Automatic linearization of nonlinear skinning

Kavan, Ladislav; Collins, Steven; O’Sullivan, Carol

doi:10.1145/1507149.1507157

Cited by 34 publications

(45 citation statements)

References 26 publications

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“…Specifically, deformers based on intrinsic SO(3) [Mohr and Gleicher 2003] and SE(3) [Kavan et al 2009] interpolation eliminate the candy-wrapper artifacts but do not remove the bulging problems while bending. Sweep [Hyun et al 2005] or spline-based deformers [Yang et al 2006;Forstmann et al 2007;Gregory and Weston 2008] produce higher-quality results but are more complex and feature many parameters that need to be tuned manually.…”

Section: Related Workmentioning

confidence: 99%

Elasticity-inspired deformers for character articulation

Kavan

Sorkine

2012

ACM Trans. Graph.

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a) (b) (c) (d) (e) BBW Our method Our method LBS DQS Figure 1: Previous automatic weighting schemes, such as bounded biharmonic weights (BBW) are deformation-agnostic, whereas our method optimizes weights to minimize shape distortion. Combined with our joint-based deformers, we achieve higher-quality results than both linear blend (LBS) and dual quaternion skinning (DQS). Our technique requires no additional user input and its speed is competitive to linear skinning. AbstractCurrent approaches to skeletally-controlled character articulation range from real-time, closed-form skinning methods to offline, physically-based simulation. In this paper, we seek a closed-form skinning method that approximates nonlinear elastic deformations well while remaining very fast. Our contribution is two-fold: (1) we optimize skinning weights for the standard linear and dual quaternion skinning techniques so that the resulting deformations minimize an elastic energy function. We observe that this is not sufficient to match the visual quality of the original elastic deformations and therefore, we develop (2) a new skinning method based on the concept of joint-based deformers. We propose a specific deformer which is visually similar to nonlinear variational deformation methods. Our final algorithm is fully automatic and requires little or no input from the user other than a rest-pose mesh and a skeleton. The runtime complexity requires minimal memory and computational overheads compared to linear blend skinning, while producing higher quality deformations than both linear and dual quaternion skinning.

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Section: Related Workmentioning

confidence: 99%

Elasticity-inspired deformers for character articulation

Kavan

Sorkine

2012

ACM Trans. Graph.

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“…To cope with such artifacts, one possiblity is to expand the expressive power of LBS by either supplying additional weights per bone [6,7], or adding virtual bones expressed as their transformations and weights [8,9]. The new data has to be automatically computed using example poses [5], which often do not exist.…”

Section: Previous Workmentioning

confidence: 99%

As-Rigid-As-Possible Character Deformation Using Point Handles

Luo

Veltkamp

Egges

2015

Advances in Visual Computing

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Abstract. In this paper, we present a versatile, point handles based character skinning scheme. Point handles are easier to design and fit into an object's volume than a skeleton. Moreover, with a conventional blending technique such as linear blending, point handles have been successfully demonstrated to handle stretching, twisting, and supple deformation, which are difficult to achieve with rigid bones. In the context of only blending, limbs, however, are not bent rigidly with point handles, limiting the space of possible deformations. To address this, we propose a method that automatically recovers the local rigidities of limbs via minimizing a surface-based, nonlinear rigidity energy. The minimization problem is subjected to the positions of a set of point handles' proximal vertices. The positions fitting point transformations are computed by linear blend skinning, leading to speedups of the minimization in particular for large deformations. The use of nonlinear energy also allows versatile posing by intuitively selecting which point handles provide their proximal vertices on-the-fly. The degrees of freedom in modeling user constraints are reduced, and the skinning process is automated by relevant functionalities included in our scheme. The effectiveness of our scheme is demonstrated by a variety of experimental results, showing that the scheme could be an alternative to skeletal skinning.

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“…On the other hand, applying a different set of weights for each possible transformation, rotation or scaling requires additional space and time, which can be considered redundant because it is not going to be used in most parts of the skeleton and surface mesh; thus, it is not implemented in most of the popular rendering engines. This problem is addressed by Kavan et al [42], proposing a method of introducing additional blending bones to simulate non-linear skinning. However, this approach is not suitable for a real-time application with previously unknown motions.…”

Section: Bone Splittingmentioning

confidence: 99%

Real-time virtual fitting with body measurement and motion smoothing

Gultepe

Güdükbay

2014

Computers & Graphics

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a b s t r a c tWe present a novel virtual fitting room framework using a depth sensor, which provides a realistic fitting experience with customized motion filters, size adjustments and physical simulation. The proposed scaling method adjusts the avatar and determines a standardized apparel size according to the user's measurements, prepares the collision mesh and the physics simulation, with a total of 1 s preprocessing time. The real-time motion filters prevent unnatural artifacts due to the noise from depth sensor or selfoccluded body parts. We apply bone splitting to realistically render the body parts near the joints. All components are integrated efficiently to keep the frame rate higher than previous works while not sacrificing realism.

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Automatic linearization of nonlinear skinning

Cited by 34 publications

References 26 publications

Elasticity-inspired deformers for character articulation

Elasticity-inspired deformers for character articulation

As-Rigid-As-Possible Character Deformation Using Point Handles

Real-time virtual fitting with body measurement and motion smoothing

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