10.7.x.x (relative to 10.7.1.3)

========

Improvements

------------

- MeshAlgo : Changed `reverseWinding()` so that the first vertex of each face remains unchanged. This matches the algorithm used in other DCCs.

Breaking Changes

----------------

- MeshAlgo : Changed the output of `reverseWinding()`.

10.7.1.3 (relative to 10.7.1.2)

========

Fixes

-----

- USDScene : Fixed loading of float-precision orientations from the `PointInstancer.orientationsf` attribute. Previously only the half-precision `orientations` attribute was supported.

10.7.1.2 (relative to 10.7.1.1)

========

Fixes

-----

- IECore.ls() : Fixed error when sequence started with `#`.

10.7.1.1 (relative to 10.7.1.0)

========

Fixes

-----

- ImageReader, TextureLoader : Removed special case for colorspaces when opening pngs.

10.7.1.0 (relative to 10.7.0.0)

========

Improvements

------------

- PathMatcher : Added `in()` and `containing()` methods.

- TypeId : Added `format_as` overload, so that TypeIds can be passed to `fmt::format()`.

- PrimitiveVariable : Added `format_as` overload for `Interpolation`, so that it can be passed to `fmt::format()`.

- AlembicScene : Added support for reading `P3d` and `N3d` GeomParams.

Build

-----

- LibFormat : Added compatibility with `fmt` 12.2.0.

- GCC : Added compatibility with GCC 14.

10.7.0.0

========

Features

--------

- PointInstancer : Added class to provide first-class encoding of point instancers.

- NanobindConverter : Added new class providing interoperability between Boost Python bindings and Nanobind bindings.

Improvements

------------

- PrimitiveVariable : Added Python bindings for `IndexedView` class.

- USDScene :

- Added support for writing `IECoreScene::PointInstancer` as `UsdGeomPointInstancer`.

- Added support for reading and writing mesh lights.

- Added support for pinned curves.

- CurvesPrimitive :

- Added `Wrap` enum, with `Periodic`, `NonPeriodic` and `Pinned`. This generalises the previous `periodic` boolean property.

- Added argument names to `variableSize()` and `numSegments()` Python bindings, so they can be passed as keywords.

- CurvesAlgo : Added `isPinned()` and `convertPinnedToNonPeriodic()` utilities.

- Primitive : Added default type to `variableData()` template method.

- Canceller :

- Derived from RefCounted, to allow Cancellers to be shared between multiple clients.

- Enabled chaining of Cancellers, via `addChild()` and `removeChild()` methods and a `ScopedChild` utility class.

- MessageHandler : Added `msg()` overload that accepts a `fmt::format_string` and arguments.

- InternedString : Added specialisation for `fmt::formatter<InternedString>`.

- TBB : Improved compatibility with oneTBB 2021.

- Ramp : Added Rampff, RampfColor3f, RampfColor4f and corresponding Ramp*Data classes, for representing user facing shader ramp parameters.

Fixes

-----

- RunTimeTyped : Fixed unnecessary overhead of `runTimeCast()` and `isInstanceOf()` for subclasses implemented in Python. The GIL is now never needed when the cast is to a C++ type.

- PrimitiveVariable : Made IndexedView `begin()` and `end()` const.

- PointsAlgo :

- Fixed loss of blind data in `deletePoints()`.

- Fixed loss of primitive type in `deletePoints()` (if processing a derived class of PointsPrimitive).

- CurvesAlgo :

- Fixed handling of periodic curves in `deleteCurves()`.

- Fixed `resamplePrimitiveVariable()` to handle Vertex<->Varying conversion for linear curves correctly.

- VDBObject : Fixed Python bindings for OpenVDB 12.

Breaking Changes

----------------

- ClassParameter, ClassVectorParameter : Replaced statically allocated TypeIds with ids allocated dynamically by `IECore.registerRunTimeTyped()`. If the id is needed from C++, it can be queried at runtime with `RunTimeTyped::typeIdFromTypeName()`.

- RunTimeTyped : Removed `typId` argument from `registerRunTimeTyped()` Python function. TypeIds are now always allocated dynamically for Python classes.

- USD :

- Removed support for `IECOREUSD_POINTINSTANCER_RELATIVE_PROTOTYPES` environment variable. Prototype paths are now always specified as relative where possible.

- Removed `./` prefix from relative prototype paths.

