SWIFT / SCENEKIT: A SCNNODE removes itself after

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// Die SCNNODE entfernt sich nach Zeit selber aus dem Scenegraph

// Ich hoffe SWIFT´s  removeFromParentNode() räumt selber vernünftig auf...

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let waitaction   = SCNAction.wait(duration: TimeInterval(<lifetime>))

let removeaction = SCNAction.removeFromParentNode()

let sequence     = SCNAction.sequence([waitaction, removeaction])

<SCNNODE>.runAction(sequence)