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MDL SDK 2019.2 (325000.1814): 18 Dec 2019
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@lkettnerNV lkettnerNV released this 20 Dec 09:37
· 36 commits to master since this release
2019.2
59c5c02

ABI compatible with the MDL SDK 2019.2 (325000.1814) binary release
(see https://developer.nvidia.com/mdl-sdk)

Added and Changed Features

  • MDL 1.6 Language Specification

    • The file path resolution algorithm has been changed to treat weak relative
      paths the same as strict relative paths if the referring MDL
      module has an MDL version of 1.6 or higher. Furthermore,
      the error checks have been simplified to only protect relative paths from
      referring to files in other search paths.
    • The import of standard library modules has been changed in all examples
      to use absolute path imports.
    • An additional way of defining functions has been added using an expression
      instead of a procedural function body.
    • Let-expression can also be applied to functions defined using an expression.
    • The limitation has been removed that package names and module names can
      only be identifiers.
    • The new using alias declaration has been added to enable the use of Unicode
      names for module names and package names.
    • The description has been clarified that standard module names shadow only
      modules of the same fully qualified name while modules in subpackages can have
      a standard module name as their unqualified name.
    • The new scene standard library module has been added with
      data_isvalid, data_lookup_ltype, and
      data_lookup_uniform_ltype functions.
    • The new multiscatter_tint parameter has been added to all glossy BSDF
      models to enable energy loss compensation at higher roughness values.
    • The new df::sheen_bsdf bidirectional scattering distribution function has
      been added.
    • The new df::tint modifier overload has been added for the hair bidirectional
      scattering distribution function.
    • The new df::tint modifier overload has been added for the separate tinting
      of the reflective and transmissive light paths of a base BSDF.

  • General

    • The new API functions
      • mi::neuraylib::IModule::reload()
      • mi::neuraylib::IModule::reload_from_string()
      • mi::neuraylib::IModule::is_valid()
      • mi::neuraylib::IMaterial_definition::is_valid()
      • mi::neuraylib::IFunction_definition::is_valid()
      • mi::neuraylib::IMaterial_instance::is_valid()
      • mi::neuraylib::IMaterial_instance::repair()
      • mi::neuraylib::IFunction_call::is_valid()
      • mi::neuraylib::IFunction_call::repair()
      • mi::neuraylib::ICompiled_material::is_valid()
        have been added to support reloading of MDL modules.
    • The requirements on MDL module names have been relaxed according to the MDL 1.6
      Specification to allow loading of modules with Unicode names.
    • The new API functions
      • mi::neuraylib::ITarget_code::get_callable_function_df_handle_count() and
      • mi::neuraylib::ITarget_code::get_callable_function_df_handle()
        have been added.
    • The new API function mi::neuraylib::ITarget_code::get_texture_df_data()
      has been added.
    • mi::neuraylib::IMdl_compiler::load_module() can now be called from multiple
      threads to allow loading modules in parallel. To support custom thread blocking
      the new interfaces
      • mi::neuraylib::IMdl_loading_wait_handle and
      • mi::neuraylib::IMdl_loading_wait_handle_factory
        have been added.
    • The new API functions
      • mi::neuraylib::IMaterial_definition::get_body()
      • mi::neuraylib::IMaterial_definition::get_temporary_count()
      • mi::neuraylib::IMaterial_definition::get_temporary()
      • mi::neuraylib::IFunction_definition::get_body()
      • mi::neuraylib::IFunction_definition::get_temporary_count()
      • mi::neuraylib::IFunction_definition::get_temporary()
        have been added.
    • The signature of the function mi::base::ILogger::message() has been changed.
    • The API function mi::neuraylib::ITransaction::edit() has been adapted to disallow
      editing of database elements of type mi::neuraylib::IMaterial_definition and
      mi::neuraylib::IFunction_definition.
    • Support for multiple occurrence of the same annotation has been added to
      mi::neuraylib::Annotation_wrapper.
    • Support for deprecated features guarded by MI_NEURAYLIB_DEPRECATED_8_1 and
      MI_NEURAYLIB_DEPRECATED_9_1 has been removed.

  • MDL Compiler and Backends

    • Support for MDL 1.6 has been added to the MDL core compiler.
    • Limited support for MDL 1.6 features has been added to the backends, in
      particular, the scene module is supported, but currently no code is generated
      for interrogating the renderer, hence always the default value is returned.
    • Support for MDL 1.6 has been added to the generated code for distribution
      functions, that is df::tint(reflection_tint, transmission_tint),
      df::sheen_bsdf(), the multiscatter_tint parameter of all BSDFs exposing this
      in MDL 1.6 (note that this requires that all four dimensions of
      Bsdf_sample_data::xi are set).
    • For evaluating parts of distribution functions that are named by handles,
      Bsdf_evaluate_data and Bsdf_auxiliary_data are adapted to select individual
      handles.
    • A new backend option df_handle_slot_mode to select how evaluate and auxiliary
      data is passed between the generated code and the render has been added.
    • The bsdf field of Bsdf_evaluate_data is split into bsdf_diffuse and
      bsdf_glossy.
    • The Bsdf_sample_data structure now requires a 4th uniform random number and
      returns the handle of the sampled distribution part.
    • Inlining of functions containing constant declarations into the DAG has been
      implemented.
    • Support for light-path-expressions in generated code for distribution functions
      via handles has been added.
    • Support for retrieving albedo and normal in generated code for distribution
      functions via generated auxiliary functions has been added.
    • The entity resolver has been sped up for built-in modules in some cases where it
      is clear that the module can only be read from the MDL root.
    • The memory size of the DAG representation has been slightly reduced by
      internalizing all DAG signatures.
    • The DAG representation now uses unsafe math operations, especially x * 0 = 0
      for floating point values.

  • MDL SDK examples

    • Example df_cuda has been adapted to illustrate how to evaluate parts of the
      distribution functions named by handles via light path expressions (LPEs).
    • All examples have been adapted to support processing of Unicode command line
      arguments.

Fixed Bugs

  • General

    • An issue in the light profile parser has been fixed: For IESNA LM-63-2002 files
      the ballast-lamp value incorrectly acted as multiplier for the intensity.

  • MDL Compiler and Backends

    • Several issues in the generated code for distribution functions have been fixed:
      • Bugs in the computation of the pdf and eval functions of
        df::ward_geisler_moroder_bsdf have been fixed.
      • Incorrect pdf computation (for sample, eval, and pdf functions) in
        df::ward_geisler_moroder_bsdf and df::backscattering_glossy_reflection_bsdf
        have been fixed.
      • Fixed a missing re-scale of pseudorandom numbers for v-cavities based masking,
        leading to biased results for df::scatter_reflect_transmit.
      • Only use refraction-based half vector for Fresnel-layering, not for all curve
        layering operations.
      • Add simple inside/outside material support based on IOR comparison to determine
        which IOR to override in Fresnel layering. This fixes incorrect rendering when
        BSDFs of type df::scatter_reflect and df::scatter_transmit are layered using
        df::fresnel_layer, in particular missing total internal reflection.
    • The implementation of math::isnan() and math::isfinite() has been fixed for
      vector types.
    • Printing of quiet NaNs for HLSL has been fixed.
    • A crash in the MDL core compiler that could occur if exported types contain errors
      in their default initializers has been fixed.
    • Wrong function names generated from debug::assert() calls when placed after a
      while loop have been fixed.
    • The name of the anno::deprecated() parameter has been fixed, it is description,
      not message.
    • The export of MDL modules containing relative imports has been fixed, access to
      the imported entities is now generated correctly.
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