- UsdGeomPointInstancer `inactiveIds` are now merged into the `invisibleIds` primitive variable on loading, instead of being loaded separately.

- VDBObject : Removed support for OpenVDB 10.0 and earlier.

- CurvesPrimitive : Made protected members private.

- HenyeyGreenstein.h : Removed.

- SweepAndPrune.h : Removed.

- RadixSort.h : Removed.

- MessageHandler : Removed support for passing `boost::format` objects to `msg()`. Use `fmt::format()` instead.

- FileSequence : Removed `fileNameTemplate()` protected method. Use `fileNameForFrame()` instead.

- Canceller : Changed base class.

- IECore : Removed `tbb_task_scheduler_init()` Python Context Manager. Use `tbb_global_control()` instead.

- ShaderNetworkAlgo :

- Removed deprecated `componentConnectionAdapterLabel()`, `convertOSLComponentConnections()`, `collapseSplineParameters()`, `expandSplineParameters()` methods.

- Switched support for Spline parameters to support for Ramp parameters.

Build

-----

- LibFormat : Added new dependency on `fmt` 9.1.0.

- CI :

- Updated to GafferHQ/dependencies 11.0.0a8.

- Build artifacts and releases now include a "-platform##" suffix denoting their target VFX Reference Platform year. This replaces the "gcc" suffix previously used on Linux builds.

- USD : Added compatibility with USD 25.11 and 26.03.

- Boost : Removed unnecessary linking of `boost_chrono`.

10.6.7.x (relative to 10.6.7.2)

========

10.6.7.2 (relative to 10.6.7.1)

========

Fixes

-----

- USDScene : Fixed loading of float-precision orientations from the `PointInstancer.orientationsf` attribute. Previously only the half-precision `orientations` attribute was supported.

- IECore.ls() : Fixed error when sequence started with `#`.

10.6.7.1 (relative to 10.6.7.0)

========

Fixes

-----

- USDScene :

- Fixed bug writing shader assignments with `IECOREUSD_WRITE_CONFORMANT_RENDERMAN_ATTRIBUTES=1`.

- Fixed bug reading shader assignments with `IECOREUSD_WRITE_CONFORMANT_RENDERMAN_ATTRIBUTES=1`.

- Fixed bug reading legacy attributes with `IECOREUSD_WRITE_CONFORMANT_RENDERMAN_ATTRIBUTES=1`.

10.6.7.0 (relative to 10.6.6.0)

========

Improvements

------------

- USDScene : Added `IECOREUSD_WRITE_CONFORMANT_RENDERMAN_ATTRIBUTES` environment variable. If set to a value of `1`, this causes "ri:" prefixed attributes to be written as expected by `usdRiPxr`.

10.6.6.0 (relative to 10.6.5.0)

========

Improvements

------------

- USDScene : Added `IECOREUSD_WRITE_CONFORMANT_OSL_SHADERS` environment variable. If set to a value of `1`, this causes OSL shaders to be written in the format expected by RenderMan. Set the `RMAN_SHADERPATH` environment variable appropriately to ensure RenderMan can find the shaders.

10.6.5.0 (relative to 10.6.4.0)

========

Improvements

------------

- USDScene : Added loading of ArnoldProcedural prims as Cortex ExternalProcedural objects.

Fixes

-----

- USDScene : Fixed writing of animated camera parameters.

10.6.4.0 (relative to 10.6.3.1)

========

Improvements

------------

- USDScene : Added prim path to warnings when reading curves and meshes.

10.6.3.1 (relative to 10.6.3.0)

========

Fixes

-----

- USDScene : Fixed handling of connections involving UsdShadeNodeGraph interface parameters.

10.6.3.0 (relative to 10.6.2.2)

========

Improvements

------------

- ShaderNetworkAlgo : Added render adaptor API, allowing just-in-time modifications to

ShaderNetworks during translation for rendering.

10.6.2.2

========

Fixes

-----

- CoordinateSystem : Added backwards compatibility for legacy transform.

10.6.2.1 (relative to 10.6.2.0)

========

Fixes

-----

- USDScene : Fixed reading of animated parameters on materials and lights.

- Boost : Fixed compatibility with Boost 1.85.

Build

-----

- SConstruct : Added `INCLUDE_PATHS` option.

10.6.2.0 (relative to 10.6.1.0)

========

Improvements

------------

- ShaderNetwork : Optimised applySubstitutions() for cases where not all shaders need them.

