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Change Log

[0.7.6] - 2017-06-30

Added

  • Added build_scripts/build_usd.py for building USD and its dependencies.
  • Added support for building static libraries or a single monolithic shared library. See BUILDING.md for more details.
  • Added support for color spaces to Usd. Color configuration and management system can be specified on a UsdStage (via the stage's root layer), and colorSpace metadata is available on any UsdAttribute.
  • Added clip set functionality to Usd. This provides the ability to specify multiple sets of value clips on the same prim, which allows users to compose different sets of clips together. See UsdClipsAPI for more details.
  • Added initial UsdLux schemas for representing interchangeable lights and related concepts, and UsdRi schemas for Renderman-specific extensions. UsdImaging/Hydra support will be coming in a future release.
  • Added ability to specify smooth triangle subdivision scheme for catmullClark surfaces in UsdGeomMesh and imaging support in Hydra.
  • Added backdrops for node layout description in UsdUI.
  • Added support for sharing immutable primvar buffers to Hydra. This can greatly reduce the memory required on the GPU when displaying typical scenes. It is currently experimental and disabled by default. It can be enabled for testing with the environment variable HD_ENABLE_SHARED_VERTEX_PRIMVAR.
  • Added support for uniform primvars for basis curves in Hydra.
  • Added ability to Alembic plugin to control number of Ogawa streams used for each opened archive via the environment variable USD_ABC_NUM_OGAWA_STREAMS, which defaults to 4.
  • Added Katana plugin support for reading UsdLux lights.
  • Added --camera command line argument to usdview to specify the initial camera to use for viewing.
  • Added display of instance index and (if authored) instance ID to rollover prim info in usdview.
  • Added initial version of Houdini plugin.

Changed

  • Removed unnecessary dependency on OpenImageIO binaries.
  • Removed unnecessary dependency on boost::iostreams.
  • Made HDF5 backend for Alembic plugin optional. HDF5 support is enabled by default but may be disabled by specifying PXR_ENABLE_HDF5_SUPPORT=FALSE to CMake.
  • Metadata fields for value clips feature in UsdStage (e.g. clipAssetPaths, clipTimes, etc.) have been deprecated in favor of the new clips metadata dictionary. Authoring APIs on UsdClipsAPI still write out the deprecated metadata unless the environment variable USD_AUTHOR_LEGACY_CLIPS is set to 0. This will be disabled in a future release.
  • When using value clips, Usd will now report time samples at each time authored in the clip times metadata.
  • Completed support for encoding UsdShade data using UsdAttribute connections. Authoring APIs still write out the old encoding, unless the environment variable USD_SHADE_WRITE_NEW_ENCODING is set to 1. This will be enabled in a future release.
  • Removed support for deprecated UsdShade schemas UsdShadeParameter and UsdShadeInterfaceAttribute, which have been superseded by UsdShadeInput.
  • Removed deprecated UsdRiLookAPI, which has been replaced by UsdRiMaterialAPI.
  • Removed deprecated Hydra scene delegate APIs.
  • Significant refactoring and refinements to allow multiple backends to be plugged in to Hydra.
  • UsdImaging now pushes GL_DEPTH_BUFFER_BIT to avoid any potential state pollution issues when integrating it with other renderers.
  • Improved error handling in Hydra for:
    • Invalid point instancer input
    • Inconsistent displayColor and displayOpacity primvars
    • Direct instances of imageable prims
  • usdview more gracefully handles the situation where it doesn't get a valid GL context (e.g., due to limited resources on the GPU).
  • Improved how edits are handled on assembly nodes in the Maya plugin.
  • Improved UsdGeomPointInstancer support in the Katana plugin:
    • Overhauled methods for computing instance transforms and aggregate bounds.
    • Backward motion and multi-sampled point instancer positions, orientations, and scales are now supported.
    • Removed opArgs attributes that were used for configuring the reader's behavior.
    • More robust primvar transfer to point instancer's Katana locations.
    • Restructured prototype building logic to preserve material bindings when creating prototype prims.
  • Numerous changes and fixes for Mac and Windows ports.

Fixed

  • Fixed issue that caused IDEs and other tools to find headers in the build directories rather than the source directories.
  • Fixed race condition in TfType.
  • Fixed long-standing memory corruption bug in Pcp that surfaced when building on MacOS with XCode 8.3.2.
  • Fixed potential deadlocks in Usd and Pcp due to issues with TBB task group isolation.
  • Fixed bug where UsdStage::Flatten was not preserving attribute connections.
  • Fixed infinite loop on glGetError in the presence of an invalid GL context. (Issue #198)
  • Fixed build issues that caused the Maya plugin to be unusable after building on MacOS.

