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indigo e2a4961ebe Upgrade to OpenUSD 25.11 (Python 3.12) and fix Arnold/Embree regressions
Build against OpenUSD 25.11 built from source with Python 3.12, OCIO 2.2.1,
OpenVDB, Ptex and Embree, replacing the 25.05/py311 mix.

Build system:
- CMAKE_PREFIX_PATH -> third_party/OpenUSD-v25.11; HDARNOLD_ROOT ->
  hdArnold-v25.11. hdEmbree is bundled in the USD build now, so
  HDEMBREE_USD_ROOT is no longer needed.
- FindOpenUSD: drop usd_ndr (ndr was merged into sdr in 25.11).
- hdArnold plugin renames: ndrArnold -> nodeRegistryArnold, plus the new
  usdImagingArnold plugin.
- Glob the version-suffixed OpenColorIO_*.dll instead of hardcoding 2_1.
- Drop the python311.dll workaround; USD and Cycles now share Python 3.12.
- Cycles: deploy OpenColorIO_2_5.dll (needed by its bundled OpenImageIO) and
  stop the debug-DLL filter from eating IlmThread.dll -- the regex `d[.]dll$`
  also matched legitimate Release DLLs.

Runtime fixes:
- cullStyle now defaults to Nothing, matching usdview (viewSettingsDataModel
  cullBackfaces=False). BackUnlessDoubleSided drops back faces on geometry
  that isn't authored doubleSided, which hdEmbree applies to occlusion rays
  too, so interiors shaded as single-sided.
- Set HDARNOLD_osl_includepath (and PXR_MTLX_STDLIB_SEARCH_PATHS) in main.cpp
  before the plugin DLL pre-load. hdArnold compiles MaterialX via generated
  OSL that begins with #include "mx_funcs.h"; without an include path Arnold
  fails with "fatal error: 'mx_funcs.h' file not found". It must be set before
  any plugin loads because TF_DEFINE_ENV_SETTING caches the value when
  hdArnold.dll registers its settings.
- Deploy the MaterialX standard library next to the executable.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-03 10:02:00 +08:00

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# Build directories
build/
build_*/
install/
out/
.kilocode/
.kilo/
third_party/
example/
# CMake
CMakeCache.txt
CMakeFiles/
cmake_install.cmake
*.cmake
!CMakeLists.txt
!cmake/modules/*.cmake
!CMakePresets.json
# Visual Studio
.vs/
*.vcxproj
*.vcxproj.filters
*.vcxproj.user
*.sln
*.suo
*.user
*.userosscache
*.sln.docstates
# Compiled Object files
*.o
*.obj
*.lo
*.slo
# Compiled Dynamic libraries
*.so
*.dylib
*.dll
# Compiled Static libraries
*.a
*.lib
*.lai
*.la
# Executables
*.exe
*.out
*.app
# Debug files
*.pdb
*.ilk
*.exp
# IDE
.vscode/
.idea/
*.swp
*.swo
*~
# OS
.DS_Store
Thumbs.db
desktop.ini
# Logs
*.log
# Temporary files
*.tmp
*.temp
# ImGui layout (saved to %APPDATA%\UsdLayerManager at runtime)
imgui.ini
# OCIO config LUT files — downloaded automatically at CMake configure time
resources/OpenColorIO-Configs/
resources/hdri/
resources/vdb/