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

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

3. Big Ideas in NPR What can artists teach us?What can artists teach us? –Imitation (theft): Simulate existing artistic media paint, charcoal, pencil, watercolor, marble, …paint, charcoal, pencil, watercolor, marble, … –Imitation (theft): Simulate artistic conventions ‘learn to draw’ books‘learn to draw’ books machine learning on works of artmachine learning on works of art analysis of working artistsanalysis of working artists Can we help them?Can we help them? What can we learnWhat 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 wildCool student projects gone wild Downloadable, modifiable, try it!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, Machine learning, Image analogies, etc....

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

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