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CS 395: Adv. Computer Graphics

This document delves into Non-Photorealistic Rendering (NPR), emphasizing its artistic applications in computer graphics. It poses the question of what constitutes the "best picture for every task," contrasting traditional photorealistic aims with the need for versatile artistic representations. The discussion includes methodologies for imitating various artistic media such as watercolor and pencil, supported by machine learning techniques. It references key works and resources in the field, showcasing advances in NPR, particularly at conferences like ACM NPAR and through influential publications.

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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 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 http://www.red3d.com/cwr/npr/ • 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: http://citeseer.nj.nec.com/cs

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