title: OpenGL Spotlight shining through from rear-face
body: <p>I have a Spotlight source in OpenGL, pointing towards a texture mapped sphere.  </p>
  
  <p>I rotate the lightsource with the sphere, such that if I rotate the sphere to the 'non-light' side, that side should be dark.  </p>
  
  <p>The odd part is, the spotlight seems to be shining through my sphere (it's a solid, no gaps between triangles.  The light seems to be 'leaking' through to the other side.  </p>
  
  <p>Any thoughts on why this is happening?</p>
  
  <p>Screenshots:</p>
  
  <p><a href="http://www.logisticchaos.com/front.png" rel="nofollow noreferrer">Front view, low light to emphasize the problem</a></p>
  
  <p><a href="http://www.logisticchaos.com/back.png" rel="nofollow noreferrer">Back view, notice the round area that is 'shining through'</a></p>