static void FindChromakeyCardsForRootActor ( const [ADisplayClusterRootActor](API\Plugins\DisplayCluster\ADisplayClusterRootActor) * RootActor, [TSet](API\Runtime\Core\Containers\TSet)< [ADisplayClusterChromakeyCardActor](API\Plugins\DisplayCluster\ADisplayClusterChromakeyCardActo-) * > & OutChromakeyCards )