What Pixar films looked like 40 years ago

In 1972, future Pixar co-founder Ed Catmull and University of Utah classmate Fred Parke produced this short film of Catmull's hand, which is one of the earliest examples of 3D computer rendering. The animation eventually showed up in Futureworld (a.k.a. the sequel to Westworld). You can read more about this animation here.

[Robby Ingebretsen via Cartoon Brew]

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I have developed a huge interest in archaic film techniques and I am wondering, back in the late '70s when they were making Futureworld what was the process by which they transferred this digital animation onto film? Is there a name for it or a place you can point me that might describe the technique?

I am really just clueless as to how something like the whole wireframe Death Star trench prep sequence in Star Wars was composited onto 35mm film stock.