[0.7.5] - 2017-05-01

C++ namespaces are now enabled by default. The PXR_ENABLE_NAMESPACES CMake option may be used to disable namespaces if needed.

This release adds initial experimental support for building the USD core libraries on Windows.

Added

  • Added ability to build doxygen documentation. See BUILDING.md for more details.
  • Added support for pre-compiled headers. By default, this is disabled for Linux and Mac builds and enabled for Windows builds. This may be configured with the PXR_ENABLE_PRECOMPILED_HEADERS CMake option.
  • Added many unit tests for core libraries
  • Added UsdStage::Save and UsdStage::SaveSessionLayers
  • Added attribute connection feature that allows consumers to describe connections between an attribute and other prims and properties.
  • Added instance proxy feature that allows consumers to interact with objects on a UsdStage as if scenegraph instancing were not in use while retaining the performance benefits of instancing.
  • Plugins providing Boundable schema types can now register functions for computing extents. This allows code in the USD core to compute extents for prims with types provided by external schemas.
  • Added support for specializes arcs to usdShade.
  • Added UsdUISceneGraphPrimAPI for representing prim display properties.
  • Added HD_DISABLE_TINY_PRIM_CULLING flag for TF_DEBUG to make it easier to turn off tiny prim culling for debugging.
  • Added support for generic metadata to GLSLFX, allowing hardware shaders to pass information to downstream rendering code.
  • Added ability to adjust basic material properties in usdview.
  • Plugins can now register MayaPrimWriter subclasses for exporting Maya nodes to USD prims.
  • Added ability to override default motion data (sample times, current time, shutter open/close) on a per-scope basis in Katana plugin. Users can author these overrides by modifying the global graph state, then decide to use the default motion values with or without these overrides applied.

Changed

  • Removed OpenEXR dependency from core libraries. Note that OpenEXR is still required for imaging.
  • Made Ptex dependency optional. It is only required if Ptex support for imaging is enabled. This is on by default, but can be disabled by specifying PXR_ENABLE_PTEX_SUPPORT=FALSE to CMake.
  • Cleaned up and expanded doxygen documentation:
    • Added documentation for value clips and scenegraph instancing USD features.
    • Enabled XML generation for external tools
    • Fixed invalid tags and formatting in several places
  • UsdTreeIterator has been replaced by UsdPrimRange, which provides container-like semantics in C++ (e.g., the ability to use them in range-based for loops).
  • Removed UsdPrim::GetPayload API
  • UsdRelationship and UsdAttribute will no longer forward target/connection paths that point to objects within instances to objects in master prims. Users can use the new instance proxy functionality to work with these paths instead.
  • Relationships belonging to prims in instances that point to the root of the instance no longer cause errors.
  • Value clip metadata can now be sparsely overridden across composition arcs.
  • Deprecated shading property schemas UsdShadeParameter and UsdShadeInterfaceAttribute. These are replaced by UsdShadeInput, which can represent both input parameters on shaders and interface inputs on node graphs.
  • The --compose command line parameter for usddiff is now --flatten
  • Numerous cleanup changes for Hydra API. In particular:
    • HdEngine::Draw has been retired in favor of HdEngine::Execute.
    • HdSceneDelegate::IsInCollection has been deprecated in favor of render-tag based API.
  • Meshes with subdivisionScheme = none will no longer be bilinearly subdivided.
  • usdview now displays prim hierarchies beneath instances inline in the browser. The "Jump to Master" command has been removed in favor of this new functionality.
  • The default specular response in usdview has been reduced by a factor of 5.
  • The Maya plugin now excludes attributes during import if they are tagged with customData specifying them as generated.
  • Numerous changes for ongoing Mac and Windows port efforts.
  • Changed scoping of built-out point instancer prototypes in Katana plugin so that their hierarchy more closely matches the original USD hierarchy.