- CurvesPrimitiveEvaluator : Added accessors for getting interpolation coefficients and data indices from Result.

Fixes

-----

- ShaderNetwork::hashSubstitutions : Fixed shader string substitutions that are escaped with backslashes (ie. `myText\<substitutionHandledByArnold\>`).

10.6.1.0 (relative to 10.6.0.2)

========

Improvements

------------

- ShaderNetworkAlgo : Added support for RenderMan's spline convention in `expandSplines()` and `collapseSplines()`.

Fixes

-----

- ConfigLoader : Fixed UnicodeDecodeErrors in non-UTF8 locales.

- USDScene : Fixed identifiers for exported RenderMan shaders, by omitting the `ri:` type prefix.

10.6.0.2 (relative to 10.6.0.1)

========

Fixes

-----

- DisplayDriverServer : Fixed to support IPv4-only environments.

API

---

- TypeIds : Claimed range for AtomsGaffer.

10.6.0.1 (relative to 10.6.0.0)

========

Fixes

-----

- USDScene : Worked around numerical imprecision when converting between time and UsdTimeCode.

Build

-----

- CI : Updated to GafferHQ/dependencies 10.0.0.

10.6.0.0 (relative to 10.5.15.2)

========

Improvements

------------

- RefCounted, RunTimeTyped : Inlined constructor and destructor.

Fixes

-----

- USDScene :

- Fixed writing of shutter values from cameras without a `shutter` parameter. The `shutter:open` and `shutter:close` attributes are now omitted instead of being written with Cortex's default -0.5, 0.5 shutter values.

- Fixed reading of shutter values from cameras without `shutter:open` and `shutter:close` attributes. The `shutter` parameter is now omitted instead of being created with USD's default 0, 0 shutter values.

- CurvesPrimitiveEvaluator : Fixed error in `Result::vTangent()` function causing tangent to point in opposite direction for curves with `Linear` interpolation.

Breaking Changes

----------------

- Renderable : Removed `render()` method.

- CoordinateSystem : Removed transform.

- Font : Removed `meshGroup()` method.

- Options, Group, Transform, MatrixTransform, MatrixMotionTransform, AttributeState, Light, MotionPrimitive : Removed.

- CurveExtrudeOp, IDXReader : Removed.

- PreWorldRenderable, StateRenderable : Removed. All derived classes now derive directly from Renderable.

- Renderer, AttributeBlock, EditBlock, MotionBlock, TransformBlock, WorldBlock : Removed.

- IECoreHoudini : Removed.

- IECoreMaya : Removed.

- IECoreNuke : Removed.

- Removed support for `IECORE_RTLD_GLOBAL` environment variable.

- SmoothSkinningData : Removed, along with all associated Ops and Parameters.

10.5.x.x (relative to 10.5.16.0)

========

10.5.16.0 (relative to 10.5.15.4)

=========

Improvements

------------

- ShaderNetworkAlgo : Added render adaptor API, allowing just-in-time modifications to

ShaderNetworks during translation for rendering.

10.5.15.4 (relative to 10.5.15.3)

========

Improvements

-----

- IECoreUSD: Added support for root level tags (reading/writing) to our IECoreUSD::SceneCacheData plugin.

Fixes

-----

- IECoreUSD: Fixed crash when using invalid file path with IECoreUSD::SceneCacheFileFormat.

10.5.15.3 (relative to 10.5.15.2)

=========

Fixes

-----

- USDScene : Worked around numerical imprecision when converting between time and UsdTimeCode.

10.5.15.2 (relative to 10.5.15.1)

=========

Fixes

-----

- VDBObject : Fixed worldBound() result when bbox metadata not already present.

API

---

- SConstruct : Install "private" headers.

- VDBObject : Marked metadata() as deprecated.

10.5.15.1 (relative to 10.5.15.0)

=========

Fixes

-----

- USDScene : Fixed reading of bounds from prims with `extentsHint` and model `kind` but without UsdGeomModelAPI applied.

10.5.15.0 (relative to 10.5.14.1)

=========

Improvements

------------

- USDScene : Added loading of ArnoldAlembic, ArnoldUsd and ArnoldProceduralCustom prims as Cortex ExternalProcedural objects.

Fixes

-----

- USDScene : Fixed loading of instanced UsdSkel geometry with unique animation applied.

