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GetScreenColorXY not giving color result, just black, BUG?

Hi there, i'm using UColorsBlueprintFunctionLibrary::GetScreenColorXY, compiling it without problem and adding a 2d vector from blueprint to move the pixels coordinates to be able to read pixel colors. It will allways give me black pixel color as a result. (though alpha is allways 1)

Any idea? Is it a bug? I'm not able to find or to think about any reason for this.

Here i copy my code and a screenshot of my blueprint.

In my build.css:

     PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "ApplicationCore" });

In my .h:

 #include "CoreMinimal.h"
  #include "Kismet/BlueprintFunctionLibrary.h"
  #include "ColorsBlueprintFunctionLibrary.generated.h"

         UFUNCTION(BlueprintCallable, Category = "Colors")
         static FLinearColor GetScreenColorXY(FVector2D InScreenPos, float InGamma);

In my cpp:

 #include "GenericPlatformApplicationMisc.h"

 FLinearColor UColorsBlueprintFunctionLibrary::GetScreenColorXY(FVector2D InScreenPos, float InGamma)
     return FGenericPlatformApplicationMisc::GetScreenPixelColor(InScreenPos, InGamma);

And finaly in my blueprint i'm trying to use the function "Get Screen Color XY" in construction scritp

alt text

Debug on editor (in the picture i changed the name of the values, not a mistake there)

alt text

Product Version: UE 4.18
blueprintdebug.jpg (195.8 kB)
coloranalisys.jpg (106.2 kB)
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asked Jun 08 '18 at 02:53 AM in C++ Programming

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