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Wig Refitting in Pixar's Inside Out 2
Curvenet-based wig rig that shares and reuses hair grooms across Emotion characters of different shapes using surface and volumetric deformations.
Abstract
In Pixar’s feature animation Inside Out 2 (2024), emotion characters are identified with their corresponding human characters by exhibiting similar wigs. To achieve this look, we developed a custom rig that assists the sharing and reuse of hair grooms between characters of different shapes, feature proportions, and mesh connectivities. Our approach starts by adopting curvenets as a light-weighted representation of scalp surfaces that eases the registration from human to emotion models by detaching the groom setup from the underlying mesh discretization. We then implemented a mix of surface-based and volumetric deformations that warp hair shells and guide curves onto the new character’s scalp defined by the refit curvenet. At last, we incorporated a shaping tool for editing the wig layout controlled by additional curvenets that profile each hair shell.
How to read this
- Category
- Production method / talk (Pixar hair-groom reuse rig)
- Contributions
- A custom rig that shares and reuses hair grooms across characters of different shapes, proportions, and mesh connectivities
- Adopts curvenets as a lightweight scalp representation to detach groom setup from mesh discretization and ease human-to-emotion registration
- Mixes surface-based and volumetric deformations to warp hair shells and guide curves onto the refit scalp, plus a curvenet-driven shaping tool for layout
- Context
- A production technique from Inside Out 2 extending the style-guide hair-grooming direction of Montell et al.'s Hair Emoting in Turning Red toward cross-character groom sharing.Builds on: Hair Emoting with Style Guides in Turning Red
- Correctness
- Studio practice, production-proven on the film rather than benchmarked; the curvenet abstraction assumes scalp grooms can be cleanly detached from mesh connectivity, so applicability outside similar stylized character setups is the caveat.
- Clarity
- Accessible and concrete; a first pass conveys the curvenet-plus-deformation pipeline, with details kept practical.
- How to read it
- Focus on the curvenet representation and the surface-plus-volumetric warp that enables groom transfer; a single careful pass suffices unless you are implementing groom refitting, then revisit the deformation specifics.
Builds on
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Related work
- Sketch to Pose in Pixar's Presto Animation System 2015 / SIGGRAPH
- Space Rangers with Cornrows: Methods for Modeling Braids and Curls in Pixar's Groom Pipeline 2022 / SIGGRAPH
- Shaping the Elements: Curvenet Animation Controls in Pixar's Elemental 2023 / SIGGRAPH
- Stable and Efficient Differential IK 2010 / SIGGRAPH Asia
Keywords
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