10.5.14.1 (relative to 10.5.14.0)

=========

Fixes

-----

- Boost : Fixed compatibility with Boost 1.82.

10.5.14.0 (relative to 10.5.13.1)

=========

Features

--------

- ObjectMatrix : Added new class providing an object that holds a matrix of child objects.

Fixes

-----

- Alembic : Fixed crashes caused by invalid UVs.

10.5.13.1 (relative to 10.5.13.0)

=========

Fixes

-----

- USD : Fixed compatibility with USD 25.05.

10.5.13.0 (relative to 10.5.12.0)

=========

Features

--------

- PointInstancerAlgo : Added support for the env var IECOREUSD_POINTINSTANCER_RELATIVEPROTOTYPES. If this is set to "1", then when USD PointInstancers are loaded as point clouds, if they contain prototype paths beneath themselves in the hierarchy, those prototype paths will be loaded as relative paths, starting with "./". This aligns with how Gaffer will now handle prototype paths, and allows point instancers to be relocated in the hierarchy.

Fixes

-----

- USDScene :

- Fixed timecodes used when writing animated attributes.

- Fixed timecodes used when writing animated bounds.

10.5.12.0 (relative to 10.5.11.0)

========

Features

--------

- IECoreImage::DisplayDriverServer: Adds option to display server to client driver to write to the same display driver.

Fixes

-----

- IECore : Fixed bug that was causing imath vectors and colors with values of `inf` / `std::numeric_limits<float>::infinity()` to be serialised in a way that could not be evaluated with `eval()`.

Build

-----

- CI :

- IECoreHoudini.LiveSceneTest : Reverted recent update since #1441 made it unnecessary.

10.5.11.0 (relative to 10.5.10.0)

=========

Improvements

------------

- OpenImageIOAlgo::DataView : Added support for Int64Data, UInt64Data, Int64VectorData and UInt64VectorData.

- IECoreHoudini : Updated to support Houdini 20.0 and 20.5.

- IECoreMaya : Avoid compilation warnings with new gcc.

Fixes

-----

- MeshAlgo::MeshSplitter/segment : Fixed so that we now preserve vertex order while splitting. This matches the old behvaviour before 1.4.6.0 when segment was optimized. This doesn't affect the correctness of the result, but is a better convention to match user expectations - when combining meshes followed by splitting, it's better if you get back the same vertex ids you started with.

Build

-----

- SConstruct :

- Added `PYBIND11_INCLUDE_PATH` option.

- Added `VDB_PYTHON_PATH` to USD tests.

- Added `INSTALL_CREATE_SYMLINKS`, which allows you to disable the creation of version symlinks at the end of the install.

- Added `USG_SHIMLIB_PATH` which may be necessary to run nuke tests.

- CI :

- IECoreHoudini tests updated to pass on newer environments.

- IECoreGL tests updated with relaxed precisions for image comparisons.

- Updated to GafferHQ/dependencies 9.0.0.

- Updated Windows build to use MSVC 2022.

10.5.10.0 (relative to 10.5.9.5)

=========

Improvements

------------

- USDScene : PointInstancers are now loaded with `invisibleIds` and `inactiveIds` as primitive variables.

- IECoreUSD::DataAlgo :

- Made `valueTypeName` argument to `fromUSD( const VtValue & )` optional. This allows VtValue to be converted without having additional type information available.

- Added conversions between `VtDictionary` and `CompoundData`.

- IECoreUSD::ShaderAlgo :

- Stopped writing `cortex_autoAdaptor` metadata, which would cause errors in DCCs without the definition registered.

- Added round-tripping of all blind data stored on Shaders.

- IECoreScene::ShaderNetworkAlgo : Added a mechanism for customising the adapter shaders used by `addComponentConnectionAdapters()`.

10.5.9.5 (relative to 10.5.9.4)

========

Fixes

-----

- USDScene : Fixed crash loading skinned facevarying normals (bug introduced in 10.5.9.3).

10.5.9.4 (relative to 10.5.9.3)

========

Fixes

-----

- USDScene : Fixed crash loading a Volume with an empty field.

10.5.9.3 (relative to 10.5.9.2)

========

Fixes

-----

- USDScene :

- Fixed crash attempting to write to a file that is already open for reading. An exception is now thrown instead.

- Fixed loading of skinned facevarying normals.

- `lightLink` and `shadowLink` collections on UsdLuxLightAPI are no longer treated as sets.

