
Every USD-enabled executable linked two static oneTBB runtimes: the 2022.2 copy
cmake/vendor/OpenUSD.cmakebuilt for USD, and vcpkg's 2023.1 (OpenVDB's). USD's archive came first on the link line, so OpenVDB, compiled against 2023.1 headers, ran on 2022.2's internals, with/FORCE:MULTIPLEhiding any clash.Per the owner's decision (option 1):
usdmanifest feature installstbb;OpenUSD.cmakefinds itGLOBALand passes itsTBB_DIRto USD; the engine linksTBB::tbb. The cache key now names the full oneTBB version (usd-363a7c8d-tbb2023.1.0), so every box rebuilds USD once. An emptyTBB_VERSIONis a configure error.workTBBheaders testTBB_INTERFACE_VERSION_MAJORwithout including<tbb/version.h>, which 2022.2'sblocked_range.hused to bring in.patch-usd-tbb-version.cmakeadds the include.OLO_USD_INSTALL_DIRis refused at configure with the reason: a prebuilt install bundles its own oneTBB. No CI job used it.cmake/OneTbbGuard.cmakefails the build, beforeOloEnginecompiles, if any executable or shared library links more than one oneTBB core library (Windows and non-Windows names;tbbmallocis not counted). It reads the generated per-config link line from the CMake File API codemodel, requested withcmake_file_api(QUERY ...)so a fresh tree's first configure answers it on every generator.cmake_file_api()is a 3.27 command, so the root now declarescmake_minimum_required(VERSION 3.27)withcmake_policy(VERSION 3.25)(no policy changes); the build docs, deployment doc, README and the VS2022 script say 3.27. Every supported path already met it (presets 4.2, CI runners 3.31 / 4.4). The guard and the USD-Pscripts pin their own policies: under CMake 3.x a script starts with every policy OLD, which failed the first CI round's Linux jobs atif(IN_LIST).UsdStageImportTestopens a real.usdathrough the importer registry and checks the unit scale, the up axis, the UV origin, triangulation and the generated normal. No test imported a stage before.#1595: limit card coverage growth
The 1.2 ceiling stays, per the owner's decision; the growth is limited where the coat is thin.
PointCoverageGrowthwidens a card toward what its members cover as a lock. Measured, without growth the horses' cards already cover their strands at 32 m (short coat 1.145, long 1.013; 9 and 14 strands a card), and full growth put the short coat at 1.211. The foxes (26–30 strands a card) and dogs (45–127) fall 4–15% short without it.The stream now carries
1 + reach (growth - 1), with reach= clamp((strands per card - 1) / 31, 0, 1)(GroomCardCoverageGrowthReach, applied inGroomBuildSource::FromLevel). A card standing for one strand is that strand; 32 is the lock the growth law was validated on. The reach comes from curve counts the asset already carries, so no groom is re-cooked and the format is unchanged. The dogs' reach is exactly 1, so their stream is unchanged.Ruled out on the way, by shader A/B on one binary: the card's front-surface depth pull and tube radius, widened with the card. Using the cooked radius moved the short coat only 436 → 431 px; the growth's ~5% excess is independent of the pull.
Verification
#1575
Complete matrix: 4 axes, 9 cells.
UsdStageImportTest,VolumeImportOpenVDB.*(6),MeshInterchangeTest.*(9)GroomLodCook/GroomLodPolicy/GroomLodCompensationcontracts, Debug binary of the final treedev-cached(clang-cl, lld-link)OloEngine-Testslink;OneTbbGuard: 8 binaries checkedboth configsmsvc(VS 18 2026, link.exe)OloEngine-Testsbuilt and linked inbuild/;OneTbbGuard: 9 binaries checked; USD, OpenVDB, interchange and reach-contract tests on that binary-DOLO_WITH_USD=OFF(Windows.yml, asan.yml ×4, SonarCloud, fuzz, …); the guard still runs there over OpenVDB's oneTBBOLO_USD_INSTALL_DIRcmake build-cached -DOLO_USD_INSTALL_DIR=…olo_onetbb_guardfrom a cleared File API state,dev-cachedandmsvctbb12.liblinked beside vcpkg's#1595
Complete matrix: Path × Backend × Coat × Distance, plus Delivery and MSAA/upscale. GL cells come from
GroomAnimalsAcceptanceEvidenceTest.TheCoatKeepsItsCoverageFromNearToFar(Release, RTX 4090); the committed artefacts areGroomAnimalsLod{,Off}_GL_<Path>_<Coat>_<Stop>_Crop.png. Coverage is cards / strands.…_Forward_ShortCoat_Far_Crop.png…_Forward_ShortCoat_Handover_Crop.png…_Forward_ShortCoat_{Near,Mid}_Crop.png…_Forward_LongCoat_{Far,Handover}_Crop.png…_Deferred_ShortCoat_{Handover,Far}_Crop.png(new)…_ForwardPlus_ShortCoat_{Handover,Far}_Crop.png(new)…_{Deferred,ForwardPlus}_LongCoat_Handover_Crop.png…_DeferredMsaa4_LongCoat_Handover_Crop.png…_ForwardFSR{1,2}_LongCoat_Handover_Crop.pngFoxCoatLod_GL_Forward_*(FoxCoatEvidenceTest.TheCardsKeepTheCoatFromNearToFar)-Rhi vulkan,GroomAnimals.olo;olo_groom_budget_stats[error], 0 VUID[error]BreedShowcaseEvidenceTest.TheCardHandOverStepsTheCoatWithinTheNearLaddersBarGroomAnimalsAcceptanceEvidenceTest.LooseAndPackedGroomsAreTheAssetsThatWereCookedandRuntimeRepresentationStreamingPackTest.PackedGroomKeepsCardsWhileFinePreparationWaitsAndPlantsResolveFromTheGamepass. The live editor rows above load the re-exported horse coats loose.Found and fixed
