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ARAPLBS: Robust and Efficient Elasticity-Based Optimization of Weights and Skeleton Joints for Linear Blend Skinning with Parametrized Bones

Jean-Marc Thiery and Elmar Eisemann

Left: 16 small bones Right: a spine used for the torso and converted back to 16 bones.

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We present a fast, robust and high-quality technique to skin a mesh with reference to a skeleton. We consider the space of possible skeleton deformations (based on skeletal constraints, or skeletal animations), and compute skinning weights based on an optimization scheme to obtain as-rigid-as-possible (ARAP) corresponding mesh deformations. We support stretchable-and-twistable bones (STBs) and spines by generalizing the ARAP deformations to stretchable deformers. Additionally, our approach can optimize joint placements. If wanted, a user can guide and interact with the results, which is facilitated by an interactive feedback, reached via an efficient sparsification scheme. We demonstrate our technique on challenging inputs (STBs and spines, triangle and tetrahedral meshes featuring missing elements, boundaries, self-intersections, or wire edges).

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Citation

Jean-Marc Thiery and Elmar Eisemann, ARAPLBS: Robust and Efficient Elasticity-Based Optimization of Weights and Skeleton Joints for Linear Blend Skinning with Parametrized Bones, Computer Graphics Forum, 37, pp. 32–44, 2018.

BibTex 

@article{bib:thiery:2018,
    author       = { Thiery, Jean-Marc and Eisemann, Elmar },    
    title        = { ARAPLBS: Robust and Efficient Elasticity-Based Optimization of Weights and Skeleton Joints for Linear Blend Skinning with Parametrized Bones },
    journal      = { Computer Graphics Forum },
    volume       = { 37 },
    year         = { 2018 },
    pages        = { 32--44 },
    doi          = { 10.1111/cgf.13161 },
    dblp         = { journals/cgf/ThieryE18 },
    url          = { https://publications.graphics.tudelft.nl/papers/355 },
}