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Change Log

[1.39.0] - Development

Added

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.
  • 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.
  • Renamed the normalmap nodedef in MaterialX 1.39, with automatic upgrade logic for legacy documents.
  • 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.

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.

Fixed

[1.38.10] - 2024-04-12

Added

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.

[1.38.9] - 2024-02-26

Added

Changed

Fixed

[1.38.8] - 2023-09-08

Added

Changed

Fixed

[1.38.7] - 2023-04-21

Added

Changed

Fixed

[1.38.6] - 2022-11-04

Added

Changed

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.

[1.38.5] - 2022-07-09

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

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.

[1.38.4] - 2022-04-06

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.

[1.38.3] - 2021-12-14

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.

[1.38.2] - 2021-10-07

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.

[1.38.1] - 2021-06-18

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

[1.38.0] - 2021-03-02

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.

[1.37.4] - 2020-12-18

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.

[1.37.3] - 2020-11-24

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.

[1.37.2] - 2020-09-06

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.

[1.37.1] - 2020-06-04

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.

[1.37.0] - 2020-03-20

Updated the MaterialX library to the v1.37 specification. See the v1.37 changelist for full details.

Added

  • Added a Shadow Map option to the viewer, supported by shadowing functionality in GLSL code generation.
  • Added support for the 'uisoftmin', 'uisoftmax', and 'uistep' attributes, updating Autodesk Standard Surface to leverage these features.
  • Added support for LookGroup elements.
  • Added support for Clang 9.

Changed

  • Updated the set of standard nodes to match the v1.37 specification.
  • Unified the rules for NodeDef outputs, with all NodeDefs defining their output set through Output child elements rather than 'type' attributes.
  • Replaced GeomAttr elements with GeomProp elements.
  • Replaced backdrop nodes with Backdrop elements.
  • Aligned Matrix33 and Matrix44 with the row-vector convention, for improved consistency with Imath, USD, and other libraries.
  • Updated the stb_image library to version 2.23.

[1.36.5] - 2020-01-11

Added

  • Added a Load Environment option to the viewer, allowing arbitrary latitude-longitude HDR environments to be loaded at run-time.
  • Added an initial TextureBaker class, supporting baking of procedural content to textures.
  • Added initial support for units, including the MaterialX::Unit, MaterialX::UnitDef, and MaterialX::UnitTypeDef classes.
  • Added support for unit conversion in shader code generation.
  • Added support for Visual Studio 2019.

Changed

  • Updated Autodesk Standard Surface to the latest interface and graph.
  • Updated the PyBind11 library to version 2.4.3.

[1.36.4] - 2019-09-26

Added

  • Added a Save Material option to the viewer.
  • Added property accessors to PropertyAssign and PropertySetAssign
  • Added Python bindings for TypeDesc and array-type Values.
  • Added Python functions getTypeString, getValueString, and createValueFromStrings.
  • Added support for GCC 9 and Clang 8.

Changed

  • Updated the interface of readFromXmlFile and writeToXmlFile to support FilePath and FileSearchPath arguments.
  • Extended Python bindings for FilePath and FileSearchPath.

Removed

  • Deprecated Python functions typeToName, valueToString, and stringToValue.
  • Removed deprecated Python functions objectToString and stringToObject.

Fixed

  • Fixed the OSL implementation of roughness_dual.

[1.36.3] - 2019-08-02

Merged shader code generation and physically-based shading nodes from Autodesk's ShaderX extensions. Added a default MaterialX viewer based on GLSL shader generation.

Added

  • Added the MaterialXGenShader library, supporting shader code generation in GLSL and OSL.
  • Added the MaterialXRender library, providing helper functionality for rendering MaterialX content.
  • Added the MaterialXView library, providing a default MaterialX viewer.
  • Added the physically-based shading node library (libraries/pbrlib).
  • Added a root-level 'cmake' folder, including a standard FindMaterialX module.
  • Added a root-level 'resources' folder, including example materials and meshes.
  • Added documents for the 1.37 specification.

Changed

  • Moved the MaterialX data libraries from 'documents/Libraries' to 'libraries'.
  • Updated MaterialX node definitions to the 1.37 specification.
  • Updated the PyBind11 library to version 2.2.4.

Removed

  • Removed customizations of PyBind11 to support Python 2.6. Only Python versions 2.7 and 3.x are now supported.

[1.36.2] - 2019-03-05

Added

  • Added support for 'nodedef' attributes on MaterialX::Node, integrating this usage into GraphElement::addNodeInstance.
  • Added the MaterialX::GeomPropDef class for geometric input declarations.
  • Added the Document::getGeomAttrValue method.
  • Added the ValueElement::getResolvedValue method.
  • Added support for the MATERIALX_SEARCH_PATH environment variable.
  • Added support for GCC 8 and Clang 7.

Changed

  • Added callbacks Observer::onCopyContent and Observer::onClearContent, and removed callback Observer::onInitialize.
  • Moved the standard document library to the 'documents/Libraries/stdlib' folder.

[1.36.1] - 2018-12-18

Added

  • Added support for interface tokens, including the MaterialX::BindToken class and '[TOKEN]' syntax in filenames.
  • Added support for Clang 6.

Changed

  • Updated geometry token syntax from '%TOKEN' to '<TOKEN>'.
  • Replaced readXIncludes boolean with a readXIncludeFunction callback in the XmlReadOptions structure.
  • Combined individual options into an XmlWriteOptions argument for the XML write functions.
  • Extended functionality of the vector and matrix classes.
  • Updated the PyBind11 library to version 2.2.3.
  • Updated the PugiXML library to version 1.9.

Fixed

  • Fixed graph implementations of range, extract, tiledimage, and ramp4 nodes.

[1.36.0] - 2018-07-23

Updated the MaterialX library to the v1.36 specification. See the v1.36 changelist for full details.

Added

  • Added support for Element namespaces.
  • Added support for NodeDef inheritance.
  • Added support for root-level node elements.
  • Added support for inheritance attributes on MaterialX::Material and MaterialX::Look.
  • Added support for include and exclude attributes on MaterialX::Collection.
  • Added the MaterialX::Token class for string substitutions.
  • Added the MaterialX::Variant, MaterialX::VariantSet, and MaterialX::VariantAssign classes.
  • Added the MaterialX::GeomPath class for geometry name comparisons.
  • Added the Collection::matchesGeomString method, for testing matches between collections and geometries.
  • Added the Material::getGeometryBindings method, for finding the bindings of a material to specific geometries.

Removed

  • Removed the MaterialX::MaterialInherit and MaterialX::LookInherit classes.
  • Removed the MaterialX::CollectionAdd and MaterialX::CollectionRemove classes.
  • Removed the MaterialX::Override class and support for public names.
  • Removed the 'channels' attribute from MaterialX::InterfaceElement.
  • Removed the Material::getReferencingMaterialAssigns method (deprecated in Python).

[1.35.5] - 2018-05-07

Added

  • Added material inheritance support to graph traversal and the high-level Material API.
  • Added Material methods getActiveShaderRefs and getActiveOverrides.
  • Added PropertySet methods setPropertyValue and getPropertyValue.
  • Added Element methods setInheritsFrom, getInheritsFrom, traverseInheritance, hasInheritanceCycle, and getDescendant.
  • Added function templates MaterialX::fromValueString and MaterialX::toValueString.
  • Added math functionality to the vector and matrix classes.
  • Added support for Visual Studio 2017, GCC 7, and Clang 5.

Changed

  • Renamed Matrix3x3 to Matrix33 and Matrix4x4 to Matrix44.
  • Renamed VectorN::length to VectorN::numElements.
  • Updated the PyBind11 library to version 2.2.1.

[1.35.4] - 2017-12-18

Added

  • Added high-level Material API, including getPrimaryShaderParameters, getPrimaryShaderInputs, getBoundGeomStrings, and getBoundGeomCollections.
  • Added methods ValueElement::getBoundValue and ValueElement::getDefaultValue.
  • Added support for multi-output nodes.
  • Added support for TypeDef members.
  • Added StringResolver class, for applying substring modifiers to data values.
  • Added example interfaces for the Disney BRDF, Disney BSDF, and alSurface shaders.

