发明名称 |
Shading apparatus for displaying three dimensional objects |
摘要 |
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.
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申请公布号 |
US4709231(A) |
申请公布日期 |
1987.11.24 |
申请号 |
US19850766941 |
申请日期 |
1985.08.19 |
申请人 |
HITACHI, LTD. |
发明人 |
SAKAIBARA, TORU;TSUJIOKA, SHIGEO;KAJIURA, TOSHINORI;AOSHIMA, TOSHIHISA;TONOMURA, MOTONOBU |
分类号 |
G06F3/153;G06T1/00;G06T15/80;G09G5/02;G09G5/36;(IPC1-7):G09G1/06 |
主分类号 |
G06F3/153 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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