在OpenSceneGraph中绘制OpenCascade的曲面 Render OpenCascade Geometry Surfaces in OpenSceneGraph eryar@163.com 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 一.引言 Introduction <

OpenCASCADE 平面与球面求交 eryar@163.com OpenCASCADE提供了类IntAna_QuadQuadGeo用来计算两个二次曲面quadric(球面.圆柱面.圆锥面及平面,平面是二次曲面的特例)之间的交线.他们之间可能的结果有: l 一个点 l 一条或两条直线 l 一个点和一条直线 l 圆 l 椭圆 l 抛物线 l 双曲线 将源码结合<高等数学>.<解析几何>等书,可以来学习如何将理论付诸实践.本文主要介绍这个类中平面与球面求交的源码实现.  将源码列出如

OpenCASCADE PCurve of Topological Face eryar@163.com Abstract. OpenCASCADE provides a class BRepBuilderAPI_MakeFace to build topological faces. A face maybe built from a surface, elementary surface from gp package, surface from Geom, from a wire and

Geometry Surface of OpenCascade BRep eryar@163.com 摘要Abstract:几何曲面是参数表示的曲面 ,在边界表示中其数据存在于BRep_TFace中,BRep_TFace中不仅包括了几何曲线,还包含用于显示的离散几何信息,如三角剖分数据.本文主要对OpenCascade的BRep表示中几何曲面进行说明,将在后面分析Topology部分的读写程序时来说明包含几何数据的三种拓朴结构中分别包括哪些几何信息. 关键字Key Words:OpenCasca

OpenCASCADE General Transformation eryar@163.com Abstract. OpenCASCADE provides a general transformation class: gp_GTrsf. It can be a transformation from gp, an affinity, or you can define your own transformation giving the matrix of transformation.

OpenCASCADE Hidden Line Removal eryar@163.com Abstract. To provide the precision required in industrial design, drawings need to offer the possibility of removing lines, which are hidden in a given projection. OpenCASCADE provides two algorithms for

OpenCASCADE View Manipulator eryar@163.com Abstract. When you finish modeling objects in the scene, you must want to use some operations to view the scene objects, such as Pan, Zoom and Rotate the scene. Pan and Zoom is easy to understand, rotate the

OpenCASCADE Coordinate Transforms eryar@163.com Abstract. The purpose of the OpenGL graphics processing pipeline is to convert 3D descriptions of objects into a 2D image that can be displayed. In many ways, this process is similar to using a camera t

OpenCASCADE Camera eryar@163.com Abstract. OpenCASCADE introduce a new class Graphic3d_Camera for the Visualization module. The camera class provides object-oriented approach to setting up projection and orientation properties of 3D view. The paper u

OpenCASCADE Make Primitives-Sphere eryar@163.com 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 cod

OpenCASCADE BRep vs. OpenNURBS BRep eryar@163.com 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/

OpenNURBS to OpenCASCADE eryar@163.com 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 fai

OpenCASCADE Conic to BSpline Curves-Circle eryar@163.com 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

OpenCASCADE Rational Bezier Curves eryar@163.com 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, hyperbo

Mesh Algorithm in OpenCascade eryar@163.com Abstract. Rendering a generic surface is a two steps process: first, computing the points that will form the mesh of the surface and then, send this mesh to 3D API. Use the Triangle to triangulate the param

OpenCascade Primitives BRep - Sphere eryar@163.com 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

Package gp in the OpenCASCADE eryar@163.com China 一.简介 Introduction to Package gp gp是几何处理程序包(Geometric Processor package),简称gp.包gp提供以下功能: 代数计算:如坐标计算.矩阵计算: 基本解析几何元素:如变换.点.矢量.线.面.轴.二次曲线和初等曲面: 这些实体同时在二维和三维空间中定义,且包中的类都是非持续的(non-persistent),即这些类的实例都是以值的方式

Topology Shapes of OpenCascade BRep eryar@163.com 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 一

在OpenSceneGraph中绘制OpenCascade的曲线 Render OpenCascade Geometry Curves in OpenSceneGraph eryar@163.com 摘要Abstract:本文简要说明OpenCascade中几何曲线的数据,并将这些几何曲线在OpenSceneGraph中绘制出来. 关键字KeyWords:OpenCascade.Geometry Curve.OpenSceneGraph.B-Spline.NURBS 一.引言 Introduct

Geometry Curve of OpenCascade BRep eryar@163.com 摘要Abstract:几何曲线是参数表示的曲线 ,在边界表示中其数据存在于BRep_TEdge中,BRep_TEdge中不仅包括了几何曲线,还包含其他类型的几何信息.本文主要对OpenCascade的BRep表示中几何曲线进行说明,将在后面分析Topology部分的读写程序时来说明这三种拓朴结构中分别包括哪些几何信息. 关键字Key Words:OpenCascade BRep, Geometry