Three-dimensional display apparatus

Details Three-dimensional display apparatus Three-dimensional display apparatus

1990-08-31

1993-01-05

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

395119, G09G 106

Patent

active

051774747

ABSTRACT:
A calculator calculates projection coordinates of principal vertexes of a displayed object with respect to a projection plane from a visual point. An evaluation device evaluates whether surfaces of the object which are determined by the principal vertexes are visible or invisible from the visual point. A result of the evaluating by the evaluation device is indicated. A memory stores information of a position of a predetermined virtual operation plane. A pointing device is movable on an actual operation plane. A calculator connected to the memory and the pointing device calculates a correspondence point on the virtual operation plane which corresponds to a position of the pointing device when the pointing device moves on the actual operation plane. A calculator calculates a half line which starts from the correspondence point and which intersects with the virtual operation plane at a predetermined angle. A setting device sets the predetermined angle. A calculator calculates a point of an intersection between the half line and the displayed object. A calculator calculates projection coordinates of at least part of the half line with respect to the projection plane. The calculated projection coordinates of at least part of the half line are indicated.

REFERENCES:
patent: 4745405 (1988-05-01), Himelstein et al.
patent: 4808979 (1989-02-01), DeHoff et al.
patent: 4812829 (1989-03-01), Ebina et al.
patent: 4835528 (1989-05-01), Flinchbaugh

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