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National Taiwan University
SD Models: Super-Deformed Character Models Sheng-Jie Luo Liang-Tsen Shen Bing-Yu Chen Chun-Kai Huang National Taiwan University
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SD 1 7 1 2.5 © Crypton Future Media, INC.
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Applications Ahmed lumei © Rilakkuma
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Challenges
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Goal - + - + optimization Input model Output model Body Proportions
Head Proportion Body-to-feet Proportion Body-to-head Width Proportion Body Proportions - + Enlarge Scale Stretch Scale Signature Characteristics Input model Output model optimization
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Related Work
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Mesh Deformation Surface-based deformation techniques
Alexa et al. 2003 Lipman et al. 2004 Sorkine et al. 2004 Zhou et al. 2005 Huang et al. 2006
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Mesh Deformation Skeleton-based deformation techniques
Linear-Blend Skinning (LBS) Magenat-Thalmann et al. 1988 Lewis et al. 2000
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Geometry Processing Mesh simplification Cigmoni et al. 1997
Garland et al. 1997 Lindstrom et al. 2000 Luebke et al. 2002
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Geometry Processing Mesh smoothing Field et al. 1988
Shontz et al. 2003 Baker et al. 2004 Eigensatz et al. 2008
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Artistic Stylization Deussen et al. 2000 Qu et al. 2008
Gal et al. 2007 Rivers et al. 2010
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Our Method
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User Input: Body Proportion
Input model Head proportion Body-to-feet proportion Body-to-head width proportion - + - + - + - +
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User Input: Signature Characteristics
Marking signature characteristics - + Enlarge Scale Input model - + Stretch Scale Input model
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Skeleton Baran et al. SIGGRAPH2007 Template
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Overview Optimization-based approach Input model & skeleton
Mesh Deformation Output model Deformed skeleton Skeleton Deformation
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Skeleton Deformation
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Skeleton Deformation
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Mesh Deformation Body proportion constraint
Signature characteristic constraint Primitive fitting constraint Detail smoothing constraint Total energy and optimization
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Body Proportion
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Signature Characteristic
Emphasizing along Skeleton Axes
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Signature Characteristic
Emphasizing along Skeleton Orthogonal Directions
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Primitive Fitting Fitting head to a sphere
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Primitive Fitting Fitting limbs to a capsule shape
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Detail Smoothing
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Total Energy and Optimization
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Result Different body proportion parameters Input model
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Result Different body proportion parameters Input model
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Result 25273 vertices, seconds
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Result 4712 vertices, 2.48 seconds
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Result 1480 vertices, seconds
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Result 5000 vertices, seconds
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Body-part uniformly scaling
Comparison Input model Body-part uniformly scaling Artist hand crafted Our method
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User Study 47 users 12 input models
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User Study How cute? 1(Negative) 5(Positive)
Are the SD counterparts cuter than the original model? Which head proportion is cuter? 3 2 4 5 3.5 Input model
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Limitation Correctly embedded skeleton
Self-intersections and vertex sampling density Texture
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Conclusion Optimization-based technique
Semi-automatically create a character model with the SD style Customization Parameters with body proportion Signature
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Future Work Solving texture distortion Texture stylization
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Acknowledgments We thank the anonymous reviewers for their thoughtful suggestions, and also thank Digimax and SolidWorks for providing high quality character models. We also thank Sei Imai for designing The cartoon character Hatsune Miku’s SD version. This research was supported in part by the National Science Council of Taiwan under grant NSC E MY2.
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Thank you! SD Models: Super-Deformed Character Models
Liang-Tsen Shen, Sheng-Jie Luo, Chun-Kai Huang, and Bing-Yu Chen Thank you! Additional materials:
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