Fixed

  • Added workaround to avoid redefined "_XOPEN_SOURCE" and "_POSIX_C_SOURCE" macro warnings due to Python includes on Linux. (Issue #1)
  • Fixed issue where code would be generated directly into the install location when running cmake, interfering with the use of make's DESTDIR functionality. (Issue #84)
  • Fixed memory leak when converting Python tuples to C++ GfVec objects.
  • Fixed thread-safety issue with PCP_PRIM_INDEX and PCP_PRIM_INDEX_GRAPHS TF_DEBUG flags. (Issue #157)
  • Fixed invalid memory access bug in Pcp
  • Fixed memory leak when saving .usdc files.
  • Fixed bug with removing an attribute's last time sample in a .usdc file.
  • Fixed bug where instance prims with locally-defined variants would incorrectly share the same master prim.
  • Reader-writer locks are now used for various registry to improve performance.
  • Improved speed of adding an empty sublayer to an opened stage. In one large test case, time to add an empty sublayer went from ~30 seconds to ~5 seconds.
  • Fixed issues with opening .usda files and files larger than 4GB on Windows. (Issue #189)
  • Fixed backwards compatibility issues with UsdShadeInput and UsdShadeConnectableAPI.
  • Memory footprint has been significantly reduced in Hydra's adjacency tables for subdivs that contain vertices of high valence.
  • Fixed crash in imaging due to invalid textures.
  • Fixed shadow banding artifacts when using vertex color with basis curves.
  • Fixed buffer overrun when using GPU smooth normals.
  • Fixed issue in Maya plugin where multiple assemblies that reference the same file might all be affected by the edits of one particular assembly when viewing them via a proxy.
  • Fixed issue in Maya plugin where path resolution was being done by the plugin itself rather than deferring to Usd and Sdf.

[0.7.4] - 2017-03-03

USD now supports C++ namespaces. They are disabled by default in this release to ease transition, but we anticipate enabling them by default in the next release.

Specify the PXR_ENABLE_NAMESPACES CMake option to enable namespaces. See documentation in BUILDING.md for more details.

Added

  • Added GfHalf type to represent half-precision numeric values. This type is currently an alias to the "half" type supplied by the ilmbase library USD is built against. This will be changed in an upcoming release to point to a version of "half" that is included in the USD codebase, which will allow us to remove the USD core's dependency on ilmbase.
  • Added UsdShadeInput class to represent shader or NodeGraph input. These are encoded as attributes in the "inputs:" namespace. By default, this encoding will not be written out via UsdShadeConnectableAPI unless the 'USD_SHADE_WRITE_NEW_ENCODING' environment variable is set.
  • Added "Composition" tab to usdview that allows users to inspect the composition structure of a selected prim.
  • Added tests for Hdx. These tests are currently not run as part of the unit test suite, but are being included for users to try on their platforms and to serve as example code.
  • Added icons for the USD assemblies in Maya.
  • Added initial implementation of Katana plugin for reading UsdGeomPointInstancer locations.

Changed

  • CMake module now additionally looks for the pyside-uic binary under the name pyside-uic-2.7 to accommodate package managers on OSX.
  • Removed GLUT dependency.
  • Removed double-conversion dependency.
  • Modified all uses of "half" type from ilmbase to use new GfHalf type.
  • Renamed UsdShadeSubgraph to UsdShadeNodeGraph to conform with final MaterialX terminology.
  • Numerous changes for in-progress work on refactoring Hydra to support render delegates.
  • Updated UI in usdview to display legends for text coloring in collapsible panes and to include more information.
  • The import UI in the Maya plugin now enables reading of anim data by default.
  • Updated API in Maya plugin that referred to "look" to "material".
  • Numerous changes for ongoing Mac and Windows porting efforts.

Fixed

  • Fixed several issues when building with C++ namespaces enabled.
  • Fixed bug with selection highlighting for instanced prims in usdview.
  • Fixed crash that occurred when an invalid color primvar was encountered while using usdview's "simple" renderer.
  • Fixed issue with TF_REGISTRY_DEFINE* macros that caused build failures for the Maya plugin on OSX. (Issue #162)

