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摘要: OpenCASCADE Code Study Outline.
OpenCASCADE Collaborative development portal
Updating……
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摘要: Abstract. BRep short for Boundary Representation. First give the definition of the BRep, then compare the BRep mode between OpenCASCADE and OpenNURBS. There are 3 main representation method: use face/edge/vertex to keep track all information in the solid model. The winged-edge data structure uses edges to keep track all information in the solid model. The paper focus on the BRep of OpenCASCADE and OpenNURBS.
Key Words. OpenCASCADE, BRep, OpenNURBS, The Winged-edge Structure, 阅读全文
摘要: Abstract. The openNURBS Toolkit consists of C++ source code for a library that will read and write a openNURBS 3D model file(.3dm). More than 400 software development teams and applications including Rhinoceros, exchange 3-D models using the openNURBS (.3dm) file format. But there is no a simple viwer for 3dm on PC except Rhinoceros. So I want to develop a 3DM viewer based on OpenSceneGraph to visualize the 3DM file.
Key Words. OpenNURBS, 3DM Viewer, OpenSceneGraph 阅读全文
摘要: Abstract. The OpenNURBS initiative provides CAD/CAM/CAE and computer graphics software developers the tools to accurately transfer 3D geometry between applications. The OpenNURBS C++ source code is clean and fairly simple. The OpenNURBS Toolkit is intended for use by C++ and .NET programmers. The toolkit includes complete source code to create a library that will read and write 3dm files. OpenCASCADE providing services for 3D surface and solid modeling, CAD data exchange, and visulization. Most 阅读全文
摘要: 有一天你将破蛹而出，成长得比人们期待的还要美丽。
但这个过程会很痛，会很辛苦，有时候还会觉得灰心。
面对着汹涌而来的现实，觉得自己渺小无力。
但这，也是生命的一部分。做好现在你能做的，然后，一切都会好的。
我们都将孤独地长大，不要害怕。
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摘要: Abstract. A root-finding algorithm is a numerical method, or algorithm, for finding a value x such that f(x)=0, for a given function f. Such an x is called a root of the function f. In OpenCASCADE math package, implemente Newton-Raphson method to find the root for a function. The algorithm can be used for finding the extrema value for curve or surface, .i.e Point Inversion, find the parameter for a point on the curve or surface. The paper focus on the usage of OpenCASCADE method and its applicat 阅读全文
摘要: Abstract. DWG is a file format created in the 70’s for the emerging CAD applications. Currently it is the native file format of AutoCAD, a proprietary CAD program developed by Autodesk. Libredwg is a free C library to read and write DWG files. This program is part of GNU project, released under the aegis of GNU. The paper focus on the usage of Libredwg, and use the Libredwg to read a DWG file and output the entities of the DWG to Tcl script for OpenCASCADE Draw Test Harness visualization.
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摘要: Abstract. The conic sections and circles play a fundamental role in CAD/CAM applications. Undoubtedly one of the greatest advantages of NURBS is their capability of precisely representing conic sections and circles, as well as free-form curves and surfaces. We assume a knowledge of conics and circles, the purpose of this paper is to study them in the framework of their representation as NURBS curves.
Key Words. OpenCASCADE, Conic Curves, Circle, Convert, BSpline Curve 阅读全文
摘要: Abstract. Rational Bezier Curve can represent conic curves such as circle, ellipse, hyperbola, .etc. But how to convert a conic curve to BSpline curve is still question, i.e. Represent a conic curve in BSpline form. The key point of Hyperbola conversion is to calculate the 2nd pole and its weight factor. The paper focus on the hyperbola convert to the BSpline curves.
Key Words. OpenCASCADE, Convert, Hyperbola, BSplineCurve, Conic Curve 阅读全文
摘要: Abstract. Rational Bezier Curve can represent conic curves such as circle, ellipse, hyperbola, .etc. But how to convert a conic curve to BSpline curve is still question, i.e. Represent a conic curve in BSpline form. Parabola curve is the most simple conic curve, that the parabola does not require rational functions. Let’s begin from the simplest one...
Key Words. OpenCASCADE, Convert, Parabola, BSplineCurve, Conic Curve 阅读全文
摘要: Abstract. When you are familiar with OpenCASCADE on Windows, you should try it on Linux operating system, because of Debian is also open source like OpenCASCADE. The paper is focus on how to building the OpenCASCADE on Debian.
Key Words. OpenCASCADE, Linux, Debian, Building 阅读全文
摘要: Debian是OpenCASCADE用于Linux操作系统测试的专用系统。这几天下载安装了Debian系统，体验了一下，感觉还不错：简洁，精致。
解决了这些问题后，Debian用起来感觉还好，还需要慢慢熟悉和适应。下一步准备在Debian上编译、调试C/C++程序。为编译OpenCASCADE的Linux版本打下基础。 阅读全文
摘要: Abstract. Use the Draw Test Harness to test the performance of OpenCASCADE by Tcl scripts. From the test result, you will check whether the OpenCASCADE meet your need.
Key Words. OpenCASCADE, Performance Test, Draw Test Harness, Tcl/Tk, 性能测试 阅读全文
摘要: Abstract. The color scale is a specialized label object that displays a color map and an accompanying numerical scale for color mapped or contour data plots. As the geometry modeling kernel of SALOME, OpenCASCADE provides the color scale function. The paper focus on the usage of color scale in OpenCASCADE.
Key Words. OpenCASCADE, Color Scale, 应力云图, 颜色映射表 阅读全文
摘要: Abstract. Although polynomials offer many advantages, there exist a number of important curve and surface types which cannot be represented precisely using polynomials, e.g., circles, ellipses, hyperbolas, cylinders, cones, spheres, etc. So we introduce the concepts of rational curves and homogeneous coordinates to solve the problem. To understand rational curves in a homogenous coordinate system is more straightforward. If you define irrational Bezier curves in 4D space and then project them ba 阅读全文
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