芸術科学会論文誌 投稿用カバーシート

■ 論文種類（以下のうちから一つ選択）
  ・原著論文 フルペーパー    

■ 論文分野（1)〜3)のうちから一つ選択）
  2) 科学系分野

■ カテゴリ（1個以上選択）
  a-1) CG技術(モデリング)
  a-5) CAD/CAE/CAM

■ 該当特集（以下のうちから一つ選択）
  ・特集名「2010 NICOGRAPH International・春季大会・芸術科学会展発表論文特集」

■ 論文題名(和文、英文)
  Curve Mesh Modeling Method of Trimmed Surfaces for Direct Modeling
  
■ 著者名(和文、英文)
  村木 祐太(非会員)*1，今野 晃市(正会員)*1，徳山 喜政(正会員)*2
  Yuta MURAKI*1, Kouichi KONNO*1, Yoshimasa TOKUYAMA*2

■ 著者所属(和文、英文)
  *1 岩手大学工学部  *2 東京工芸大学工学部
  *1 Faculty of Engineering, Iwate University  *2 Faculty of Engineering, Tokyo Polytechnic University

■ 著者e-mail
  murakiyuta@lk.cis.iwate-u.ac.jp, 
  konno@cis.iwate-u.ac.jp，
  tokuyama@image.t-kougei.ac.jp

■ 連絡担当者の氏名、住所、所属、電話、Fax、e-mail
　氏名：村木 祐太
　住所：岩手県盛岡市上田4-3-5
　所属：岩手大学工学研究科
　電話：019-621-6476
　Fax：019-621-6476
　e-mail：murakiyuta@lk.cis.iwate-u.ac.jp

■ 論文概要(和文400字程度、英文100ワード程度)
Abstract
In the shape modeling with 3D CAD systems, the trimmed surface is quite popular. 
For instance, Japanese Industrial Standards (JIS) models contain a lot of notches, expressed using trimmed surfaces. 
Since trimmed surfaces are directly modified in direct modeling, it has a big restriction in the shape modification. 
It is effective to apply a new free-form surface to a closed region composed of the modified edges 
because the consistency of a trimmed surface can be maintained. 
This paper proposes the method of fitting a free-form surface by using the offset curve. 
To be more concrete, an offset curve is generated according to the tangent planes and a point cloud is generated. 
After that, a B-spline surface is generated using the generated point clouds and the boundary curves, so that a new trimmed surface is generated. 
Our method is effective for direct modeling that directly modifies the boundary edges of the trimmed surface representing a notch shape.

■ キーワード(和文5個程度、英文5個程度)
Direct Modeling, Trimmed Surface, Surface Fitting, Offset Curve, Notch Shape