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/…

转自 http://www.cppblog.com/eryar/archive/2013/08/20/202678.html Topology and Geometry in OpenCascade-Vertex eryar@163.com 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…

OpenCASCADE Make Primitives-Box eryar@163.com 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…

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…

Topology and Geometry in OpenCascade-Topology eryar@163.com 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OpenCasca…

Topology and Geometry in OpenCascade-Vertex eryar@163.com 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 一.引言 Int…

Boolean operations between triangle meshes eryar@163.com Abstract. Boolean operations is one of basic and well known on 3D models. The operations are widely used in computer graphics, game, CAD, EDA. The blog introduce the function in some open sourc…

OCCT模块结构图 基础类: Foundation Classes module underlies all other OCCT classes; 模型数据: Modeling Data module supplies data structures to represent 2D and 3D geometric primitives and their compositions into CAD models; 模型算法: Modeling Algorithms module contai…

OpenCASCADE BRep Projection eryar@163.com 一网友发邮件问我下图所示的效果如何在OpenCASCADE中实现,我的想法是先构造出螺旋线,再将螺旋线投影到面上. 为了验证我的想法,结合原来螺旋线的造型算法,来测试下这种效果的实现.依然采用Tcl脚本在Draw Test Harness中试验.个人觉得高效使用OpenCASCADE的方法应该也是先用Tcl脚本来验证一些想法后,再根据使用到的命令找到OpenCASCADE中DRAW的命令实现,最后再可以根据DRA…

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…