Patent
1993-09-13
1996-07-16
Powell, Mark R.
395121, G06F 1500
Patent
active
055375200
ABSTRACT:
A method and system for displaying a three-dimensional object without requiring depth sorting of polygons or z-buffer calculation. The three-dimensional space is divided into rectangular parallelepipeds and tetrahedrons. A determination of the depth order of the rectangular parallelepipeds and tetrahedrons is made based on a view vector. The rectangles and tetrahedrons are then processed in order of depth from the furthest from the view point to the nearest. As each tetrahedron is processed, geometric data of a polygon containing the iso-valued surface is determined, the intensity of illumination calculated and the polygon data transferred to the display apparatus for display. The method and system of the present invention avoid the need for large memories to store intermediate data.
REFERENCES:
patent: 4710876 (1987-12-01), Cline et al.
patent: 4719585 (1988-01-01), Cline et al.
patent: 4821210 (1989-04-01), Rumbaugh
"A Novel Triangular Method of Equi-Valued Surface Based on Tetrahedral Grids", TRL Research Report TR 87-1017, Dec. 14, 1987, Tokyo Research Lab, IBM Japan Ltd, A. Koide et al.
"Polyhedral Approximation Approach to Molecular Orbital Graphics", Journal of Molecular Graphics, vol. 4, No. 3, Sep. 1986, pp. 149-159, A. Koide et al.
Doi Akio
Koide Akio
Huynh B.
International Business Machines - Corporation
Powell Mark R.
Walker Mark S.
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