2.5D Cartoon Models Author - Alec Rivers from MIT Siming Liu 1

Overview Artist draws different views 2

Overview 2.5D model automatically compute intermediate views 3

3D Interpolation 4

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Preserve 2D appearance of cartoons No 3D model Just translate and interpolate vector art using limited 3D inferences 6

Related Work 2D3D 7

2D3D [Johnston and Thomas, 1981] [Sederberg and Greenwood, 1992] [Alexa et al., 2000] 8

2D3D [Johnston and Thomas, 1981] [Sederberg and Greenwood, 1992] [Alexa et al., 2000] [Rademacher, 1999] [Decaudin, 1996] [Northrup and Markosian, 2000] 9

2D3D [Johnston and Thomas, 1981] [Sederberg and Greenwood, 1992] [Alexa et al., 2000] [Decaudin, 1996] [Rademacher, 1999] [Northrup and Markosian, 2000] [Bourguignon et al., 2001] 10 [Di Fiore et al., 2001]

2.5D Cartoon Model 11

2.5D Cartoon Model 12

2.5D Interpolation 2D3D Shape Can be approximated with 2D linear interpolation Requires full 3D mesh; won’t work for some shapes Position Doesn’t capture curved paths Easy with a 3D point Z-OrderingNot possible 13

2D3D Shape Can be approximated with 2D linear interpolation Requires full 3D mesh; won’t work for some shapes Position Doesn’t capture curved paths Easy with a 3D point Z-OrderingNot possible 2.5D Interpolation 14

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Rotate Face Video 19

Modify Key View Video 20

More Complex Video 21

Applications Cartoons in interactive applications Animation – Camera steady, model moves Flash / cell phones – No 3D acceleration required 22

Conclusion Advantages – 2D drawings without real 3D shape are possible – Easy and fast to create – Animation is straightforward Limitations – Highly concave shapes difficult – Models cannot natively be lit, collided with 23

Thanks! Check out the software at: 24