Version 1.39.3

Added

• Added support for the fract node, with implementations in GLSL, OSL, and MDL.
• Added a bitangent input to the bump node, aligning its feature set with the normalmap node.
• Added support for OSL 1.14 in shader generation, leveraging the latest closures when available.
• Added support for MDL 1.10 in shader generation, leveraging the latest closures when available.
• Added initial support for data library builds, allowing future releases to generate derived artifacts from the MaterialX data libraries.
• Added an ElementVec type alias in MaterialX C++, allowing certain patterns to be expressed more clearly and concisely.

Changed

• Improved the compatibility of MaterialX shader generation with Hydra Storm.
• Refactored the type system in shader generation, improving the thread-safety and robustness of the generation process.
• Improved the implementations of the BSDF operator nodes, preferring data definitions over explicit C++ code.
• Improved the implementations of the time node, using a graph definition in hardware shading languages.
• Optimized GitHub CI to reduce build times for contributors.
• Raised the minimum CMake version to CMake 3.26.

Fixed

• Fixed two edge cases in the version upgrade logic for normalmap nodes, addressing the usage of MaterialX versioning in OpenUSD.
• Fixed tangent frame orthogonalization for the normalmap node in OSL shader generation.
• Added validation of tree depth and XInclude depth in XML parsing, addressing cases where unusually complex documents could trigger a stack overflow.
• Adding two missing null checks in the getShaderNodes helper function.
• Integrated fixes to OSL type classes from recent work in the OSL project.
• Improved the handling of invalid materials in the MaterialX Viewer, addressing cases where missing lights could trigger a crash.

Version 1.39.2

Added

• Added support for the Chiang Hair BSDF, with initial implementations in hardware shading languages and MDL.
• Added support for the Disney Principled shading model, implemented as a language-independent graph.
• Added support for generic color ramps, using a graph-based ramp node with ten control points.
• Added support for Worley noise with solid cells, opening up new artistic options for metal flake shaders.
• Added support for data library referencing, enabling improved performance in shader generation.
• Added support for custom structure types in MaterialX.
• Added support for functional equivalence tests between MaterialX elements.
• Added support for geompropvalueuniform nodes, improving functional parity between MaterialX and USD.
• Added support for transmission effects in the translation graph from Standard Surface to glTF PBR.
• Added support for coated emission in the translation graph from Standard Surface to UsdPreviewSurface.
• Added support for Apple framework builds.
• Added support for MDL 1.9 in shader generation.
• Added support for viewdirection space in hardware shading languages.
• Added support for image downsampling in MaterialXRender.
• Added support for image difference statistics in render tests.
• Added a combined version define to MaterialX C++.
• Added a release signing workflow to GitHub Actions.
• Added documentation for keyboard shortcuts in the MaterialX Viewer.

Changed

• Improved the performance of graph traversal by skipping edges that have already been visited.
• Reduced duplication between the MSL and GLSL implementations of nodes.
• Updated the UsdPreviewSurface shading model to v2.6, maintaining the visual interpretation of existing assets.
• Raised the minimum OSL version to v1.12.6 in OSL shader generation.

Fixed

• Fixed unintentional camera orbiting in the render view of the MaterialX Graph Editor.
• Fixed banding artifacts in the MaterialX Viewer on MacOS.
• Fixed the handling of missing scenes in the MaterialX Web Viewer.
• Fixed an edge case for node pasting in the MaterialX Graph Editor.
• Fixed the implementation of texture filtering in OSL shader generation.
• Fixed the implementation of the heighttonormal node in OSL shader generation.
• Fixed a call to the anisotropic_vdf closure in OSL shader generation.

Removed

• Removed support for the legacy OSL closures, focusing exclusively on the MaterialX-synchronized closures in OSL 1.12 and beyond.

Version 1.39.1

Added

• Added initial shader translation graphs between Standard Surface and OpenPBR Surface.
• Added initial support for code generation hints.

Changed

• Raised the minimum CMake version to CMake 3.24.
• Moved feature proposals from the main specification to a new MaterialX Proposals document.
• Updated the open definitions of the MaterialX Lama nodes to improve alignment with RenderMan.

Fixed

• Fixed errors in the installation steps for CMake builds.
• Fixed the computation of Fresnel transmission in GLSL.
• Fixed an implementation of the combine2 node in MDL.
• Fixed transposed matrices in color transforms for the displayp3 space.
• Fixed edge cases in the version upgrade process for swizzle nodes.
• Fixed a crash in the Graph Editor when renaming a node graph.
• Fixed the exporting of PugiXML symbols in MaterialXFormat.

Removed

• Removed an extra installation of the resources folder in MaterialXGenShader.

