title: iOS simulator issue with SceneKit displays only black shapes
body: <p>I have developed a small dice rolling app using SceneKit. While everything works correctly on device my dice nodes are shown as black shapes in the simulator. This used to work fine before but I stopped working on the app for a year and Xcode updated since. You can find screenshots of the issue below.</p>
  
  <p>I tried using an other version of Xcode (11 beta). I tried deleting everything Xcode and Simulator related and reinstalling. I tried disabling every fancy effect on my dice nodes but nothing seems to have an impact, the issue really seems to come from the simulator rendering. </p>
  
  <p>As anyone ever encountered a similar issue? Any help on how to fix it would be appreciated as I use Fastlane Snapshot to generate new screenshots when I release. </p>
  
  <p>Simulator Screenshot:</p>
  
  <p><a href="https://i.stack.imgur.com/e3S1V.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/e3S1V.png" alt="enter image description here"></a></p>
  
  <p>Device Screenshot:</p>
  
  <p><a href="https://i.stack.imgur.com/ALLBD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ALLBD.png" alt="enter image description here"></a> </p>