GlobalDistanceField.cpp File Reference

#include "GlobalDistanceField.h"
#include "GlobalDistanceFieldReadback.h"
#include "ClearQuad.h"
#include "DataDrivenShaderPlatformInfo.h"
#include "DistanceFieldAmbientOcclusion.h"
#include "DistanceFieldLightingShared.h"
#include "DynamicMeshBuilder.h"
#include "DynamicPrimitiveDrawing.h"
#include "Engine/VolumeTexture.h"
#include "GlobalDistanceFieldHeightfields.h"
#include "Lumen/Lumen.h"
#include "RendererModule.h"
#include "ScenePrivate.h"
#include "TextureResource.h"
#include "HeightfieldLighting.h"

Classes
class	FCullObjectsToClipmapCS
class	FClearIndirectArgBufferCS
class	FBuildGridTilesCS
class	FCullObjectsToGridCS
class	FCompositeObjectsIntoObjectGridPagesCS
class	FCompositeObjectsIntoPagesCS
class	FInitPageFreeListCS
class	FAllocatePagesCS
class	FPageFreeListReturnIndirectArgBufferCS
class	FPageFreeListReturnCS
class	FPropagateMipDistanceCS
class	FGlobalDistanceFieldAccumulateUpdatedPagesCS
class	FGlobalDistanceFieldPageStatsCS
class	FGlobalDistanceFieldDebugCS
struct	FGlobalDistanceFieldInfoRDG
struct	FGlobalDistanceFieldPackedClipmap