Version 1.39.0

Added

• Added support for the OpenPBR Surface shading model, including the MaterialX definition and example materials for OpenPBR Surface v1.1.
• Added support for Hoffman-Schlick Fresnel, Zeltner sheen, and energy-compensated Oren-Nayar diffuse, with initial implementations in hardware shading languages.
• Added support for the LamaGeneralizedSchlick and LamaIridescence nodes, with definitions provided as MaterialX graphs.
• Added support for integer-type add, subtract, and conditional nodes.
• Added support for matrix-type switch and conditional nodes.
• Added support for additional convert node input and output types.
• Added support for monolithic builds of MaterialX.
• Added support for the full set of shader generators in JavaScript.
• Added support for frame timing in the MaterialX Viewer.
• Added a uiScale option for adjusting DPI in the Graph Editor.
• Added an example script to generate a MaterialX document from a folder of textures.
• Added unit tests for core utilities and ESSL shader generation.
• Added support for Python 3.12 in Python wheel generation.
• Added GCC 14 and Clang 18 builds to GitHub Actions CI.

Changed

• Raised the minimum C++ version for MaterialX builds to C++17.
• Updated the PyBind11 library to version 2.12.0, enabling support for recent compilers and CMake versions.
• Improved the expression of thin-film layering in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Improved the generality of the normalmap node in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Extended the switch node to ten inputs in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Renamed the inputs of the atan2 node in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Changed the type of subsurface_bsdf radius from vector3 to color3 in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Renamed the normalmap nodedef in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Improved the support for double-sided materials in MaterialX 1.39.
• Optimized Fresnel computations in GLSL, improving the performance of physically based shading in real-time renders.
• Applied lossless optimization to PNG and JPG textures in the MaterialX repository.

Fixed

• Fixed default values for the creatematrix node.
• Fixed an issue with keyboard input focus in the Graph Editor.

Removed

• Removed the swizzle node in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Removed the channels attribute in MaterialX 1.39, with automatic upgrade logic for legacy documents.
• Removed the unimplemented arrayappend node in MaterialX 1.39.

Version 1.38.10

Added

• Added support for environment light intensity in generated GLSL shaders.

Changed

• Removed an extra suffix from element names in texture baking.

Fixed

• Moved environment prefilter functions to their referencing GLSL files, addressing shader compilation errors in USD.
• Enabled color and unit transforms on root nodes in shader generation, addressing missing color transforms in USD.
• Updated document caches to store elements in declaration order, addressing compiler-dependent behavior in nodedef lookups.
• Switched to framework linkage for OpenGL libraries on MacOS, addressing build issues in downstream projects.
• Switched to legacy OpenGL libraries for Python wheels on Linux, addressing missing OpenGL functionality in Python wheels.
• Added a missing vertex data prefix in Vulkan GLSL shader generation.

Version 1.38.9

Added

• Added an initial NPR (non-photorealistic rendering) data library to MaterialX, supporting the View Direction, Facing Ratio, and Gooch Shading nodes.
• Added new nodes to the standard data library, including Reflect, Refract, Safe Power, Create Matrix, and Round.
• Added support for the generation of pre-filtered environment maps in MaterialX GLSL and MSL.
• Added support for geometry drag & drop, frame capture, UI ranges and enumerated values in the MaterialX Web Viewer.
• Added floating popups for hovered pins in the MaterialX Graph Editor.
• Added UI ranges to the 'useSpecularWorkflow' and 'normal' inputs of the UsdPreviewSurface shading model.
• Added versioning rules for the MaterialX API and data libraries to the developer guide.
• Added initial C++ fuzz tests and coverage tests to GitHub Actions CI.
• Added GCC 13, Clang 15, and Python 3.12 builds to GitHub Actions CI.

Changed

• Enabled the new OSL closures 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.
• Switched to a more efficient representation of HDR images in the MaterialX Web Viewer.
• Improved the logic for connecting pins in the MaterialX Graph Editor.
• Improved the handling of filename inputs in OSL shader generation.
• Reduced the size of the MaterialX data libraries, improving the use of graph definitions and merging duplicate implementations.
• Raised the minimum CMake version to CMake 3.16.
• Updated the C++ unit test library to Catch 2.13.10.

Fixed

• Fixed the attenuation of coated emission in the Standard Surface shading model.
• Fixed the implementation of the overlay node in shader generation.
• Fixed an edge case for type pointer comparisons in shader generation.
• Fixed an edge case for transform nodes in GLSL and MSL shader generation.
• Fixed the implementation of mx_hsvtorgb in MDL shader generation.
• Fixed orphaned links when deleting nodes in the MaterialX Graph Editor.
• Fixed scroll wheel interactions across windows of the MaterialX Graph Editor.
• Fixed the generation of unused imgui.ini files in the MaterialX Graph Editor.
• Fixed a dependency on module import order in MaterialX Python.
• Fixed an off-by-one index check in Element::setChildIndex.
• Fixed a missing null check in Graph::propertyEditor.
• Fixed cases where absolute paths were stored in MaterialXConfig.cmake.

