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Geometric Skinning with Approximate Dual Quaternion Blending
Dual quaternion blending for skeletal skinning that eliminates the candy-wrapper artifact of LBS at negligible extra computational cost.
Abstract
Skinning of skeletally deformable models is extensively used for real-time animation of characters, creatures and similar objects. The standard solution, linear blend skinning, has some serious drawbacks that require artist intervention. Therefore, a number of alternatives have been proposed in recent years. All of them successfully combat some of the artifacts, but none challenge the simplicity and efficiency of linear blend skinning. As a result, linear blend skinning is still the number one choice for the majority of developers. In this article, we present a novel skinning algorithm based on linear combination of dual quaternions. Even though our proposed method is approximate, it does not exhibit any of the artifacts inherent in previous methods and still permits an efficient GPU implementation. Upgrading an existing animation system from linear to dual quaternion skinning is very easy and has a relatively minor impact on runtime performance.
How to read this
- Category
- Method: a skeletal skinning algorithm (journal version)
- Contributions
- Skinning via a linear combination of dual quaternions that removes the candy-wrapper and related LBS artifacts
- An approximate blend that still permits an efficient GPU implementation
- Easy upgrade path from linear blend skinning with minor runtime cost
- Context
- Is the extended journal treatment of the authors' earlier Skinning with Dual Quaternions, refining the approximate dual-quaternion blending approach.Builds on: Skinning with Dual Quaternions
- Correctness
- Demonstrated as an artifact-free real-time skinning method that is explicitly approximate yet free of the prior methods' artifacts; readers should keep in mind it blends rigid transforms only and does not model soft-tissue dynamics or muscle bulging.
- Clarity
- Accessible with clear motivation; a first pass conveys the result, a second pass is needed to follow the dual-quaternion derivation and the approximation analysis.
- How to read it
- If you only read one of the two dual-quaternion papers, read this fuller version; first pass for the idea and figures, second pass on the blend formulation for implementation.
Builds on
Built upon by
Nothing yet.
Related work
- Skinning with Dual Quaternions 2007 / SIGGRAPH
- Stretchable and Twistable Bones for Skeletal Shape Deformation 2011 / SIGGRAPH Asia
- Skinning: Real-time Shape Deformation 2014 / SIGGRAPH
- Elasticity-Inspired Deformers for Character Articulation 2012 / SIGGRAPH Asia
Keywords
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