NDLI: Differential blending for expressive sketch-based posing

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Differential blending for expressive sketch-based posing

Content Provider	ACM Digital Library
Author	Baran, Ilya Öztireli, A. Cengiz Dalstein, Boris Sumner, Robert W. Gross, Markus Popa, Tiberiu
Abstract	Generating highly expressive and caricatured poses can be difficult in 3D computer animation because artists must interact with characters indirectly through complex character rigs. Furthermore, since caricatured poses often involve large bends and twists, artifacts arise with traditional skinning algorithms that are not designed to blend large, disparate rotations and cannot represent extremely large rotations. To overcome these problems, we introduce a differential blending algorithm that can successfully encode and blend large transformations, overcoming the inherent limitation of previous skeletal representations. Based on this blending method, we illustrate a sketch-based interface that supports curved bones and implements the line-of-action concept from hand-drawn animation to create expressive poses in 3D animation. By interpolating stored differential transformations across temporal keyframes, our system also generates caricatured animation. We present a detailed technical analysis of our differential blending algorithm and show several posing and animation results created using our system to demonstrate the utility of our method in practice.
Starting Page	155
Ending Page	164
Page Count	10
File Format	PDF MP4
ISBN	9781450321327
DOI	10.1145/2485895.2485916
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-07-19
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Skeletal animation Deformation Posing Skinning
Content Type	Audio Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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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