Josh Nimoy mentioned openFrameworks in his Tron Legacy post So why not try it myself.
After some pointers from arturo I managed to get these smooth gradient arcs.

Using the FBO and ofMesh from the upcoming openFrameworks 0.7 release.
The nice people of hangaar used the below source code in one of their party setups.
Check their nice video.
Source code on GitHub
Binary for OSX
As extra I modified it the code to run on a Multitaction cell