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.

Version 1.38.4

Added

• Added JavaScript bindings for MaterialXCore, MaterialXFormat, and MaterialXGenGlsl.
• Added a sample Web Viewer, built and deployed through GitHub Actions.
• Added a MaterialX graph for the glTF PBR 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.
• 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 for coding details.

Version 1.38.3

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.

Version 1.38.2

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.

Version 1.38.1

Added

• Added support for shared library builds on Windows.
• Added support for 16-bit unsigned integer images in MaterialXRender.
• Added support for compound nodegraphs with user interfaces in shader and UI generation.
• Added headers for newly proposed MaterialX closures in OSL.
• Added a shader translation command to the viewer, assigned to the 'T' hotkey.

Changed

• Improved the memory efficiency of texture baking operations.
• Improved the compatibility of generated MDL code with Omniverse.
• Refactored image resolution logic into new methods ImageHandler::getReferencedImages and MaterialX::getMaxDimensions.
• Moved the viewer hotkey for GLSL code generation from 'S' to 'G' for consistency with other languages.

Fixed

• Fixed the Color3.asTuple and Color4.asTuple methods in Python

Version 1.38.0

Updated the MaterialX library to the v1.38 specification. See the v1.38 changelist for full details.

Added

• Added support for the generalized 'layer' node in Physically Based Shading.
• Added user controls for texture baking and wedge rendering in the MaterialX Viewer.
• Added support for Nvidia's Material Definition Language (MDL) in MaterialX code generation.
• Added support for inline source code in Implementation elements.
• Added support for TargetDef elements.
• Added viewer rendering to cloud-based tests in GitHub Actions.
• Added support for Xcode 12.

Changed

• Updated the set of standard nodes to match the v1.38 specification, including significant improvements to the Physically Based Shading nodes.
• Replaced specialized Material elements with material nodes, allowing more flexible material definitions and more consistent traversal.
• Unified the Input and Parameter element classes, simplifying the MaterialX API and client code.
• Updated the MaterialX viewer to use native classes for GLSL rendering and camera controls, opening the door to additional render frameworks in the future.
• Updated the prefiltered path for specular environment rendering in GLSL, providing a closer match with the Filtered Importance Sampling path.
• Updated the definition of Autodesk Standard Surface to version 1.0.1.
• Updated the definition of UsdPreviewSurface to version 2.3.
• Renamed the default branch from master to main.

Removed

• Removed support for the 'complex_ior', 'backfacing', 'viewdirection' and 'fresnel' nodes in Physically Based Shading.
• Removed support for the Color2 type.

Version 1.37.4

Added

• Added software rendering tests for MaterialXRenderGlsl to GitHub Actions.

Changed

• Improved the robustness of context management in MaterialXRenderGlsl.

Fixed

• Added a missing VAO binding to GlslRenderer::drawScreenSpaceQuad.

Version 1.37.3

Added

• Added Render Transparency and Render Double-Sided options to the Advanced Settings panel of the viewer.
• Added viewer support for partially-transparent mesh partitions.
• Added a subsurface scattering approximation to MaterialX GLSL.
• Added a CMake option for building shared libraries on Linux and MacOS.
• Added support for the latest OpenImageIO interface.

Changed

• Improved the robustness of texture baking and shader translation.
• Unified the handling of missing images in generated GLSL.
• Moved CI builds from Travis and Appveyor to GitHub Actions.

Fixed

• Fixed a bug in code generation for custom BSDF/EDF graphs.
• Fixed rendering of single-channel textures in MaterialXRenderGlsl.

Version 1.37.2

Added

• Added support for texture baking from Python, including new example script baketextures.py.
• Added support for texture baking of materials with multiple UDIMs.
• Added support for floating-point render targets in ShaderRenderer and its subclasses, allowing for HDR texture baking.
• Added support for displacement shaders in generated OSL.
• Added the ShaderTranslator class, laying the groundwork for support of shader translation graphs.
• Added Python bindings for the Image class.

Fixed

• Fixed the alignment of environment backgrounds in the viewer.

Removed

• Removed the CopyOptions class, making it the default behavior of Document::importLibrary to skip conflicting elements.

Version 1.37.1

Added

• Added command-line options for mesh, light, and camera transforms to the viewer.
• Added command-line options for screen dimensions and background color to the viewer.
• Added a Light Rotation slider to the Advanced Settings panel of the viewer.
• Added utility methods Backdrop::setContainsElements and Backdrop::getContainsElements.
• Added backwards compatibility for OpenImageIO 1.x.
• Added support for GCC 10.

Changed

• Improved energy conservation and preservation computations in generated GLSL.
• Upgraded Smith masking-shadowing to height-correlated form in generated GLSL.
• Improved the robustness of tangent frame computations in MaterialXRender.
• Renamed Backdrop::setContains and getContains to Backdrop::setContainsString and getContainsString for consistency.

Fixed

• Fixed the GLSL implementation of Burley diffuse for punctual lights.
• Fixed the upgrade path for compare nodes in v1.36 documents.