How was CG not so much more expensive than Star Trek 2?
As any fool knows, in the same year, Star Trek II (http://www.imdb.com/title/tt0084726) was released with a CG sequence not lasting more than a minute. As I understand it, this scene was a significant portion of the budget. Now looking at the budgets for the 2 movies, Tron had a much bigger budget, but it was not orders of magnitude bigger. However, the CG in Tron was orders of magnitude bigger. Can anyone explain that?
My best guess is that the CG in Star Trek was much more complex, while the forms were much simpler in Tron, but it's a pretty wild one.