LumenReflectionTracing.cpp File Reference

#include "RendererPrivate.h"
#include "ScenePrivate.h"
#include "SceneUtils.h"
#include "PipelineStateCache.h"
#include "ShaderParameterStruct.h"
#include "PixelShaderUtils.h"
#include "ReflectionEnvironment.h"
#include "DistanceFieldAmbientOcclusion.h"
#include "LumenReflections.h"
#include "RayTracedTranslucency.h"
#include "HairStrands/HairStrandsData.h"
#include "LumenHardwareRayTracingCommon.h"
#include "LumenTracingUtils.h"
#include "ShaderPrintParameters.h"

Classes
class	FReflectionClearTracesCS
class	FReflectionTraceScreenTexturesCS
class	FSetupCompactionIndirectArgsCS
class	FReflectionCompactTracesCS
class	FReflectionSortTracesByMaterialCS
class	FSetupReflectionCompactedTracesIndirectArgsCS
class	FReflectionTraceMeshSDFsCS
class	FReflectionTraceVoxelsCS
class	FVisualizeReflectionTracesCS

Enumerations
enum class	ECompactedReflectionTracingIndirectArgs { NumTracesDiv64 = 0 * sizeof(FRHIDispatchIndirectParameters) , NumTracesDiv32 = 1 * sizeof(FRHIDispatchIndirectParameters) , NumTracesDiv256 = 2 * sizeof(FRHIDispatchIndirectParameters) , MAX = 3 }

