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MDL SDK 2023.0.4 (367100.4957): 05 Oct 2023
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@mkroll-nv mkroll-nv released this 13 Oct 11:50
· 9 commits to master since this release
2023.0.4
0bcb415

ABI compatible with the MDL SDK 2023.0.4 (367100.4957) binary release
(see https://developer.nvidia.com/mdl-sdk)

Added and Changed Features

  • General

    • Python Bindings:
      • Added binding for the (built-in) entity resolver and added unit tests.
      • Accessing functions of invalid interfaces do not crash anymore but
        instead throw python exceptions.
      • Added more unit tests.
      • Extend the wrapper around MDL type (Type):
        • Give access to vectors and arrays size and element type.
        • Give access to matrices size.
      • Convert low level IValues to python friendly data types:
        • Extended to give access to file path for textures, light profiles
          and BSDF measurements.

  • MDL SDK examples

    • Example DXR:
      • Reduced the HLSL glue code and added dynamic function selection
        for generated shader functions.
      • Added support for backface scattering and emission.
      • Handle meters_per_scene_unit at runtime and expose the parameter to the UI.
      • MaterialX resource resolution now uses the MDL entity resolver as fallback
        to handle tiled resources.
      • Handle the collapse flag of the in_group annotations.
      • Improved measured BSDF runtime implementation numerically.
      • Camera pose fitting now sets near and far plane distances.
      • Added support for KHR_materials_iridescence glTF extension.
    • Example Traversal:
      • Removed the preprocessor directive that disabled the distiller option.

Fixed Bugs

  • General

    • Catch memory allocation failures in the OpenImageIO plugin while exporting images.
    • Python Bindings: Fixed the mdl_distiller plugin path in the scripts for
      running the examples.
    • Argument expressions that are created by the API are no longer optimized by the MDL
      compiler, but stay "unmodified" until arguments in class compilation mode are created.
      This makes the generated arguments more "deterministic" for users.
    • Fixed export of uv-tile textures. Only first tile was exported.
    • Fixed export of animated textures when frame number differs from frame ID.

  • MDL Compiler and Backends

    • Fixed translation of vector access with non-constant index in some cases for HLSL/GLSL.
    • Fixed bit-operations on integer fields in structs containing derivable values.
    • HLSL/GLSL: The compiler uses now name mangling on struct types instead of
      the very simple old connection with '_'.
    • Fixed bug that caused crashes when several MDL modules import each other
      within a special order.
    • Material expressions which path prefix is "geometry.displacement" are now created in
      the displacement context.
    • Fixed code generation for re-exported MDL entities.
    • Fixed parsing of resource sets inside container files (MDLE).
    • Fixed ownership of types in created distribution functions which could lead to crashes
      under certain complex conditions.
    • Fixed crashes due to "missing functions" which are requested from wrong modules,
      for instance state::cos().
    • Fixed printing of package name components which are MDL keywords and require
      quoting as Unicode identifiers.

  • MDL SDK examples

    • Example DXR:
      • Fixed the UI parameter mapping for struct parameters.
      • Reviewed the UV coordinate handling and improved its documentation.
      • Added missing out of bounds check when reading NV_materials_mdl nodes.
      • Treat alpha channels in glTF textures as linear in cases where the RGB data
        is in sRGB color space.
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