Title:
【発明の名称】三次元空間中の物体を回転させるグラフィック表示方法及び装置
Document Type and Number:
Japanese Patent JPH07111743
Kind Code:
B2
Abstract:
A graphic display method and apparatus to improve the ease of operations by enabling a more direct operation for rotating an object in a three-dimensional space, and to make it possible to change the attitude of the object over a wide range of viewing points is provided. A semitransparent spherical surface 22 having as its centre O a fixed point in an object 21 being displayed on a screen of a tablet is generated so as to enclose the object 21. Then, three degrees of freedom for orientation are determined by pen-manipulation on the spherical surface 22. That is, a plurality of points (P0-P3) on the spherical surface 22 are specified in a predetermined order. For example, a rotation axis OP1 is specified by specification of points P0 and P1, and then a rotation angle alpha about this axis OP1 is specified by the specification of points P2 and P3. Then, calculations for rotating the object 2 to the specified orientation are performed, and the rotated object 21 is displayed. According to this procedure, the object 21 in the three-dimensional space can be rotated to an arbitrary orientation in a desired manner.
Inventors:
Makoto Ono
Hiroshi Minakata
Hiroshi Minakata
Application Number:
JP4730392A
Publication Date:
November 29, 1995
Filing Date:
March 04, 1992
Export Citation:
Assignee:
International Business Machines Corporation
International Classes:
G09G5/36; G06F3/033; G06F3/048; (IPC1-7): G06T17/40
Domestic Patent References:
| JP1106179A | ||||
| JP63187371A |
Attorney, Agent or Firm:
Hiroshi Sakaguchi (2 outside)
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