Functions
FAutoConsoleVariableRef	CVarLumenReflectionScreenTraces (TEXT("r.Lumen.Reflections.ScreenTraces"), GLumenReflectionScreenTraces, TEXT("Whether to trace against the screen for reflections before falling back to other methods."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenReflectionHierarchicalScreenTracesMaxIterations (TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.MaxIterations"), GLumenReflectionHierarchicalScreenTracesMaxIterations, TEXT("Max iterations for HZB tracing."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenReflectionHierarchicalScreenTracesMinimumOccupancy (TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.MinimumOccupancy"), GLumenReflectionScreenTracesMinimumOccupancy, TEXT("Minimum number of threads still tracing before aborting the trace. Can be used for scalability to abandon traces that have a disproportionate cost."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	GVarLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold (TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.RelativeDepthThickness"), GLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold, TEXT("Determines depth thickness of objects hit by HZB tracing, as a relative depth threshold."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	GVarLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness (TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.HistoryDepthTestRelativeThickness"), GLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness, TEXT("Distance between HZB trace hit and previous frame scene depth from which to allow hits, as a relative depth threshold."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	GVarLumenReflectionHairStrands_VoxelTrace (TEXT("r.Lumen.Reflections.HairStrands.VoxelTrace"), GLumenReflectionHairStrands_VoxelTrace, TEXT("Whether to trace against hair voxel structure for hair casting shadow onto opaques."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	GVarLumenReflectionHairStrands_ScreenTrace (TEXT("r.Lumen.Reflections.HairStrands.ScreenTrace"), GLumenReflectionHairStrands_ScreenTrace, TEXT("Whether to trace against hair depth for hair casting shadow onto opaques."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	GVarLumenReflectionTraceCompactionGroupSizeInTiles (TEXT("r.Lumen.Reflections.TraceCompaction.GroupSizeInTraceTiles"), GLumenReflectionTraceCompactionGroupSizeInTiles, TEXT("Size of the trace compaction threadgroup. Larger group = better coherency in the compacted traces. Currently only supported by WaveOps path."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenReflectionTraceCompactionWaveOps (TEXT("r.Lumen.Reflections.TraceCompaction.WaveOps"), GLumenReflectionTraceCompactionWaveOps, TEXT("Whether to use Wave Ops path for trace compaction."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenReflectionsSampleSceneColorAtHit (TEXT("r.Lumen.Reflections.SampleSceneColorAtHit"), GLumenReflectionsSampleSceneColorAtHit, TEXT("Whether to sample SceneColor on reflection ray hits (both SWRT and HWRT). Useful for hiding areas where Screen Traces gave up when they went behind a foreground object. 0 - Disable. 1 - Enable only when screen space traces are enabled. 2 - Always enable."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenReflectionsDistantScreenTraces (TEXT("r.Lumen.Reflections.DistantScreenTraces"), GLumenReflectionsDistantScreenTraces, TEXT("2 - Enable"), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	GVarLumenReflectionDistantScreenTraceDepthThreshold (TEXT("r.Lumen.Reflections.DistantScreenTraces.DepthThreshold"), GLumenReflectionDistantScreenTraceSlopeCompareTolerance, TEXT("Depth threshold for the linear screen traces done where other traces have missed."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	GVarLumenReflectionDistantScreenTraceMaxTraceDistance (TEXT("r.Lumen.Reflections.DistantScreenTraces.MaxTraceDistance"), GLumenReflectionDistantScreenTraceMaxTraceDistance, TEXT("Trace distance of distant screen traces."), ECVF_Scalability|ECVF_RenderThreadSafe)
TAutoConsoleVariable< float >	CVarLumenReflectionDistantScreenTraceStepOffsetBias (TEXT("r.Lumen.Reflections.DistantScreenTraces.StepOffsetBias"), 0.f, TEXT("A bias added to the ray step offset to shift the center of jittering."), ECVF_Scalability|ECVF_RenderThreadSafe)
	IMPLEMENT_GLOBAL_SHADER (FReflectionClearTracesCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "ReflectionClearTracesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FReflectionTraceScreenTexturesCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "ReflectionTraceScreenTexturesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FSetupCompactionIndirectArgsCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "SetupCompactionIndirectArgsCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FReflectionCompactTracesCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "ReflectionCompactTracesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FReflectionSortTracesByMaterialCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "ReflectionSortTracesByMaterialCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FSetupReflectionCompactedTracesIndirectArgsCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "SetupCompactedTracesIndirectArgsCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FReflectionTraceMeshSDFsCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "ReflectionTraceMeshSDFsCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FReflectionTraceVoxelsCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "ReflectionTraceVoxelsCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FVisualizeReflectionTracesCS, "/Engine/Private/Lumen/LumenReflectionTracing.usf", "VisualizeReflectionTracesCS", SF_Compute)
void	SetupIndirectTracingParametersForReflections (const FViewInfo &View, FLumenIndirectTracingParameters &OutParameters)
FLumenHZBScreenTraceParameters	SetupHZBScreenTraceParameters (FRDGBuilder &GraphBuilder, const FViewInfo &View, const FSceneTextures &SceneTextures)
void	TraceReflections (FRDGBuilder &GraphBuilder, const FScene *Scene, const FViewInfo &View, const FLumenSceneFrameTemporaries &FrameTemporaries, bool bTraceMeshObjects, const FSceneTextures &SceneTextures, const FLumenReflectionTracingParameters &ReflectionTracingParameters, const FLumenReflectionTileParameters &ReflectionTileParameters, const FLumenMeshSDFGridParameters &InMeshSDFGridParameters, bool bUseRadianceCache, EDiffuseIndirectMethod DiffuseIndirectMethod, const LumenRadianceCache::FRadianceCacheInterpolationParameters &RadianceCacheParameters, const FBoxSphereBounds &FirstPersonWorldSpaceRepresentationViewBounds, ERDGPassFlags ComputePassFlags)
void	TraceTranslucency (FRDGBuilder &GraphBuilder, const FScene *Scene, const FViewInfo &View, const FLumenSceneFrameTemporaries &FrameTemporaries, const FSceneTextures &SceneTextures, const FLumenReflectionTracingParameters &ReflectionTracingParameters, const FLumenReflectionTileParameters &ReflectionTileParameters, EDiffuseIndirectMethod DiffuseIndirectMethod, ERDGPassFlags ComputePassFlags, bool bUseRayTracedRefraction)

