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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
CS 395: Adv. Computer Graphics

This

is NPR:

Non-

Photorealistic

Rendering

Jack Tumblin

jet@cs.northwestern.edu

big ideas in npr
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.)

big ideas in npr3
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?

simulated watercolor 1997
Simulated Watercolor (1997)

Simulate paper, water, fluid diffusion/soaking, drying,...

“Computer Generated Watercolor”

Curtis,Anderson, Seims, Fleischer,Salesin

SIGGRAPH`97

simulated watercolor
Simulated Watercolor

Faster: blots/splats...

pencil simulation sousa 2000
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.

toon shaders
‘Toon’ Shaders

Long history;

Levoy’77,

...

npr quake shaders
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

3d guided semantic npr
3D-Guided, Semantic NPR

Kowalski et al, “Art-Based Rendering”

SIGGRAPH`99

artistic styles herzmann2000
Artistic Styles: Herzmann2000

Machine learning,

Image analogies, etc....

artistic styles herzmann200014
Artistic Styles: Herzmann2000

Machine learning,

Image analogies, etc....

more npr resources
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