Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Reexamination Certificate
1999-10-04
2003-07-15
Padmanabhan, Mano (Department: 2671)
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
C345S423000
Reexamination Certificate
active
06593924
ABSTRACT:
COPYRIGHT NOTICE
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BACKGROUND OF THE INVENTION
This invention relates to rendering a non-photorealistic (“NPR”) image from an original model.
NPR rendering is a process in which a three-dimensional (“3D”) model is rendered as a two-dimensional (“2D”) image with shading that is non-photorealistic. There are many methods of rendering non-photorealistically. One of these methods produces a 2D cartoon-like effect, in contrast to photorealistic shading, such as gouraud or phong shading, which produces a 3D effect.
Traditional animation techniques involve drawing 2D images on cels, often by hand. Each time a new perspective of the original 3D model is required, an entirely new image is drawn on a new cel. Recently, computers have been used in the animation process.
SUMMARY OF THE INVENTION
In general, in one aspect of the invention, a method for use in rendering an NPR image from an original (e.g., 3D) model, selects a normal in the original model and substitutes a vector for the normal to produce an NPR image corresponding to the original model.
Among the advantages of the invention are one or more of the following. Substituting vectors for normals in the NPR image alters the shading of the NPR image. For example, the shading of the NPR image can be altered so that the image does not appear photorealistic. NPR images, such as cartoon images, can thus be rendered and shaded for any perspective of the original model. For example, an original model can be positioned, and a shaded NPR image rendered for that position. The original model can then be repositioned and a shaded NPR image rendered for the new position.
Other advantages and features will become apparent from the following description and the claims.
REFERENCES:
Foley et al (Computer Graphics: Principles and Practice: second Edition in C: 1997: p. 1102).*
Markosian et al (“Real-Time Nonphotorealistic Rendering”: Proceedings of the 24th annual conference on Computer Graphics and Interactive techniques, Aug. 1997).*
Chow ( Optimized geometry Compression for Real-Time Rendering): Proceedings Visualization 1997, IEEE.*
Zeleznik et al (Sketch: An Interface for Sketching 3D Scenes: 1996 ACM).*
Elber (Line Art Rendering via a Coverage of isoparametric Curves: IEEE 1995).*
Taubin et al., “3D Geometry Compression.” SIGGRAPH '98 Course Notes, 1998, (Index).
Deering, “M. Geometry Compression.” Computer Graphics. SIGGRAPH '95, 1995, pp 13-20.
Catmull et al. “Recursively Generated B-Spline Surfaces on Arbitrary Topological Meshes.” Computer Aided Geometric Design, vol. 10, No. 6, 1978.
Lake Adam T.
Marshall Carl S.
Rosenzweig Michael S.
Fish & Richardson P.C.
Intel Corporation
Padmanabhan Mano
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