title: iOS 12 and SceneKit: Node showing up in White
body: <p>The application we had have been using SceneKit for a while and never had any issues with it until recently. Compared to earlier, now the render doesnt show the node in there actual color. Please see the images attached for more detail. If anyone has a solution to it then I would highly appreciate it.</p>
  
  <p>iOS 12
  <a href="https://image.ibb.co/i9sVGp/PNG_image.png" rel="nofollow noreferrer">https://image.ibb.co/i9sVGp/PNG_image.png</a></p>
  
  <p>iOS 11
  <a href="https://image.ibb.co/bBRCU9/IMG_0145.png" rel="nofollow noreferrer">https://image.ibb.co/bBRCU9/IMG_0145.png</a></p>