Title:
【発明の名称】三次元画像表示方法
Document Type and Number:
Japanese Patent JP2539369
Kind Code:
B2
Abstract:
PURPOSE:To reduce remarkably a necessary memory capacity by executing a point transformation from a more distant part than a visual point. CONSTITUTION:A distance between each point and a visual point is derived from the following expression. NRO=NEY-XcosEA*sinEB-YsinEA- ZcosEAcosEB. In this regard, X, Y and Z, NEY, EA, and EB denote points of a perspective transformation, a distance between a visual point and an origin, an angle made by the visual point and an XZ plane, and an angle made by an axis Z and a point projected to the XZ plane, respectively. Subsequently, each point is brought to the perspective transformation by the following expressions. NXP=XcosEB-ZsinEB and NYP=XsinEBsinEA-YcosEA+ ZcosEBcosEA. In this regard, NXP and NYP denote X and Y coordinates on the plane of projection. In this way, this system is operated at the speed being equal to a Z buffer algorithm which is used most at present, and also a necessary memory capacity can be reduced remarkably.
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Inventors:
SANO KOICHI
YOKOYAMA TETSUO
YOKOYAMA TETSUO
Application Number:
JP54986A
Publication Date:
October 02, 1996
Filing Date:
January 08, 1986
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G06T11/00; G06T15/08; G06T15/40; (IPC1-7): G06T15/00; G06T15/40
Domestic Patent References:
| JPS5962036A |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)