Rendering a two-dimensional image

Details Rendering a two-dimensional image Rendering a two-dimensional image

1999-10-04

2003-08-19

Nguyen, Phu K. (Department: 2671)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

Reexamination Certificate

active

06608627

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to rendering a two-dimensional (“2D”) image from data for a three-dimensional (“3D”) model.
There are different types of 2D images. For example, gouraud-shaded 2D images are shaded in a way to simulate real-world photorealistic lighting. By contrast, one style of non-photorealistic 2D images are “flat”, cartoon-like images. In traditional animation, such images are drawn on cels, often by hand. Each time a new perspective of a 3D model is required, an entirely new image is redrawn on a new cel. Recently, animators have begun to use computers to render non-photorealistic 2D images.
SUMMARY OF THE INVENTION
In general, in one aspect of the invention, a 2D image is rendered from data for a 3D model by detecting silhouette features on the 3D model, and rendering the silhouette features to produce the 2D image.
Among the advantages of the invention are one or more of the following. 2D images, such as nonphotorealistic images, can be rendered for any position and view of the 3D model. Therefore, once data has been generated for the 3D model, the same 3D data can be used to produce any number of 2D images. For example, the 3D model can be positioned, and a 2D image rendered for that position. The same 3D model can then be repositioned, and a new 2D image rendered for the new position, using the same 3D data. A hash table may be used during load-time of a model to decrease the amount of time it takes to find edges of the model, and thus decrease processing time overall.


REFERENCES:
patent: 6115050 (2000-09-01), Landau et al.
Foley, Computer Graphics Principles and Practice, 1995, Addison-Wesley, 2ndEdition, chapter 15.2.4, p. 663-664.*
Markosian, Lee et al. Real-Time Nonphotorealistic Rendering. Siggarph 1998.
Appel, Arthur. “The Notion of Quantitative Invisibility and the Machine Rendering of Solids.” Proceedings of 22nd National Conference Association for Computing Machinery 1967.
Zeleznik, Robert C. “SKETCH: An Interface for Sketching 3D Scences.” Computer Graphics Proceedings 1996.

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