Namespaces
namespace	GlobalDistanceField

Functions
	DECLARE_GPU_STAT (GlobalDistanceFieldUpdate)
FAutoConsoleVariableRef	CVarAOGlobalDistanceField (TEXT("r.AOGlobalDistanceField"), GAOGlobalDistanceField, TEXT("The global distance field is created by compositing object distance fields into clipmaps as the viewer moves through the level."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldOccupancyRatio (TEXT("r.AOGlobalDistanceField.OccupancyRatio"), GGlobalDistanceFieldOccupancyRatio, TEXT("Expected sparse global distacne field occupancy for the page atlas allocation. 0.25 means 25% - filled and 75% - empty."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldNumClipmaps (TEXT("r.AOGlobalDistanceField.NumClipmaps"), GAOGlobalDistanceFieldNumClipmaps, TEXT("Num clipmaps in the global distance field. Setting this to anything other than 4 is currently only supported by Lumen."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldHeightfield (TEXT("r.AOGlobalDistanceField.Heightfield"), GAOGlobalDistanceFieldHeightfield, TEXT("Whether to voxelize Heightfield into the global distance field.\n"), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOUpdateGlobalDistanceField (TEXT("r.AOUpdateGlobalDistanceField"), GAOUpdateGlobalDistanceField, TEXT("Whether to update the global distance field, useful for debugging."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldCacheMostlyStaticSeparately (TEXT("r.AOGlobalDistanceFieldCacheMostlyStaticSeparately"), GAOGlobalDistanceFieldCacheMostlyStaticSeparately, TEXT("Whether to cache mostly static primitives separately from movable primitives, which reduces global DF update cost when a movable primitive is modified. Adds another 12Mb of volume textures."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldPartialUpdates (TEXT("r.AOGlobalDistanceFieldPartialUpdates"), GAOGlobalDistanceFieldPartialUpdates, TEXT("Whether to allow partial updates of the global distance field. When profiling it's useful to disable this and get the worst case composition time that happens on camera cuts."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldStaggeredUpdatess (TEXT("r.AOGlobalDistanceFieldStaggeredUpdates"), GAOGlobalDistanceFieldStaggeredUpdates, TEXT("Whether to allow the larger clipmaps to be updated less frequently."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldClipmapUpdatesPerFrame (TEXT("r.AOGlobalDistanceFieldClipmapUpdatesPerFrame"), GAOGlobalDistanceFieldClipmapUpdatesPerFrame, TEXT("How many clipmaps to update each frame. With values less than 2, the first clipmap is only updated every other frame, which can cause incorrect self occlusion during movement."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldForceFullUpdate (TEXT("r.AOGlobalDistanceFieldForceFullUpdate"), GAOGlobalDistanceFieldForceFullUpdate, TEXT("Whether to force full global distance field update every frame."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldForceUpdateOnce (TEXT("r.AOGlobalDistanceFieldForceUpdateOnce"), GAOGlobalDistanceFieldForceUpdateOnce, TEXT("Whether to force full global distance field once."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDFClipmapDistanceExponent (TEXT("r.AOGlobalDFClipmapDistanceExponent"), GAOGlobalDFClipmapDistanceExponent, TEXT("Exponent used to derive each clipmap's size, together with r.AOInnerGlobalDFClipmapDistance."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDFResolution (TEXT("r.AOGlobalDFResolution"), GAOGlobalDFResolution, TEXT("Resolution of the global distance field. Higher values increase fidelity but also increase memory and composition cost."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDFStartDistance (TEXT("r.AOGlobalDFStartDistance"), GAOGlobalDFStartDistance, TEXT("This has to be large enough to hide the low res nature of the global distance field, but smaller values result in faster cone tracing."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldRepresentHeightfields (TEXT("r.AOGlobalDistanceFieldRepresentHeightfields"), GAOGlobalDistanceFieldRepresentHeightfields, TEXT("Whether to put landscape in the global distance field. Changing this won't propagate until the global distance field gets recached (fly away and back)."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarGlobalDistanceFieldHeightFieldThicknessScale (TEXT("r.GlobalDistanceFieldHeightFieldThicknessScale"), GGlobalDistanceFieldHeightFieldThicknessScale, TEXT("Thickness of the height field when it's entered into the global distance field, measured in distance field voxels. Defaults to 4 which means 4x the voxel size as thickness."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels (TEXT("r.AOGlobalDistanceField.MinMeshSDFRadiusInVoxels"), GAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels, TEXT("Meshes with a smaller radius than this number of voxels are culled from the global SDF."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay (TEXT("r.AOGlobalDistanceField.CameraPositionVelocityOffsetDecay"), GAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay, TEXT(""), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldMipFactor (TEXT("r.AOGlobalDistanceField.MipFactor"), GAOGlobalDistanceFieldMipFactor, TEXT("Resolution divider for the mip map of a distance field clipmap."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming (TEXT("r.AOGlobalDistanceField.RecacheClipmapsWithPendingStreaming"), GAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming, TEXT("Whether to readback clipmaps cached with incomplete Mesh SDFs due to streaming and recache them on subsequent frames. Fixes innaccurate Global SDF around the camera after teleporting or loading a new level."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldForceRecacheForStreaming (TEXT("r.AOGlobalDistanceField.ForceRecacheForStreaming"), GAOGlobalDistanceFieldForceRecacheForStreaming, TEXT("Useful for debugging or profiling full clipmap updates that happen when a clipmap is detected to have pending streaming."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenSceneGlobalSDFCoveredExpandSurfaceScale (TEXT("r.LumenScene.GlobalSDF.CoveredExpandSurfaceScale"), GLumenSceneGlobalSDFCoveredExpandSurfaceScale, TEXT("Scales the half voxel SDF expand used by the Global SDF to reconstruct surfaces that are thinner than the distance between two voxels, erring on the side of over-occlusion."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenScenGlobalSDFNotCoveredExpandSurfaceScale (TEXT("r.LumenScene.GlobalSDF.NotCoveredExpandSurfaceScale"), GLumenSceneGlobalSDFNotCoveredExpandSurfaceScale, TEXT("Scales the half voxel SDF expand used by the Global SDF to reconstruct surfaces that are thinner than the distance between two voxels, for regions of space that only contain Two Sided Mesh SDFs."