v3.8.0:

HIGHLIGHTS:
- NRD: introduced optional "NRDEncoding.hlsli"
- NRD: introduced optional per per-pixel disocclusion threshold
- NRD: increased default disocclusion threshold
- NRD: fixed bug leading to rounding materialID 2 to 3
- RELAX / REBLUR: various improvements
- REBLUR: removed settings "minConvergedStateBaseRadiusScale" and "maxAdaptiveRadiusScale"
- REBLUR: specular tracking improvements

DETAILS:
- NRD: introduced optional "NRDEncoding.hlsli"
- NRD: introduced optional per per-pixel disocclusion threshold
- NRD: increased default disocclusion threshold
- NRD: fixed bug leading to rounding materialID 2 to 3
- RELAX / REBLUR: fixed potential SMEM out of bounds access
- RELAX / REBLUR: added support for IN_DISOCCLUSION_THRESHOLD_MIX
- RELAX / REBLUR: improved disocclusion check
- RELAX / REBLUR: improved "back faced" history rejection
- RELAX / REBLUR: fixed previous normal fetching math for footprints touching "background" pixels
- RELAX / REBLUR: refactoring
- RELAX: improved math handling jitter
- RELAX: added view vector- and roughness- based stoppers to A-trous
- RELAX: removed ortho related hack from TA pass
- RELAX: added materialID support to anti-firefly filter
- REBLUR: reduced potential specular smearing
- REBLUR: improved SMB (surface motion based) accumulation speed estimation
- REBLUR: tweaked anti-firefly suppressor settings
- REBLUR: tweaked roughness weight for specular VMB (virtual motion based) tracking
- REBLUR: fixed parallax-based specular confidence for VMB (was too aggressive at high FPS)
- REBLUR: removed settings "minConvergedStateBaseRadiusScale" and "maxAdaptiveRadiusScale"
- REBLUR: improved checkerboard resolve if amount of SMB is high
- REBLUR: fixed potential over-sharpening in disoccluded regions (ancient regression)
- REBLUR: increased aggressiveness of curvature correction
- REBLUR: improved hitT for tracking in TS pass
- REBLUR: fixed potential out of screen roughness check in TA pass
- REBLUR: resolved TODOs
- REBLUR: improved curvature estimation if parallax is high
- REBLUR: tuned settings of virtual parallax difference based confidence to minimize potential ghosting
- REBLUR: fixed SMB data influence on VMB in TS pass
- REBLUR: fixed bug not allowing a lower value to be clamped to a bigger value from fast history
- SPECULAR_REFLECTION_MV: updated curvature calculation math
- improved docs

.gitignore

@@ -25,6 +25,7 @@ Makefile
 *.dxbc.h
 *.dxil.h
 *.spirv.h
+NRDEncoding.hlsli
 
 # ninja
 .ninja_deps

3-Prepare NRD SDK.bat

@@ -43,6 +43,7 @@ copy "..\_Build\Debug\NRD.pdb" "Lib\Debug"
 copy "..\_Build\Release\NRD.dll" "Lib\Release"
 copy "..\_Build\Release\NRD.lib" "Lib\Release"
 copy "..\%NRD_DIR%\Shaders\Include\NRD.hlsli" "Shaders\Include"
+copy "..\%NRD_DIR%\Shaders\Include\NRDEncoding.hlsli" "Shaders\Include"
 copy "..\%NRD_DIR%\LICENSE.txt" "."
 copy "..\%NRD_DIR%\README.md" "."
 

3-Prepare NRD SDK.sh

@@ -16,6 +16,7 @@ cp -r ../$NRD_DIR/Include/ "Include"
 cp -H ../_Build/Debug/libNRD.so "Lib/Debug"
 cp -H ../_Build/Release/libNRD.so "Lib/Release"
 cp ../$NRD_DIR/Shaders/Include/NRD.hlsli "Shaders/Include"
+cp ../$NRD_DIR/Shaders/Include/NRDEncoding.hlsli "Shaders/Include"
 cp ../$NRD_DIR/LICENSE.txt "."
 cp ../$NRD_DIR/README.md "."
 

