The Polar Express (2004) is a computer-animated film. Its characters, train and world are digital imagery, not filmed live action and not stop-motion. Much of the human movement began as recorded actors’ performances, which artists then refined, and some characters were animated entirely by hand.
Real performances combined with digital imagery is why people argue about what kind of film it is. This guide explains what was captured, what animators added, which characters were animated entirely by hand, and how the film relates to Chris Van Allsburg’s picture book.
The short answer
- Format: a 2004 animated feature directed by Robert Zemeckis, built largely on performance capture
- Capture and digital production: Sony Pictures Imageworks
- Based on: Chris Van Allsburg’s 1985 picture book
- Not: live action with effects added, or stop-motion with physical puppets
Three terms help. Performance capture records an actor’s body and facial movement as data. Computer animation is the digital imagery on screen. Live action means the photographed performers and sets are what you see. The Polar Express used the first to help make the second.
What performance capture recorded
Sony Pictures Imageworks built a proprietary system called Imagemotion for the film. Sony’s 2004 announcement describes it as able to record high-fidelity facial and body motion of several actors on a stage at the same time, with cameras giving 360-degree coverage.
The ACM SIGGRAPH archive entry for the film’s 2004 presentation explains the point: earlier methods often recorded face and body separately, while this system captured them together, for up to four performers at once.
What animators added
Capture was a starting point, not a finished picture. In his production diary, animation supervisor David Schaub estimated that capture delivered about 70 to 80 percent of a performance, making the result a hybrid of capture and animation.
- Eyes and brows: markers around the eyes were often hidden, so capture was switched off there and animators created the eyebrow movement.
- Director’s changes: when Zemeckis wanted a different performance, the change was often made in animation instead of recapturing the actor, and some shots were reanimated from the ground up.
- Camera work: the camera moves were designed after the performance shoot, on a virtual set.
The SIGGRAPH entry sums it up the same way: motion capture blended with keyframe animation, plus digital cloth, lighting and compositing.
How a “camera” filmed a digital world
Because the sets and characters were digital, there was no physical camera on the final images. Sony’s announcement describes a virtual camera system that let a live-action camera operator choreograph camera moves on the digital characters after the motion was captured. Chen told VFXWorld that the team used wheel controls, like those on a real camera head, so the moves would feel operated by a person rather than plotted point by point.
That is one reason the film can look like it was shot with a camera even though nothing in the frame was photographed.
Characters animated entirely by hand
Not everything on screen began as an actor’s movement. In the final part of his diary, Schaub explains that the wolves, eagle, caribou and reindeer could not be directed on a capture stage, so they were keyframed, meaning animators set their poses and timing by hand. The drifting ticket sequence was also hand-animated.
Two human-like characters were keyframed too. Smokey and Steamer, voiced by Michael Jeter, were designed with exaggerated proportions, and Schaub says retargeting capture data to them did not translate believably, so they were animated traditionally from the ground up.
Why it is not live action, and not stop-motion
The actors performed on a capture stage, but that footage is not what appears on screen. Their recorded motion drove digital characters in digital sets, and the final frames were rendered by computer.
It is also not stop-motion. Stop-motion photographs a physical puppet or model, moved slightly between frames. The Polar Express has no physical puppets in its final images. A train that looks solid, or a face with realistic proportions, does not make a digital character a photographed puppet.
Tom Hanks and the young hero
Tom Hanks led the cast. According to the SIGGRAPH entry, the system had to let him perform as multiple digital characters, including the main role of a young boy. This guide does not give a role count.
Senior visual effects supervisor Jerome Chen told VFXWorld that the designers nudged the boy’s eyebrows and mouth towards Hanks’s own, because the performance then transferred better.
The book behind the film
Chris Van Allsburg wrote and illustrated The Polar Express. Reading Is Fundamental’s book record gives its copyright year as 1985, and the American Library Association lists the Houghton edition as the 1986 Caldecott Medal winner, describing its oil pastels and atmospheric double-page spreads.
That painterly look shaped the film. Schaub writes that reproducing the stylization of Van Allsburg’s book was the primary objective, and that staying in a computer-generated world gave the filmmakers control over that look. The book is from 1985; the film is from 2004.
UK rating and running time
- Rating: the BBFC rated the film U for mild threat.
- Timings: 99 minutes 50 seconds for the 2004 UK cinema release in 2D, and 100 minutes 54 seconds for the 3D version.
- Content notes: brief scenes of mild threat, such as a train skidding on breaking ice, which the BBFC says are swiftly resolved.
Watching it with this in mind
Knowing the method can change what you notice. Human characters move with the timing of real performances, while the animals and the two train crew characters have the broader, more stylised motion of hand animation. Neither approach is the “real” one; the film deliberately mixes them.
Quick answers
Was all of it motion capture?
No. See the hand-animated characters listed above.
Is The Polar Express stop-motion?
No. No physical puppets were photographed for the final film.
Related reading
For another family film that people often mistake for stop-motion, see Is Monster House stop-motion?