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenSceneGlobalSDFSimpleCoverageBasedExpand (TEXT("r.LumenScene.GlobalSDF.SimpleCoverageBasedExpand"), GLumenSceneGlobalSDFSimpleCoverageBasedExpand, TEXT("Whether to use simple coverage based surface expansion. Less accurate but does not sample the coverage texture."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenScenGlobalSDFNotCoveredMinStepScale (TEXT("r.LumenScene.GlobalSDF.NotCoveredMinStepScale"), GLumenSceneGlobalSDFNotCoveredMinStepScale, TEXT("Scales the min step size to improve performance, for regions of space that only contain Two Sided Mesh SDFs."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenSceneGlobalSDFDitheredTransparencyStepThreshold (TEXT("r.LumenScene.GlobalSDF.DitheredTransparencyStepThreshold"), GLumenSceneGlobalSDFDitheredTransparencyStepThreshold, TEXT("Per-step stochastic semi-transparency threshold, for tracing users that have dithered transparency enabled, for regions of space that only contain Two Sided Mesh SDFs."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarLumenSceneGlobalSDFDitheredTransparencyTraceThreshold (TEXT("r.LumenScene.GlobalSDF.DitheredTransparencyTraceThreshold"), GLumenSceneGlobalSDFDitheredTransparencyTraceThreshold, TEXT("Per-trace stochastic semi-transparency threshold, for tracing users that have dithered transparency enabled, for regions of space that only contain Two Sided Mesh SDFs. Anything less than 1 causes leaking."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarGlobalDistanceFieldDebugForceMovementUpdate (TEXT("r.GlobalDistanceField.Debug.ForceMovementUpdate"), GGlobalDistanceFieldDebugForceMovementUpdate, TEXT("Whether to force N texel border on X, Y and Z update each frame."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarGlobalDistanceFieldDebugLogModifiedPrimitives (TEXT("r.GlobalDistanceField.Debug.LogModifiedPrimitives"), GGlobalDistanceFieldDebugLogModifiedPrimitives, TEXT("Pass 2 to log only non movable object updates."), ECVF_Scalability|ECVF_RenderThreadSafe)
FAutoConsoleVariableRef	CVarGlobalDistanceFieldDebugDrawModifiedPrimitives (TEXT("r.GlobalDistanceField.Debug.DrawModifiedPrimitives"), GGlobalDistanceFieldDebugDrawModifiedPrimitives, TEXT("This can be useful for tracking down why updating the global distance field is always costing a lot, since it should be mostly cached."), ECVF_Scalability|ECVF_RenderThreadSafe)
bool	UseGlobalDistanceField ()
bool	UseGlobalDistanceField (const FDistanceFieldAOParameters &Parameters)
FGlobalDistanceFieldParameters2	SetupGlobalDistanceFieldParameters (const FGlobalDistanceFieldParameterData &ParameterData)
const TCHAR *	GetRecaptureReasonString (EGlobalSDFFullRecaptureReason Reason)
float	GetMinMeshSDFRadius (float VoxelWorldSize)
int32	GetNumClipmapUpdatesPerFrame ()
void	RequestGlobalDistanceFieldReadback (FGlobalDistanceFieldReadback *Readback)
void	RequestGlobalDistanceFieldReadback_GameThread (FGlobalDistanceFieldReadback *Readback)
FVector	ClampCameraVelocityOffset (FVector CameraVelocityOffset, int32 ClipmapIndex, const FScene *Scene, bool bLumenEnabled)
FVector	GetGlobalDistanceFieldViewOrigin (const FViewInfo &View, int32 ClipmapIndex, bool bLumenEnabled)
void	ReadbackDistanceFieldClipmap (FRHICommandListImmediate &RHICmdList, FGlobalDistanceFieldInfo &GlobalDistanceFieldInfo)
	IMPLEMENT_GLOBAL_SHADER (FCullObjectsToClipmapCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "CullObjectsToClipmapCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FClearIndirectArgBufferCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "ClearIndirectArgBufferCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FBuildGridTilesCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "BuildGridTilesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FCullObjectsToGridCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "CullObjectsToGridCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FCompositeObjectsIntoObjectGridPagesCS, "/Engine/Private/DistanceField/GlobalDistanceFieldCompositeObjects.usf", "CompositeObjectsIntoObjectGridPagesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FCompositeObjectsIntoPagesCS, "/Engine/Private/DistanceField/GlobalDistanceFieldCompositeObjects.usf", "CompositeObjectsIntoPagesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FInitPageFreeListCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "InitPageFreeListCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FAllocatePagesCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "AllocatePagesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FPageFreeListReturnIndirectArgBufferCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "PageFreeListReturnIndirectArgBufferCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FPageFreeListReturnCS, "/Engine/Private/DistanceField/GlobalDistanceField.usf", "PageFreeListReturnCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FPropagateMipDistanceCS, "/Engine/Private/DistanceField/GlobalDistanceFieldMip.usf", "PropagateMipDistanceCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FGlobalDistanceFieldAccumulateUpdatedPagesCS, "/Engine/Private/DistanceField/GlobalDistanceFieldDebug.usf", "GlobalDistanceFieldAccumulateUpdatedPagesCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FGlobalDistanceFieldPageStatsCS, "/Engine/Private/DistanceField/GlobalDistanceFieldDebug.usf", "GlobalDistanceFieldPageStatsCS", SF_Compute)
	IMPLEMENT_GLOBAL_SHADER (FGlobalDistanceFieldDebugCS, "/Engine/Private/DistanceField/GlobalDistanceFieldDebug.usf", "GlobalDistanceFieldDebugCS", SF_Compute)
void	UpdateGlobalDistanceFieldCache (FRDGBuilder &GraphBuilder, FViewInfo &View, FScene *Scene, int32 CacheType, TArray< FGlobalDistanceFieldClipmap > &Clipmaps, FRDGBufferRef PageStatsBuffer, FRDGBufferRef PageObjectGridBuffer, FRDGTextureRef PageTableLayerTexture, FRDGTextureRef ParentPageTableLayerTexture, FRDGTextureRef PageTableCombinedTexture, FRDGTextureRef PageAtlasTexture, FRDGTextureRef CoverageAtlasTexture, FRDGTextureRef MipTexture, FRDGBufferRef PageFreeListAllocatorBuffer, FRDGBufferRef PageFreeListBuffer, bool bLumenEnabled)
void	UpdateGlobalDistanceFieldVolume (FRDGBuilder &GraphBuilder, FRDGExternalAccessQueue &ExternalAccessQueue, FViewInfo &View, FScene *Scene, float MaxOcclusionDistance, bool bLumenEnabled, FGlobalDistanceFieldInfo &GlobalDistanceFieldInfo)

