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Change Log

MDL SDK 2018.1.1 (307800.2890): 15 Sep 2018

ABI compatible with the MDL SDK 2018.1.1 (307800.2890) binary release (see https://developer.nvidia.com/mdl-sdk)

Added and Changed Features

  • General

    • A new API function mi::neuraylib::ILink_unit::add_material has been added to translate multiple distribution functions and expressions of a material at once.
    • A new API function mi::neuraylib::IMdl_backend::translate_material has been added to translate multiple distribution functions and expressions of a material at once.
    • A new function mi::neuraylib::ICompiled_material::get_connected_function_db_name has been added.
    • A new function IImage_api::create_mipmaps has been added.
    • A new parameter has been added to the functions mi::neuraylib::ITarget_code::execute* to allow passing in user-defined texture access functions.

  • MDL Compiler and Backends

    • Diffuse EDFs can now be translated to PTX, native x86 and LLVM IR.
    • Support for passing custom texture access functions has been added to the Native backend. The built-in texture handler can be disabled via the new backend option "use_builtin_resource_handler".

  • MDL SDK examples

    • The example_df_cuda example now features simple path tracing inside the sphere to enable rendering of transmitting BSDFs.
    • To allow loading of multiple materials within a module, a wildcard suffix "*" is now supported in the material name command line parameter of the example_df_cuda example.
    • The example_df_cuda has been updated to illustrate the use of the new function mi::neuraylib::ILink_unit::add_material.
    • The example_execution_native has been extended to illustrate the use of user-defined texture access functions.
    • The example_mdl_browser can now be built on Mac OS.

Fixed Bugs

  • General

    • The handling of archives containing a single module has been fixed in the mi::neuraylib::IMdl_discovery_api.
    • The handling of relative search paths has been fixed in the mi::neuraylib::IMdl_discovery_api.

  • MDL Compiler and Backends

    • Various fixes have been applied to the code generated for BSDF's:
      • The computation of the evaluate() function for glossy refraction has been fixed (df::simple_glossy_bsdf, df::microfacet*).
      • The sample() functions for layering and mixing now properly compute the full PDF including the non-selected components.
      • The implementation of df::color_clamped_mix() has been fixed (the PDF was incorrect and BSDFs potentially got skipped).
      • All mixers now properly clamp weights to 0..1.
      • Total internal reflection is now discarded for glossy BSDF (df::simple_glossy_bsdf, df::microfacet*) with mode df::scatter_transmit, as defined in the MDL specification.
    • Incorrect code generation for math::normalize() with the atomic types float and double has been fixed.
    • The generation of function names for array index functions for modules in packages has been fixed.
    • In rare cases, compilation of a df* function could result in undeclared parameter names (missing _param_X error), which has been fixed.
    • The compilation of MDL presets of re-exported materials has been fixed.
    • In rare cases, the original name of a preset was not computed, which has been fixed.

MDL SDK 2018.1 (307800.1800): 09 Aug 2018

  • Initial open source release
  • ABI compatible with the MDL SDK 2018.1 (307800.1800) binary release (see https://developer.nvidia.com/mdl-sdk)
  • The following features are only available in the binary release and excluded in the source code release:
    • MDL distiller
    • Texture baking (see examples/mdl_sdk/execution_cuda for example code for texture baking)
    • GLSL compiler back end
  • Added: MDL Core API, a lower-level compiler API in the MDL SDK (see src/prod/lib/mdl_core and doc/mdl_coreapi)
  • Added: examples for the MDL Core API (see examples/mdl_core and doc/mdl_coreapi)