--parallelwith no count), outside the build lock's memory-aware cap. It now takes the lock'sCMAKE_BUILD_PARALLEL_LEVEL, or the physical core count. Under MSBuild the count goes to/MP(CL_MPCount, one project at a time, because USD compiles every project with/MP), with/nodeReuse:false. Found rebuilding USD for Build: every USD-enabled executable links two static oneTBB versions (USD's 2022.2 and vcpkg's 2023.1) #1575.dev-cached,clangcl) picked LLVM's GNU-styleclang++from PATH and failed atcxxabi.h; the parent's clang-cl fails too. A non-VS Windows tree now builds USD with the Visual Studio generator (OLO_USD_VS_GENERATOR). Latent until Build: every USD-enabled executable links two static oneTBB versions (USD's 2022.2 and vcpkg's 2023.1) #1575's key change: every earlier cache had been seeded by an msvc tree.ShortCoatHorse/LongCoatHorsegrooms had been re-encoded to format v5 with growth 1.0 on every card point, never re-exported, so the live scene drew cards the evidence never validated. Re-exported with the test's own export case; the bindings, human coat, scene and registry are byte-identical.GroomSimulationVisualEvidenceTest, 5 of 8 red on master: its runtime camera was a defaultSceneCamera(orthographic, −1..1 depth), so the coat 60 units away was culled, the solver never stepped, and the suite read stale stats from the previous editor capture. Attributed with a per-frame stats print and three sibling worktrees' binaries. 8/8 pass; the coat now moves 130 464 px on every path.RendererMemoryAccountingEvidence.AGroomAndALawnLeaveNoPooledFramebufferBehind: the same default camera culled its tuft, and it passed only after another fixture left the renderer drawing it. 11/11 pass, alone and as a suite.GroomVegetationStreamingEvidenceTest.PreparedImpostorLayerRebuildWaitsForItsOwnGpuUploadexpected perf(foliage): stage warm rebuilds without blocking rendering #1603's now-asynchronous foliage re-bake on the next frame. It now waits for it.msvctree never answered. Caught by themsvccell; nowcmake_file_api(QUERY ...).olo_foliage_rebuild, a consented-write MCP tool from perf(foliage): stage warm rebuilds without blocking rendering #1603, had no row in the MCP guide, soMcpDocsCoveragefailed on master. Found by this PR's TSan test shard; red on the old guide, green with the row.test-runtime-camera-defaults-to-orthographic.md, the lesson from the two camera fixes.Filed, not fixed
Review guide
Where I'd look hardest
OloEngine/src/OloEngine/Groom/GroomLod.cpp(GroomCardCoverageGrowthReach): the reach is coat-wide, from the average strands per card. The asset carries no per-card member count, and computing one would re-cook every groom, the dog-owned ones included. A coat that mixes a dense body with a sparse mane gets one compromise value.cmake/OneTbbGuard.cmake: it trusts the File API codemodel'slibrariesfragments to be the link line. It cannot see a library brought in only by a#pragma comment(lib); USD's/DEFAULTLIB:"tbb12.lib"resolves to the same full-path archive (link.exeprobe), so today that is the same library.cmake/vendor/OpenUSD.cmake+build-usd-config.cmake: the cold USD build path ran once on this box (VS generator underdev-cached). The final/MPjob-count form was exercised on an up-to-date tree, so the cap's effect on a cold compile is read from the MSBuild props (CL_MPCount→ProcessorNumber), not measured.What I verified, and how: the red reproduced exactly (1.211, 436/360 px) before any change. The no-growth and no-pull shader arms attributed the excess to growth, not depth. The fix holds every coverage cell under 1.2 on GL Forward, Forward+ and Deferred, keeps the foxes, and leaves the dogs' numbers byte-identical. The guard's negative control fails the build. Debug and Release pass the USD and OpenVDB tests.
Least confident about: the strands-per-card threshold. 32 is the growth law's own validation lock, and the measured coats sit far from the ramp's ends (9–14 vs 26+), but a coat around 20 strands a card would land mid-ramp untested. Also the Debug editor's close with vcpkg's assert-enabled
tbb12_debug.lib: the Debug test binary exits clean after USD and OpenVDB work, but the editor's close was not measured.🤖 Generated with Claude Code
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