Variables
int32	GDistanceFieldOffsetDataStructure
int32	GAOGlobalDistanceField = 1
float	GGlobalDistanceFieldOccupancyRatio = 0.3f
int32	GAOGlobalDistanceFieldNumClipmaps = 4
int32	GAOGlobalDistanceFieldHeightfield = 1
int32	GAOUpdateGlobalDistanceField = 1
int32	GAOGlobalDistanceFieldCacheMostlyStaticSeparately = 1
int32	GAOGlobalDistanceFieldPartialUpdates = 1
int32	GAOGlobalDistanceFieldStaggeredUpdates = 1
int32	GAOGlobalDistanceFieldClipmapUpdatesPerFrame = 2
int32	GAOGlobalDistanceFieldForceFullUpdate = 0
int32	GAOGlobalDistanceFieldForceUpdateOnce = 0
float	GAOGlobalDFClipmapDistanceExponent = 2
int32	GAOGlobalDFResolution = 128
float	GAOGlobalDFStartDistance = 100
int32	GAOGlobalDistanceFieldRepresentHeightfields = 1
float	GGlobalDistanceFieldHeightFieldThicknessScale = 4.0f
float	GAOGlobalDistanceFieldMinMeshSDFRadius = 20
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldMinMeshSDFRadius (TEXT("r.AOGlobalDistanceField.MinMeshSDFRadius"), GAOGlobalDistanceFieldMinMeshSDFRadius, TEXT("Meshes with a smaller world space radius than this are culled from the global SDF."), ECVF_RenderThreadSafe)
float	GAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels = .5f
float	GAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay = .7f
int32	GAOGlobalDistanceFieldFastCameraMode = 0
FAutoConsoleVariableRef	CVarAOGlobalDistanceFieldFastCameraMode (TEXT("r.AOGlobalDistanceField.FastCameraMode"), GAOGlobalDistanceFieldFastCameraMode, TEXT("Whether to update the Global SDF for fast camera movement - lower quality, faster updates so lighting can keep up with the camera."), ECVF_RenderThreadSafe)
int32	GAOGlobalDistanceFieldMipFactor = 4
int32	GAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming = 1
int32	GAOGlobalDistanceFieldForceRecacheForStreaming = 0
float	GLumenSceneGlobalSDFCoveredExpandSurfaceScale = 1.0f
float	GLumenSceneGlobalSDFNotCoveredExpandSurfaceScale = .6f
int32	GLumenSceneGlobalSDFSimpleCoverageBasedExpand = 0
float	GLumenSceneGlobalSDFNotCoveredMinStepScale = 4.0f
float	GLumenSceneGlobalSDFDitheredTransparencyStepThreshold = .5f
float	GLumenSceneGlobalSDFDitheredTransparencyTraceThreshold = .9f
TAutoConsoleVariable< bool >	CVarGlobalDistanceFieldDebugShowStats (TEXT("r.GlobalDistanceField.Debug.ShowStats"), 0, TEXT("Debug drawing for the Global Distance Field."), ECVF_Scalability|ECVF_RenderThreadSafe)
int32	GGlobalDistanceFieldDebugForceMovementUpdate = 0
int32	GGlobalDistanceFieldDebugLogModifiedPrimitives = 0
int32	GGlobalDistanceFieldDebugDrawModifiedPrimitives = 0
const int32	GlobalDistanceField::CullGridFactor = 4
const int32	GlobalDistanceField::PageAtlasSizeInPagesX = 128
const int32	GlobalDistanceField::PageAtlasSizeInPagesY = 128
const int32	GlobalDistanceField::ObjectGridPageBufferStride = 4 * sizeof(uint32)
const int32	GlobalDistanceField::ObjectGridPageBufferNumElementsPerPage = 4 * 4 * 4
const int32	GGlobalDistanceFieldPageResolutionInAtlas = 8
const int32	GGlobalDistanceFieldCoveragePageResolutionInAtlas = 4
const int32	GGlobalDistanceFieldPageResolution = GGlobalDistanceFieldPageResolutionInAtlas - 1
const int32	GGlobalDistanceFieldInfluenceRangeInVoxels = 4

