If parent Node will be moved, childnodes will followed.

I did. But when I use hitTest.first.node, the childnode will be touch, not all parts of the object.

Can you look at my code?

Here is my code when touching:

       let location = recognizer.location(in: sceneView)
        var hitTestOptions = [SCNHitTestOption: Any]()
        hitTestOptions[SCNHitTestOption.boundingBoxOnly] = true
        let hit=sceneView.hitTest(location, options: hitTestOptions).first
            print("You're dragging")
            guard let selectedNode=(hit?.node) as SCNNode? else { return }
            let transform = arHitTestResult.last?.worldTransform
            let newPosition = float3((transform?.columns.3.x)!, ((transform?.columns.3.y)!), (transform?.columns.3.z)!)
            selectedNode.simdPosition = newPosition
            sceneView.scene.rootNode.addChildNode(selectedNode)
        

I did it. Thank you so much.