UNiagaraDataInterfaceVelocityGrid | Unreal Engine 4.27 Documentation

Unreal Engine C++ API Reference > Plugins > HairStrandsCore > Niagara

Inheritance Hierarchy

References


Module	HairStrandsCore
Header	/Engine/Plugins/Runtime/HairStrands/Source/HairStrandsCore/Public/Niagara/NiagaraDataInterfaceVelocityGrid.h
Include	#include "Niagara/NiagaraDataInterfaceVelocityGrid.h"

Syntax

UCLASS&40;EditInlineNew, Category&61;"Grid", Meta&61;&40;DisplayName&61;"Velocity Grid"&41;&41;  
class UNiagaraDataInterfaceVelocityGrid : public UNiagaraDataInterfaceRWBase

Remarks

Data Interface for the strand base

Variables

	Type	Name	Description
	FIntVector	GridSize	Grid size along the X axis.
	int32	NumAttributes	Num Attributes

Constructors

	Type	Name	Description
		UNiagaraDataInterfaceVelocityGrid ( const FObjectInitializer& ObjectInitializer )

Functions

Type	Name	Description
void	BuildVelocityField ( FVectorVMExternalFunctionContext& Context )	Build the velocity field
void	ComputeGridSize ( FVectorVMExternalFunctionContext& Context )	Compute the grid Size (Origin and length)
void	SampleVelocityField ( FVectorVMExternalFunctionContext& Context )	Sample the grid
void	SetGridDimension ( FVectorVMExternalFunctionContext& Context )	Set the grid dimension
void	UpdateGridTransform ( FVectorVMExternalFunctionContext& Context )	Update the grid transform

Overridden from UNiagaraDataInterface

Type	Name	Description
bool	AppendCompileHash ( FNiagaraCompileHashVisitor* InVisitor )	GPU simulation functionality
bool	CanExecuteOnTarget ( ENiagaraSimTarget Target )
bool	CopyToInternal ( UNiagaraDataInterface* Destination )	Copy one niagara DI to this
void	DestroyPerInstanceData ( void* PerInstanceData, FNiagaraSystemInstance* SystemInstance )	Destroys the per instance data for this interface.
bool	Equals ( const UNiagaraDataInterface* Other )	Determines if this DataInterface is the same as another.
void	GetCommonHLSL ( FString& OutHLSL )	Allows data interfaces to provide common functionality that will be shared across interfaces on that type.
bool	GetFunctionHLSL ( const FNiagaraDataInterfaceGPUParamInfo& ParamInfo, const FNiagaraDataInterfaceGeneratedFunction& FunctionInfo, int FunctionInstanceIndex, FString& OutHLSL )
void	GetFunctions ( TArray< FNiagaraFunctionSignature >& OutFunctions )	UNiagaraDataInterface Interface
void	GetParameterDefinitionHLSL ( const FNiagaraDataInterfaceGPUParamInfo& ParamInfo, FString& OutHLSL )
void	GetVMExternalFunction ( const FVMExternalFunctionBindingInfo& BindingInfo, void* InstanceData, FVMExternalFunction& OutFunc )	Returns the delegate for the passed function signature.
bool	InitPerInstanceData ( void* PerInstanceData, FNiagaraSystemInstance* SystemInstance )	Initializes the per instance data for this interface.
int32	PerInstanceDataSize ()	Returns the size of the per instance data for this interface.
bool	PerInstanceTick ( void* PerInstanceData, FNiagaraSystemInstance* SystemInstance, float DeltaSeconds )	Ticks the per instance data for this interface, if it has any.
void	ProvidePerInstanceDataForRenderThread ( void* DataForRenderThread, void* PerInstanceData, const FNiagaraSystemInstanceID& SystemInstance )	Subclasses that wish to work with GPU systems/emitters must implement this.
void	SetShaderParameters ( const FNiagaraDataInterfaceSetShaderParametersContext& Context )	Set the shader parameters will only be called if the data interface provided shader parameters.

Overridden from UNiagaraDataInterfaceBase

	Type	Name	Description
	void	BuildShaderParameters ( FNiagaraShaderParametersBuilder& ShaderParametersBuilder )	Override this method to provide parameters to the GPU (SRV / UAV / Constants / etc) The most common usage will be to provide a single structure which is nested with other parameters.