Function Documentation

ClampCameraVelocityOffset()

FVector ClampCameraVelocityOffset	(	FVector	CameraVelocityOffset,
		int32	ClipmapIndex,
		const FScene *	Scene,
		bool	bLumenEnabled
	)

CVarAOGlobalDFClipmapDistanceExponent()

FAutoConsoleVariableRef CVarAOGlobalDFClipmapDistanceExponent	(	TEXT("r.AOGlobalDFClipmapDistanceExponent")	,
		GAOGlobalDFClipmapDistanceExponent	,
		TEXT("Exponent used to derive each clipmap's size, together with r.AOInnerGlobalDFClipmapDistance.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDFResolution()

FAutoConsoleVariableRef CVarAOGlobalDFResolution	(	TEXT("r.AOGlobalDFResolution")	,
		GAOGlobalDFResolution	,
		TEXT("Resolution of the global distance field. Higher values increase fidelity but also increase memory and composition cost.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDFStartDistance()

FAutoConsoleVariableRef CVarAOGlobalDFStartDistance	(	TEXT("r.AOGlobalDFStartDistance")	,
		GAOGlobalDFStartDistance	,
		TEXT("This has to be large enough to hide the low res nature of the global distance field, but smaller values result in faster cone tracing.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceField()

FAutoConsoleVariableRef CVarAOGlobalDistanceField	(	TEXT("r.AOGlobalDistanceField")	,
		GAOGlobalDistanceField	,
		TEXT("The global distance field is created by compositing object distance fields into clipmaps as the viewer moves through the level.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldCacheMostlyStaticSeparately()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldCacheMostlyStaticSeparately	(	TEXT("r.AOGlobalDistanceFieldCacheMostlyStaticSeparately")	,
		GAOGlobalDistanceFieldCacheMostlyStaticSeparately	,
		TEXT("Whether to cache mostly static primitives separately from movable primitives, which reduces global DF update cost when a movable primitive is modified. Adds another 12Mb of volume textures.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay	(	TEXT("r.AOGlobalDistanceField.CameraPositionVelocityOffsetDecay")	,
		GAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay	,
		TEXT("")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldClipmapUpdatesPerFrame()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldClipmapUpdatesPerFrame	(	TEXT("r.AOGlobalDistanceFieldClipmapUpdatesPerFrame")	,
		GAOGlobalDistanceFieldClipmapUpdatesPerFrame	,
		TEXT("How many clipmaps to update each frame. With values less than 2, the first clipmap is only updated every other frame, which can cause incorrect self occlusion during movement.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldForceFullUpdate()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldForceFullUpdate	(	TEXT("r.AOGlobalDistanceFieldForceFullUpdate")	,
		GAOGlobalDistanceFieldForceFullUpdate	,
		TEXT("Whether to force full global distance field update every frame.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldForceRecacheForStreaming()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldForceRecacheForStreaming	(	TEXT("r.AOGlobalDistanceField.ForceRecacheForStreaming")	,
		GAOGlobalDistanceFieldForceRecacheForStreaming	,
		TEXT("Useful for debugging or profiling full clipmap updates that happen when a clipmap is detected to have pending streaming.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldForceUpdateOnce()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldForceUpdateOnce	(	TEXT("r.AOGlobalDistanceFieldForceUpdateOnce")	,
		GAOGlobalDistanceFieldForceUpdateOnce	,
		TEXT("Whether to force full global distance field once.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldHeightfield()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldHeightfield	(	TEXT("r.AOGlobalDistanceField.Heightfield")	,
		GAOGlobalDistanceFieldHeightfield	,
		TEXT("Whether to voxelize Heightfield into the global distance field.\n")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels	(	TEXT("r.AOGlobalDistanceField.MinMeshSDFRadiusInVoxels")	,
		GAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels	,
		TEXT("Meshes with a smaller radius than this number of voxels are culled from the global SDF.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldMipFactor()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldMipFactor	(	TEXT("r.AOGlobalDistanceField.MipFactor")	,
		GAOGlobalDistanceFieldMipFactor	,
		TEXT("Resolution divider for the mip map of a distance field clipmap.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldNumClipmaps()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldNumClipmaps	(	TEXT("r.AOGlobalDistanceField.NumClipmaps")	,
		GAOGlobalDistanceFieldNumClipmaps	,
		TEXT("Num clipmaps in the global distance field. Setting this to anything other than 4 is currently only supported by Lumen.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldOccupancyRatio()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldOccupancyRatio	(	TEXT("r.AOGlobalDistanceField.OccupancyRatio")	,
		GGlobalDistanceFieldOccupancyRatio	,
		TEXT("Expected sparse global distacne field occupancy for the page atlas allocation. 0.25 means 25% - filled and 75% - empty.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldPartialUpdates()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldPartialUpdates	(	TEXT("r.AOGlobalDistanceFieldPartialUpdates")	,
		GAOGlobalDistanceFieldPartialUpdates	,
		TEXT("Whether to allow partial updates of the global distance field. When profiling it's useful to disable this and get the worst case composition time that happens on camera cuts.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming	(	TEXT("r.AOGlobalDistanceField.RecacheClipmapsWithPendingStreaming")	,
		GAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming	,
		TEXT("Whether to readback clipmaps cached with incomplete Mesh SDFs due to streaming and recache them on subsequent frames. Fixes innaccurate Global SDF around the camera after teleporting or loading a new level.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldRepresentHeightfields()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldRepresentHeightfields	(	TEXT("r.AOGlobalDistanceFieldRepresentHeightfields")	,
		GAOGlobalDistanceFieldRepresentHeightfields	,
		TEXT("Whether to put landscape in the global distance field. Changing this won't propagate until the global distance field gets recached (fly away and back).")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldStaggeredUpdatess()

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldStaggeredUpdatess	(	TEXT("r.AOGlobalDistanceFieldStaggeredUpdates")	,
		GAOGlobalDistanceFieldStaggeredUpdates	,
		TEXT("Whether to allow the larger clipmaps to be updated less frequently.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarAOUpdateGlobalDistanceField()

FAutoConsoleVariableRef CVarAOUpdateGlobalDistanceField	(	TEXT("r.AOUpdateGlobalDistanceField")	,
		GAOUpdateGlobalDistanceField	,
		TEXT("Whether to update the global distance field, useful for debugging.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarGlobalDistanceFieldDebugDrawModifiedPrimitives()

FAutoConsoleVariableRef CVarGlobalDistanceFieldDebugDrawModifiedPrimitives	(	TEXT("r.GlobalDistanceField.Debug.DrawModifiedPrimitives")	,
		GGlobalDistanceFieldDebugDrawModifiedPrimitives	,
		TEXT("This can be useful for tracking down why updating the global distance field is always costing a lot, since it should be mostly cached.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarGlobalDistanceFieldDebugForceMovementUpdate()

FAutoConsoleVariableRef CVarGlobalDistanceFieldDebugForceMovementUpdate	(	TEXT("r.GlobalDistanceField.Debug.ForceMovementUpdate")	,
		GGlobalDistanceFieldDebugForceMovementUpdate	,
		TEXT("Whether to force N texel border on X, Y and Z update each frame.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarGlobalDistanceFieldDebugLogModifiedPrimitives()

FAutoConsoleVariableRef CVarGlobalDistanceFieldDebugLogModifiedPrimitives	(	TEXT("r.GlobalDistanceField.Debug.LogModifiedPrimitives")	,
		GGlobalDistanceFieldDebugLogModifiedPrimitives	,
		TEXT("Pass 2 to log only non movable object updates.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarGlobalDistanceFieldHeightFieldThicknessScale()

FAutoConsoleVariableRef CVarGlobalDistanceFieldHeightFieldThicknessScale	(	TEXT("r.GlobalDistanceFieldHeightFieldThicknessScale")	,
		GGlobalDistanceFieldHeightFieldThicknessScale	,
		TEXT("Thickness of the height field when it's entered into the global distance field, measured in distance field voxels. Defaults to 4 which means 4x the voxel size as thickness.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenSceneGlobalSDFCoveredExpandSurfaceScale()

FAutoConsoleVariableRef CVarLumenSceneGlobalSDFCoveredExpandSurfaceScale	(	TEXT("r.LumenScene.GlobalSDF.CoveredExpandSurfaceScale")	,
		GLumenSceneGlobalSDFCoveredExpandSurfaceScale	,
		TEXT("Scales the half voxel SDF expand used by the Global SDF to reconstruct surfaces that are thinner than the distance between two voxels, erring on the side of over-occlusion.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenSceneGlobalSDFDitheredTransparencyStepThreshold()

