v2026.07 July 17th, 2026
Features
all
- Flip writer defaults to native OpenPBR
- Deprecate ASM and UsdPreviewSurface writers in favor of native OpenPBR
- Replace the default ASM material struct with OpenPBR using a feature flag
fbx
- Import OpenPBR materials from Maya and 3ds Max exports
- add support for new SDF_FORMAT_ARGS:importLights option
gltf
- Add various OpenPBR features to glTF import
- add support for new SDF_FORMAT_ARGS:importLights option
sandbox
- added sandbox module alongside ipc and serialization modules
sbsar
- Create shader graph to convert sbsar tangent input to geometry_tangent
- Add API to get resolved path from image cache for SBSAR SAL interop
utils
- UTF-8-aware MakeValidUsdIdentifier prim-name sanitizer
- Per-node custom properties as prim customData
Fixes
all
- Move normalScale from texture reader scale/bias to ND_normalmap scale input
- Use constants to initialize normal scale/bias
fbx
- Preserve material assignment for InstanceProxy models
- Preserve rotation on FBX nodes with near-zero scale
- Resolve sibling textures when GetRelativeFileName returns absolute-looking path
- Work around FBX SDK 2020.3.9 triangulate crash on skinned meshes
- Preserve per-GeomSubset material bindings on export
- Import Phong materials as dielectric by default
- Matte Lambert roughness and reflectivity-gated Phong metalness
- Preserve roughness when converting Phong FBX materials to USD
- Zero specular_weight and transfer Lambert Diffuse weight to base_weight
- Attach materials to every shared-mesh instance node
- Triangulate meshes with untriangulated n-gon polygons
gltf
- Do proper conversion of gltf anisotropy to OpenPBR on import
- Fix for crash caused by failing to check value validity
- Skip UsdLuxDomeLight on export instead of converting to point light
- Reject animation samplers with mismatched accessor counts
- Avoid duplicate tinygltf symbols with Xcode 26 linker
- Author mesh extent on import to keep bbox queries O(1)
- Validate vertex attribute accessor types to prevent heap overflow
- Fold OpenPBR base_weight into baseColorFactor on export
obj
- Fix missing materials with combineGroups and separateGroupsAsSubsets
- Parse ZBrush #MRGB vertex colors in OBJ import
- Defer parser warnings from TBB workers to main thread
- Removing stale obj test
- Derive roughness from Phong shininess on import
- Keep map_Kd texture when Kd is a placeholder zero
- Escape untrusted bytes in OBJ parser diagnostics
ply
- One-liner fix to narrow opacity filtering with std::isnan
- Write per-face color/opacity at submesh offset and guard property size
sbsar
- Various improvements to the SBSAR render thread
- Incorrect mapping of asm 'scatteringColor' and added missing mapping of 'scatteringDistance'
- Fix intermittent null-deref crash in render thread on startup
- Fix mapping of sbsar outputs using OpenPBR material model to openpbr material inputs
- Default-initialize RenderResultCache members and guard against nullptr
- Guard against null mRenderResultImage in _OpenForReading
- Join render thread before static teardown
- Suppress error for empty path in SBSAR image input
- Fix reading of sbsar images
stl
- Reject non-3D-model files sharing the .stl extension
utils
- Uniquify meshes, curves, and child nodes in shared prim namespace
- Post a coding error when authoring duplicate prim children
- Uniquify node names (especially synthesized Materials node)
- Guard Image::allocate/read against integer overflow
Docs
fbx
- Add FBX SDK update process documentation