UKismetRenderingLibrary::ReadRenderTargetRawPixel

function Engine Blueprint Since unknown

#include "Kismet/KismetRenderingLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintCallable

Description

Reads a single pixel from a render target as-is (no sRGB conversion) at an integer pixel coordinate, returning the raw linear value.

Caveats & Gotchas

• Incredibly inefficient and slow — this stalls the render thread to read back GPU memory one pixel at a time. Never call in a loop or per-frame on anything performance sensitive.
• Unlike ReadRenderTargetPixel, this does not assume sRGB space for LDR targets — it returns the raw stored value, which matters for HDR/linear formats like RTF_RGBA16f.
• bNormalize only affects normalized 8-bit formats; it has no effect on floating point render target formats.

Signature

static FLinearColor ReadRenderTargetRawPixel(UObject* WorldContextObject, UTextureRenderTarget2D* TextureRenderTarget, int32 X, int32 Y, bool bNormalize = true)

Parameters

Name	Type	Description	Default
WorldContextObject	UObject*	World context used to resolve the current world.	—
TextureRenderTarget	UTextureRenderTarget2D*	The render target to read from.	—
X	int32	Integer pixel X coordinate to sample.	—
Y	int32	Integer pixel Y coordinate to sample.	—
bNormalize	bool	Whether to normalize 8-bit formats into the [0,1] range.	true

Return Type

FLinearColor

Example

Sample a raw pixel value C++

FLinearColor RawValue = UKismetRenderingLibrary::ReadRenderTargetRawPixel(this, HeightmapRT, 128, 128);
float Height = RawValue.R;

Version History

Introduced in: unknown

Version	Status	Notes
5.6	stable	—

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