Research instruments of development geometric modeling system
Introduction
Geometric modeling systems are an indispensable component in many industrial sectors of human activity.
A comprehensive computerization of engineering at all stages of the life cycle of products is necessary.
Best known for such systems as AutoCAD, 3D MAX, SolidWorks. They all have their own advantages and
disadvantages. Each system has great functionality, but the licensed copy of the product is expensive.
Often the purchase of such a system is disadvantageous because it uses only a small part of its
functionality. In this case advantageous to develop your own graphical system. However, it takes a lot of
time to develop their own classes, writing the functions to work with graphic objects, etc. Therefore is
advantageous to use the existing graphics library. They will be discussed in this article.
Actuality of theme
The relevance of this work is the need to reduce time spent on the development of geometric
modeling system.
Purpose and tasks
The purpose of this work is to create a visual design environment. Its use greatly accelerates the process
of development the geometric modeling systems.
Main objectives:
- study of existing instruments for the development of the geometric modeling systems;
- analysis of these systems and the provision of the basic advantages and disadvantages of each of
them to identify the optimal structure of the system developed;
- development of the visual environment design of this structure.
The novelty of the work
The novelty of the work consists in applying a new method in designing graphical systems. This method
is to use visual development environment. In this environment, the most common blocks of code are
represented as graphical objects. At the moment all the facilities to develop systems of geometric modeling
are presented in the form of graphics kernel. This is not always convenient. A system is also a graphical
kernel, but its function is not used directly, but through the visual environment.
An analysis of achievements and publications
There are three types of kernel: licensed kernels, private and the kernels available in the source
code [1].
Licensed geometric modeling kernels developed by one company, which licenses them to other companies
for their CAD-systems. Among this kernels include Parasolid (UGS) and the ACIS 3D Geometric Modeler
(Spatial / Dassault Systemes). The use of such kernel in this case is not advisable in view of their
high cost.
Private geometric modeling kernels developed by the creators of CAD-systems exclusively for their own
purposes and the use of such kernels are not possible. Examples of such kernels are Thinkdesign kernel
(think3 Inc.) and VX Overdrive (Varimetrix Corp.).
The kernels available in the source code is also being developed and maintained by one company, after
which they are licensed to other companies for use in CAD-applications. However, the developers of these
kernels provide their source code. This is very convenient for users who have the development team.
Using these kernels provides a sufficiently large number of features for most applications. These are
the kernels of Open CASCADE (Matra Datavision) and SMLib (Solid Modeling Solutions).
In [2] examined the problems associated with the construction of learning systems of geometric modeling.
Later it was decided to create a system that is described in [3]. Conclusions are made about creating
the instruments that allows to reduce the time spent in the construction of similar systems, using the
accumulated skills and knowledge. In [4] described functional developed kernel, considered the problems
encountered while building the kernel. On the basis of the kernel was developed a system that described
in [5]. Its main task is to construct three-dimensional representations of complex drawings for
educational. Visual development environment for geometric modeling system is designed to simplify the
use of the kernel and to reduce the time spent to explore the possibilities of kernel.
Creating a visual environment
At this stage of development created graphical kernel that contains classes for working with geometric
objects like point, line, circle, ellipse, spline, and the functions to work with these objects. The
development of the kernel was used the structure of kernel that close to the Open CASCADE, described
in [6].
Application of visual environment
To demonstrate the capabilities of the visual environment we describe the graphical system for
building three-dimensional representations of complex drawings.
Figure 1 shows the solution to the problem of finding the perpendicular to the plane defined
by three points in this system.
Fig.1 Finding the perpendicular to the plane defined by three points
(animated image, 15 frames, delay 100 ms, was done in MP Gif Animator)
Conclusions
Using a combination of visual components and functions of the kernel allows you to get rid of the
long routine while creating the graphic interface for system and reduce the time spent on the
construction of the system.
Use visual development environment is great. This system can be used for educational purposes,
and in the fabrication.
The plan on the future is improvement of the environment, increasing its functionality, modification
of the interface to maximize the convenience of the user environment.
Literature
1. Обзор ядер геометрического моделирования // Сайт поддержки пользователей САПР под редакцией
Виктора Ткаченко [электронный ресурс]:
http://www.cad.dp.ua/obzors/karnel.php
2. Карабчевський В.В. Засоби розробки навчальних систем для курсу “Інженерна графіка”
// Прикладна геометрія та інженерна графіка. Міжвідомчий науково-технічний збірник. Випуск 71.
Київ: КНУБА. – 2002. – С. 195-200.
3. Карабчевский В.В., Хлепитько И.В. Графический редактор для работы с параметризованными двумерными
объектами // Матеріали III наукової конференції молодих учених та студентів «Інформатика та комп’ютерні
технології». Донецьк: ДонНТУ. – 2007. – С. 278-280.
4. Карабчевский В.В., Хлепитько И.В. Разработка проблемно-ориентированных систем геометрического
моделирования Наукові праці Донецького національного технічного університету. Серiя "Проблеми
моделювання та автоматизації проектування динамічних систем" (МАП-2007). Випуск: 6 (127) - Донецьк:
ДонНТУ. - 2007. – С. 234-239.
5. Карабчевський В.В., Хлепітько І.В. Засоби розробки систем геометричного моделювання. Наукові нотатки.
Міжвузівський збірник (за напрямом «Інженерна механіка»). Випуск 22. Частина 1. «Сучасні проблеми
геометричного моделювання (квітень, 2008). – Луцьк, 2008. – С. 133-137.
At the time of writing this abstract master's work is not finished. The final version can be
received from the author or its curator after January 1, 2010.
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