1. CS 395: Adv. Computer Graphics
This is NPR: Non-Photorealistic Rendering
Jack Tumblin

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

3. Big Ideas in NPR What can artists offer us? Can we help them?
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
What can we learn from the human visual system?

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).

11. 3D-Guided, Semantic NPR Kowalski et al, “Art-Based Rendering”
SIGGRAPH`99

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

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

14. More NPR Resources Great on-line surveys / tutorials: Craig Reynolds
Great Book: “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: