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> Unreal Engine API Reference > Runtime > Engine > Materials > UMaterialExpressionVolumetricAdvancedMaterialOutput

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UMaterialExpressionVolumetricAdvancedMaterialOutput

Material output expression for writing advanced volumetric material properties.

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Inheritance Hierarchy

UObjectBase

UObjectBaseUtility

UObject

UMaterialExpression

UMaterialExpressionCustomOutput

UMaterialExpressionVolumetricAdvancedMaterialOutput

References

Module	Engine
Header	/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionVolumetricAdvancedMaterialOutput.h
Include	#include "Materials/MaterialExpressionVolumetricAdvancedMaterialOutput.h"

Syntax

class UMaterialExpressionVolumetricAdvancedMaterialOutput : public UMaterialExpressionCustomOutput

Remarks

Material output expression for writing advanced volumetric material properties.

Variables

	Name	Description
bool	bGrayScaleMaterial	Set this for the material to only be considered grey scale, only using the R chanel of the input parameters internally.
bool	bGroundContribution	Sample the shadowed lighting contribution from the ground onto the medium (single scattering).
bool	bRayMarchVolumeShadow	Disable this to use the cloud shadow map instead of secondary raymarching.
FExpressionInpu...	ConservativeDensity	This is a 3-components float vector.
float	ConstMultiScatteringContribution	Only used if MultiScatteringContribution is not hooked up.
float	ConstMultiScatteringEccentricity	Only used if MultiScatteringEccentricity is not hooked up.
float	ConstMultiScatteringOcclusion	Only used if MultiScatteringOcclusion is not hooked up.
float	ConstPhaseBlend	Only used if PhaseBlend is not hooked up.
float	ConstPhaseG	Only used if PhaseG is not hooked up.
float	ConstPhaseG2	Only used if PhaseG2 is not hooked up.
uint32	MultiScatteringApproximationOctaveCount	How many octave to use for the multiple-scattering approximation.
FExpressionInpu...	MultiScatteringContribution	Multi-scattering approximation: represents how much contribution each successive octave will add.
FExpressionInpu...	MultiScatteringEccentricity	Multi-scattering approximation: represents how much the phase will become isotropic for each successive octave.
FExpressionInpu...	MultiScatteringOcclusion	Multi-scattering approximation: represents how much occlusion will be reduced for each successive octave.
bool	PerSamplePhaseEvaluation	Set this to true to force the phase function to be evaluated per sample, instead once per pixel (globally).
FExpressionInpu...	PhaseBlend	Lerp factor when blending the two phase functions parameterized by G and G2. Valid range is [0,1].
FExpressionInpu...	PhaseG	Parameter 'g' input to the phase function describing how much forward(g<0) or backward (g>0) light scatter around.
FExpressionInpu...	PhaseG2	Parameter 'g' input to the second phase function describing how much forward(g<0) or backward (g>0) light scatter around.

Constructors

	Name	Description
	UMaterialExpressionVolumetricAdvancedMaterialOutput ( const FObjectInitializer& ObjectIn... )

Functions

		Name	Description
	bool	GetEvaluatePhaseOncePerSample()
	uint32	GetMultiScatteringApproximationOctaveCount()

Overridden from UMaterialExpressionCustomOutput

	Name	Description
FString	GetDisplayName()
FString	GetFunctionName()
int32	GetNumOutputs()	Override to enable multiple outputs.

Overridden from UMaterialExpression

		Name	Description
	int32	Compile ( FMaterialCompiler* Compiler, int32 OutputIndex )	Create the new shader code chunk needed for the Abs expression
	void	GetCaption ( TArray< FString >& OutCaptions )	Returns the text to display on the material expression (in the material editor).

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