UTexture2D C++ sample at x,y coordinates returning incorrect RGBA values

3dRaven · January 1, 2024, 1:19am

How are you generating the texture?

I get the correct results


UTexture2D* UColorToolsBPLibrary::CreateTexture(UTextureRenderTarget2D* TextureRenderTarget) {

	// Creates Texture2D to store TextureRenderTarget content
	UTexture2D* Texture = UTexture2D::CreateTransient(TextureRenderTarget->SizeX, TextureRenderTarget->SizeY, PF_B8G8R8A8);
#if WITH_EDITORONLY_DATA
	Texture->MipGenSettings = TMGS_NoMipmaps;
#endif
	Texture->SRGB = TextureRenderTarget->SRGB;

	// Read the pixels from the RenderTarget and store them in a FColor array
	TArray<FColor> SurfData;
	FRenderTarget* RenderTarget = TextureRenderTarget->GameThread_GetRenderTargetResource();
	RenderTarget->ReadPixels(SurfData);

	// Lock and copies the data between the textures
	void* TextureData = Texture->GetPlatformData()->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
	const int32 TextureDataSize = SurfData.Num() * 4;
	FMemory::Memcpy(TextureData, SurfData.GetData(), TextureDataSize);
	Texture->GetPlatformData()->Mips[0].BulkData.Unlock();

	// Apply Texture changes to GPU memory
	Texture->UpdateResource();
	return Texture;
}

res2