post
Rig removal
Tie-down / After Effects compositing
Definition
Rig removal is the post-production work of erasing every visible support a stop-motion puppet needed during the shoot -- tie-down points, wires, remote-control backpacks, and the shadows they cast -- plus the separate cosmetic clean-up of puppet seams a rig-free frame was never meant to show. It is a production bargain struck on the shooting stage as much as in the paint department: the animator is free to use whatever physical support produces the best performance, and the camera and VFX plan accepts responsibility for making that support disappear later.
Overview
The animator is allowed to use whatever physical support produces the best performance, and the camera/VFX plan accepts responsibility for making that support disappear afterward. David Vickery described this bargain plainly on Aardman's The Pirates! In an Adventure with Scientists!: characters could jump, fly, balance and hang because the animation team was free to use exposed armatures, fine lines and multiple poseable rigs. One airship shot used separate supports across a chain of eight characters, while hard sunlight also projected rig shadows onto the set -- so the clean-up problem included not only the metal itself but the image evidence it created. A rig that is easy to animate with can therefore still be expensive to remove, which is why rig design, lighting and post-production are planned together rather than solved one after another.
On LAIKA's Missing Link (2019), the visual-effects team painted out more than 1,000 rigs across the film's 1,486 shots -- including the small remote "backpacks" animators used to trigger fine movements -- and did cosmetic clean-up on more than 106,000 individual puppet-face frames. Ollie Jones, the film's head of rigging, summed up the trade in one line: "That's the sadness and happiness of a riggers life" -- everything his department builds is designed to be erased. The practice predates Missing Link: on Coraline (2009), director Henry Selick wanted to leave the horizontal seam lines from the puppets' replacement-animation face parts visible, as evidence of the handmade object in front of the camera, but LAIKA founder Phil Knight asked for them to be painted out instead -- the decision that turned roto/paint into a standing department rather than a one-off fix. By Missing Link, the volume of that work -- one seam, one frame, one puppet at a time -- had outgrown manual rotoscoping, so LAIKA partnered with Intel's Applied Machine Learning team, based like LAIKA near Portland, Oregon, to train a tool inside Foundry's Nuke on the studio's own roto history; five or six finished shots were enough training data. The tool tracks facial landmark points on a puppet face and generates roto shapes already smooth across space and time, handing artists an editable starting point compatible with standard tools such as Mocha. Lead roto artist James Pina described the gain plainly: "What the tool outputs is fully finished roto. It's a lot faster than we could get if we were doing it by hand -- it's hours of work in a few minutes." The tool remains an assist, not a replacement: artists still refine and make the creative call on every shot.
The strongest rig-removal setups preserve replacement information during photography rather than leaving everything to the paint department. On The Pirates!, repeatable motorized camera moves let Aardman shoot multiple aligned passes, including clean plates, alongside the animated pass -- far more robust than assuming a single still background will solve every frame. A clean plate can supply the texture hidden behind a support, but the compositor must still account for changing shadows, moving props, depth relationships, stereo differences and local surface variation, so a production can also photograph alternate passes or temporarily remove a rig when the shot's geometry permits it. The goal is not one universal plate recipe; it is to leave post with a plausible source for every region a support will uncover.
Aardman's Early Man (2018) confirms the same work outside LAIKA's pipeline, on a clay-puppet feature rather than a replacement-animation one. VFX supervisor Howard Jones (axisVFX) described the baseline task in near-identical terms to LAIKA's own account: "The simplest stuff we do is to remove rigs, and clean up any puncture wounds on the clay." The clay medium adds its own editorial judgment call alongside rig erasure: an animator's fingerprints and tool marks are an expected texture of clay animation, not a flaw, so Jones's team deliberately left much of that surface handling visible even while removing rigs and knife marks -- "we still keep as much of the fingerprints and all the actual natural attributes that comes with the clay-motion." What counts as a blemish to paint out versus a texture to preserve is a studio- and medium-specific call, not a fixed rule: rig removal always erases the apparatus, but cosmetic clean-up beyond that is a matter of taste, and over-cleaning can strip a miniature world of the handmade texture that makes it convincing.
Rig removal is why a stop-motion feature can look physically impossible -- puppets flying, balancing on one toe, suspended mid-leap -- without the audience seeing what actually held them there. Structurally it is the trade the medium always makes: the physical constraint (a puppet needs support) is solved on stage, and the visual constraint (the support must be invisible) is solved afterward, in the same pipeline that handles compositing (see After Effects compositing) and the replacement-face seams documented on Replacement face systems. The most reliable pipelines plan the trade in both directions at once -- choosing rig positions, lighting angles and plate strategies during the shoot, not only fixing what the shoot happened to leave behind.
Workflow
- Choose the rig for animation quality first, then evaluate its removal cost -- keep supports away from high-detail edges, faces, hair, translucent materials and other regions that are expensive to reconstruct, without weakening the pose or performance (see Tie-down).
- Identify every support that will be visible or may cast a visible shadow before shooting, including contact areas, reflective surfaces, moving background elements and camera moves that will reveal new parts of the set.
- Plan replacement imagery: shoot clean plates, alternate passes or temporary rig-free frames wherever they provide reliable background information; for motion-control or stereo work, preserve camera repeatability and record which pass corresponds to which shot state.
- Preserve registration and exposure continuity so the clean source can be aligned with the animated plate; capture additional reference when lighting or practical elements change instead of assuming one frozen plate will match.
- Remove the rig in layers: reconstruct the hidden background, then repair cast shadows and contact regions, then track masks and patches to follow the photographed motion -- by hand, or, on high-volume productions, with a first-pass ML tool (LAIKA's Intel-built tool works inside Nuke) handed to an artist to refine.
- Clean up puppet-specific cosmetic seams separately from rig removal proper -- replacement-face split lines or mask/eyelid gaps are a related but distinct pass -- and decide deliberately what surface texture (fingerprints, tool marks) to preserve rather than erasing it by default.
- Review the cleaned shot in motion and in sequence: check for repeated texture, frozen grain, mismatched lighting and over-cleaning. The pass is complete when the support disappears without making the handmade image look artificially sterilized.