Computer graphics processing and selective visual display system – Computer graphics processing – Three-dimension
Patent
1997-07-29
2000-03-07
Zimmerman, Mark K.
Computer graphics processing and selective visual display system
Computer graphics processing
Three-dimension
345426, 345430, 345434, G06T 1510
Patent
active
060346914
ABSTRACT:
The present invention is directed to a real-time controllable reflection mapping function which covers all stereoscopic directions of space. More specifically, the surface of a mirrored object is segmented into a plurality of polygonal elements (for example, triangles). Then, a polyhedron, which includes a predetermined point (for example, the center of the mirrored object) in a three-dimensional space (for example, a cube) in the interior thereof, is generated and a rendering process is performed for each surface of the polyhedron with the predetermined point as a view point. The rendered image is stored. Thereafter, a reflection vector is calculated between each vertex of the polygonal elements and a view point used when the entire three-dimensional space is rendered. Next, the surface of the polyhedron, in which an intersecting point between the reflection vector with the predetermined point as a start point and the polyhedron exists, is obtained. The coordinate in the image, which corresponds to each vertex of the polygonal elements, is calculated by using the surface where the intersecting point exists and the reflection vector. The image is texture-mapped onto the surface of the object by using the coordinate in the image which corresponds to each vertex of the polygonal elements. Finally, the result of the texture mapping is displayed.
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S. E. Chen, "QuickTime.RTM. VR--An Image-Based Approach to Virtual Environment Navigation", Computer Graphics Proceedings, Annual Conference Series, 1995, pp. 28-39.
A. Watt et al., "Chapter 8 Ray tracing I: basic recursive ray tracing, Chapter 9 Ray tracing II: practical ray tracing and Chapter 10 Ray tracing III: advanced ray tracing models", Advanced Animation and Rendering Techniques, Theory and Practice, 1992, pp. 219-265.
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Aono Masaki
Ohbuchi Ryutarou
Shimizu Kazuya
International Business Machines - Corporation
Nguyen Kimbinh T.
Sbrollini, Esq. Jay P.
Zimmerman Mark K.
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