title: iOS 12 Model rendering issue
body: <p>Having an iOS 12 model rending issue.</p>
  
  <p>My app loads OBJ models with associated MTLs and textures.</p>
  
  <p>On iOS 11 we were able to load up the models and they looked good:</p>
  
  <p><a href="https://i.stack.imgur.com/n2HSo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/n2HSo.png" alt="iOS 11 - models look good"></a></p>
  
  <p>On iOS 12, they look completely different:</p>
  
  <p><a href="https://i.stack.imgur.com/JjXxz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JjXxz.png" alt="iOS 12 - models look bad"></a></p>
  
  <p>We are able to make some changes after the model loads initially to make it look good, but it takes time for the iPhone to load the better looking version.</p>
  
  <p>Has anyone heard about/experienced this issue and know what has changed in iOS 12 (and potentially MacOS Mojave) that is causing it?</p>
  
  <p>There might be two issues: 1- texture issue (as seen in chair on left) and 2- Material/MTL issue as seen in the ‘delivery drone’ on the right</p>
  
  <p>I don't have any code at this moment as I am not one of the developers on the project - I have been tasked with reaching out here. If you have any questions regarding the specific code I could definitely try to get some to show here. It seems to me like this might not be a code issue or bug, but rather some settings that have to changed due to changes made in iOS 12, but I can't find documentation for something that matches this.</p>