Variables
int32	GLumenReflectionScreenTraces = 1
int32	GLumenScreenTracingSource = 0
FAutoConsoleVariableRef	CVarLumenScreenTracingSource (TEXT("r.Lumen.ScreenTracingSource"), GLumenScreenTracingSource, TEXT("1: Anti-aliased Scene Color (translucency intersected with the opaque depths, less noise from small emissive elements)"), ECVF_RenderThreadSafe)
int32	GLumenReflectionHierarchicalScreenTracesMaxIterations = 50
int32	GLumenReflectionScreenTracesMinimumOccupancy = 0
float	GLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold = .005f
float	GLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness = .005f
int32	GLumenReflectionHairStrands_VoxelTrace = 1
int32	GLumenReflectionHairStrands_ScreenTrace = 1
int32	GLumenReflectionTraceCompactionGroupSizeInTiles = 16
int32	GLumenReflectionTraceCompactionWaveOps = 1
int32	GLumenReflectionsSampleSceneColorAtHit = 1
TAutoConsoleVariable< float >	GVarLumenReflectionSampleSceneColorRelativeDepthThreshold (TEXT("r.Lumen.Reflections.SampleSceneColorRelativeDepthThickness"), 0.01f, TEXT("Depth threshold that controls how close ray hits have to be to the depth buffer, before sampling SceneColor is allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)
TAutoConsoleVariable< float >	CVarLumenReflectionsSampleSceneColorNormalTreshold (TEXT("r.Lumen.Reflections.SampleSceneColorNormalTreshold"), 85.0f, TEXT("Normal threshold in degrees that controls how close ray hit normal and screen normal have to be, before sampling SceneColor is allowed. 0 - only exactly matching normals allowed. 180 - all normals allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)
TAutoConsoleVariable< float >	GVarLumenReflectionsFarFieldSampleSceneColorRelativeDepthThreshold (TEXT("r.Lumen.Reflections.FarField.SampleSceneColorRelativeDepthThickness"), 0.1f, TEXT("Depth threshold for far field traces that controls how close ray hits have to be to the depth buffer, before sampling SceneColor is allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)
TAutoConsoleVariable< float >	CVarLumenReflectionsFarFieldSampleSceneColorNormalTreshold (TEXT("r.Lumen.Reflections.FarField.SampleSceneColorNormalTreshold"), 85.0f, TEXT("Normal threshold in degrees for far field traces that controls how close ray hit normal and screen normal have to be, before sampling SceneColor is allowed. 0 - only exactly matching normals allowed. 180 - all normals allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)
int32	GLumenReflectionsDistantScreenTraces = 1
float	GLumenReflectionDistantScreenTraceSlopeCompareTolerance = 2.0f
float	GLumenReflectionDistantScreenTraceMaxTraceDistance = 200000.0f

Enumeration Type Documentation

ECompactedReflectionTracingIndirectArgs

enum class ECompactedReflectionTracingIndirectArgs

strong

Enumerator
NumTracesDiv64
NumTracesDiv32
NumTracesDiv256
MAX

Function Documentation

CVarLumenReflectionDistantScreenTraceStepOffsetBias()

TAutoConsoleVariable< float > CVarLumenReflectionDistantScreenTraceStepOffsetBias	(	TEXT("r.Lumen.Reflections.DistantScreenTraces.StepOffsetBias")	,
		0.	f,
		TEXT("A bias added to the ray step offset to shift the center of jittering.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenReflectionHierarchicalScreenTracesMaxIterations()

FAutoConsoleVariableRef CVarLumenReflectionHierarchicalScreenTracesMaxIterations	(	TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.MaxIterations")	,
		GLumenReflectionHierarchicalScreenTracesMaxIterations	,
		TEXT("Max iterations for HZB tracing.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenReflectionHierarchicalScreenTracesMinimumOccupancy()

FAutoConsoleVariableRef CVarLumenReflectionHierarchicalScreenTracesMinimumOccupancy	(	TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.MinimumOccupancy")	,
		GLumenReflectionScreenTracesMinimumOccupancy	,
		TEXT("Minimum number of threads still tracing before aborting the trace. Can be used for scalability to abandon traces that have a disproportionate cost.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenReflectionScreenTraces()

FAutoConsoleVariableRef CVarLumenReflectionScreenTraces	(	TEXT("r.Lumen.Reflections.ScreenTraces")	,
		GLumenReflectionScreenTraces	,
		TEXT("Whether to trace against the screen for reflections before falling back to other methods.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenReflectionsDistantScreenTraces()

