Shading apparatus for displaying three dimensional objects

Details Shading apparatus for displaying three dimensional objects Shading apparatus for displaying three dimensional objects

1985-08-19

1987-11-24

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340728, 340747, 364522, G09G 106

Patent

active

047092319

ABSTRACT:
An apparatus for shading a polyhedron at high speed is disclosed which includes the combination of a polygon-scan line conversion processor and an inner product interpolation processor for obtaining a pair of inner products of vectors indicative of a relation among the direction of a normal, the direction of a light source and the direction of a view point each viewed at a point within a polygon having a plurality of vertices, on the basis of the position of said point in the polygon and the direction of a normal at each of the vertices, a table searched on the basis of the inner products of vectors and holding a series of brightness data which have previously been calculated for a series of values of each of the inner products of vectors, a buffer for storing the result of table search for the above table, and a D/A conversion circuit for converting the result of table search into a signal which is used as a brightness control signal in a display device.

REFERENCES:
patent: 4475104 (1984-10-01), Shen
patent: 4586038 (1986-04-01), Sims et al.
patent: 4615013 (1986-09-01), Yan et al.
Bui Tuong Phong, "Illumination for Computer Generated Pictures", Communication of ACM, 18(6), Jun. 1975, pp. 311 to 317.
J. D. Foly and A. Van Dam, "Fundamentals of Interactive Computer Graphics", Addison Wesely Publishing Company.
James F. Blinr, "Models of Light Reflection for Computer Synthesized Pictures", SIGGRAPH '77 Proceeding.

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