Non-Photorealistic Computer Graphics Library

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Found 13 item(s) authored by "John F. Hughes" .
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Proceedings A Suggestive Interface for 3D Drawing
Takeo Igarashi, John F. Hughes.
14th annual ACM symposium on User interface software and technology (UIST'01), pp. 173--181, Orlando, Florida, November 11-14, 2001. [BibTeX]

Proceedings An Interface for Sketching 3D Curves
Jonathan M. Cohen, Lee Markosian, Robert C. Zeleznik, John F. Hughes, Ronen Barzel.
Proceedings of the 1999 ACM Symposium on Interactive 3D Graphics, pp. 17--21, 1999. [BibTeX]

Proceedings Art-Based Rendering of Fur, Grass, and Trees
Michael A. Kowalski, Lee Markosian, J.D. Northrup, Lubomir D. Bourdev, Ronen Barzel, Loring S. Holden, John F. Hughes.
Proceedings of Siggraph 99, 1999. [BibTeX]

Proceedings Art-based Rendering with Continuous Levels of Detail

Author(s): Lee Markosian, Barbara J. Meier, Michael A. Kowalski, Loring S. Holden, J.D. Northrup, John F. Hughes.
Proceedings: 1st International Symposium on Non-Photorealistic Animation and Rendering (NPAR'00), pp. 59--66, Annecy, France, June 05 - 07, 2000.
[BibTeX] Find this paper on Google

Abstract:
In previous work [6], we presented an algorithm for rendering virtual scenes using art-based styles. We demonstrated the ability to render fur, grass, and trees in a stylized manner that evoked the complexity of these textures without representing all their components explicitly. We achieved this with stroke-based procedural textures that generated detail elements, or graftals, just as needed. Our implementation had several drawbacks. First, each new graftal texture required a procedural implementation that included writing code. Also, graftals were regenerated in each frame in a way that led to excessive introduction and elimination of graftals even for small changes in camera parameters. Lastly, our system provided no way to continuously vary the properties of graftals, including color, size, or stroke width. Such an ability could be used to achieve better frame-to-frame coherence, or more generally to animate graftals. In this paper, we present a new framework for graftal textures that addresses these issues. Our new framework allows all major decisions about graftal look and behavior to be specified in a text file that can be edited by a designer. We have achieved greater frameto- frame coherence by using graftals that remain in fixed positions on the model surface. The look and behavior of graftals as they appear or disappear can now be animated to create smooth transitions. Finally, we introduce the concept of tufts which manage the multiresolution behavior of graftals according to the specifications of the scene designer.

Proceedings Hardware-Determined Feature Edges
Morgan McGuire, John F. Hughes.
3rd International Symposium on Non-Photorealistic Animation and Rendering (NPAR'04), pp. 35-147, 2004. [BibTeX]

Proceedings Harold: A World Made of Drawings
Jonathan M. Cohen, John F. Hughes, Robert C. Zeleznik.
1st International Symposium on Non-Photorealistic Animation and Rendering (NPAR'00), pp. 83--90, Annecy, France, June 05 - 07, 2000. [BibTeX]

Proceedings Multiperspective Panoramas for Cel Animation
Daniel Wood, Adam Finkelstein, Craig E. Thayer, John F. Hughes, David H. Salesin.
SIGGRAPH '97, pp. 243--250, Aug, 1997. [BibTeX]

Proceedings Orientable Textures for Image-Based Pen-and-Ink Illustration
Michael P. Salisbury, Michael Wong, John F. Hughes, David H. Salesin.
SIGGRAPH '97: Proceedings of the 24th annual conference on Computer graphics and interactive techniques, pp. 401--406, New York, NY, USA, ACM Press/Addison-Wesley Publishing Co., 1997. [BibTeX]

Proceedings Rapid Approximate Silhouette Rendering of Implicit Surfaces
David J. Bremer, John F. Hughes.
Proceedings of Implicit Surfaces '98, pp. 155--164, June, 1998. [BibTeX]

Proceedings Real-Time Nonphotorealistic Rendering
Lee Markosian, Michael A. Kowalski, Samuel J. Trychin, Lubomir D. Bourdev, Daniel Goldstein, John F. Hughes.
ACM Siggraph 97, Annual Conference Series 1997, pp. 415--420, August, 1997. [BibTeX]

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