CMakeLists.txt

@@ -16,6 +16,12 @@ option(NRD_CROSSCOMPILE_AARCH64 "Cross compilation for aarch64" OFF)
 option(NRD_CROSSCOMPILE_X86_64 "Cross compilation for x86_64" OFF)
 option(NRD_INTERPROCEDURAL_OPTIMIZATION "Interprocedural optimization" OFF)
 
+file(WRITE Shaders/Include/NRDEncoding.hlsli
+"// This file is auto-generated during project deployment. Do not modify!\n"
+"#define NRD_NORMAL_ENCODING ${NRD_NORMAL_ENCODING}\n"
+"#define NRD_ROUGHNESS_ENCODING ${NRD_ROUGHNESS_ENCODING}\n"
+)
+
 file(READ "${CMAKE_CURRENT_SOURCE_DIR}/Include/NRD.h" ver_h)
 string(REGEX MATCH "NRD_VERSION_MAJOR ([0-9]*)" _ ${ver_h})
 set(ver_major ${CMAKE_MATCH_1})

Include/NRD.h

@@ -28,9 +28,9 @@ license agreement from NVIDIA CORPORATION is strictly prohibited.
 #include <cstddef>
 
 #define NRD_VERSION_MAJOR 3
-#define NRD_VERSION_MINOR 7
+#define NRD_VERSION_MINOR 8
 #define NRD_VERSION_BUILD 0
-#define NRD_VERSION_DATE "19 September 2022"
+#define NRD_VERSION_DATE "27 October 2022"
 
 #if defined(_MSC_VER)
     #define NRD_CALL __fastcall

Include/NRDDescs.h

@@ -11,7 +11,7 @@ license agreement from NVIDIA CORPORATION is strictly prohibited.
 #pragma once
 
 #define NRD_DESCS_VERSION_MAJOR 3
-#define NRD_DESCS_VERSION_MINOR 7
+#define NRD_DESCS_VERSION_MINOR 8
 
 static_assert (NRD_VERSION_MAJOR == NRD_DESCS_VERSION_MAJOR && NRD_VERSION_MINOR == NRD_DESCS_VERSION_MINOR, "Please, update all NRD SDK files");
 
@@ -180,6 +180,11 @@ namespace nrd
         IN_DIFF_CONFIDENCE,
         IN_SPEC_CONFIDENCE,
 
+        // (Optional) User-provided disocclusion threshold selector in range 0-1 (R8+)
+        // Disocclusion threshold is mixed between "disocclusionThreshold" and "disocclusionThresholdAlternate"
+        // Used only if "CommonSettings::isDisocclusionThresholdMixAvailable = true"
+        IN_DISOCCLUSION_THRESHOLD_MIX,
+
         // Noisy shadow data and optional translucency (RG16f+ and RGBA8+ for optional translucency)
         //      SIGMA: use "SIGMA_FrontEnd_PackShadow" for encoding
         IN_SHADOWDATA,
@@ -330,7 +335,7 @@ namespace nrd
         RGBA8_UNORM,
         RGBA8_SNORM,
 
-        // Moderate IQ on curved (not bumpy) surfaces, but offers optional materialID support
+        // Moderate IQ on curved (not bumpy) surfaces, but offers optional materialID support (normals are oct-packed)
         R10_G10_B10_A2_UNORM,
 
         // Best IQ on curved (not bumpy) surfaces

Include/NRDSettings.h

@@ -11,7 +11,7 @@ license agreement from NVIDIA CORPORATION is strictly prohibited.
 #pragma once
 
 #define NRD_SETTINGS_VERSION_MAJOR 3
-#define NRD_SETTINGS_VERSION_MINOR 7
+#define NRD_SETTINGS_VERSION_MINOR 8
 
 static_assert (NRD_VERSION_MAJOR == NRD_SETTINGS_VERSION_MAJOR && NRD_VERSION_MINOR == NRD_SETTINGS_VERSION_MINOR, "Please, update all NRD SDK files");
 
@@ -109,8 +109,11 @@ namespace nrd
         // (units) > 0 - use TLAS or tracing range (max value = NRD_FP16_MAX / NRD_FP16_VIEWZ_SCALE - 1 = 524031)
         float denoisingRange = 500000.0f;
 
