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Why does the viewport depend on the method to get it ?

Hi Guys,

I am using the GetMousePos and then GetScreenPixelColor to pick up the color in a SColorSpectrum. It works very well but i have gathered 3 different methods of getting the viewport and they give very different results:

 // This one crashes the game as soon as i click the SColorSpectrum
 UGameEngine* GameEngine = Cast<UGameEngine>(GEngine);
 GameEngine->GameViewport->Viewport->GetMousePos(MousePos, false);
 // This one works only on the last client and gives random colors on server and other clients
 GEngine->GameViewport->Viewport->GetMousePos(MousePos, false);
 // This one works well everywhere
 GetWorld()->GetGameViewport()->Viewport->GetMousePos(MousePos, false);

I have no problem since the last method works all right, but i am very curious about the results of the first two methods.

Anyone would care to explain what exactly goes on in the 3 methods ?



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asked Nov 24 '14 at 06:05 AM in C++ Programming

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