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It's a UVN Face Rig, Charlie Brown: Facial Techniques for Peanuts
Adam Burr, Steve Gressak, Matthew Doble, Christian Haniszewski, Ignacio Barrios, Brian Anderson, Ferris Webby
UVN-space facial rig for The Peanuts Movie letting features slide along curved head volumes while preserving 2D shape language, developed with Autodesk for Maya.
Abstract
The Peanuts Movie required Blue Sky Studios to bring Charles Schulz's iconic characters into 3D while preserving the clean profiles, smooth round head shapes, and extreme facial expressions of the original comic. Traditional blend-shape methods produced surface distortions and volume loss from linear interpolation, so the team transformed head mesh vertices into a UVN coordinate space defined by a NURBS surface built into each head, letting linear translations in UVN space become volume preserving curved paths in Cartesian space. A procedural Peanuts factory reshaped Charlie Brown's NURBS surface to fit each kid's head so his sculpted expressions could be reused, and art directed character views provided per viewing angle on model starting poses to match Schulz's 2D aesthetic.
How to read this
- Category
- Production talk / rigging technique breakdown
- Contributions
- A UVN-space facial rig (built with Autodesk for Maya) that maps head-mesh vertices into a NURBS-defined UV plus normal coordinate space so linear UVN translations become volume-preserving curved paths in Cartesian space
- Preservation of the Peanuts 2D shape language (clean profiles, round heads, extreme expressions) while moving the characters into 3D, avoiding the surface distortion and volume loss of linear blendshapes
- A procedural 'Peanuts factory' that reshapes the NURBS surface per character to reuse Charlie Brown's sculpted expressions, with art-directed per-viewing-angle on-model poses
- Context
- Extends direct-manipulation blendshape rigging (Lewis & Anjyo, Direct Manipulation Blendshapes) by reparameterizing facial motion into a curved UVN volume to keep stylized silhouettes intact.Builds on: Direct Manipulation Blendshapes
- Correctness
- Studio practice for a specific stylized show, not peer-reviewed; results are production-proven on The Peanuts Movie, and the UVN approach is tailored to round, simple head topology rather than a general claim about all face rigs.
- Clarity
- Very readable as a craft talk; a single pass conveys the UVN idea and motivation.
- How to read it
- Read once for the UVN reparameterization intuition (why curved paths preserve volume) and the per-angle on-model trick; no deep second pass needed unless adapting it to your own stylized character.
Builds on
Built upon by
Nothing yet.
Related work
- Reconstruction of Personalized 3D Face Rigs from Monocular Video 2016 / SIGGRAPH
- Interactive Sculpting of Digital Faces Using an Anatomical Modeling Paradigm 2020 / Eurographics
- Sketch-Based Controllers for Blendshape Facial Animation 2015 / Eurographics
- Direct manipulation of blendshapes using a sketch-based interface 2018 / Web3D
Keywords
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