2026.03

v2026.3 March 6th, 2026

General Changes:

• Fixed compatibility with USD 25.x
• Our version numbering is changing format to YYYY.0M (Year/Month) with an added patch if applicable
• Our clang-format configuration is now updated and formatting is now a requirement
• Include/header files have been cleaned up

Features

gltf

• add support for KHR_materials_coat extension
• Skip invalid IOR values < 1.0

sbsar

• relative image path resolution

Fixes

fbx

• fix FBX standard material import
• skeleton index validation / avoid default indexes / out of bounds checks
• fix skeletal animation for joints that only have curves on individual channels
• Handle color spaces correctly according to declared parameters
• Armature scale is applied only once through the USD hierarchy

gltf

• add input validation to prevent memory corruption vulnerabilities
• update readme to fix param name

obj

• adding computeNormals to SDF_FORMAT_ARG
• cpp 20 compilation fix
• Adjust FMT library dependency in the OBJ plugin to solve linker issues

sbsar

• specifying substance engine/framework for arm64
• folder/subfolder support when parsing SBSAR files
• filter SBSAR by graph type
• increase default cache size to 2GB for smooth 4K texture handling
• tests fix double free error on Linux by removing getRenderThreadState() in destructor
• tag texture attributes with color space information for MaterialX/OpenPBR
• Fix conversion of sbsar displacement to OpenPBR
• Revamp heuristic fallbacks for procedural input image path resolution
• Add inverted uv scale for use with openpbr
• Correct normal scale / bias in directx style sbsar files for OpenPBR

utils

• add asset path to input:file property of UsdPreviewSurface and ASM shaders
• switch to ND_UsdUVTexture_23 for texture reads in OpenPBR/MaterialX networks
• add type checking to setAttributeDefaultValue() to catch invalid data
• check for empty values when setting the default value and forgo the type check
• readLayer to correctly processes instancing setups
• OpenPBR oriented material reading
• add general preserveExtraMaterialInfo file format argument
• improvements on ASM to OpenPBR conversion
• updating third-party dependencies

Build System

utils

• updated the baselines images for the fbx plugins to match colorspace changes

v1.2.0

fbx:
- fix mesh import when fbx mesh is a root node
- do not require gtest if tests are disabled
- bind meshes that have materials but no elementmaterials
- add 'triangulatemeshes' import option to allow control of whether triangulation should be performed
- add generator metadata to USD
- support bitangents/tangents during import/emport
- fix material property mapping for non lambert/phong shader models

gltf:
- fix material index lookup when material is missing
- support khr_materials_volume_scatter extension
- improved support for gltf scattering extension
- add support for textures with brackets in their file names
- support EXT_materials_specular_edge_color & EXT_materials_clearcoat_color
- add generator metadata to USD
- fix various crashes
- support bitangents/tangents during import/export
- fix inverted normal maps

obj:
- replace backslash with slash in texture filepath
- fix crash on loading a file > 2gb
- allow single value for ke material setting

ply:
- fix reading gsplat sh coefficients
- fix export issues when not all meshes have uvs or normals
- remove clipping to SH0 for Gsplat
- fix GSplat import and export and add support to SH4

spz:
- remove clipping to SH0 for Gsplat
- fix GSplat import and export and add support to SH4

sbsar:
- expose uv texture repeat controls
- panorama support
- refactor of sbsar for MaterialX support
- allow for unlimited cache
- switching the default normal format to sbsar

stl:
- reverse normals on export
- support empty normals on import
- calculate geometric normals on import

utility:
- increase MaterialX OpenPBR support
- improve shared file format args
- refactor input struct & material processing
- fix for crash in smooth normals computation
- update test baseline images for 24.11 renderer changes

cmake:
- switch from cmake FetchContent to CPM
- updating openimageio cmake

usd:
- adding support for usd 25.05.01

USD-2603-Artifacts

USD built with the following parameters: --build-shared --openimageio --tools --usd-imaging --build-variant release --use-cxx11-abi=0 (linux)

USD-2511-Artifacts

USD built with the following parameters: --build-shared --openimageio --tools --python --debug-python --usd-imaging --build-variant release --use-cxx11-abi=0 (linux)

USD-2508-Artifacts

USD built with the following parameters: --build-shared --openimageio --tools --python --debug-python --usd-imaging --build-variant release --use-cxx11-abi=0 (linux)

v1.1.1

v1.1.1 March 10th, 2025
fbx:

• added null and index checks
• properly write images when import images arg is invoked
• add support for invisibility
  gltf:
• export normal scale
• ignore invisible nodes on export
  obj:
• fix parser to remove vulnerability
• ignore invisible nodes on export
  ply:
• ignore invisible nodes on export
  sbsar:
• fix for isImageFileSupported() [fixes nested sbsarimages]
  spz:
• ignore invisible nodes on export
• initial
  stl:
• ignore invisible nodes on export
  utility:
• don't create subdivisionRule attribute with value none
• fix for isImageFileSupported() [fixes nested usdz images]
• prevent bad access in utils

USD-2505-Artifacts

USD built with the following parameters: --build-shared --openimageio --tools --python --debug-python --usd-imaging --build-variant release --use-cxx11-abi=0 (linux)

v1.1.0

v1.1.0 January 31st, 2025
fbx:

• add display name to USD to save imported names for export
• import specular roughness from autodesk standard surface
• interpolate diffuse color on export for intermediate metallic values
• avoid creating extra root nodes during import & export
• adjust mesh and mesh instancing setup

gltf:

• add display name to USD to save imported names for export
• ignore invalid indices on export
• adjust mesh and mesh instancing setup

ply:

• add spherical harmonics support
• detect nan values for gsplat opacity and convert to 0
• fix for loading ply files with non-ascii characters in filename

sbsar

• updated the list of sbsar engines for mac x64 to include metal
• add emissive intensity of 1 when we find emissive color
• set scale and bias correctly for normal map reader nodes

utility:

• update required env vars for Mac in Readme
• print OIIO error on failure
• restrict XForm collapsing to DefaultPrim
• usd v24.11 cleanup
• refactor utility exporting, cmake cleanup, rename files, remove extra logs

v1.0.10

v1.0.10 November 19th, 2024
fbx:

• small fbx spot light fixes
• missing file warning
• file names added to metadata now avoid dupes
  gltf:
• ensure consistent light with usd
  stl:
• fix up axis rotation, default is assumed to be z-up
  utility:
• more robust handling of the no texture coordinate warning
• add mesh name in generated sub mesh

USD-2411-Artifacts

USD built with the following parameters: --build-shared --openimageio --tools --python --debug-python --usd-imaging --build-variant release --use-cxx11-abi=0 (linux)