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>
Preview geometry dropdown: Sphere / Cube / Cylinder (native prims),
Teapot and Hair (bundled resources/preview/*.usdc - teapot tessellated
from the Newell patch data with the Blinn 1.3x height correction, hair
as 220 procedural B-spline strands), and Cloud Volume (UsdVolVolume
over the OpenVDB bunny_cloud sample, downloaded at CMake configure and
gitignored like the HDRIs). Shapes live under one scope with the
material bound on it; switching activates one shape and reframes the
camera. Missing assets drop out of the dropdown. usdVol added to the
USD link set. The camera starts in a Maya-style 3/4 view.
Node property values switch from Input* fields back to draggable
controls (Ctrl+click to type): live-apply while dragging, one undo
command on release.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The divider hit-zones are raw screen rects; gate them on
IsWindowHovered(ChildWindows) so a window stacked over the viewport
(e.g. the Material Editor) doesn't highlight or start a resize drag
through it. In-progress drags still track until release.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Hydra's HdxColorCorrectionTask rendered prims black in OCIO mode and could
corrupt the GlfDrawTarget bind stack on failure (skipping Unbind), blacking
out every later frame including sRGB. Replace it with our own GL post-process:
the scene renders linear (RGBA16F) and is corrected by a fullscreen shader --
linear->sRGB encode, or OCIO via the OCIO 2.1 GPU API (GpuShaderDesc plus
uploaded 1D/3D LUT textures). OCIO build failures fall back to sRGB (never
black) and USD diagnostics are routed to the app log.
- core: ViewportColorCorrector + ApplyViewportColorCorrection in UsdSceneRenderer
- utils: OcioConfigParser enumerates displays/views/colorspaces/looks from $OCIO
- ui: gear-menu OCIO controls (ViewportTile) + per-viewport persistence (ViewportPanel)
- Application: point $OCIO at the bundled ACES 1.2 config
- CMake: link/copy OpenColorIO, download ACES 1.2 config; plus hdCycles build
config (disable OpenVDB/Embree, fix TBB/OpenSubdiv/Imath dirs, exclude CRT DLLs)
- main: pre-flight plugin DLL load check to skip plugins with missing deps
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Sets io.IniFilename to %APPDATA%\UsdLayerManager\imgui.ini right after
CreateContext so ImGui never touches the working directory for layout
persistence. The directory is created on first run via create_directories.
m_iniFilePath on ImGuiContext holds the string so the pointer stays valid
for the lifetime of the context.
Also removes imgui.ini from version control and adds it to .gitignore.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
indigo