FAutoConsoleVariableRef CVarLumenSceneGlobalSDFDitheredTransparencyStepThreshold	(	TEXT("r.LumenScene.GlobalSDF.DitheredTransparencyStepThreshold")	,
		GLumenSceneGlobalSDFDitheredTransparencyStepThreshold	,
		TEXT("Per-step stochastic semi-transparency threshold, for tracing users that have dithered transparency enabled, for regions of space that only contain Two Sided Mesh SDFs.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenSceneGlobalSDFDitheredTransparencyTraceThreshold()

FAutoConsoleVariableRef CVarLumenSceneGlobalSDFDitheredTransparencyTraceThreshold	(	TEXT("r.LumenScene.GlobalSDF.DitheredTransparencyTraceThreshold")	,
		GLumenSceneGlobalSDFDitheredTransparencyTraceThreshold	,
		TEXT("Per-trace stochastic semi-transparency threshold, for tracing users that have dithered transparency enabled, for regions of space that only contain Two Sided Mesh SDFs. Anything less than 1 causes leaking.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenSceneGlobalSDFSimpleCoverageBasedExpand()

FAutoConsoleVariableRef CVarLumenSceneGlobalSDFSimpleCoverageBasedExpand	(	TEXT("r.LumenScene.GlobalSDF.SimpleCoverageBasedExpand")	,
		GLumenSceneGlobalSDFSimpleCoverageBasedExpand	,
		TEXT("Whether to use simple coverage based surface expansion. Less accurate but does not sample the coverage texture.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenScenGlobalSDFNotCoveredExpandSurfaceScale()

FAutoConsoleVariableRef CVarLumenScenGlobalSDFNotCoveredExpandSurfaceScale	(	TEXT("r.LumenScene.GlobalSDF.NotCoveredExpandSurfaceScale")	,
		GLumenSceneGlobalSDFNotCoveredExpandSurfaceScale	,
		TEXT("Scales the half voxel SDF expand used by the Global SDF to reconstruct surfaces that are thinner than the distance between two voxels, for regions of space that only contain Two Sided Mesh SDFs.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

CVarLumenScenGlobalSDFNotCoveredMinStepScale()

FAutoConsoleVariableRef CVarLumenScenGlobalSDFNotCoveredMinStepScale	(	TEXT("r.LumenScene.GlobalSDF.NotCoveredMinStepScale")	,
		GLumenSceneGlobalSDFNotCoveredMinStepScale	,
		TEXT("Scales the min step size to improve performance, for regions of space that only contain Two Sided Mesh SDFs.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

DECLARE_GPU_STAT()

DECLARE_GPU_STAT

(

GlobalDistanceFieldUpdate

)

GetGlobalDistanceFieldViewOrigin()

FVector GetGlobalDistanceFieldViewOrigin	(	const FViewInfo &	View,
		int32	ClipmapIndex,
		bool	bLumenEnabled
	)

GetMinMeshSDFRadius()

float GetMinMeshSDFRadius

(

float

VoxelWorldSize

)

GetNumClipmapUpdatesPerFrame()

int32 GetNumClipmapUpdatesPerFrame

(

)

GetRecaptureReasonString()

const TCHAR * GetRecaptureReasonString

(

EGlobalSDFFullRecaptureReason

Reason

)

IMPLEMENT_GLOBAL_SHADER() [1/14]

IMPLEMENT_GLOBAL_SHADER	(	FAllocatePagesCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"AllocatePagesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [2/14]

IMPLEMENT_GLOBAL_SHADER	(	FBuildGridTilesCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"BuildGridTilesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [3/14]

IMPLEMENT_GLOBAL_SHADER	(	FClearIndirectArgBufferCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"ClearIndirectArgBufferCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [4/14]

IMPLEMENT_GLOBAL_SHADER	(	FCompositeObjectsIntoObjectGridPagesCS	,
		"/Engine/Private/DistanceField/GlobalDistanceFieldCompositeObjects.usf"	,
		"CompositeObjectsIntoObjectGridPagesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [5/14]

IMPLEMENT_GLOBAL_SHADER	(	FCompositeObjectsIntoPagesCS	,
		"/Engine/Private/DistanceField/GlobalDistanceFieldCompositeObjects.usf"	,
		"CompositeObjectsIntoPagesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [6/14]

IMPLEMENT_GLOBAL_SHADER	(	FCullObjectsToClipmapCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"CullObjectsToClipmapCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [7/14]

IMPLEMENT_GLOBAL_SHADER	(	FCullObjectsToGridCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"CullObjectsToGridCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [8/14]

IMPLEMENT_GLOBAL_SHADER	(	FGlobalDistanceFieldAccumulateUpdatedPagesCS	,
		"/Engine/Private/DistanceField/GlobalDistanceFieldDebug.usf"	,
		"GlobalDistanceFieldAccumulateUpdatedPagesCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [9/14]

IMPLEMENT_GLOBAL_SHADER	(	FGlobalDistanceFieldDebugCS	,
		"/Engine/Private/DistanceField/GlobalDistanceFieldDebug.usf"	,
		"GlobalDistanceFieldDebugCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [10/14]

