title: CSS3 Transform and Perspective
body: <p>I have an image that I'm rotating using rotateY. At the moment it rotates through 90 degrees (i.e. is edge on for the viewer) I want to reduce its opacity (using JavaScript). Thus it appears faded when it's back is to the viewer.</p>
  
  <p>However, since I have a perspective set, it doesn't actually appear edge on when rotated through 90 degrees.</p>
  
  <p>Is there a way to determine when the image appears edge on, without churning through the transform calculations myself? </p>