FAutoConsoleVariableRef CVarLumenReflectionsDistantScreenTraces	(	TEXT("r.Lumen.Reflections.DistantScreenTraces")	,
		GLumenReflectionsDistantScreenTraces	,
		TEXT("2 - Enable")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenReflectionsSampleSceneColorAtHit()

FAutoConsoleVariableRef CVarLumenReflectionsSampleSceneColorAtHit	(	TEXT("r.Lumen.Reflections.SampleSceneColorAtHit")	,
		GLumenReflectionsSampleSceneColorAtHit	,
		TEXT("Whether to sample SceneColor on reflection ray hits (both SWRT and HWRT). Useful for hiding areas where Screen Traces gave up when they went behind a foreground object. 0 - Disable. 1 - Enable only when screen space traces are enabled. 2 - Always enable.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenReflectionTraceCompactionWaveOps()

FAutoConsoleVariableRef CVarLumenReflectionTraceCompactionWaveOps	(	TEXT("r.Lumen.Reflections.TraceCompaction.WaveOps")	,
		GLumenReflectionTraceCompactionWaveOps	,
		TEXT("Whether to use Wave Ops path for trace compaction.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionDistantScreenTraceDepthThreshold()

FAutoConsoleVariableRef GVarLumenReflectionDistantScreenTraceDepthThreshold	(	TEXT("r.Lumen.Reflections.DistantScreenTraces.DepthThreshold")	,
		GLumenReflectionDistantScreenTraceSlopeCompareTolerance	,
		TEXT("Depth threshold for the linear screen traces done where other traces have missed.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionDistantScreenTraceMaxTraceDistance()

FAutoConsoleVariableRef GVarLumenReflectionDistantScreenTraceMaxTraceDistance	(	TEXT("r.Lumen.Reflections.DistantScreenTraces.MaxTraceDistance")	,
		GLumenReflectionDistantScreenTraceMaxTraceDistance	,
		TEXT("Trace distance of distant screen traces.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionHairStrands_ScreenTrace()

FAutoConsoleVariableRef GVarLumenReflectionHairStrands_ScreenTrace	(	TEXT("r.Lumen.Reflections.HairStrands.ScreenTrace")	,
		GLumenReflectionHairStrands_ScreenTrace	,
		TEXT("Whether to trace against hair depth for hair casting shadow onto opaques.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionHairStrands_VoxelTrace()

FAutoConsoleVariableRef GVarLumenReflectionHairStrands_VoxelTrace	(	TEXT("r.Lumen.Reflections.HairStrands.VoxelTrace")	,
		GLumenReflectionHairStrands_VoxelTrace	,
		TEXT("Whether to trace against hair voxel structure for hair casting shadow onto opaques.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness()

FAutoConsoleVariableRef GVarLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness	(	TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.HistoryDepthTestRelativeThickness")	,
		GLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness	,
		TEXT("Distance between HZB trace hit and previous frame scene depth from which to allow hits, as a relative depth threshold.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold()

FAutoConsoleVariableRef GVarLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold	(	TEXT("r.Lumen.Reflections.HierarchicalScreenTraces.RelativeDepthThickness")	,
		GLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold	,
		TEXT("Determines depth thickness of objects hit by HZB tracing, as a relative depth threshold.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionTraceCompactionGroupSizeInTiles()

FAutoConsoleVariableRef GVarLumenReflectionTraceCompactionGroupSizeInTiles	(	TEXT("r.Lumen.Reflections.TraceCompaction.GroupSizeInTraceTiles")	,
		GLumenReflectionTraceCompactionGroupSizeInTiles	,
		TEXT("Size of the trace compaction threadgroup. Larger group = better coherency in the compacted traces. Currently only supported by WaveOps path.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

IMPLEMENT_GLOBAL_SHADER() [1/9]

IMPLEMENT_GLOBAL_SHADER	(	FReflectionClearTracesCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"ReflectionClearTracesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [2/9]

IMPLEMENT_GLOBAL_SHADER	(	FReflectionCompactTracesCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"ReflectionCompactTracesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [3/9]

IMPLEMENT_GLOBAL_SHADER	(	FReflectionSortTracesByMaterialCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"ReflectionSortTracesByMaterialCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [4/9]

