OpenCASCADE 麻花钻头造型实例分析 eryar@163.com Abstract. OpenCASCADE provides a simple twist drill bit modeling example in Tcl script. The blog will give a details of some key points, when you understand the key points, you can modeling the shape like that. Ke

OpenCASCADE中散乱Edge生成Wire eryar@163.com Abstract. In OpenCASCADE a wire can be built from any number of edges in sequence. If edges are not in sequence, you must sort them in order. Key Words. Edge, Wire, Wire order 1. Introduction 在OpenCASCADE中生成WIRE

Make Helix Curve in OpenCASCADE eryar@163.com Abstract. OpenCASCADE does not provide helix curve directly, but you can build a helix curve by the pcurve of a surface(curve on surface). When you understand the pcurve of a surface, you can make a helix

OpenCascade Primitives BRep - Box 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 ca

OpenCascade Ruled Surface eryar@163.com Abstract. A ruled surface is formed by moving a line connecting points of equal relative arc length or equal relative parametric value on two parametric curves from a start point to a terminate point on the cur

FAILED_LOGIN_ATTEMPTS 用于指定连续登陆失败的最大次数 达到最大次数后,用户会被锁定,登陆时提示ORA-28000 UNLIMITED为不限制 精确无误差 是 实时 PASSWORD_LIFE_TIME 用于指定密码有效天数 最少为1,UNLIMITED为不限制 如果已经有用户被提示ORA-28002错误,需要重新修改一次密码,即使此资源已经设置为UNLIMITED 精确无误差 否,始终开启 PASSWORD_REUSE_TIME 用于指定密码可重用时间 UNLIMITED为

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

Convert BSpline Curve to Arc Spline in OpenCASCADE eryar@163.com Abstract. The paper based on OpenCASCADE algorithms to approximate the NURBS curve to arc spline. The method is most useful in numerical control to drive the cutter along straight line

OpenCASCADE Expression Interpreter by Flex & Bison eryar@163.com Abstract. OpenCASCADE provide data structure of any expression, relation or function used in mathematics. Flex and Bison are tools for building programs that handle structured input. Th

OpenCASCADE Data Exchange - 3D PDF eryar@163.com Abstract. Today most 3D engineering model data are save to 3D PDF files. Universal 3D(U3D) along side Product Representation Compact(PRC), U3D is the historical foundation used to embed 3D interactive

OpenCASCADE Interpolations and Approximations eryar@163.com Abstract. In modeling, it is often required to approximate or interpolate points to curves and surfaces. In interpolation, the process is complete when the curve or surface passes through al

OpenCASCADE Ring Type Spring Modeling eryar@163.com Abstract. The general method to directly create an edge is to give a 3D curve as the support(geometric domain) of the edge. The curve maybe defined as a 2D curve in the parametric space of a surface

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

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 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 Linear Extrusion Surface eryar@163.com 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

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 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 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