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CS 395: Adv. Computer Graphics

CS 395: Adv. Computer Graphics This is NPR: Non- Photorealistic Rendering Jack Tumblin jet@cs.northwestern.edu Big Ideas in NPR Fine Art What is the goal of computer graphics? ‘A perfect simulation of light transport’? No... ‘The best picture for every task’ ? Drawings,

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CS 395: Adv. Computer Graphics

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  1. CS 395: Adv. Computer Graphics This is NPR: Non- Photorealistic Rendering Jack Tumblin jet@cs.northwestern.edu

  2. Big Ideas in NPR Fine Art • What is the goal of computer graphics? • ‘A perfect simulation of light transport’? No... • ‘The best picture for every task’ ? Drawings, illustrations, paintings... All Great Pictures Optical Images (photos, etc.)

  3. Big Ideas in NPR • What can artists teach us? • Imitation (theft): Simulate existing artistic media • paint, charcoal, pencil, watercolor, marble, … • Imitation (theft): Simulate artistic conventions • ‘learn to draw’ books • machine learning on works of art • analysis of working artists • Can we help them? • What can we learn from human vision?

  4. Simulated Watercolor (1997) Simulate paper, water, fluid diffusion/soaking, drying,... “Computer Generated Watercolor” Curtis,Anderson, Seims, Fleischer,Salesin SIGGRAPH`97

  5. Simulated Watercolor Faster: blots/splats...

  6. Pen-And-Ink: Winkenbach et al 1994+

  7. Pencil Simulation: Sousa 2000 Sousa, M. C. and Buchanan, J. W.Observational Model of Graphite Pencil Materials.Computer Graphics Forum, 19(1):27--49, 2000.

  8. Oil Painting Simulation • .

  9. ‘Toon’ Shaders Long history; Levoy’77, ...

  10. NPR Quake Shaders (real time) Gleicher 2000 .

  11. NPR Quake Shaders M. Gleicher (U. Wisconsin) • Cool student projects gone wild • Downloadable, modifiable, try it! http://www.cs.wisc.edu/graphics/Gallery/NPRQuake/whydWeDoIt.html

  12. 3D-Guided, Semantic NPR Kowalski et al, “Art-Based Rendering” SIGGRAPH`99

  13. Artistic Styles: Herzmann2000 Machine learning, Image analogies, etc....

  14. Artistic Styles: Herzmann2000 Machine learning, Image analogies, etc....

  15. More NPR Resources • Great on-line surveys / tutorials: Craig Reynolds http://www.red3d.com/cwr/npr/ • Great Books:“Non-Photorealistic Rendering” (2001) Bruce Gooch and Amy Gooch, AK Peters • Great Conference:ACM NPAR: Non-Photorealistic Animation and Rendering • Great Online Demos: Google finds most of them... • Great Papers: http://citeseer.nj.nec.com/cs

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