[0.7.3] - 2017-02-05

Added

  • Added support for RelWithDebInfo and MinSizeRel release types.
  • Added initial support for C++ namespaces. This feature is currently experimental but can be enabled by specifying the PXR_ENABLE_NAMESPACES option to CMake. See documentation in BUILDING.md for more details.
  • Added population masking to UsdStage.
    • Consumers can specify what parts of a stage to populate and use to reduce resources used by the stage.
    • usdview now has a --mask option allowing users to view just the specified portion of a stage.
  • Added UsdPrim API for collecting relationship targets authored in a given prim subtree.
  • Added UsdShade API to allow creating and connecting outputs on subgraphs and shaders instead of terminals.
  • Added support for bool shader parameters in Hydra. (Issue #104)
  • Added ability to independently toggle display of geometry with purpose=proxy in usdview.
  • Added initial set of unit tests for pxrUsd library in the Maya plugin.
  • The Maya plugin now supports multi-sampling of frames during export.
  • Attributes in Maya may now be tagged to be converted from double to single precision during export.
  • Alembic tagging for attributes in Maya are now respected during export. This includes support for primvars and custom prefixes.
  • Added support for playing back animation in assemblies via Hydra when the Playback representation is activated in Maya.
  • Added support for reading material references in Katana plugin.

Changed

  • CMake will no longer look for X11 on OSX. (Issue #72)
  • The build system now uses relative paths for baking in plugin search paths, allowing for relocatable builds as long as all build products are moved together as one unit.
  • Removed hard-coded /usr/local/share directory from plugin search path.
  • Optimized creation of prim specs in Sdf. Creating 100k prim specs previously took 190s, it now takes 0.9s.
  • SdfPath::GetVariantSelection now returns a variant selection only for variant selection paths.
  • UsdStage no longer issues an error if requested to unload a path that does not identify an unloadable object.
  • Changed API on UsdInherits, UsdReferences, UsdRelationship, UsdSpecializes, UsdVariantSet, and UsdVariantSets for clarity.
  • Hydra GPU compute settings have been consolidated under a single HD_ENABLE_GPU_COMPUTE environment setting which is enabled by default if the OpenSubdiv being used supports the GLSL compute kernel.
  • Numerous changes for in-progress work on refactoring Hydra to support render delegates.
  • Changed 'Display' menu in usdview to 'Display Purposes...' and menu items to match USD terminology.
  • Updated required Maya version to Maya 2016 EXT2 SP2.
  • Normals are now emitted by default when exporting polygonal meshes in Maya.
  • Katana plugin now supports deactivating prims directly on UsdStage for improved efficiency.
  • Continued work on deprecating UsdShadeLook in favor of UsdShadeMaterial.
  • Numerous changes for ongoing Mac and Windows porting efforts.
  • Changed coding style to use symbol-like logical operators instead of the keyword-like form (e.g., '&&' instead of 'and').
  • Various cleanup changes to fix comments, compiler warnings, and to remove unused/old code.

Fixed

  • Fixed composition bug where nested variants with the same name were composed incorrectly.
  • Fixed composition bug where variant selections from classes were not being applied in certain cases. (Issue #156)
  • Fixed .usda file output to write out floating point values using the correct precision and to use exponential representation for values greater than 1e15 (instead of 1e21) to avoid parsing issues.
  • Fixed bug where negative double values that could be represented as floats were not stored optimally in .usdc files.
  • Fixed bug where UsdPrim::Has/GetProperty would return incorrect results.
  • Fixed bug where UsdObject::GetMetadata would return incorrect results for dictionary-valued metadata in certain cases.
  • Fixed bug where reading certain .usdc files while forcing single-threaded processing via PXR_WORK_THREAD_LIMIT would lead to a stack overflow.
  • Fixed missing garbage collection for shader and texture resource registries in Hydra.
  • Several fixes for nested instancing support in Hydra (native USD instances containing other instances or point instancers, etc.)
  • Fixed "Jump to Bound Material" in "Pick Models" selection mode in usdview.
  • Fixed bug where USD assemblies would not be drawn in Maya under VP2.0.
  • Workaround for performance issue when drawing proxies in Katana plugin.
  • Fixed issue causing USD Alembic plugin to fail to build with Alembic 1.7. (Issue #106)
  • Various other bug fixes and performance improvements.

[0.7.2] - 2016-12-02

Added

  • Added ability to apply a custom prefix to shared library names by specifying the PXR_LIB_PREFIX option to CMake.
  • Added ability to disable tests by using the PXR_BUILD_TESTS option with CMake.
  • usddiff can now diff two directories containing USD files.
  • Value clips on a prim may now be specified using 'template' clip metadata. This is a more compact representation for simple cases where each value clip corresponds to a single time code.
  • Better support for non-file-backed asset resolution
    • Made ArDefaultResolver public, so that subclasses can layer behavior on top of it.
    • Added ArResolver API for retrieving files from data store when needed.
  • Initial version of UsdGeomPointInstancer schema and preliminary support in usdImaging.
  • pxrUsdReferenceAssemblies in Maya can now import animation from a USD scene. See http://openusd.org/docs/Maya-USD-Plugins.html#MayaUSDPlugins-ImportingasAssemblies for details.
  • Core USD metadata (e.g. hidden, instanceable, kind) now roundtrips through Maya, stored as "USD_XXX" attributes on corresponding Maya nodes.

