Since we are on the subject of TRON lets talk about the work done by its VFX supervisor:
HARRISON ELLENSHAW (http://en.wikipedia.org/wiki/Harrison_Ellenshaw)
"Harrison Ellenshaw joined Walt Disney Studios as a matte artist, moonlighted to render a number of paintings for Star Wars, and then oversaw the matte department on The Empire Strikes Back at George Lucas' premier effects facility Industrial Light and Magic (ILM). Later, upon his return to Disney in 1989 for Dick Tracy, Harrison headed Disney Studios' own highly regarded effects facility: Buena Vista Visual Effects (BVVE). He has been nominated for an Academy AwardŽ along with his father, Peter Ellenshaw, for special visual effects work on The Black Hole. "
Here is a video interview: