title: Add background blur to a SKSpriteNode (or SKScene)
body: <p>I have an <strong>OverlayPanel SKScene</strong> on a <strong>SCNScene</strong>. This panel contains colors as <strong>SKSpriteNode</strong>. I don't know how to add a background blur effect to the panel.</p>
  
  <p><a href="https://i.stack.imgur.com/Elpk8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Elpk8.png" alt="This is the ColorPanel SKScene"></a></p>
  
  <p>Another question: I use this method to add the panel:</p>
  
  <pre><code> colorPanelScene = SKScene(fileNamed: "art.scnassets/ColorPanelScene")!
   SCNsceneView.overlaySKScene = colorPanelScene
   SCNsceneView.overlaySKScene!.userInteractionEnabled = true;
  </code></pre>
  
  <p>Is this the correct way or should I create the panel as a <strong>separate UIView</strong> (and apply the blur effect in a simplier way)? </p>