Before motion capture was a thing, there was rotoscoping. Sure, it’s wasn’t quite as entertaining as strapping middle-aged actors into black bodysuits studded with various balls and gizmos, but it was a versatile technique that’s been used in everything from Disney movies to the music video for “Yellow Submarine.” Invented by Max Fleischer and put to use largely in his 1940s Superman serials, the technique involves filming live-action footage and then tracing over it to create animated characters with realistic movement. It was originally a bit of a painstaking process, with artists having to project live-action scenes onto a frozen glass panel…