The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1995
Filed:
Nov. 03, 1992
Hiroshi Kadota, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
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.