HIGHLIGHTS

• Significant baseline performance (~30%) improvements
• Added DLSS Super Resolution, DLSS Frame Generation and Reflex
• Various bug fixes, Vulkan improvements and SDK updates

DETAILS

Optimizations

• Path tracer performance pass: better RR, removing redundant BSDF math, removing SER from non-random (stable) path decomposition pre-pass, etc.
• Texture MIP computation is now precomputed
• RTXDI now uses compressed GBuffer to significantly reduce memory bandwidth required as well as the size
• RTXDI now uses fused ReSTIR DI and ReSTIR GI apply pass to reduce unnecessary loading & processing
• Using tiled-swizzled packing for GBuffer and stable planes for more cache-friendly access patterns
• various other shader optimizations

Bug fixes

• fix for autoexposure bug causing overdarkening at certain resolutions
• fix for RTXDI bug causing blocky artifacts from low probability samples in disoccluded areas (i.e. when quickly turning camera)
• fix for RTXDI bug causing incorrect light resampling resulting in overly sharp shadows
• various Vulkan-related fixes
• various denoising (NRD) fixes
• various path decomposition fixes
• fix for random number generator seed being same on vertex 0 and 1 in some cases
• OMM fix for crash/hang when loading Sponza (https://github.com/NVIDIAGameWorks/Path-Tracing-SDK/issues/6)

Features and changes

• Streamline 2.1.0 integration (DLSS SR, DLSS FG, Reflex)
• Upgrade to NRD 4.2.1 (see https://github.com/NVIDIAGameWorks/RayTracingDenoiser)
• Various other RTXDI fixes & optimizations including upgrade to latest RTXDI sdk-only branch (https://github.com/NVIDIAGameWorks/RTXDI/commits/sdk-only)
• Path decomposition debug view (requires setting ENABLE_DEBUG_DELTA_TREE_VIZUALISATION to 1)
• Update to latest DXC compiler (https://github.com/microsoft/DirectXShaderCompiler/releases/tag/v1.7.2212.1)
• General code cleanup, dropping unused codepaths and etc.