Stop-motion with controlled incremental motion between frames, capturing motion blur naturally. ILM perfected this in the '80s for dinosaurs in Jurassic Park.
While classic stop-motion is completely static between frames, Go-Motion moves the figure itself during exposure—a controlled shift that creates natural motion blur. This is the crucial difference: real cameras record movement as streaks because the sensor is active during the exposure time. Stop-motion puppets without this technique therefore always appear slightly sterile, too precise. Go-Motion remedies this optical deficiency by moving the figure minimally but measurably while the frame is being exposed. The result: fluidity, weight, physical presence instead of the jerky energies of puppet shows.
Industrial Light & Magic perfected this method in the early 1980s—Phil Tippett and his team used Go-Motion for The Empire Strikes Back and later Return of the Jedi to animate AT-ATs and Speeder bikes. The workflow was precise: camera stationary, open exposure, move figure (often with motorized rigs), close exposure, frame exposed. Then position figure for the next frame, repeat. Digital motion control systems later controlled these movements—reproducible, consistent, measurable in millimeters per frame.
In practice, Go-Motion required more hardware than classic stop-motion: motor control, precise armatures, more stable rigs. The puppets themselves had to be more robust because repeated small movements create greater stress. Lighting became trickier—one had to anticipate the expected direction of movement to guide motion blur logically. A common mistake: too much movement during exposure appears smudged, illegible. The balance is delicate—between invisible and cinematic.
Today, Go-Motion plays a smaller role since digital VFX techniques simulate motion optics directly in post-production. But the difference from pure stop-motion remains: Go-Motion still has a physical, documentary quality that is difficult to replicate purely digitally. Those shooting hybrid scenes—live-action with stop-motion elements—often instinctively turn to Go-Motion because it marries more seamlessly with live-action lenses.