In the 80’s as computer animation was on the rise one of the thorniest problems was “how do we get this thing we made on the computer… OFF the computer?” There were a lot of unique solutions, but the one I’m fascinated by most is Disney’s solution of using a plotter.
A plotter acted as sort of a 3D printer but for 2D images. There was a ball point pen that could move up and down, and the paper underneath could be moved in and out. Using CAD based programs you could plot points in 2D space and the plotter would draw the lines between them and even do geometric shapes!
When it came time to do The Great Mouse Detective, the animators at Disney wanted to do more dynamic shots for the climatic battle inside Big Ben. Drawing all those gears and cogs would be a nightmare for the animators, so they experimented with using 3D animation.
But this was still the early 80’s. There was no digital ink and paint program, no way to merge the 2D animated characters with the 3D animated backgrounds digitally. So how did they get the 3D animated backgrounds out of the computer?
By drawing each frame on the plotter.
Every frame was printed out on the plotter, and then xeroxed onto animation cels, and then hand painted like traditional 2D animation cels are.
But why the plotter? If they were gonna have to export every frame anyway, why not use a printer? Well… because printers back then just weren’t very good. A plotter uses points and physically draws the line between them, much like how vector graphics work. It yielded a much smoother and higher fidelity line than if they just printed them out.
This was still a massive undertaking, but it was probably the best solution to getting the dynamic camera moves they wanted out on paper. 2D animation was drawn over top and then both layers of animation cels were filmed frame by frame.
And that’s how you got dynamic shots like this in the mid 80’s! 3D animated backgrounds, printed with a plotter, xeroxed onto animation cels, hand painted, and then re-photographed with the 2D animation on top!
This technique would be the standard way Disney got their 3D animation out of the computer for their 2D films… right up until The Rescuers Down Under which was the first fully digital animated feature. That movie used PIXAR’s proprietary CAPS System (hey that name sounds familiar 😉) to combine everything digitally. But that’ll have to be a story for another time!
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