IMPLEMENT_GLOBAL_SHADER	(	FReflectionTraceMeshSDFsCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"ReflectionTraceMeshSDFsCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [5/9]

IMPLEMENT_GLOBAL_SHADER	(	FReflectionTraceScreenTexturesCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"ReflectionTraceScreenTexturesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [6/9]

IMPLEMENT_GLOBAL_SHADER	(	FReflectionTraceVoxelsCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"ReflectionTraceVoxelsCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [7/9]

IMPLEMENT_GLOBAL_SHADER	(	FSetupCompactionIndirectArgsCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"SetupCompactionIndirectArgsCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [8/9]

IMPLEMENT_GLOBAL_SHADER	(	FSetupReflectionCompactedTracesIndirectArgsCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"SetupCompactedTracesIndirectArgsCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [9/9]

IMPLEMENT_GLOBAL_SHADER	(	FVisualizeReflectionTracesCS	,
		"/Engine/Private/Lumen/LumenReflectionTracing.usf"	,
		"VisualizeReflectionTracesCS"	,
		SF_Compute
	)

SetupHZBScreenTraceParameters()

FLumenHZBScreenTraceParameters SetupHZBScreenTraceParameters	(	FRDGBuilder &	GraphBuilder,
		const FViewInfo &	View,
		const FSceneTextures &	SceneTextures
	)

SetupIndirectTracingParametersForReflections()

void SetupIndirectTracingParametersForReflections	(	const FViewInfo &	View,
		FLumenIndirectTracingParameters &	OutParameters
	)

TraceReflections()

void TraceReflections	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		const FLumenSceneFrameTemporaries &	FrameTemporaries,
		bool	bTraceMeshObjects,
		const FSceneTextures &	SceneTextures,
		const FLumenReflectionTracingParameters &	ReflectionTracingParameters,
		const FLumenReflectionTileParameters &	ReflectionTileParameters,
		const FLumenMeshSDFGridParameters &	InMeshSDFGridParameters,
		bool	bUseRadianceCache,
		EDiffuseIndirectMethod	DiffuseIndirectMethod,
		const LumenRadianceCache::FRadianceCacheInterpolationParameters &	RadianceCacheParameters,
		const FBoxSphereBounds &	FirstPersonWorldSpaceRepresentationViewBounds,
		ERDGPassFlags	ComputePassFlags
	)

TraceTranslucency()

void TraceTranslucency	(	FRDGBuilder &	GraphBuilder,
		const FScene *	Scene,
		const FViewInfo &	View,
		const FLumenSceneFrameTemporaries &	FrameTemporaries,
		const FSceneTextures &	SceneTextures,
		const FLumenReflectionTracingParameters &	ReflectionTracingParameters,
		const FLumenReflectionTileParameters &	ReflectionTileParameters,
		EDiffuseIndirectMethod	DiffuseIndirectMethod,
		ERDGPassFlags	ComputePassFlags,
		bool	bUseRayTracedRefraction
	)

Variable Documentation

CVarLumenReflectionsFarFieldSampleSceneColorNormalTreshold

TAutoConsoleVariable< float > CVarLumenReflectionsFarFieldSampleSceneColorNormalTreshold(TEXT("r.Lumen.Reflections.FarField.SampleSceneColorNormalTreshold"), 85.0f, TEXT("Normal threshold in degrees for far field traces that controls how close ray hit normal and screen normal have to be, before sampling SceneColor is allowed. 0 - only exactly matching normals allowed. 180 - all normals allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)	(	TEXT("r.Lumen.Reflections.FarField.SampleSceneColorNormalTreshold")	,
		85.	0f,
		TEXT("Normal threshold in degrees for far field traces that controls how close ray hit normal and screen normal have to be, before sampling SceneColor is allowed. 0 - only exactly matching normals allowed. 180 - all normals allowed.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenReflectionsSampleSceneColorNormalTreshold

