Materialx

Added
- Added the [MaterialX Graph Editor](https://github.com/AcademySoftwareFoundation/MaterialX/blob/main/documents/DeveloperGuide/GraphEditor.md), an example application for visualizing, creating, and editing MaterialX graphs.
- Added support for the [Metal Shading Language](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1258) in MaterialX shader generation and rendering.
- Added support for the [generalized_schlick_edf node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1262), enabling the expression of coated emissive surfaces.
- Added support for the [adobergb and lin_adobergb](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1118) color spaces in shader generation.
- Added uisoftmin and uisoftmax attributes to [mix nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1168) and [IOR inputs](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1151).
- Added support for [authored bitangent vectors](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1156) in GLSL, selected by the hwImplicitBitangents generator option.
- Added a [tangent input](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1157) to the glTF PBR shading model.
- Added a [Clang Format](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1174) step to GitHub Actions builds.
- Added support for [Xcode 14](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1326).

Changed
- Included the [standard data libraries](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1237) in MaterialX Python packages.
- Improved the [support library](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1184) and [node implementations](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1185) for OSL generation.
- Updated MDL shader generation to support [MDL 1.7](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1273).
- Improved the handling of [functional graphs](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1243) in MDL generation.
- Upgraded the [NanoGUI version](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1195) in the viewer to support Apple M1 builds.
- Upgraded the [Catch library](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1310) to version 2.13.9.

Fixed
- Fixed logic for [tangent basis orthogonalization](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1177) in generated GLSL.
- Fixed logic for [metallic F90](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1187) and an [opacity edge case](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1186) in UsdPreviewSurface.
- Fixed parsing of [inline source code variables](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1191) in node implementations.

Added
- Added new [Unified Noise](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1087), [Color Correct](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1086), and [Bump](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1085) nodes, providing artistic interfaces over the standard procedural, adjustment, and geometric primitives.
- Added shader generation support for the [MaterialX closures in OSL](https://github.com/AcademySoftwareFoundation/OpenShadingLanguage/releases/tag/v1.12.6.2), selected by a new [CMake build option](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1039).
- Added a shader translation graph from [Autodesk Standard Surface to glTF PBR](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1064).
- Added support for the [transmission_extra_roughness](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1079) input in the Standard Surface shading model.
- Added support for the [iridescence](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1055) inputs in the glTF PBR shading model.
- Added support for the [subsurface_bsdf](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1053) node in MDL.
- Added an [operationorder](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1027) input to the 'place2d' node.
- Extended the [mix](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1077) node to support multi-channel interpolators.
- Extended the [flattenSubgraphs](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1101) method to handle a broader range of graph structures.

Changed
- Improved the alignment of the [UsdPreviewSurface shading graph](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1082) with reference implementations.
- Improved the accuracy of the [thin-film BSDF](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1055) implementation in GLSL.
- Improved code generation for the [mix](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1104) node of 'surfaceshader' type.
- Removed [add and multiply](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1089) nodes for 'surfaceshader', 'volumeshader', and 'displacementshader' types.
- Refactored and extended the [Advanced Options](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1093) panel in MaterialXView.

Fixed
- Fixed the implementation of the [screen](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1111) compositing node in GLSL, OSL, and MDL.
- Fixed parent/child precedence in the [getGeometryBindings](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1113) function.
- Fixed [OpenGL errors](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1126) when unbinding geometry in MaterialXView on MacOS.

Added
- Added a [refraction approximation](https://github.com/AcademySoftwareFoundation/MaterialX/pull/918) for transmissive surfaces in GLSL, selected by the hwTransmissionRenderMethod generator option.
- Added support for generalized Schlick transmission in GLSL and OSL.
- Added support for code generation from material nodes.
- Added a specialization of GlslShaderGenerator for Vulkan GLSL generation.
- Added the [Chess Set](https://github.com/AcademySoftwareFoundation/MaterialX/pull/982) example from the [Karma: A Beautiful Game](https://www.sidefx.com/tutorials/karma-a-beautiful-game/) tutorial. Contributed to the MaterialX project by SideFX, original artwork by Moeen and Mujtaba Sayed.
- Added static and dynamic analysis tests to GitHub Actions builds.
- Added support for GCC 12, Clang 13, and Clang 14.