Changed

  • Removed dependency on Qt. Note that PySide is still a dependency for usdview.
    • Removed imaging/glfq library as part of this work.
  • Modified variant behavior in composition:
    • Variants may now be nested within other variants in scene description. Nested variants may be authored by using nested UsdEditContext objects returned by UsdVariantSet::GetVariantEditContext.
    • Weaker variants may now introduce variant selections that affect stronger variants. Previously, these selections would be ignored and the variant fallbacks would be used instead.
  • Optimized .usdc file format performance in certain cases:
    • Output is buffered in memory to improve write times for layers containing many nested dictionaries. In one such example, wall-clock time improved by ~64% and system time improved by 89%.
    • Time samples are now written out grouped by time to improve read performance for frame-by-frame access patterns.
  • Several optimizations to improve USD scenegraph authoring and composition speed and reduce memory consumption. In some use cases, we observed:
    • ~5-7x less memory consumed by Pcp dependency tracking structures
    • ~40% less time spent to author large stages
  • Exporting USD from the Maya Export window now produces binary .usd files by default instead of .usda files.

Fixed

  • Fixed bug where edits to a layer opened in Maya would persist when reopening that layer in a new scene.
  • Fixed issue where exporting USD from the Maya Export window would produce files ending with ".usda", even if a different format was specified. The exporter should now respect any extension that is entered, so long as the "Default file extensions" option is turned off.
  • Fixed several issues with example plugins being improperly built, making them unusuable, and missing functionality.
  • Various other bug fixes and performance improvements.

[0.7.1] - 2016-09-21

Added

  • UsdMaterial schema for shading, intended to replace UsdLook. Also added support for this new schema to Hydra.
  • Initial version of UsdUI schema library, intended for encoding GUI information on USD prims.
  • Parallel teardown of some data members in UsdStage, speeding up overall teardown by ~2x.
  • Support for packed vertex normals to Hydra, reducing GPU memory consumption by 20-30% in some cases.
  • Ability to compare two composed stages to usddiff by specifying the "--compose" or "-c" options.
  • Support for soft-selection for collapsed USD assemblies in Maya.
  • Support for exporting color sets and UV sets as indexed primvars from Maya.

Changed

  • Refactored Hydra libraries to move higher-level concepts out of the core hd library and into hdx.
  • Removed use of opensubdiv3/ include path from imaging code in favor of standard opensubdiv/ include.
  • Modified UsdStage to automatically load newly-discovered payloads if their nearest ancestor's payload was also loaded. For example, consumers will no longer have to explicitly call UsdStage::Load to ensure payloads are loaded when switching variants on a prim, so long as their nearest ancestor is also loaded.
  • Refactoring and other changes to help with Mac and Windows ports.
  • Updated doxygen and other documentation.

Fixed

  • Fixed issue that caused Alembic plugin (usdAbc) to be misconfigured at build time, which required users to manually update its plugInfo.json and set an environment variable at runtime to make it work. This plugin is now installed to $PREFIX/plugin/usd/ and requires no additional steps to use once it has been built.

  • Fixed issue with .usdc files that resulted in corrupted files on Windows. The file structure was changed, so the .usdc version has been bumped from 0.0.1 to 0.1.0. USD will continue to write 0.0.1 files by default, but will begin writing 0.1.0 files in the near future.

    Users may choose to write files with the new version immediately by setting the environment variable USD_WRITE_NEW_USDC_FILES_AS_VERSION to "0.1.0".

    Note that 0.0.1 files are still readable using this release, except for those that have been generated on Windows using 0.7.0. Early testers on Windows will need to regenerate those files with this release.

  • Fixed issue that caused usdGenSchema to generate files that could not be compiled.

  • Added a workaround for TBB-related issue in Maya that caused hangs when using the USD Maya plugin. This can be enabled at build time by specifying the PXR_MAYA_TBB_BUG_WORKAROUND option to CMake.

  • Various other bug fixes and performance improvements.

[0.7.0] - 2016-08-01

Initial release