Changed

  • Renamed method Material::getReferencedShaderDefs to Material::getShaderNodeDefs.
  • Renamed method ShaderRef::getReferencedShaderDef to ShaderRef::getNodeDef.
  • Renamed method Node::getReferencedNodeDef to Node::getNodeDef.
  • Added a 'string' suffix to all accessors for 'node', 'nodedef', and 'collection' strings.
  • Combined individual booleans into an XmlReadOptions argument for the XML read functions.

Removed

  • Removed method Document::applyStringSubstitutions (deprecated in Python).
  • Removed method InterfaceElement::getParameterValueString (deprecated in Python).

[1.35.3] - 2017-10-11

Added

  • Added support for Python 3.
  • Added support for standard TypeDef attributes.
  • Added support for values of type 'stringarray'.
  • Added method Element::setName.
  • Extended Python bindings for Document, NodeGraph, MaterialAssign, and Collection.

Changed

  • Modified NodeGraph::topologicalSort to return elements in a more intuitive top-down order, with upstream elements preceding downstream elements.
  • Removed special cases for string return values in MaterialX Python, with all strings now returned as 'unicode' in Python 2 and 'str' in Python 3.
  • Updated OSL reference implementations.

Fixed

  • Fixed handling of empty names in Element::addChildOfCategory.
  • Fixed an edge case in Document::upgradeVersion.

[1.35.2] - 2017-07-03

Added

  • Added OSL source files for the standard nodes.
  • Added example document 'PostShaderComposite.mtlx'.
  • Added method MaterialX::prependXInclude.

Changed

  • Argument 'writeXIncludes' defaults to true in MaterialX::writeToXmlStream and MaterialX::writeToXmlString.

Fixed

  • Fixed handling of BindInput elements with missing connections.

[1.35.1] - 2017-06-23

Added

  • Added a 'viewercollection' attribute to MaterialX::Visibility.
  • Added Python support for visibility and source URI methods.

Changed

  • Changed naming convention from 'ColorSpace' to 'ColorManagement' in Document methods.
  • Split library document 'mx_stdlib.mtlx' into 'mx_stdlib_defs.mtlx' and 'mx_stdlib_osl_impl.mtlx'.

[1.35.0] - 2017-06-20

Updated the MaterialX library to the v1.35 specification. See the v1.35 changelist for full details.

Added

  • Added the MaterialX::Visibility class.
  • Added 'file', 'function', and 'language' attributes to MaterialX::Implementation.
  • Added 'node' and 'nodedef' attributes to MaterialX::ShaderRef. In v1.35, these attributes define which NodeDef is referenced by a ShaderRef.
  • Added a 'material' attribute to MaterialX::MaterialAssign. In v1.35, this attribute defines which Material is referenced by a MaterialAssign.

Changed

  • Removed the MaterialX::LightAssign and MaterialX::Light classes. In v1.35, this functionality is now handled by the MaterialX::Visibility class.
  • Removed the 'default' attribute from MaterialX::ValueElement. In v1.35, this functionality is now handled by the 'value' attribute.
  • Replaced the 'matrix' type with 'matrix33' and 'matrix44', and replaced the MaterialX::Matrix16 class with MaterialX::Matrix3x3 and MaterialX::Matrix4x4.
  • Renamed Material::getMaterialAssigns to Material::getReferencingMaterialAssigns.
  • Changed the argument type for MaterialAssign::setExclusive and MaterialAssign::getExclusive to boolean.

[1.34.4] - 2017-06-09

Added

  • Added support for graph-based implementations of nodes.
  • Added support for subtree/subgraph pruning in traversals.
  • Added NodeGraph::topologicalSort and MaterialX::printGraphDot methods.
  • Added a File module to MaterialXFormat and MaterialXTest.

Changed

  • Extended NodeGraph::flattenSubgraphs to support subgraph recursion.
  • Added a searchPath argument to MaterialX::readFromXmlFile.

Fixed

  • Fixed an issue where connecting elements were not returned in graph traversal edges.

[1.34.3] - 2017-05-16

Added

  • Added support for document validation, including the Document::validate and Element::validate methods.
  • Added helper methods ValueElement::getResolvedValueString and Element::getNamePath.
  • Added standard library document.