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Aura Mesh: Motion Retargeting to Preserve the Spatial Relationships between Skinned Characters
Volumetric aura mesh surrounding each character encodes proximity relationships, preserving interaction semantics during motion retargeting.
Abstract
Applying motion‐capture data to multi‐person interaction between virtual characters is challenging because one needs to preserve the interaction semantics while also satisfying the general requirements of motion retargeting, such as preventing penetration and preserving naturalness. An efficient means of representing interaction semantics is by defining the spatial relationships between the body parts of characters. However, existing methods consider only the character skeleton and thus are not suitable for capturing skin‐level spatial relationships. This paper proposes a novel method for retargeting interaction motions with respect to character skins. Specifically, we introduce the aura mesh, which is a volumetric mesh that surrounds a character's skin. The spatial relationships between two characters are computed from the overlap of the skin mesh of one character and the aura mesh of the other, and then the interaction motion retargeting is achieved by preserving the spatial relationships as much as possible while satisfying other constraints. We show the effectiveness of our method through a number of experiments.
How to read this
- Category
- Method: interaction-preserving motion retargeting
- Contributions
- Introduces the aura mesh, a volumetric mesh surrounding a character's skin that encodes skin-level spatial relationships
- Computes interaction semantics from the overlap between one character's skin mesh and another's aura mesh
- Retargets multi-person interaction motions by preserving these spatial relationships while preventing penetration and keeping motion natural
- Context
- Extends classic motion retargeting (Gleicher, Retargeting Motion to New Characters) from skeleton-only constraints to skin-level proximity between interacting characters.Builds on: Retargeting Motion to New Characters
- Correctness
- Validated through a number of interaction-retargeting experiments; the approach assumes a meaningful aura volume around the skin, and readers should consider how aura sizing and tight-contact cases affect the preserved semantics.
- Clarity
- Accessible; a first pass conveys the aura-mesh idea, do a second pass for the relationship-preservation formulation and constraints.
- How to read it
- Focus on how the aura mesh represents spatial relationships and how that objective is balanced against penetration and naturalness; a second pass pays off mainly if you are building a retargeting system.
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