- Version.h : Fixed `*Version()` functions to return the runtime version of the library, not the version that client code was compiled with. Use the `CORTEX_*_VERSION` macros for compile time checks.

- IECoreUSD : Asset and volume paths now use `/` in the resolved path on all operating systems. This behavior can be disabled by setting the `IECOREUSD_FORCE_ASSET_PATH_FORWARD_SLASH` environment variable to a value of `0`.

10.5.9.2 (relative to 10.5.9.1)

========

Fixes

-----

- USDScene :

- Fixed round-tripping of colons in set names.

- Fixed `hash()` to consider animation on ModelAPI extents when hashing the bound.

- ToMayaMeshConverter : Reverted #1386 that no longer locked normals set on the Mesh from the scc to fix issues with Maya incorrectly recomputing normals as Vertex normals when they were originally computed as Face normals.

- CurvesAlgo : Fixed `resamplePrimitiveVariables()` for use with periodic curves.

10.5.9.1 (relative to 10.5.9.0)

========

Fixes

-----

- OpenImageIOAlgo : Fixed `data()` handling of arrays of type `TypeDesc::CHAR`, `TypeDesc::UCHAR`, `TypeDesc::USHORT`, `TypeDesc::SHORT`, `TypeDesc::UINT` and `TypeDesc::HALF`. Among other things, this fixes the round-tripping of ICC profiles in ImageReader/ImageWriter.

10.5.9.0 (relative to 10.5.8.0)

========

Improvements

------------

- USDScene : `hasBound()` and `readBound()` now use `UsdGeomModelAPI` extents hints if they are available. This behaviour can be disabled by setting the `IECOREUSD_USE_MODELAPI_BOUNDS` environment variable to a value of `0`.

10.5.8.0 (relative to 10.5.7.1)

========

Improvements

------------

- IECoreUSD::DataAlgo : Added binding for `toUSD()` function.

Fixes

-----

- ShaderNetworkAlgo : Fixed crash caused by cyclic connections in `removeUnusedShaders()`.

- ShaderStateComponent : Fixed GL rendering failures caused by unsupported values for texture parameters.

- USDScene :

- Fixed exceptions caused by attempt to write shader parameters with unsupported value types.

- Fixed duplicate loading of `arnold:*` primvars on lights as attributes. These are now only loaded as parameters on the light shader.

- IECoreUSD::DataAlgo : Fixed exceptions thrown by `toUSD()` and `valueTypeName()` when passed datatypes not supported by `dispatch()`. An empty VtValue or SdfValueTypeName is now returned instead.

Build

-----

- CI : Updated to GafferHQ/dependencies 8.0.1.

10.5.7.1 (relative to 10.5.7.0)

========

Fixes

-----

- USDScene :

- Adding mapping of `arnold:*` light parameters to and from the non-standard `primvars:arnold:*` attributes preferred by the `arnold-usd` project.

- Fixed writing of `treatAsPoint` and `treatAsLine` light parameters, which were being written as generic `inputs:*` attributes and not the specific

attributes defined by the SphereLight and CylinderLight schemas.

10.5.7.0 (relative to 10.5.6.2)

========

Features

--------

- MeshPrimitive : Added `interpolateBoundary`, `faceVaryingLinearInterpolation` and `triangleSubdivisionRule` properties for controlling the shape of the subdivision limit surface.

Fixes

-----

- MeshPrimitive : Removed `interpolation` from topologyHash. The topologyHash should only include things which affect the layout of primitive variables.

10.5.6.2 (relative to 10.5.6.1)

========

Fixes

-----

- USDScene : Fixed round-tripping of `ai:light` shader type for the output shader of light networks.

10.5.6.1 (relative to 10.5.6.0)

========

Fixes

-----

- USDScene : Fixed round-tripping of `__lights` set membership for non-UsdLux lights.

- DisplayDriverServer : Fixed delays connecting to the server on Windows.

Build

-----

- SConstruct : Support detection of OpenEXR versions with a patch version containing multiple digits.

- Fixed building with MSVC and Gaffer Dependencies 8.x.

10.5.6.0 (relative to 10.5.5.0)

========

Improvements

------------

- `IECoreGL::Selector`: Added constructor overload that accepts a boolean indicating a more precise, camera-space depth sample will be used to sample depth instead of OpenGL's depth buffer.

- `IECoreGL::ColorTexture`: Added new constructor that accepts an argument specifying the internal storage format to use.