Changed
- Switched to [relative shader includes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/926) within the MaterialX data libraries, enabling custom folder names in distributions.
- Improved and extended the sample [Web Viewer](https://academysoftwarefoundation.github.io/MaterialX/).

Fixed
- Fixed math for normalizing normal and tangent vectors in GLSL.
- Fixed math for transforming a vector4 by a matrix in OSL.
- Fixed compatibility of OSL Worley noise with OSL 1.9.10.
- Fixed layering of thin-film effects in the Standard Surface shading model.
- Fixed input default values in the glTF PBR shading model.

Added
- Added [JavaScript bindings](https://github.com/AcademySoftwareFoundation/MaterialX/tree/main/javascript) for MaterialXCore, MaterialXFormat, and MaterialXGenGlsl.
- Added a sample [Web Viewer](https://academysoftwarefoundation.github.io/MaterialX/), built and deployed through GitHub Actions.
- Added a MaterialX graph for the [glTF PBR](libraries/bxdf/gltf_pbr.mtlx) shading model.
- Added new 'worleynoise2d' and 'worleynoise3d' nodes, with implementations in GLSL, OSL, and MDL.
- Added new 'surface_unlit' node, with implementations in GLSL, OSL, and MDL.
- Added support for the glTF geometry format in MaterialXRender and MaterialXView.

Changed
- Moved the MaterialX project to the [Academy Software Foundation GitHub](https://github.com/AcademySoftwareFoundation/MaterialX).
- Removed hardcoded references to "libraries" in calls to GenContext::registerSourceCodeSearchPath. (See Developer Notes below for additional details.)
- Improved the accuracy of mx_ggx_dir_albedo_analytic and mx_fresnel_conductor in GLSL.
- Updated the PyBind11 library to version 2.9.0.

Fixed
- Aligned GLSL and MDL implementations of 'fractal3d' with OSL.
- Fixed MDL implementations of 'sheen_bsdf' and 'thin_film_bsdf'.
- Fixed an error in code generation from multi-output node graphs.

Developer Notes
- This release removes hardcoded references to "libraries" in calls to GenContext::registerSourceCodeSearchPath within the MaterialX codebase. Applications with their own custom code generators should make the same change, removing hardcoded references to "libraries" in calls to GenContext::registerSourceCodeSearchPath. See pull request [877](https://github.com/AcademySoftwareFoundation/MaterialX/pull/877) for coding details.

Added
- Added an inheritance structure for versions of Autodesk Standard Surface.
- Added versioning and customization support to MaterialX namespaces in C++.
- Added preprocessor definitions for the API version to MaterialXCore.
- Added color transform methods to the Image class.
- Added an initial ClangFormat file for the MaterialX codebase.
- Added initial support for FreeBSD.
- Added support for Xcode 13.

Changed
- Refactored BSDF handling in shader generation, allowing for more flexible and efficient vertical layering.
- Optimized GLSL implementations for GGX specular, moving common computations to tangent space.
- Refactored the TextureBaker API for clarity and flexibility.
- Merged the ViewHandler and viewer camera into a new Camera class in MaterialXRender.
- Updated CMake configuration generation logic, adding handling for shared library builds.
- Updated the PyBind11 library to version 2.7.1

Fixed
- Fixed a performance regression in MaterialXView for multi-UDIM assets.
- Fixed a bug that caused shader inputs to be skipped in createUIPropertyGroups.
- Fixed the value of transmission roughness in UsdPreviewSurface.
- Fixed Vulkan compatibility for generated GLSL code.

Added
- Added an initial shader translation graph from Autodesk Standard Surface to UsdPreviewSurface.
- Added example script translateshader.py with validation in GitHub Actions.
- Added support for filename templates in texture baking.
- Added graph definitions for the MaterialX Lama node set.
- Added UI properties to the interface of UsdPreviewSurface.
- Added an initial ESSL shader generator.
- Added support for GCC 11.

Changed
- Improved the accuracy of directional albedo computations for GGX specular and Imageworks sheen.
- Updated default color space names to follow ACES 1.2 conventions (e.g. g22_rec709), while maintaining compatibility with legacy names (e.g. gamma22).

Fixed
- Fixed the default value of the roughness input of UsdPreviewSurface.
- Fixed the assignment of channel names in EXR files written through OpenImageIO.