IMPLEMENT_GLOBAL_SHADER	(	FGlobalDistanceFieldPageStatsCS	,
		"/Engine/Private/DistanceField/GlobalDistanceFieldDebug.usf"	,
		"GlobalDistanceFieldPageStatsCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [11/14]

IMPLEMENT_GLOBAL_SHADER	(	FInitPageFreeListCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"InitPageFreeListCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [12/14]

IMPLEMENT_GLOBAL_SHADER	(	FPageFreeListReturnCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"PageFreeListReturnCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [13/14]

IMPLEMENT_GLOBAL_SHADER	(	FPageFreeListReturnIndirectArgBufferCS	,
		"/Engine/Private/DistanceField/GlobalDistanceField.usf"	,
		"PageFreeListReturnIndirectArgBufferCS"	,
		SF_Compute
	)

IMPLEMENT_GLOBAL_SHADER() [14/14]

IMPLEMENT_GLOBAL_SHADER	(	FPropagateMipDistanceCS	,
		"/Engine/Private/DistanceField/GlobalDistanceFieldMip.usf"	,
		"PropagateMipDistanceCS"	,
		SF_Compute
	)

ReadbackDistanceFieldClipmap()

void ReadbackDistanceFieldClipmap	(	FRHICommandListImmediate &	RHICmdList,
		FGlobalDistanceFieldInfo &	GlobalDistanceFieldInfo
	)

RequestGlobalDistanceFieldReadback()

void RequestGlobalDistanceFieldReadback

(

FGlobalDistanceFieldReadback *

Readback

)

Retrieves the GPU data of a global distance field clipmap for access by the CPU

Note

: Currently only works with the highest res clipmap on the first updated view in the frame

RequestGlobalDistanceFieldReadback_GameThread()

void RequestGlobalDistanceFieldReadback_GameThread

(

FGlobalDistanceFieldReadback *

Readback

)

SetupGlobalDistanceFieldParameters()

FGlobalDistanceFieldParameters2 SetupGlobalDistanceFieldParameters

(

const FGlobalDistanceFieldParameterData &

ParameterData

)

UpdateGlobalDistanceFieldCache()

void UpdateGlobalDistanceFieldCache	(	FRDGBuilder &	GraphBuilder,
		FViewInfo &	View,
		FScene *	Scene,
		int32	CacheType,
		TArray< FGlobalDistanceFieldClipmap > &	Clipmaps,
		FRDGBufferRef	PageStatsBuffer,
		FRDGBufferRef	PageObjectGridBuffer,
		FRDGTextureRef	PageTableLayerTexture,
		FRDGTextureRef	ParentPageTableLayerTexture,
		FRDGTextureRef	PageTableCombinedTexture,
		FRDGTextureRef	PageAtlasTexture,
		FRDGTextureRef	CoverageAtlasTexture,
		FRDGTextureRef	MipTexture,
		FRDGBufferRef	PageFreeListAllocatorBuffer,
		FRDGBufferRef	PageFreeListBuffer,
		bool	bLumenEnabled
	)

Shader logic for updating modified Global Distance Field regions. Dispatches are done per clipmap in order to overlap as much work as possible.

UpdateGlobalDistanceFieldVolume()

void UpdateGlobalDistanceFieldVolume	(	FRDGBuilder &	GraphBuilder,
		FRDGExternalAccessQueue &	ExternalAccessQueue,
		FViewInfo &	View,
		FScene *	Scene,
		float	MaxOcclusionDistance,
		bool	bLumenEnabled,
		FGlobalDistanceFieldInfo &	GlobalDistanceFieldInfo
	)

Updates the global distance field for a view.
Typically issues updates for just the newly exposed regions of the volume due to camera movement. In the worst case of a camera cut or large distance field scene changes, a full update of the global distance field will be done.

UseGlobalDistanceField() [1/2]

bool UseGlobalDistanceField

(

)

UseGlobalDistanceField() [2/2]

bool UseGlobalDistanceField

(

const FDistanceFieldAOParameters &

Parameters

)

Variable Documentation

CVarAOGlobalDistanceFieldFastCameraMode

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldFastCameraMode(TEXT("r.AOGlobalDistanceField.FastCameraMode"), GAOGlobalDistanceFieldFastCameraMode, TEXT("Whether to update the Global SDF for fast camera movement - lower quality, faster updates so lighting can keep up with the camera."), ECVF_RenderThreadSafe)	(	TEXT("r.AOGlobalDistanceField.FastCameraMode")	,
		GAOGlobalDistanceFieldFastCameraMode	,
		TEXT("Whether to update the Global SDF for fast camera movement - lower quality, faster updates so lighting can keep up with the camera.")	,
		ECVF_RenderThreadSafe
	)

CVarAOGlobalDistanceFieldMinMeshSDFRadius

FAutoConsoleVariableRef CVarAOGlobalDistanceFieldMinMeshSDFRadius(TEXT("r.AOGlobalDistanceField.MinMeshSDFRadius"), GAOGlobalDistanceFieldMinMeshSDFRadius, TEXT("Meshes with a smaller world space radius than this are culled from the global SDF."), ECVF_RenderThreadSafe)	(	TEXT("r.AOGlobalDistanceField.MinMeshSDFRadius")	,
		GAOGlobalDistanceFieldMinMeshSDFRadius	,
		TEXT("Meshes with a smaller world space radius than this are culled from the global SDF.")	,
		ECVF_RenderThreadSafe
	)

