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摘要: Abstract. OpenCASCADE linear extrusion surface is a generalized cylinder. Such a surface is obtained by sweeping a curve (called the “extruded curve” or “basis”) in a given direction (referred to as the direction of extrusion and defined by a unit vector). The u parameter is along the extruded curve. The v parameter is along the direction of extrusion. The form of a surface of linear extrusion is generally a ruled surface. It can be a cylindrical surface, or a planar surface.
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摘要: Abstract. The sphere is the simplest topology shape of the BRep structure. But there are several import concept of the sphere edges, such as degenerated edge and seam edge. So construct a sphere by code, you will learn these.
Key Words. OpenCASCADE, Sphere, BRep 閱讀全文
摘要: Abstract. By making a simple box to demonstrate the BRep data structure of the OpenCASCADE. The construction method is different from BRepPrimAPI_MakeBox. In the paper construct the box from vertex, edge to solid, while in BRepPrimAPI_MakeBox from solid, shell to vertex. From the construction, the BRep data structure in OpenCASCADE also can be called the Winged-Edge data structure.
Key Words. OpenCASCADE, BRep, Box, The Winged-Edge Structure 閱讀全文
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, 閱讀全文
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 閱讀全文
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 閱讀全文
摘要: 有一天你將破蛹而出，成長得比人們期待的還要美麗。
但這個過程會很痛，會很辛苦，有時候還會覺得灰心。
面對著洶涌而來的現實，覺得自己渺小無力。
但這，也是生命的一部分。做好現在你能做的，然后，一切都會好的。
我們都將孤獨地長大，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 閱讀全文
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 閱讀全文
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 閱讀全文
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 閱讀全文
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 閱讀全文
摘要: Debian是OpenCASCADE用于Linux操作系統測試的專用系統。這幾天下載安裝了Debian系統，體驗了一下，感覺還不錯：簡潔，精致。
解決了這些問題后，Debian用起來感覺還好，還需要慢慢熟悉和適應。下一步準備在Debian上編譯、調試C/C++程序。為編譯OpenCASCADE的Linux版本打下基礎。 閱讀全文
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