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  Reports from SIGGRAPH 2001
 

Papers: Painting and Non-Photorealistic Graphics

by Wendy Ju
July 23, 2002

 

A multitude of techniques and tools for non-photorealistic rendering were presented at Friday afternoon's paper session on painting and non-photorealistic graphics.

Robert Kalnins from Princeton presented a paper entitled "WYSIWYG NPR." The system allows an artist to "paint" directly on a 3D model with stylized elements familiar to 2D paint systems. Kalnins related design considerations of the system, such as parameterized level of detail that allows elements, such as structured hatches painted in one view to scale to fewer strokes in closer views or or more strokes in distant views.

David Benson from ILM and grue DeBry and Jonathan Gibbs from Thrown Clear Productions presented complementary talks on the use of Octree structures to render surface textures efficiently. These structures allow variable resolution of textures based on geometry, which enhances the animators ability to map a 2D texture onto a 3D model without artifacts such as stretching or warping. The Thrown Clear octrees differed from the ILM implementation because their nodes were multi-mapped, allowing each octree node to hold more than one color for a given map.

The talk on stylization and abstraction of photographs by Doug DeCarlo and Anthony Santella opened with the now-familiar image of a woman sitting on the street that graces the cover of this year's ACM Conference Proceedings. The pair utilized eye tracking information to infer the critical focus of photographic images, and uses this information to determine the degree of detail and size of edges to use when rendering the image.

The session closed with Alan Cheney's presentation of an Object-based Image Editing program. Using a photograph of Mr. Potato Head as a demonstration, Cheney illustrated various techniques to enable the grabbing and repositioning of distinct objects-- such as Mr. Potato Head's tongue-- and the structured background filling that automatically covers for the missing objects. Though the talk skipped over challenges such as shadows or non-uniform background patterns, Cheney and Barrett's work makes image editing far more intuitive to the user by breaking visual elements into what are commonly assumed to be separate objects.

Official Paper Session Description


 


Details on Authors, etc
 

NPR seems to be close to a mature technology. There is an NPAR Conference
 

And you see lots of NPR in TV commercials.

 

Maybe not lots, but, at least some.
 

 

This page is maintained by
Jan Hardenbergh
jch@siggraph.org
All photos you see in the 2002 reports are due to a generous loan of Cybershot digital cameras from SONY