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Implicit Skinning: Real-Time Skin Deformation with Contact Modeling
Rodolphe Vaillant, Loic Barthe, Gael Guennebaud, Marie-Paule Cani, Damien Rohmer, Brian Wyvill, Olivier Gourmel, Mathias Paulin
Implicit surface composition on top of geometric skinning that produces contact and bulge effects at the joints in real time.
Abstract
Geometric skinning techniques, such as smooth blending or dual-quaternions, are very popular in the industry for their high performances, but fail to mimic realistic deformations. Other methods make use of physical simulation or control volume to better capture the skin behavior, yet they cannot deliver real-time feedback. In this paper, we present the first purely geometric method handling skin contact effects and muscular bulges in real-time. The insight is to exploit the advanced composition mechanism of volumetric, implicit representations for correcting the results of geometric skinning techniques. The mesh is first approximated by a set of implicit surfaces. At each animation step, these surfaces are combined in real-time and used to adjust the position of mesh vertices, starting from their smooth skinning position. This deformation step is done without any loss of detail and seamlessly handles contacts between skin parts. As it acts as a post-process, our method fits well into the standard animation pipeline. Moreover, it requires no intensive computation step such as collision detection, and therefore provides real-time performances.
How to read this
- Category
- Method: real-time skin deformation with contact
- Contributions
- First purely geometric real-time method to produce skin contact effects and muscular bulges at joints
- Approximates the mesh with a set of implicit surfaces and uses their volumetric composition operators to correct geometric-skinning positions
- Acts as a post-process on smooth-skinning output, adding no detail loss and needing no collision-detection step, fitting the standard animation pipeline
- Context
- Corrects classic geometric skinning (Kavan et al. Skinning with Dual Quaternions and smooth blending) using implicit-surface composition to recover effects those methods miss.Builds on: Skinning with Dual Quaternions
- Correctness
- Achieves real-time contact and bulge without physical simulation or explicit collision detection; results are an implicit-composition approximation of skin behavior rather than a physically validated one, and quality depends on how well the implicit surfaces approximate the mesh.
- Clarity
- Accessible motivation; a first pass conveys the post-process correction idea, a second pass is needed for the implicit-surface fitting and composition operators.
- How to read it
- First read why geometric skinning fails at joints and how implicit composition fixes it as a post-process; a second pass on the surface approximation and blending operators pays off for implementers.
Builds on
Related work
- Patch-based Surface Relaxation 2018 / SIGGRAPH
- Delta Mush: Smoothing Deformations While Preserving Detail 2014 / DigiPro
- Skinning: Real-time Shape Deformation 2014 / SIGGRAPH
- A Neural Network Model for Efficient Musculoskeletal-Driven Skin Deformation 2024 / SIGGRAPH
Keywords
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