title: Back face culling in SceneKit
body: <p>I am currently trying to set up a rotating ball in scene kit. I have created the ball and applied a texture to it.</p>
  
  <pre><code>ballMaterial.diffuse.contents = UIImage(named: ballTexture)
  ballMaterial.doubleSided = true
  ballGeometry.materials = [ballMaterial]
  </code></pre>
  
  <p>The current ballTexture is a semi-transparent texture as I am hoping to see the back face roll around.</p>
  
  <p>However I get some strange culling where only half of the back facing polygons are shown even though the doubleSided property is set to true.</p>
  
  <p>Any help would be appreciated, thanks.</p>