TAutoConsoleVariable< float > CVarLumenReflectionsSampleSceneColorNormalTreshold(TEXT("r.Lumen.Reflections.SampleSceneColorNormalTreshold"), 85.0f, TEXT("Normal threshold in degrees that controls how close ray hit normal and screen normal have to be, before sampling SceneColor is allowed. 0 - only exactly matching normals allowed. 180 - all normals allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)	(	TEXT("r.Lumen.Reflections.SampleSceneColorNormalTreshold")	,
		85.	0f,
		TEXT("Normal threshold in degrees that controls how close ray hit normal and screen normal have to be, before sampling SceneColor is allowed. 0 - only exactly matching normals allowed. 180 - all normals allowed.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenScreenTracingSource

FAutoConsoleVariableRef CVarLumenScreenTracingSource(TEXT("r.Lumen.ScreenTracingSource"), GLumenScreenTracingSource, TEXT("1: Anti-aliased Scene Color (translucency intersected with the opaque depths, less noise from small emissive elements)"), ECVF_RenderThreadSafe)	(	TEXT("r.Lumen.ScreenTracingSource")	,
		GLumenScreenTracingSource	,
		TEXT("1: Anti-aliased Scene Color (translucency intersected with the opaque depths, less noise from small emissive elements)")	,
		ECVF_RenderThreadSafe
	)

GLumenReflectionDistantScreenTraceMaxTraceDistance

float GLumenReflectionDistantScreenTraceMaxTraceDistance = 200000.0f

GLumenReflectionDistantScreenTraceSlopeCompareTolerance

float GLumenReflectionDistantScreenTraceSlopeCompareTolerance = 2.0f

GLumenReflectionHairStrands_ScreenTrace

int32 GLumenReflectionHairStrands_ScreenTrace = 1

GLumenReflectionHairStrands_VoxelTrace

int32 GLumenReflectionHairStrands_VoxelTrace = 1

GLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness

float GLumenReflectionHierarchicalScreenTraceHistoryDepthTestRelativeThickness = .005f

GLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold

float GLumenReflectionHierarchicalScreenTraceRelativeDepthThreshold = .005f

GLumenReflectionHierarchicalScreenTracesMaxIterations

int32 GLumenReflectionHierarchicalScreenTracesMaxIterations = 50

GLumenReflectionScreenTraces

int32 GLumenReflectionScreenTraces = 1

GLumenReflectionScreenTracesMinimumOccupancy

int32 GLumenReflectionScreenTracesMinimumOccupancy = 0

GLumenReflectionsDistantScreenTraces

int32 GLumenReflectionsDistantScreenTraces = 1

GLumenReflectionsSampleSceneColorAtHit

int32 GLumenReflectionsSampleSceneColorAtHit = 1

GLumenReflectionTraceCompactionGroupSizeInTiles

int32 GLumenReflectionTraceCompactionGroupSizeInTiles = 16

GLumenReflectionTraceCompactionWaveOps

int32 GLumenReflectionTraceCompactionWaveOps = 1

GLumenScreenTracingSource

int32 GLumenScreenTracingSource = 0

GVarLumenReflectionSampleSceneColorRelativeDepthThreshold

TAutoConsoleVariable< float > GVarLumenReflectionSampleSceneColorRelativeDepthThreshold(TEXT("r.Lumen.Reflections.SampleSceneColorRelativeDepthThickness"), 0.01f, TEXT("Depth threshold that controls how close ray hits have to be to the depth buffer, before sampling SceneColor is allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)	(	TEXT("r.Lumen.Reflections.SampleSceneColorRelativeDepthThickness")	,
		0.	01f,
		TEXT("Depth threshold that controls how close ray hits have to be to the depth buffer, before sampling SceneColor is allowed.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GVarLumenReflectionsFarFieldSampleSceneColorRelativeDepthThreshold

TAutoConsoleVariable< float > GVarLumenReflectionsFarFieldSampleSceneColorRelativeDepthThreshold(TEXT("r.Lumen.Reflections.FarField.SampleSceneColorRelativeDepthThickness"), 0.1f, TEXT("Depth threshold for far field traces that controls how close ray hits have to be to the depth buffer, before sampling SceneColor is allowed."), ECVF_Scalability|ECVF_RenderThreadSafe)	(	TEXT("r.Lumen.Reflections.FarField.SampleSceneColorRelativeDepthThickness")	,
		0.	1f,
		TEXT("Depth threshold for far field traces that controls how close ray hits have to be to the depth buffer, before sampling SceneColor is allowed.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)