Hey, here is a small dispersion shader that works with just one glass-node.
It isn't efficient to render things like this with cycles but it's a nice "experiment".
I hope you like is... :)
Nice one. I love these rainbow experiment with light.
I've updated the .blend!
Found out the light-source was a big crap! Now it renders about 300 x faster! o.O
Nope, rendering on GPU too but in OSL it could be faster...
I may never had struggled with Luxrender if I'd seen this. Nice work!