The reason that Tron is the only live-action feature to heavily rely upon backlight animation. To begin with, the resulting "cell sandwiches" of transparencies, mattes, etc., were very thick and difficult to flatten. Per an estimation in the aforementioned American Cinematographer article, Tron contained between 400,000 and 500,000 animation elements. Backlight animation is very, very labor-intensive before you add a live-action element into the mix (indeed, a good portion of this work was ultimately outsourced to a studio in Taiwan). Backlight animation tends to be relegated to static elements, since tracking a moving target with cut-out transparencies is asking for a migraine. But, as Lisberger puts it in the making-of doc, backlight animation was "at the time, the solution to the design problem."

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