UMaterialExpressionVolumetricAdvancedMaterialOutput Class Reference

Material output expression for writing advanced volumetric material properties. More...

Static Public Member Functions
Static Functions
static UClass	StaticClass ()
Static Public Member Functions inherited from UMaterialExpressionCustomOutput
static UClass	StaticClass ()
Static Public Member Functions inherited from UMaterialExpression
static UClass	StaticClass ()
Static Public Member Functions inherited from UObject
static UClass	StaticClass ()

Public Attributes
Multi-Scattering
float32	ConstMultiScatteringOcclusion
	Only used if MultiScatteringOcclusion is not hooked up. Multi-scattering approximation: represents how much occlusion will be reduced for each successive octave. Valid range is [0,1], from low to high occlusion.
float32	ConstMultiScatteringContribution
	Only used if MultiScatteringContribution is not hooked up. Multi-scattering approximation: represents how much contribution each successive octave will add. Valid range is [0,1], from low to high contribution.
float32	ConstMultiScatteringEccentricity
	Only used if MultiScatteringEccentricity is not hooked up. Multi-scattering approximation: represents how much the phase will become isotropic for each successive octave. Valid range is [0,1], from anisotropic to isotropic phase.
uint	MultiScatteringApproximationOctaveCount
	How many octave to use for the multiple-scattering approximation. This makes the shader more expensive so you should only use 0 or 1 for better performance, and tweak multiple scattering parameters accordingly. 0 means single scattering only. The maximum value is 2 (expenssive).
Options
bool	bRayMarchVolumeShadow
	Disable this to use the cloud shadow map instead of secondary raymarching. This is usually enough for clouds viewed from the ground and it result in a performance boost. Shadow now have infinite length but also becomes less accurate and gray scale.
bool	bClampMultiScatteringContribution
	Set whether multiple scattering contribution entry is clamped in [0,1] or not. When disabled, the artist is in charge for ensuring the visual remain in a reasonable brighness range.
bool	bGrayScaleMaterial
	Set this for the material to only be considered grey scale, only using the R chanel of the input parameters internally. The lighting will still be colored. This is an optimisation.
bool	bGroundContribution
	Sample the shadowed lighting contribution from the ground onto the medium (single scattering). This adds some costs to the tracing when enabled.
Phase
bool	PerSamplePhaseEvaluation
	Set this to true to force the phase function to be evaluated per sample, instead once per pixel (globally). Per sample evaluation is slower.
float32	ConstPhaseBlend
	Only used if PhaseBlend is not hooked up. Lerp factor when blending the two phase functions parameterized by G and G2. Valid range is [0,1].
float32	ConstPhaseG2
	Only used if PhaseG2 is not hooked up. Parameter 'g' input to the second phase function describing how much forward(g<0) or backward (g>0) light scatter around. Valid range is [-1,1].
float32	ConstPhaseG
	Only used if PhaseG is not hooked up. Parameter 'g' input to the phase function describing how much forward(g<0) or backward (g>0) light scatter around.
Public Attributes inherited from UMaterialExpression
int	MaterialExpressionEditorY
int	MaterialExpressionEditorX
FString	Desc
	A description that level designers can add (shows in the material editor UI).
Public Attributes inherited from UObject
const UClass	Class
const UObject	Outer
const UPackage	Outermost
const UPackage	Package
const UWorld	World
const FName	Name
const bool	IsRooted

Additional Inherited Members
Public Member Functions inherited from UObject
bool	MarkPackageDirty () const
void	RemoveFromRoot ()
bool	GetIsRooted () const
bool	IsTransient () const
bool	Modify (bool bAlwaysMarkDirty=true)
void	SetTransactional (bool bTransactional)
bool	IsSupportedForNetworking () const
UClass	GetClass () const
UObject	GetOuter () const
UObject	GetTypedOuter (TSubclassOf< UObject > Target) const
	Traverses the outer chain searching for the next object of a certain type.
UPackage	GetOutermost () const
UPackage	GetPackage () const
void	AddToRoot ()
UWorld	GetWorld () const
FName	GetName () const
FString	GetFullName (const UObject StopOuter=nullptr) const
FString	GetPathName (const UObject StopOuter=nullptr) const
bool	IsA (const UClass Class) const
	Returns true if this object is of the specified type, or a child of that type.
void	SaveConfig ()
void	LoadConfig ()
void	ReloadConfig ()
void	CopyScriptPropertiesFrom (const UObject OtherObject)
void	opCast (?&Address) const
FString	ToString () const

Detailed Description

Material output expression for writing advanced volumetric material properties.

Member Function Documentation

StaticClass()

UClass StaticClass ( )

static

Member Data Documentation

bClampMultiScatteringContribution

bool bClampMultiScatteringContribution

Set whether multiple scattering contribution entry is clamped in [0,1] or not. When disabled, the artist is in charge for ensuring the visual remain in a reasonable brighness range.

bGrayScaleMaterial

bool bGrayScaleMaterial

Set this for the material to only be considered grey scale, only using the R chanel of the input parameters internally. The lighting will still be colored. This is an optimisation.

bGroundContribution

bool bGroundContribution

Sample the shadowed lighting contribution from the ground onto the medium (single scattering). This adds some costs to the tracing when enabled.

bRayMarchVolumeShadow

bool bRayMarchVolumeShadow

Disable this to use the cloud shadow map instead of secondary raymarching. This is usually enough for clouds viewed from the ground and it result in a performance boost. Shadow now have infinite length but also becomes less accurate and gray scale.

ConstMultiScatteringContribution

float32 ConstMultiScatteringContribution

Only used if MultiScatteringContribution is not hooked up. Multi-scattering approximation: represents how much contribution each successive octave will add. Valid range is [0,1], from low to high contribution.

ConstMultiScatteringEccentricity

float32 ConstMultiScatteringEccentricity

Only used if MultiScatteringEccentricity is not hooked up. Multi-scattering approximation: represents how much the phase will become isotropic for each successive octave. Valid range is [0,1], from anisotropic to isotropic phase.

ConstMultiScatteringOcclusion

float32 ConstMultiScatteringOcclusion

Only used if MultiScatteringOcclusion is not hooked up. Multi-scattering approximation: represents how much occlusion will be reduced for each successive octave. Valid range is [0,1], from low to high occlusion.

ConstPhaseBlend

float32 ConstPhaseBlend

Only used if PhaseBlend is not hooked up. Lerp factor when blending the two phase functions parameterized by G and G2. Valid range is [0,1].

ConstPhaseG

float32 ConstPhaseG

Only used if PhaseG is not hooked up. Parameter 'g' input to the phase function describing how much forward(g<0) or backward (g>0) light scatter around.

ConstPhaseG2

float32 ConstPhaseG2

Only used if PhaseG2 is not hooked up. Parameter 'g' input to the second phase function describing how much forward(g<0) or backward (g>0) light scatter around. Valid range is [-1,1].

MultiScatteringApproximationOctaveCount

uint MultiScatteringApproximationOctaveCount

How many octave to use for the multiple-scattering approximation. This makes the shader more expensive so you should only use 0 or 1 for better performance, and tweak multiple scattering parameters accordingly. 0 means single scattering only. The maximum value is 2 (expenssive).

PerSamplePhaseEvaluation

bool PerSamplePhaseEvaluation

Set this to true to force the phase function to be evaluated per sample, instead once per pixel (globally). Per sample evaluation is slower.