10.5.5.0 (relative to 10.5.4.2)

========

Features

--------

- PyBindConverter : Added new class providing interoperability between Boost Python bindings and PyBind11 bindings.

Improvements

------------

- USDScene : Added basic loading of UsdGeomNurbsCurves, converting them to CurvesPrimitives.

- OStreamMessageHandler : Added level prefix to every line.

Fixes

-----

- CompoundObject : Fixed crashes in Python bindings caused by passing `None` as a key.

- VDBObject : Fixed Python bindings for OpenVDB 10.1.

10.5.4.2 (relative to 10.5.4.1)

========

Fixes

-----

- ExceptionAlgo : Fixed memory leak in `translatePythonException()`, which was failing to manage the reference count for exceptions bound by `IECorePython::ExceptionClass`.

10.5.4.1 (relative to 10.5.4.0)

========

Fixes

-----

- OpenImageIOAlgo : Properly handle empty metadata values.

10.5.4.0 (relative to 10.5.3.0)

========

Improvements

------------

- ShaderNetwork : Added support for InternedStringData attributes in string parameter substitutions.

- MurmurHash : Added specialisation for `std::hash`, among other things allowing the use of MurmurHash as a key in `unordered_map`.

- CompoundObject : Defaulted template argument to `Object` in `member()` methods.

10.5.3.0 (relative to 10.5.2.1)

========

Improvements

------------

- OpenImageIOAlgo : Added support for `InternedStringVectorData` to `DataView`.

Build

-----

- Windows : Fixed include order.

10.5.2.1 (relative to 10.5.2.0)

========

Build

-----

- SConstruct : Make sure VDB includes can be found

- USDScene : Fix build for older USD versions

10.5.2.0 (relative to 10.5.1.0)

========

Improvements

------------

- USD PrimitiveAlgo : Added `readPrimitiveVariable()` utility method for reading from regular `UsdAttributes`.

- USDScene : Added support for reading from in-memory stages by passing a filename of the form `stageCache:{id}.usd` where `{id}` specifies a stage which has been inserted in the `UsdUtilsStageCache`.

Fixes

-----

- USDScene :

- Fixed handling of invalid values on the following attributes :

- PointBased : `positions`, `normals`, `velocities`, `accelerations`.

- Curves : `widths`.

- PointInstancer : `ids`, `protoIndices`, `orientations`, `scales`, `velocities`, `accelerations`, `angularVelocities`.

- Points : `ids`, `widths`.

Invalid values are now ignored with a warning, instead of loading as invalid primitive variables.

- Fixed treatment of unconnected material outputs during reading. If they were "authored" but not connected to a source, they were incorrectly being treated as valid attributes, and loading as empty ShaderNetworks which caused problems elsewhere.

- ToMayaMeshConverter : No longer locks normals set on the Mesh from the scc.

Breaking Changes

----------------

- IECoreMaya : Maya meshes converted from Cortex data no longer have normals set explicitly and instead relies on Maya to calculate them.

10.5.1.0 (relative to 10.5.0.0)

========

Improvements

------------

- USDScene : Added limited support for reading and writing `Volume` prims via `IECoreVDB::VDBObject`.

Fixes

-----

- USDScene : Fixed writing of lights so they are represented as appropriate `UsdLux*Light` prims in USD.

- FrameRange : Prevented creation of FrameRanges with negative steps

- IECore.dataTypeFromElement : Fixed support for list to Vector conversions

- LinkedScene : Fixed bug where `linkLocations` attribute was baked incorrectly if the link target location wasn't the ROOT

- This in turn caused LinkedScene::setNames() and LinkedScene::readSet() to error

- IECoreNuke::FromNukePointsConverter : Use `Color3f` instead of `Color4f` to be compatible with `Gaffer`

- IECoreNuke::SceneCacheReader : Fixed crash with `SceneCacheReader` when widget updates while Caribou updates

10.5.0.0 (relative to 10.4.10.0)

========

Features

--------

- MeshAlgo :

- Added new algorithms for computing mesh normals : `calculateUniformNormals()`, `calculateVertexNormals()` and `calculateFaceVaryingNormals()`.

- Added `correspondingFaceVertices()` method.

Improvements

------------

- MeshAlgo `distributePoints()` :

- Added support for density primitive variable values above 1.

- Added sampling of arbitrary primitive variables via the new `primitiveVariables` parameter.

