MDL SDK 2023.1.2 (373000.1755): 23 Jan 2024

ABI compatible with the MDL SDK 2023.1.2 (373000.1755) binary release
(see https://developer.nvidia.com/mdl-sdk)

Added and Changed Features

• General

  • libbsdf:
    • The roughness values computed by the generated auxiliary functions changed to contain
      only glossy contributions.
    • The color weights for normals and roughness in the generated auxiliary functions
      are now reduced by luminance instead of average.

• MDL Compiler and Backends

  • Allow more direct assignments of vectors instead of element-wise assignments for HLSL.
  • Avoid unnecessary calls to functions whose values are not actually used.
  • Avoid reading whole arrays from argument blocks or read-only data segments when
    providing those arrays as function parameters. This especially improves rendering
    performance of axf_importer materials.
  • Avoid array copies when accessing arrays provided as function parameters for HLSL/GLSL.

• MDL SDK examples

  • Add options to configure the lambda return mode and the generation of PDF and auxiliary
    functions to code_gen example.
  • Rename "-p" parameter of df_cuda example to "--cam" and use "-p" as short form
    for "--mdl_path" as in other examples.

Fixed Bugs

• General

  • nvidia::core_definitions: Fixed '--' in display names.
  • Fixed type computation of ternary operator in MDL SDK/neuray.

• MDL Compiler and Backends

  • Fixed a rare crash that could happen in an MDL module imports other modules and
    import the same module (diamond pattern).
  • Fixed default constructor of enum values which sometimes did not choose
    the first enumerator as default value.