title: How can you create a glow around a sprite via SKEffectNode
body: <p>I have a <code>SKSpriteNode</code> that I'd like to have a blue glow around it's edges for highlighting purposes. I am guessing that I would need to make my sprite a child of a <code>SKEffectNode</code> and then create/apply a filter of some sort. </p>
  
  <p>UPDATE : I have investigated this quite a it with the chosen answer's approach, and discovered that <code>SKEffectNode</code> has a sizeable hit on performance even if you have it set to <code>shouldRasterize</code> and 'no filter' defined. My conclusion is that if your game requires more than 10 moving objects at one time, they can't involve a <code>SKEffectNode</code> even if rasterized.</p>
  
  <p>My solution will likely involve pre-rendered glow images/animations, as SKEffectNode is not going to cut it for my requirements.</p>
  
  <p>If someone has insight as to anything I am missing, I'd appreciate hearing whatever you know!</p>
  
  <p>I am accepting an answer because it does achieve what I asked for, but wanted to add these notes to anyone looking to go this route, so you can be aware of some of the issues with using <code>SKEffectNode</code>.</p>