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> Unreal Engine API Reference > Runtime > DatasmithCore > IDatasmithMaterialExpression

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IDatasmithMaterialExpression

Base class for representing an expression in the material graph of a IDatasmithUEPbrMaterial.

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Inheritance Hierarchy

ISceneGraphNode

IDatasmithElement

IDatasmithMaterialExpression

IDatasmithExpressionParameter

	IDatasmithMaterialExpressionBool
	IDatasmithMaterialExpressionColor
	IDatasmithMaterialExpressionScalar
	IDatasmithMaterialExpressionTexture

IDatasmithMaterialExpressionCustom

IDatasmithMaterialExpressionFlattenNormal

IDatasmithMaterialExpressionFunctionCall

IDatasmithMaterialExpressionGeneric

IDatasmithMaterialExpressionTextureCoordinate

References

Module	DatasmithCore
Header	/Engine/Source/Runtime/Datasmith/DatasmithCore/Public/DatasmithMaterialElements.h
Include	#include "DatasmithMaterialElements.h"

Syntax

class IDatasmithMaterialExpression : public IDatasmithElement

Remarks

Base class for representing an expression in the material graph of a IDatasmithUEPbrMaterial. Setting a name to the expression is optional but allows to automatically create material instances during the import, which is faster and more optimal.

Destructors

	Name	Description
	~IDatasmithMaterialExpression()

Functions

	Name	Description
void	ConnectExpression ( IDatasmithExpressionInput& Express... )	Connects the default output to an expression input
void	ConnectExpression ( IDatasmithExpressionInput& Express..., int32 OutputIndex )	Connects a specific output to an expression input
int32	GetDefaultOutputIndex()	The output index to use by default for this expression when connecting it to other inputs.
EDatasmithMa...	GetExpressionType()
IDatasmithEx...	GetInput ( int32 Index )
const IDatas...	GetInput ( int32 Index )
int32	GetInputCount()
bool	IsSubType ( const EDatasmithMaterialExpressionT... )
void	ResetExpression()	Reset the expression to its default values, and disconnect input expressions
void	SetDefaultOutputIndex ( int32 OutputIndex )

Deprecated Functions

		Name	Description
	EDatasmithMa...	GetType()	Deprecated, please use GetExpressionType() instead
	bool	IsA ( const EDatasmithMaterialExpressionT... )	IDatasmithMaterialExpression now derive from IDatasmithElement, please use IsSubType() or GetExpressionType() instead