Hey Mylenium —
I can’t get your method to work properly. I was also going to use this to simulate ‘diffraction’ like in that new hyundai commercial. It looks almost like light is bending, and a similar effect was used in harry potter — the Azkaban one — when he’s on the lake and says hocus pocus and makes those strange grim reaper like monsters fly away. Its like having a forcefield — but we’re bending the light on the edges of it like a prism and the center is scaled up.
If that makes sense, rock!