Version 1.38.8

Added

• Added a broad set of new pattern nodes to MaterialX, including Circle, Hexagon, Cloverleaf, Line, Grid, Crosshatch, Checkerboard, Random Color, Random Float, Triangle Wave, Integer Floor, Integer Ceiling, and Distance.
• Added support for MaterialX builds on iOS.
• Added support for drag-and-drop import of MaterialX files in the Web Viewer.
• Added generation of MaterialX Python wheels in GitHub Actions, enabling the distribution of MaterialX Python packages through PyPI.
• Added support for the lin_displayp3 and srgb_displayp3 colorspaces in shader generation.
• Added support for the blackbody PBR node in shader generation.
• Added support for displacement in MDL generation.
• Added blend and up-axis controls to the triplanar projection node.
• Added version details to shared libraries on Windows.
• Added a MacOS 13 build to GitHub Actions.

Changed

• Raised the minimum C++ version for MaterialX builds to C++14.
• Upgraded the PyBind11 library 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 in GLSL generation, leveraging insights from the HPG 2023 paper by Jonathan Dupuy and Anis Benyoub.
• Improved property panel display in the MaterialX Graph Editor.
• Improved node spacing in the MaterialX Graph Editor.
• Improved the robustness of MaterialX unit tests with respect to the current working directory.
• Simplified the handling of default colors in GLSL generation, removing dynamic branches on texture size.
• Simplified the definitions of the default color transforms, implementing them as language-independent MaterialX graphs.
• Simplified the interface of ShaderGenerator::emitFunctionCall, marking its original interface as deprecated.
• Marked legacy interfaces for findRenderableElements and findRenderableMaterialNodes as deprecated, making their usage visible to clients as compiler warnings.
• Moved the MaterialX specification to public Markdown files in GitHub, enabling direct contributions from the community.

Fixed

• Fixed brightness artifacts in the triplanar projection node.
• Aligned default values for conductor_bsdf with the MaterialX specification.
• Fixed volume mixing in MDL generation.
• Fixed a bug to improve shader generation determinism.
• Fixed a bug to improve the consistency of auto layout in the MaterialX Graph Editor.
• Fixed a bug to enable multi-output connection edits in the MaterialX Graph Editor.
• Fixed a bug in dot node optimizations for shader generation.

Version 1.38.7

Added

• Added the MaterialX Graph Editor, an example application for visualizing, creating, and editing MaterialX graphs.
• Added support for the Metal Shading Language in MaterialX shader generation and rendering.
• Added support for the generalized_schlick_edf node, enabling the expression of coated emissive surfaces.
• Added support for the adobergb and lin_adobergb color spaces in shader generation.
• Added uisoftmin and uisoftmax attributes to mix nodes and IOR inputs.
• Added support for authored bitangent vectors in GLSL, selected by the hwImplicitBitangents generator option.
• Added a tangent input to the glTF PBR shading model.
• Added a Clang Format step to GitHub Actions builds.
• Added support for Xcode 14.

Changed

• Included the standard data libraries in MaterialX Python packages.
• Improved the support library and node implementations for OSL generation.
• Updated MDL shader generation to support MDL 1.7.
• Improved the handling of functional graphs in MDL generation.
• Upgraded the NanoGUI version in the viewer to support Apple M1 builds.
• Upgraded the Catch library to version 2.13.9.

Fixed

• Fixed logic for tangent basis orthogonalization in generated GLSL.
• Fixed logic for metallic F90 and an opacity edge case in UsdPreviewSurface.
• Fixed parsing of inline source code variables in node implementations.

Version 1.38.6

Added

• Added new Unified Noise, Color Correct, and Bump nodes, providing artistic interfaces over the standard procedural, adjustment, and geometric primitives.
• Added shader generation support for the MaterialX closures in OSL, selected by a new CMake build option.
• Added a shader translation graph from Autodesk Standard Surface to glTF PBR.
• Added support for the transmission_extra_roughness input in the Standard Surface shading model.
• Added support for the iridescence inputs in the glTF PBR shading model.
• Added support for the subsurface_bsdf node in MDL.
• Added an operationorder input to the 'place2d' node.
• Extended the mix node to support multi-channel interpolators.
• Extended the flattenSubgraphs method to handle a broader range of graph structures.

Changed

• Improved the alignment of the UsdPreviewSurface shading graph with reference implementations.
• Improved the accuracy of the thin-film BSDF implementation in GLSL.
• Improved code generation for the mix node of 'surfaceshader' type.
• Removed add and multiply nodes for 'surfaceshader', 'volumeshader', and 'displacementshader' types.
• Refactored and extended the Advanced Options panel in MaterialXView.

Fixed

• Fixed the implementation of the screen compositing node in GLSL, OSL, and MDL.
• Fixed parent/child precedence in the getGeometryBindings function.
• Fixed OpenGL errors when unbinding geometry in MaterialXView on MacOS.

Version 1.38.5

Added

• Added a refraction approximation 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 example from the 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 within the MaterialX data libraries, enabling custom folder names in distributions.
• Improved and extended the sample Web Viewer.

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.