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  3. FImportanceTexture

FImportanceTexture

Texture processed for importance sampling Holds marginal PDF of the rows, as well as the PDF of each row

API > API/Runtime > API/Runtime/Engine

Texture processed for importance sampling Holds marginal PDF of the rows, as well as the PDF of each row

   
Name FImportanceTexture
Type struct
Header File /Engine/Source/Runtime/Engine/Classes/Kismet/ImportanceSamplingLibrary.h
Include Path #include "Kismet/ImportanceSamplingLibrary.h"

Syntax

USTRUCT (BlueprintType ,  
        Meta=(HasNativeMake="/Script/Engine.ImportanceSamplingLibrary.MakeImportanceTexture", HasNativeBreak="/Script/Engine.ImportanceSamplingLibrary.BreakImportanceTexture"))  
struct FImportanceTexture

Constructors

Name Remarks Include Path Unreal Specifiers
Default constructor, must Initialize before use Kismet/ImportanceSamplingLibrary.h  
  Kismet/ImportanceSamplingLibrary.h  
  Kismet/ImportanceSamplingLibrary.h  

FImportanceTexture ( UTexture2D* SourceTexture,
TEnumAsByte< EImportanceWeight::Type > WeightingFunc
)

 Constructor with initialization Kismet/ImportanceSamplingLibrary.h  

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
ConditionalCDF TArray< float > Unnormalized cumulative probability of each pixel in a row (Size.Y row CDFs of Size.X+1) First entry of each row is zero, final entry in each row is the CDF normalization factor for that row Kismet/ImportanceSamplingLibrary.h  
LinearTextureData TArray< FLinearColor > Packed copy of MIP level data for filtered sampling (capped to 1024x1024) local copy seems better than allocating and copying the same data temporarily for each sample Kismet/ImportanceSamplingLibrary.h
  • Transient
MarginalCDF TArray< float > Unnormalized cumulative density of the image by rows (Size.Y+1) First entry is zero, final entry is the CDF normalization factor Kismet/ImportanceSamplingLibrary.h  
NumMips int Active number of MIP levels Kismet/ImportanceSamplingLibrary.h  
Size FIntPoint Active texture dimensions, capped to 1024 x 1024 Kismet/ImportanceSamplingLibrary.h  
Texture TWeakObjectPtr< UTexture2D > Original texture object for Break function. Kismet/ImportanceSamplingLibrary.h  
Weighting TEnumAsByte< EImportanceWeight::Type > Original importance weight for Break function. Kismet/ImportanceSamplingLibrary.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

FLinearColor GetColorBilinear ( FVector2D Position,
int32 Mip
) const

 Return color of texel at given MIP level, clamped to available Mip levels Kismet/ImportanceSamplingLibrary.h  

FLinearColor GetColorTrilinear ( FVector2D Position,
float Mip
) const

 Return color interpolated between MIP levels Kismet/ImportanceSamplingLibrary.h  

void ImportanceSample ( const FVector2D& Rand,
int Samples,
float Intensity,
FVector2D& SamplePosition,
FLinearColor& SampleColor,
float& SampleIntensity,
float& SampleSize
) const

 Distribute sample points proportional to Texture2D luminance. Kismet/ImportanceSamplingLibrary.h  

float ImportanceWeight ( FColor Texel,
TEnumAsByte< EImportanceWeight::Type > WeightingFunc
) const

 Importance probability weight for given texel Kismet/ImportanceSamplingLibrary.h  

void Initialize ( UTexture2D* SourceTexture,
TEnumAsByte< EImportanceWeight::Type > WeightingFunc
)

 Allocate and compute PDF arrays for a texture Kismet/ImportanceSamplingLibrary.h  

Operators

Name Remarks Include Path Unreal Specifiers
  Kismet/ImportanceSamplingLibrary.h  
  Kismet/ImportanceSamplingLibrary.h  

Deprecated Variables

Name Type Remarks Include Path Unreal Specifiers
TextureData_DEPRECATED TArray< FColor >   Kismet/ImportanceSamplingLibrary.h
  • Transient
  • Meta=(DeprecatedProperty, DeprecationMessage="Please use LinearTextureData instead.")

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