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I'm trying to optimize the draw calls in an existing scene with flattenedClone(). From what I can tell enumerateChildNodes would be a good way to go through the scene tree and add the nodes to be flattened to a parent node. I saw something like this in a tutorial but it is saying that 'withName' is an extra argument. gameScene.rootNode.enumerateChildNodes(withName: "//*"){ (node, stop) in   if (node.name == "Large Tree"){         flattenParent.addChildNode(node)         node.removeFromParentNode()    }          } any guidance on this usage? Also would a switch statement or multiple || be optimal when searching through several different mesh nodes?