title: Scaling a SCNNode in ARKit
body: <p>I am trying to scale a 3D model of a chair in ARKit using SceneKit. Here is my code for the pinch gesture: </p>
  
  <pre><code> @objc func pinched(recognizer :UIPinchGestureRecognizer) {
  
          var deltaScale :CGFloat = 0.0
  
          deltaScale = 1 - self.lastScale - recognizer.scale
  
          print(recognizer.scale)
  
          let sceneView = recognizer.view as! ARSCNView
          let touchPoint = recognizer.location(in: sceneView)
  
          let scnHitTestResults = self.sceneView.hitTest(touchPoint, options: nil)
  
          if let hitTestResult = scnHitTestResults.first {
  
              let chairNode = hitTestResult.node
  
              chairNode.scale = SCNVector3(deltaScale,deltaScale,deltaScale)
              self.lastScale = recognizer.scale
  
          }
  
      }
  </code></pre>
  
  <p>It does scale but for some weird reason it inverts the 3D model upside down. Any ideas why? Also although the scaling works but it is not as smooth and kinda jumps from different scale factors when used in multiple progressions using pinch to zoom. </p>