NDLI: Reducing blendshape interference by selected motion attenuation

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Reducing blendshape interference by selected motion attenuation

Content Provider	ACM Digital Library
Author	Neumann, Ulrich Lewis, J. P. Deng, Zhigang Mooser, Jonathan
Abstract	Blendshapes (linear shape interpolation models) are perhaps the most commonly employed technique in facial animation practice. A major problem in creating blendshape animation is that of blendshape interference: the adjustment of a single blendshape "slider" may degrade the effects obtained with previous slider movements, because the blendshapes have overlapping, non-orthogonal effects. Because models used in commercial practice may have 100 or more individual blendshapes, the interference problem is the subject of considerable manual effort. Modelers iteratively resculpt models to reduce interference where possible, and animators must compensate for those interference effects that remain. In this short paper we consider the blendshape interference problem from a linear algebra point of view. We find that while full orthogonality is not desirable, the goal of preserving previous adjustments to the model can be effectively approached by allowing the user to temporarily designate a set of points as representative of the previous (desired) adjustments. We then simply solve for blendshape slider values that mimic desired new movement while moving these "tagged" points as little as possible. The resulting algorithm is easy to implement and demonstrably reduces cases of blendshape interference found in existing models.
Starting Page	25
Ending Page	29
Page Count	5
File Format	PDF
ISBN	1595930132
DOI	10.1145/1053427.1053431
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-04-03
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	User interaction Facial animation
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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