title: is it possible to render particles behind semi transparent objects in scene kit ?
body: <p>I'm trying out Scenekit and I'm running into an issue when I'm trying to render particles behind semi transparent objects. They simply don't render while other objects in the scene do.</p>
  
  <p><a href="https://i.stack.imgur.com/pZOVR.png" rel="noreferrer"><img src="https://i.stack.imgur.com/pZOVR.png" alt="enter image description here"></a></p>
  
  <p>On this pictures all particles are in front of the semi transparent box, all particles that are behind are not displayed. You can see that the sphere is properly displayed and the colors of the covered part are attenuated. I would expect the same from the particles but maybe the rendering choices of the framework to make particle systems efficient make this kind of behaviour normal ?</p>
  
  <p>I've tried to google/stackoverflow it, but it seems that scenekit is not a very well covered topic.</p>