FGradientStopMark ( float InTime, [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) InRedKeyHandle, [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) InGreenKeyHandle, [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) InBlueKeyHandle, [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) InAlphaKeyHandle )