Past studies

Recent research has introduced here is.

Research Introduction of a logarithmic curve aesthetic here is.

• Study of current CAD systems, CAD systems are widely used three-dimensional, has become an integral part of product design. However, to build a CAD system is very difficult, to create a kernel core manufacturer of CAD system has been decreasing year by year. To the difficulty of building a CAD system, but there are several reasons, one of them is a matter of errors associated with numerical computation.

  Numerical calculation in the computer because it involves the error, inconsistency in the position of the object relationship (for example, at the bottom and at the same time there is a vertex on the upper side of the plane) may will arise. Therefore, it is possible not only can not get the correct three-dimensional shape, the system can fail.

  By the solid completely stable polyhedral set operations (operations with integer data type with variable length data) for this problem based on integer arithmetic (as a matter of four-dimensional method to solve the problem of 3-D) homogeneous processing I went over to the study of the technique.

  · N. Yoshida, M. Shiokawa, and F. Yamaguchi:. Solid Modeling Based on a New Paradigm, Computer Graphics Forum (Eurographics), Vol 13, No.3, pp.55-64, 1994.

  Although complete stabilization can be achieved by integer arithmetic, integer arithmetic is not efficient because compared to the floating-point arithmetic, needs to be designed on the calculation. Many geometric algorithms, we conducted research on the adaptive code determining process may be required to focus on only the sign of the expression rather than the values ​​themselves, to determine only the sign of the expression efficiently.

  ４×４行列式法における適応的符号判定処理（第２報） - 同次多項式の符号判定処理- , 精密工学会誌 , Vol. 62, No. 9, pp.1267-1271, 1996. Norimasa Yoshida, forests, Lowe, K. Sakane, constant tree Saika, Fujio Yamaguchi (Part 2): Adaptive coding method determination process matrix formula 4 × 4 - the sign of the determination process homogeneous polynomial -, Journal of Precision Engineering, Vol. 62, No. 9, pp.1267-1271, 1996.

  Or more, but is intended for the polyhedron, we have also exploratory study to use multivariate Sturm sequence to determine the intersection of the curved surface. In this technique, you can do exactly the intersection of curves and surfaces.

  多変数 Sturm 列を利用した曲線・曲面の交点の存在判定 , 精密工学会誌 , Vol. 67, No. 3, pp.498-502, 2001. · Toshiya Yamauchi, Norimasa Yoshida, Fujio Yamaguchi:.. Determine the presence of the intersection of curves and surfaces using multivariate Sturm column, Journal of Precision Engineering, Vol 67, No 3, pp.498-502, 2001.

  For these studies, and some have achieved further improve the system Journal of Precision Engineering a method to compute efficiently and accurately to take advantage of floating-point unit sign of the expression matrix 4 × 4 In addition, The Visual Computer magazine was to be published. These studies are in the process of research and Dr Toshiya Yamauchi your junior Yamaguchi laboratory.
  

• In recent years research on the efficient display of large-scale models, large-scale models of more than hundreds of thousands of polygons has appeared with the development of three-dimensional laser scanner. In this study, we conducted research to adaptively and efficiently display large-scale models depending on the visibility. In specific terms, it is to simplify the part that is outside the field of view, with respect to part of the inside of the view that to simplify somewhat the flat part of the borders to look in detail. Changing the point of view, the state of the polygon model, but changes dynamically, is what people have seen that look in much the same way. Itself this approach, but has been proposed by Hoppe, show a high adaptive depends on the visibility and significantly reduces the time of pre-processing by using the method simplifies high-speed using distance squared error was.

  Norimasa Yoshida,, Hiroshi Kitajima Katsu: an adaptive display depends on the view that target the polygon model, Journal of Electronics, Information and Communication Engineers, D-II, Vol.J83-D-II, No.6, pp.1507-1515, , 2000.

  

  Video, page here please visit.

• To create a three-dimensional shape deformation inside the computer research on interactive systems, and requires effort. Made a research on the design as a tool for polygonal models, perform interactive shape deformation. In this theory, the deformation can be performed freely by specifying the range to specify the location of any effect that you want to deformation, want to further deformation. Showed that the shape of the bucket seat of the car, such as available from a simple model that can be created, such as a sphere.

  Norimasa Yoshida-, Kenichiro field Takeshi, Hiroshi Kitajima Katsu:.. Proposal of design tools based on the deformation space the big picture design, Journal of Precision Engineering, Vol 69, No.4, pp 559-563, 2003.
  

Yoshida laboratory is a laboratory that was established in April 2003. We would as a result of the laboratory is not yet, please find a warm and when can watch.