Title:
CADシステム及びCADプログラム
Document Type and Number:
Japanese Patent JP4301791
Kind Code:
B2
Abstract:
There is provided a computer aided design system and a computer aided design program which can greatly increase the utility value of a computer aided design model, and can improve the efficiency of design and production processes, by adopting a curved surface theory which ensures the continuity of a free-form line/free-form surface. A computer executes: a point sequence information extraction process for extracting a plurality of point sequences on a curved surface; a dividing process for generating a curved surface from the point sequences using another computer graphics program, and dividing the curved surface into a predetermined number of meshes; a first fundamental form computing process for computing coefficients of the first fundamental form defined by a tangent vector which forms a tangent plane of the mesh; a second fundamental form computing process for computing coefficients of the second fundamental form defined by the tangent vector and a normal vector of the mesh; and a storage process for storing the point sequence information, the coefficients of the first fundamental form and the coefficients of the second fundamental form.
Inventors:
Masami Miura
Takayuki Kono
Yuichi Sasaki
Takeshi Nakahama
Yasuhiko Yoshida
Takayuki Kono
Yuichi Sasaki
Takeshi Nakahama
Yasuhiko Yoshida
Application Number:
JP2002292585A
Publication Date:
July 22, 2009
Filing Date:
October 04, 2002
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
PAL Structure Co., Ltd.
Cytec Co., Ltd.
PAL Structure Co., Ltd.
Cytec Co., Ltd.
International Classes:
G06F17/50
Domestic Patent References:
| JP11195139A | ||||
| JP7085314A | ||||
| JP11065628A |
Attorney, Agent or Firm:
Ryuichiro Mori
Masatake Shiga
Tadashi Takahashi
Hideaki Sato
Tetsuo Yamazaki
Masatake Shiga
Tadashi Takahashi
Hideaki Sato
Tetsuo Yamazaki