CVarGlobalDistanceFieldDebugShowStats

TAutoConsoleVariable< bool > CVarGlobalDistanceFieldDebugShowStats(TEXT("r.GlobalDistanceField.Debug.ShowStats"), 0, TEXT("Debug drawing for the Global Distance Field."), ECVF_Scalability|ECVF_RenderThreadSafe)	(	TEXT("r.GlobalDistanceField.Debug.ShowStats")	,
		0	,
		TEXT("Debug drawing for the Global Distance Field.")	,
		ECVF_Scalability|	ECVF_RenderThreadSafe
	)

GAOGlobalDFClipmapDistanceExponent

float GAOGlobalDFClipmapDistanceExponent = 2

GAOGlobalDFResolution

int32 GAOGlobalDFResolution = 128

GAOGlobalDFStartDistance

float GAOGlobalDFStartDistance = 100

GAOGlobalDistanceField

int32 GAOGlobalDistanceField = 1

GAOGlobalDistanceFieldCacheMostlyStaticSeparately

int32 GAOGlobalDistanceFieldCacheMostlyStaticSeparately = 1

GAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay

float GAOGlobalDistanceFieldCameraPositionVelocityOffsetDecay = .7f

GAOGlobalDistanceFieldClipmapUpdatesPerFrame

int32 GAOGlobalDistanceFieldClipmapUpdatesPerFrame = 2

GAOGlobalDistanceFieldFastCameraMode

int32 GAOGlobalDistanceFieldFastCameraMode = 0

GAOGlobalDistanceFieldForceFullUpdate

int32 GAOGlobalDistanceFieldForceFullUpdate = 0

GAOGlobalDistanceFieldForceRecacheForStreaming

int32 GAOGlobalDistanceFieldForceRecacheForStreaming = 0

GAOGlobalDistanceFieldForceUpdateOnce

int32 GAOGlobalDistanceFieldForceUpdateOnce = 0

GAOGlobalDistanceFieldHeightfield

int32 GAOGlobalDistanceFieldHeightfield = 1

GAOGlobalDistanceFieldMinMeshSDFRadius

float GAOGlobalDistanceFieldMinMeshSDFRadius = 20

GAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels

float GAOGlobalDistanceFieldMinMeshSDFRadiusInVoxels = .5f

GAOGlobalDistanceFieldMipFactor

int32 GAOGlobalDistanceFieldMipFactor = 4

GAOGlobalDistanceFieldNumClipmaps

int32 GAOGlobalDistanceFieldNumClipmaps = 4

GAOGlobalDistanceFieldPartialUpdates

int32 GAOGlobalDistanceFieldPartialUpdates = 1

GAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming

int32 GAOGlobalDistanceFieldRecacheClipmapsWithPendingStreaming = 1

GAOGlobalDistanceFieldRepresentHeightfields

int32 GAOGlobalDistanceFieldRepresentHeightfields = 1

GAOGlobalDistanceFieldStaggeredUpdates

int32 GAOGlobalDistanceFieldStaggeredUpdates = 1

GAOUpdateGlobalDistanceField

int32 GAOUpdateGlobalDistanceField = 1

GDistanceFieldOffsetDataStructure

int32 GDistanceFieldOffsetDataStructure

extern

GGlobalDistanceFieldCoveragePageResolutionInAtlas

const int32 GGlobalDistanceFieldCoveragePageResolutionInAtlas = 4

GGlobalDistanceFieldDebugDrawModifiedPrimitives

int32 GGlobalDistanceFieldDebugDrawModifiedPrimitives = 0

GGlobalDistanceFieldDebugForceMovementUpdate

int32 GGlobalDistanceFieldDebugForceMovementUpdate = 0

GGlobalDistanceFieldDebugLogModifiedPrimitives

int32 GGlobalDistanceFieldDebugLogModifiedPrimitives = 0

GGlobalDistanceFieldHeightFieldThicknessScale

float GGlobalDistanceFieldHeightFieldThicknessScale = 4.0f

GGlobalDistanceFieldInfluenceRangeInVoxels

const int32 GGlobalDistanceFieldInfluenceRangeInVoxels = 4

GGlobalDistanceFieldOccupancyRatio

float GGlobalDistanceFieldOccupancyRatio = 0.3f

GGlobalDistanceFieldPageResolution

const int32 GGlobalDistanceFieldPageResolution = GGlobalDistanceFieldPageResolutionInAtlas - 1

GGlobalDistanceFieldPageResolutionInAtlas

const int32 GGlobalDistanceFieldPageResolutionInAtlas = 8

GLumenSceneGlobalSDFCoveredExpandSurfaceScale

float GLumenSceneGlobalSDFCoveredExpandSurfaceScale = 1.0f

GLumenSceneGlobalSDFDitheredTransparencyStepThreshold

float GLumenSceneGlobalSDFDitheredTransparencyStepThreshold = .5f

GLumenSceneGlobalSDFDitheredTransparencyTraceThreshold

float GLumenSceneGlobalSDFDitheredTransparencyTraceThreshold = .9f

GLumenSceneGlobalSDFNotCoveredExpandSurfaceScale

float GLumenSceneGlobalSDFNotCoveredExpandSurfaceScale = .6f

GLumenSceneGlobalSDFNotCoveredMinStepScale

float GLumenSceneGlobalSDFNotCoveredMinStepScale = 4.0f

GLumenSceneGlobalSDFSimpleCoverageBasedExpand

int32 GLumenSceneGlobalSDFSimpleCoverageBasedExpand = 0