Materialx

Added

- Added support for [environment light intensity](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1737) in generated GLSL shaders.

Changed

- Removed an [extra suffix](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1744) from element names in texture baking.

Fixed

- Moved environment prefilter functions to their [referencing GLSL files](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1748), addressing shader compilation errors in USD.
- Enabled color and unit transforms on [root nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1757) in shader generation, addressing missing color transforms in USD.
- Updated [document caches](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1753) to store elements in declaration order, addressing compiler-dependent behavior in nodedef lookups.
- Switched to [framework linkage](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1752) for OpenGL libraries on MacOS, addressing build issues in downstream projects.
- Switched to [legacy OpenGL libraries](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1766) for Python wheels on Linux, addressing missing OpenGL functionality in Python wheels.
- Added a [missing vertex data prefix](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1762) in Vulkan GLSL shader generation.

Added

- Added an initial NPR (non-photorealistic rendering) data library to MaterialX, supporting the [View Direction](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1631), [Facing Ratio](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1671), and [Gooch Shading](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1674) nodes.
- Added new nodes to the standard data library, including [Reflect](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1690), [Refract](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1698), [Safe Power](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1689), [Create Matrix](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1553), and [Round](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1678).
- Added support for the generation of [pre-filtered environment maps](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1420) in MaterialX GLSL and MSL.
- Added support for [geometry drag & drop](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1663), [frame capture](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1636), [UI ranges](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1623) and [enumerated values](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1632) in the MaterialX Web Viewer.
- Added [floating popups](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1565) for hovered pins in the MaterialX Graph Editor.
- Added [UI ranges](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1646) to the 'useSpecularWorkflow' and 'normal' inputs of the UsdPreviewSurface shading model.
- Added [versioning rules](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1664) for the MaterialX API and data libraries to the developer guide.
- Added initial C++ [fuzz tests](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1605) and [coverage tests](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1548) to GitHub Actions CI.
- Added [GCC 13, Clang 15](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1602), and [Python 3.12](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1588) builds to GitHub Actions CI.

Changed

- Enabled the [new OSL closures](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1702) by default in shader generation, with the MATERIALX_OSL_LEGACY_CLOSURES flag used to request legacy closures.
- Updated the MaterialX Web Viewer to [three.js r152](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1615).
- Switched to a more efficient representation of [HDR images](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1616) in the MaterialX Web Viewer.
- Improved the logic for [connecting pins](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1569) in the MaterialX Graph Editor.
- Improved the handling of [filename inputs](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1547) in OSL shader generation.
- Reduced the size of the MaterialX data libraries, improving the use of [graph definitions](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1653) and merging [duplicate implementations](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1642).
- Raised the minimum CMake version to [CMake 3.16](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1607).
- Updated the C++ unit test library to [Catch 2.13.10](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1566).

Fixed

- Fixed the attenuation of [coated emission](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1534) in the Standard Surface shading model.
- Fixed the implementation of the [overlay node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1539) in shader generation.
- Fixed an edge case for [type pointer comparisons](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1665) in shader generation.
- Fixed an edge case for [transform nodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1560) in GLSL and MSL shader generation.
- Fixed the implementation of [mx_hsvtorgb](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1584) in MDL shader generation.
- Fixed [orphaned links](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1667) when deleting nodes in the MaterialX Graph Editor.
- Fixed [scroll wheel interactions](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1578) across windows of the MaterialX Graph Editor.
- Fixed the generation of unused [imgui.ini files](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1570) in the MaterialX Graph Editor.
- Fixed a dependency on [module import order](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1595) in MaterialX Python.
- Fixed an [off-by-one index check](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1582) in Element::setChildIndex.
- Fixed a [missing null check](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1601) in Graph::propertyEditor.
- Fixed cases where [absolute paths](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1603) were stored in MaterialXConfig.cmake.

Added
- Added a broad set of new pattern nodes to MaterialX, including [Circle, Hexagon, Cloverleaf, Line, Grid, Crosshatch](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1411), [Checkerboard](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1328), [Random Color, Random Float](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1330), [Triangle Wave](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1334), [Integer Floor, Integer Ceiling](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1362), and [Distance](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1333).
- Added support for [MaterialX builds on iOS](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1435).
- Added support for [drag-and-drop import](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1482) of MaterialX files in the [Web Viewer](https://academysoftwarefoundation.github.io/MaterialX/).
- Added generation of [MaterialX Python wheels](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1317) in GitHub Actions, enabling the distribution of MaterialX Python packages through PyPI.
- Added support for the [lin_displayp3 and srgb_displayp3](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1368) colorspaces in shader generation.
- Added support for the [blackbody PBR node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1367) in shader generation.
- Added support for [displacement](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1396) in MDL generation.
- Added [blend](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1350) and [up-axis](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1489) controls to the triplanar projection node.
- Added version details to [shared libraries](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1447) on Windows.
- Added a [MacOS 13](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1375) build to GitHub Actions.

Changed
- Raised the minimum C++ version for MaterialX builds to [C++14](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1340).
- Upgraded the [PyBind11 library](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1343) to version 2.10.4, raising the minimum Python version to 3.6, and enabling support for Python versions 3.11 and beyond.
- Improved the performance and convergence of [GGX importance sampling](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1390) in GLSL generation, leveraging insights from the HPG 2023 paper by Jonathan Dupuy and Anis Benyoub.
- Improved [property panel display](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1346) in the MaterialX Graph Editor.
- Improved [node spacing](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1476) in the MaterialX Graph Editor.
- Improved the robustness of [MaterialX unit tests](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1370) with respect to the current working directory.
- Simplified the handling of [default colors](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1452) in GLSL generation, removing dynamic branches on texture size.
- Simplified the definitions of the [default color transforms](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1352), implementing them as language-independent MaterialX graphs.
- Simplified the interface of [ShaderGenerator::emitFunctionCall](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1344), marking its original interface as deprecated.
- Marked legacy interfaces for [findRenderableElements and findRenderableMaterialNodes](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1340) as deprecated, making their usage visible to clients as compiler warnings.
- Moved the MaterialX specification to [public Markdown files in GitHub](https://github.com/AcademySoftwareFoundation/MaterialX/tree/main/documents/Specification), enabling direct contributions from the community.

Fixed
- Fixed brightness artifacts in the [triplanar projection node](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1350).
- Aligned default values for [conductor_bsdf](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1379) with the MaterialX specification.
- Fixed [volume mixing](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1395) in MDL generation.
- Fixed a bug to improve [shader generation determinism](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1376).
- Fixed a bug to improve the [consistency of auto layout](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1389) in the MaterialX Graph Editor.
- Fixed a bug to enable [multi-output connection edits](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1506) in the MaterialX Graph Editor.
- Fixed a bug in [dot node optimizations](https://github.com/AcademySoftwareFoundation/MaterialX/pull/1522) for shader generation.

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.