- Improved accuracy.

- Improved performance.

- MeshAlgo `triangulate()` : Improved performance.

- MeshAlgo `connectedVertices()` : Improved performance.

Fixes

-----

- MeshAlgo `distributePoints()` :

- Fixed duplicate points at triangle edges.

- Fixed handling of points exactly at the density threshold.

- TriangleAlgo :

- `triangleClosestBarycentric()` : Fixed numerical precision bug.

- `triangleContainsPoint()` : Fixed handling of zero-area triangles.

- PolygonVertexIterator : Fixed to use `std::iterator_traits` so that raw pointers are supported.

Breaking Changes

----------------

- IECoreAppleseed : Removed. With Appleseed's removal from Gaffer `1.3.0.0` Cortex no longer provides IECoreAppleseed.

- Python : Removed support for Python 2.

- Primitive : Changed `variableIndexedView()` return type from `boost::optional` to `std::optional`.

- MeshAlgo `distributePoints()` :

- Changed function signature.

- Bug fixes mean subtle changes to the resulting points.

10.4.10.3 (relative to 10.4.10.2)

=========

Fixes

-----

- USDScene : Fixed treatment of unconnected material outputs during reading. If they were "authored" but not connected to a source, they were incorrectly being treated as valid attributes, and loading as empty ShaderNetworks which caused problems elsewhere.

10.4.10.2 (relative to 10.4.10.1)

=========

Fixes

-----

- LinkedScene : Fixed bug where `linkLocations` attribute was baked incorrectly if the link target location wasn't the ROOT

- This in turn caused LinkedScene::setNames() and LinkedScene::readSet() to error

- IECoreNuke::FromNukePointsConverter : Use `Color3f` instead of `Color4f` to be compatible with `Gaffer`

- IECoreNuke::SceneCacheReader : Fixed crash with `SceneCacheReader` when widget updates while Caribou updates

10.4.10.1 (relative to 10.4.10.0)

========

Fixes

-----

- FrameRange : Prevented creation of FrameRanges with negative steps

- IECore.dataTypeFromElement : Fixed support for list to Vector conversions

10.4.10.0 (relative to 10.4.9.1)

========

Improvements

------------

- IECoreNuke::LiveScene :

- Adding caching to speed up querying Nuke's GeometryList for large hierarchy

- Support for `ParticleSprite`

- `setOp` method to avoid re creating `LiveScene` from scratch

Fixes

-----

- IECoreMaya.SceneShape : Fixed reading of time samples for expanded link locations

- Traverse the time plug connections to check for a maya global time connection

- CheckedGILRelease : Safe to call if thread doesn't hold the GIL

- IECoreNuke::SceneCacheReader : release GIL during `_validate` to avoid crash with Caribou

- IECoreNuke::LiveScene :

- Fix crash when there is not input `GeoOp`.

- Fix uninitialized bounds

- Fix bug with duplicated parents

- Fix bug when querying children combined between multiple parents

10.4.9.1 (relative to 10.4.9.0)

========

Fixes

-----

- USDScene : Fixed hash clashes when the same USD file containing instanceable prims was opened a second time. Because USD doesn't assign prototypes deterministically, hashes would be shuffled between prototypes, yielding inconsistencies between the hashes for the two scenes. Hashes are now completely unique from scene-to-scene, so no locations can have clashing hashes.

10.4.9.0 (relative to 10.4.8.0)

========

Improvements

------------

- USDScene :

- Improved performance of `setNames( includeDescendantSets = True )` substantially for compositions with instanced prims.

- Improved performance of `readSet( includeDescendantSets = True )` substantially for compositions with instanced prims.

- Improved performance when reading materials from instanced prims.

- Added loading of `UsdGeomCube` prims (as MeshPrimitives).

- SceneInterface : Added `_copy` argument to Python bindings for `readAttribute()`, `readTransform()` and `readObject()`. Pass `_copy = False` to receive the original constant result directly instead of a mutable copy. Use with care (typically only for debugging and testing)!

- TypedData : Added move constructors.

Fixes

-----

- USDScene :

- Fixed loading of `__cameras`, `__lights` and `usd:pointInstancers` sets from within instanced prims.

- Fixed cancellation when reading `UsdGeomSphere` prims.

10.4.8.0 (relative to 10.4.7.1)

========

Improvements

------------

- USDScene : Exceptions thrown by `child()` are now more descriptive.

