随笔分类 - 4. OpenCascade / 2. ModelingData
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
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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
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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
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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
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摘要：Abstract. AVEVA Review is used to 3D model visualization for plant or ship design, construction and operation. Taking data from a range of 3D design systems, AVEVA Review delivers a virtual reality view of a plant or ship which users from all disciplines can freely navigate to view areas of interest, communicate ideas or undertake reviews. Use AVEVA .Net can extract model from DESIGN database, and use AnyCAD .Net can visualize the model. This paper mainly focus on the usage of AnyCAD .Net, and a
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摘要：摘要Abstract：本文简要介绍了适配器模式（adapter pattern），并结合程序实例对OpenCascade中的拓朴与几何的适配器的使用进行说明。
关键字Key Words：OpenCascade、BRep、Topology、Geometry、Adapter
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摘要：Abstract. BRep is short for Boundary Representation. Boundary Representation gives a complete description of an object by associating topological and geometric information for solid modeling. In this case, objects are described by their boundaries. There are two types of information in BRep: Topological information and Geometric information. This paper is concerned with the Cone BRep in OpenCascade, and also show how to use Tcl script to dump cone BRep info.
Key words. OpenCascade, BRep, Boun
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摘要：Abstract. BRep is short for Boundary Representation. Boundary Representation gives a complete description of an object by associating topological and geometric information for solid modeling. In this case, objects are described by their boundaries. There are two types of information in BRep: Topological information and Geometric information. This paper is concerned with the Torus BRep in OpenCascade, and also show how to use Tcl script to dump torus BRep info.
Key words. OpenCascade, BRep, B
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摘要：Abstract. BRep is short for Boundary Representation. Boundary Representation gives a complete description of an object by associating topological and geometric information for solid modeling. In this case, objects are described by their boundaries. There are two types of information in BRep: Topological information and Geometric information. This paper is concerned with the Cylinder BRep in OpenCascade, and also show how to use Tcl script to dump cylinder BRep info.
Key words. OpenCascade, BR
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摘要：Abstract. BRep is short for Boundary Representation. Boundary Representation gives a complete description of an object by associating topological and geometric information for solid modeling. In this case, objects are described by their boundaries. There are two types of information in BRep: Topological information and Geometric information. This paper is concerned with the sphere BRep in OpenCascade, and also show how to use Tcl script to dump sphere BRep info.
Key words. OpenCascade, BRep,
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摘要：Abstract. BRep is short for Boundary Representation. Boundary Representation gives a complete description of an object by associating topological and geometric information for solid modeling. In this case, objects are described by their boundaries. There are two types of information in BRep: Topological information and Geometric information. This paper is concerned with the Box BRep in OpenCascade, and also show how to use Tcl script to dump box BRep info.
Key words. OpenCascade, BRep, Bounda
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摘要：摘要Abstract：本文简要介绍了几何造型中的边界表示法（BRep），并结合程序说明OpenCascade中的边界表示的具体实现，即拓朴与几何的联系。对具有几何信息的拓朴结构顶点（vertex）、边（edge）、面（face）进行了详细说明。本文通过ACIS与OpenCascade进行对比来对拓朴（Topology）的概念进行说明。并通过示例程序，说明如何在OpenCascade中取得与一个拓朴对象相连的其他拓朴对象，包括父对象和子对象。
关键字Key Words：OpenCascade、ACIS、BRep、Topology、Geometry
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摘要：摘要Abstract：本文简要介绍了几何造型中的边界表示法（BRep），并结合程序说明OpenCascade中的边界表示的具体实现，即拓朴与几何的联系。对具有几何信息的拓朴结构顶点（vertex）、边（edge）、面（face）进行了详细说明。本文仅对面（Face）进行说明。
关键字Key Words：OpenCascade、BRep、Topology、Geometry、Face
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摘要：摘要Abstract：本文简要介绍了几何造型中的边界表示法（BRep），并结合程序说明OpenCascade中的边界表示的具体实现，即拓朴与几何的联系。对具有几何信息的拓朴结构顶点（vertex）、边（edge）、面（face）进行了详细说明。本文只对拓朴边数据进行说明，着重介绍了OpenCascade中两个种特别的边缝合边（seam edge）和退化边（degenerated edge）。
关键字Key Words：OpenCascade、BRep、Topology、Edge、Geometry
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摘要：摘要Abstract：本文简要介绍了几何造型中的边界表示法（BRep），并结合程序说明OpenCascade中的边界表示的具体实现，即拓朴与几何的联系。对具有几何信息的拓朴结构顶点（vertex）、边（edge）、面（face）进行了详细说明。本文只对顶点数据进行说明。
关键字Key Words：OpenCascade、BRep、Topology、Geometry
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摘要：Abstract. 本文通过给出曲面上曲线PCurve的定义来对OpenCascade中的Curve On Surface进行理解，并介绍了OpenCascade对应的类BRep_CurveOnSurface实现。通过Tcl脚本输出的球的拓朴信息，分析PCurve的实际应用。
Key words. OpenCascade, ACIS, PCurve, Curve on Surface, Parametric Surface
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摘要：Abstract. This paper is concerned with parametric curves and surfaces definitions, such as singular point and regular point and their application in OpenCascade. The two most common methods of representing curves and surfaces in geometric modeling are implicit equations and parametric functions. Successful geometric modeling is done using both techniques. When you use parametric functions to represent curves and surfaces, you need to pay attention for the characteristic of it, such as singularit
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摘要：摘要Abstract：通过对OpenCascade中的BRep数据的读写，理解边界表示法的概念及实现。理解了拓朴形状的数据结构，就对ModelingData模块有了清晰认识，方便OpenCascade其他模块如ModelingAlgorithms和Visiualization模块的理解。
关键字Key Words：OpenCascade, BRep, Topology, BRep Format
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摘要：摘要Abstract：现在的显示器大多数是光栅显示器，即可以看做一个像素的矩阵。在光栅显示器上显示的任何图形，实际上都是一些具有一种或多种颜色的集合。数学上精确表示的图形在显示器中只能用逼近的方式显示出来。本文主要对OpenCascade的BRep文件中用来显示曲线和曲面的离散数据结构进行说明。
关键字：OpenCascade, BRep, Polygon, Triangulation, Subdivision Curves,
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摘要：摘要Abstract：本文对OpenCascade中的几何曲面数据进行简要说明，并结合OpenSceneGraph将这些曲面显示。
关键字Key Words：OpenCascade、OpenSceneGraph、Geometry Surface、NURBS
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