-        // (normalized %) - if relative distance difference is greater than threshold, history gets reset (0.25-1.5% works well)
-        float disocclusionThreshold = 0.005f;
+        // (normalized %) - if relative distance difference is greater than threshold, history gets reset (0.5-2.5% works well)
+        float disocclusionThreshold = 0.01f;
+
+        // (normalized %) - alternative disocclusion threshold, which is mixed to based on IN_DISOCCLUSION_THRESHOLD_MIX
+        float disocclusionThresholdAlternate = 0.01f;
 
         // [0; 1] - enables "noisy input / denoised output" comparison
         float splitScreen = 0.0f;
@@ -133,6 +136,9 @@ namespace nrd
 
         // If "true" IN_DIFF_CONFIDENCE and IN_SPEC_CONFIDENCE are provided
         bool isHistoryConfidenceInputsAvailable = false;
+
+        // If "true" IN_DISOCCLUSION_THRESHOLD_MIX is provided
+        bool isDisocclusionThresholdMixAvailable = false;
     };
 
     // REBLUR
@@ -218,17 +224,11 @@ namespace nrd
         float specularPrepassBlurRadius = 50.0f;
 
         // (pixels) - base denoising radius (30 is a baseline for 1440p)
-        float blurRadius = 30.0f;
+        float blurRadius = 15.0f;
 
         // (pixels) - base stride between samples in history reconstruction pass
         float historyFixStrideBetweenSamples = 14.0f;
 
-        // (normalized %) - defines base blur radius shrinking when number of accumulated frames increases
-        float minConvergedStateBaseRadiusScale = 0.25f;
-
-        // [0; 10] - adaptive radius scale, comes into play if boiling is detected
-        float maxAdaptiveRadiusScale = 5.0f;
-
         // (normalized %) - base fraction of diffuse or specular lobe angle used to drive normal based rejection
         float lobeAngleFraction = 0.13f;
 
@@ -311,7 +311,7 @@ namespace nrd
         float specularVarianceBoost = 0.0f;
 
         // (degrees) - slack for the specular lobe angle used in normal based rejection of specular during A-Trous passes
-        float specularLobeAngleSlack = 0.3f;
+        float specularLobeAngleSlack = 0.15f;
 
         // (pixels) - base stride between samples in history reconstruction pass
         float historyFixStrideBetweenSamples = 14.0f;
@@ -340,10 +340,12 @@ namespace nrd
         float confidenceDrivenLuminanceEdgeStoppingRelaxation = 0.0f;
         float confidenceDrivenNormalEdgeStoppingRelaxation = 0.0f;
 
-        // How much we relax roughness based rejection in areas where specular reprojection is low
+        // How much we relax roughness based rejection for spatial filter in areas where specular reprojection is low
         float luminanceEdgeStoppingRelaxation = 0.5f;
         float normalEdgeStoppingRelaxation = 0.3f;
-        float roughnessEdgeStoppingRelaxation = 0.3f;
+
+        // How much we relax rejection for spatial filter based on roughness and view vector
+        float roughnessEdgeStoppingRelaxation = 1.0f;
 
         // If not OFF and used for DIFFUSE_SPECULAR, defines diffuse orientation, specular orientation is the opposite
         CheckerboardMode checkerboardMode = CheckerboardMode::OFF;
@@ -419,7 +421,7 @@ namespace nrd
         float roughnessFraction = 0.15f;
 
         float specularVarianceBoost = 0.0f;
-        float specularLobeAngleSlack = 0.3f;
+        float specularLobeAngleSlack = 0.15f;
 
         float historyFixEdgeStoppingNormalPower = 8.0f;
         float historyFixStrideBetweenSamples = 14.0f;
@@ -437,7 +439,7 @@ namespace nrd
 
         float luminanceEdgeStoppingRelaxation = 0.5f;
         float normalEdgeStoppingRelaxation = 0.3f;
-        float roughnessEdgeStoppingRelaxation = 0.3f;
+        float roughnessEdgeStoppingRelaxation = 1.0f;
 
         CheckerboardMode checkerboardMode = CheckerboardMode::OFF;
         HitDistanceReconstructionMode hitDistanceReconstructionMode = HitDistanceReconstructionMode::OFF;