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RTXDI SDK Change Log

2.2.0

Release highlights:

  • Updated NRD to v4.4.2 and updated sample app code accordingly.
  • Updated Donut sample framework to support NRD update.
  • Removed Packman hosting of dependencies and the corresponding "update_dependencies" scripts.
  • DXC redistributable is now installed by CMake.
  • Assets are now installed from the new RTXDI Assets submodule.

Breaking changes:

Fixed issues:

  • Fixed visual "sparkling" regression in fused resampling kernel.
  • Fixed Linux build.

Misc improvements:

2.1.0

Release highlights:

  • Major refactor of C++ API that separates the ReSTIR DI, ReGIR, and ReSTIR GI algorithms into distinct contexts.
  • Shader functions and structs renamed to reflect partition of algorithms.
  • Added ImportanceSamplingContext class that collects all 3 algorithms into a central class to ensure shared state is properly managed.
  • UI redone for the rtxdi-sample project's ReSTIR DI, ReGIR, and ReSTIR GI sections.

Breaking changes:

  • C++ API changed completely. Algorithms are now organized by a single context each.
  • ReSTIR DI reservoir struct renamed from RTXDI_Reservoir to RTXDI_DIReservoir, with corresponding changes to DI reservoir functions.
  • ReSTIR DI resampling functions renamed to have a DI infix to distinguish them from their GI counterparts.
  • Shader headers broken down into more files.

Fixed issues:

  • Fixed SPIR-V compiler issues.
  • Reorganized UI to reflect algorithm/code path.

Misc improvements:

  • Decoupled boiling filter, bias correction, and several other settings for ReSTIR DI and ReSTIR GI.
  • Broke down ReSTIR DI local light sampling code into smaller functions for easier reuse and expansion.

2.0.0

Release highlights:

  • Added ReSTIR GI resampling functions and their integration in the sample application.
  • Added debug visualization for intermediate render targets.
  • Added the sdk-only branch to make using RTXDI as a submodule easier.

Breaking changes:

  • Added a required bridge function RAB_ClampSamplePositionIntoView.
  • Changed the PDF texture requirements to include a full mip chain up to 1x1 pixels.

Fixed issues:

  • Fixed bias that could be observed when using BRDF MIS rays.
  • Fixed the checkerboard rendering mode when the ReLAX denoiser is used.
  • Fixed a compile error when Vulkan is not enabled in CMake configuration.
  • Fixed the fused spatio-temporal direct light resampling path on DX12.

Misc improvements:

  • Updated RTXGI to v1.2.12 and switched to using an SDK-only branch of RTXDI.
  • Updated NRD to version 3.3.1.

1.3.0

Release highlights:

  • Added Pairwise Multiple Importance Sampling (MIS) normalization for ReSTIR that improves resampling quality on glossy surfaces.
  • Added MIS with BRDF rays. Light samples discovered from BRDF rays are mixed into ReSTIR, greatly improving image quality on low-roughness surfaces.
  • Updated NRD to version 3.0.

Breaking changes:

  • Some bridge functions have changed signatures.
  • Added required bridge functions for BRDF sampling.

Misc improvements:

  • Removed the old "ReSTIR Direct + BRDF MIS" rendering mode, replaced by the new MIS mode.

1.2.1

Breaking changes:

  • Added support for compiling the RTXDI shader headers in a GLSL environment. Some functions have changed their signatures to remove resource-type parameters, which are now passed through macros.

Fixed issues:

  • Fixed the remaining Slang compatibility issue in the RTXDI shader headers.

New features:

  • Added various command line options for automated functional and performance testing.
  • Added a minimal sample app to demonstrate a basic mesh lighting setup.

Misc improvements:

  • Updated NRD to version 2.10.

1.2.0

Release highlights:

  • Integrated RTXGI into the sample app. The RTXGI probes provide indirect lighting for primary or secondary surfaces, depending on the settings.
  • Integrated DLSS into the sample app.
  • Updated NRD to version 2.9.
  • Added support for rendering a denoiser confidence signal from ReSTIR, see Computing Denoiser Confidence Inputs using RTXDI.
  • Added sample permutations into the temporal resampling functions. These permutations greatly improve the temporal properties of the ReSTIR signal. See enablePermutationSampling.

New features:

  • Added support for low-resolution rendering and temporal upscaling through TAAU or DLSS.
  • Added resampling from the G-buffer on secondary surfaces to improve the secondary direct lighting sampling quality.
  • Added an option to mix some noise back into the denoiser output, which improves final image sharpness with DLSS.
  • Added custom visualization modes for many HDR signals like lighting luminance or reservoir weights.
  • Added support for zero-radius point lights.

API changes:

  • Added the temporalSamplePixelPos out parameter to the temporal and spatio-temporal resampling functions.
  • Added the optional selectedLightSample in-out parameter to all resampling functions.

Misc improvements:

  • Added a -debug command line option to enable the validation layers.
  • Changed the motion vector formulation to be compatible with NRD and DLSS in case of dynamic resolution.
  • Improved specular MIS with importance sampled environment maps.
  • Improved temporal resampling performance by skipping the visibility ray for most pixels with no quality loss. See enableVisibilityShortcut.
  • Improved the organization of the source code files into folders.
  • Improved the processing of profiler readbacks to remove a pipeline bubble and improve overall performance.
  • Made the RTXDI SDK shader headers compatible with the Slang compiler.
  • Moved the shading of secondary surfaces into a separate pass, which often improves performance.
  • Re-designed the sample application user interface.

Fixed issues:

  • Fixed the brightening bias that happened in disoccluded regions in the spatial resampling pass.
  • Fixed the handling of reservoirs for lights that have disappeared.
  • Fixed the data corruption in packed reservoirs that was caused by negative distance values.
  • Fixed some issues with glTF models that have multiple geometries in their meshes.
  • Fixed the packman file permissions on Linux.

1.1.0

API changes:

  • Added the RAB_GetTemporalConservativeVisibility bridge function.
  • Removed the usePreviousFrameScene parameter from the RAB_GetConservativeVisibility bridge function.

Major code changes:

  • Switched to use the open source version of the Donut framework and glTF models.
  • Updated NRD to version 2.5 that is now integrated as a git submodule and works on Linux (both x64 and ARM64 architectures).

New features:

  • Added bloom post-processing effect.
  • Added compatibility with the ARM64 processor architecture (when running Linux)
  • Added support for skeletal animation in the sample application.
  • Enabled the KHR_ray_tracing_pipeline API on Vulkan.
  • Enabled TLAS updates (instead of rebuilds) in the sample application.

Misc improvements:

  • Added dependency packages and scripts to make the sample application easy to build on Linux.
  • Fixed some issues with the material model and BRDF evaluation.
  • Improved the BRDF ray importance sampling logic.

1.0.0

Initial release.