Pattern Formation in Computer Graphics Marcelo Walter Instituto de - PowerPoint PPT Presentation

Pattern Formation in Computer Graphics Marcelo Walter Instituto de Informática – UFRGS VISGRAF Lab Webinar 23/09/2020

A little bit about our World… Objects have shape and https://www.monaconatureencyclopedia.com/giraffa-camelopardalis/?lang=en appearance Imagem de Nenad Maric por Pixabay 2

A little bit about our World… in Computer Graphics Objects have shape and appearance separated … 3

The Need for Integration Equus burchelli (26 stripes) E. Zebra (55 stripes) A unity underlying the different zebra striping patterns. B. L. Bard Jonathan. J ournal of Zoology: 183(4), 1977 E. Grevyi (80 stripes)

5000!! Diversity in Animal Kingdom Contrasting coloration in terrestrial mammals. T. Caro. Phil. 5 Trans. R. Soc. B (2009) 364, 537–548

3 A Brief Timeline 1 4 1991 2003 2010 2001 2 6

New Kid on the Block

Can the Ethiopian change his skin, or the leopard his spots? Neither can you do good who are accustomed to doing evil. Jeremiah ch. 13, v. 23 KING RICHARD III Rage must be withstood: Give me his gage: lions make leopards tame. THOMAS MOWBRAY Yea, but not change his spots: take but my shame.

Seashells – Fully Integrated Model Modeling Seashells Deborah R. Fowler, Hans Meinhardt, Przemyslaw Prusinkiewicz 9 Proceedings of SIGGRAPH 92

What about other domains? Fortaleza Canyon – RS http://www.africanbudgetsafaris.com/images/tours/three-rondawels.jpg 10

What about the Plant Kingdom? 11 Robert W. Korn. Watermelon stripes. A case for the clonal mosaic model in plants . Journal of Theoretical Biology (2007)

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A unifying theory? http://en.wikipedia.org/wiki/Loricariidae Hanwoo Cow Biology of epidermal and hair pigmentation in cattle: a mini-review. Seo K, Mohanty TR, Choi T, Hwang I. Vet Dermatol. 2007;18(6):392-400 13

To Wrap it Up The Bad News is that we still have a long way to go! The Good News is that we still have a long way to go! 14

Referências Turk, G. (1991). Generating textures on arbitrary surfaces using reaction- 1 diffusion. Acm Siggraph Computer Graphics , 25 (4), 289-298. Walter, M., Fournier, A., & Menevaux, D. (2001). Integrating shape and 2 pattern in mammalian models. In Proceedings of the 28th annual conference on Computer graphics and interactive techniques (pp. 317-326). Zhang, J., Zhou, K., Velho, L., Guo, B., & Shum, H. Y. (2003). Synthesis of 3 progressively-variant textures on arbitrary surfaces. ACM Transactions on Graphics (TOG) , 22 (3), 295-302. Wang, L., Zhou, K., Yu, Y., & Guo, B. (2010). Vector solid textures. ACM 4 Transactions on Graphics (TOG) , 29 (4), 1-8. 15

Obrigado! marcelo.walter@inf.ufrgs.br