Fixes

-----

- USDScene : Fixed `hasChild()` bug which considered prims to be children when `child()` and `childNames()` did not.

10.4.7.1 (relative to 10.4.7.0)

========

Fixes

-----

- USDScene :

- The UsdShadeMaterialBindingAPI schema is now applied to all prims with material bindings, making the written files compatible with `USD_SHADE_MATERIAL_BINDING_API_CHECK=strict` mode.

- Fixed loading of USDGeomXformable's `ResetXformStack` operator.

10.4.7.0 (relative to 10.4.6.0)

========

Improvements

------------

- IECoreGL::PointsPrimitive : Added `renderUsesGLPoints()` method (#1347).

- IECoreGL::CurvesPrimitive : Added `renderUsesGLLines()` method (#1347).

- StringAlgo : Added `concat()` and `toInt()` methods (#1343).

- IECoreScene::ShaderNetworkAlgo (#1343) :

- Added `convertToOSLConventions()`, `expandSplines()` and `collapseSplines()`.

- Deprecated `convertOSLComponentConnections()`, `expandSplineParameters()` and `collapseSplineParameters()`.

- USDScene : Added support for roundtripping connections to SplineData parameters.

Fixes

-----

- IECoreUSD::PrimitiveAlgo (#1346) :

- Fixed reading of primitives containing `primvars:normals`. These are now correctly loaded as a primitive variable called `N`, taking precedence over the UsdGeomPointBased `normals` attribute.

- Fixed writing of indexed normals so that the indexing is retained on load. Note that this means that normals are now _always_ written as `primvars:normals` and never via the UsdGeomPointBased `normals` attribute.

10.4.6.0 (relative to 10.4.5.0)

========

Features

--------

- MeshAlgo : Added new MeshSplitter class, for efficient splitting meshes based on uniform primitive variables.

- ImathHash : Added new header that defines `std::hash` for Imath types.

Improvements

------------

- PointsPrimitive, Primitive : Accelerated bounds computation using `tbb::parallel_reduce`.

- MeshAlgo : Improved performance of `segment()`.

Fixes

-----

- ImageReader : Fixed compilation with versions of OIIO < 2.4.

- USDScene : Invalid primitive variables are now skipped during loading, with a warning being emitted instead.

- MeshAlgo : Fixed crease handling in `deleteFaces()`.

Build

-----

- Updated CI builds to use GafferHQ/dependencies version `6.0.0`, making them suitable for use in Gaffer `1.2.x.x`.

10.4.5.0 (relative to 10.4.4.0)

========

Improvements

------------

- CurvesAlgo, MeshAlgo, PointsAlgo : `resamplePrimitiveVariable()` now supports all data types when resampling a `Constant` primitive variable.

Build

-----

- Update Windows release build dependencies to 6.2.1.

- Added compatibility with OpenImageIO 2.4.

10.4.4.0 (relative to 10.4.3.1)

========

Improvements

------------

- USD :

- Added loading of `float4` USD shader parameters as `Color4` parameters.

- Added support for Arnold-USD's convention for representing connections to individual indices of an array.

Build

-----

- Added compatibility with USD 23.02.

- Updated Windows dependencies to 6.2.1.

10.4.3.1 (relative to 10.4.3.0)

========

Fixes

---

- IECoreMaya.SceneShapeSubSceneOverride : Visibility override fixes (#1320).

- Removed SceneInterface visibility check, as it is now obsolete and causing issues.

- Check visibility for root locations, so bounds aren't incorrectly drawn.

- VDBObject : Fixed infinite recursion in isEqualTo() (#1314).

10.4.3.0 (relative to 10.4.2.1)

========

Features

--------

- IECoreNuke : Add LiveScene support for Nuke (#1310).

- LiveSceneKnob : Knob to interface with LiveScene from Python.

- LiveSceneHolder : Node to hold LiveSceneKnob to provide a Python interface with LiveScene.

- IECoreMaya : Add non-drawable `ieSceneShapeProxy` subclassed from `ieSceneShape` (#1311).

Improvements

------------

- Added string constructor and static `fromString` function to `IECore.MurmurHash`.

Fixes

-----

- IECoreUSD : Fixed error in `pluginfo.json` preventing USD on Windows from loading `IECoreUSD.dll`.

- IECoreScene : Fixed MeshPrimitiveEvaluator assert typo.