opencascade code study

计算曲线拐点-卡核

计算曲线拐点

1 Introduction 曲线上有一些特殊点会影响曲线的连续性,如重点(Multiple Point)、尖点(Cusp Point)、拐点(Inflection Point)等。一般称曲线上凸弧和凹弧的分界点称为拐点。 图1 曲线极值...
Sweep折角过渡处理-卡核

Sweep折角过渡处理

1 Introduction在《The NURBS Book》中对扫掠曲面Swept surfaces有如下定义:S(u,v)=T(v) + M(v) C(u)其中轨道曲线记为T(v),截面曲线记为C(u),M(v)是一个变换矩阵。从扫掠曲面定义中可以看出...
曲面构造-蒙皮曲面-卡核

曲面构造-蒙皮曲面

蒙面Skinning就是将一簇截面曲线融合在一起生成曲面的过程,截面曲线可以是三维曲线。截面曲线的参数方向为u方向,融合的方向是v方向。蒙面Skinned Surface只是放样(lofting)的新叫法,后者可以...
精确HLR之边数据-卡核

精确HLR之边数据

Abstract. 精确HLR算法是根据模型生成图纸的重要算法,使用精确HLR算法,对于球体、圆柱体、圆锥体可以生成直线和圆弧,为生成的图纸再加工提供一些便利。OpenCASCADE中精确HLR算法较Poly算法要...
Geometry Surface of OpenCascade BRep-卡核

Geometry Surface of OpenCascade BRep

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...
OpenCASCADE BRep vs. OpenNURBS BRep-卡核

OpenCASCADE BRep vs. OpenNURBS BRep

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 OpenCA...
Representation Data in OpenCascade BRep-卡核

Representation Data in OpenCascade BRep

Representation Data in OpenCascade BRep eryar@163.com 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...
OpenCASCADE Color Scale-卡核

OpenCASCADE Color Scale

OpenCASCADE Color Scale eryar@163.com Abstract. The color scale is a specialized label object that displays a color map and an accompanying numerical scale for color mapped or cont...
OpenCASCADE License FAQs-卡核

OpenCASCADE License FAQs

OpenCASCADE License FAQs   经常用人问我使用OpenCASCADE开发商业软件是否需要付费,下面从OpenCASCADE的官方网站上截取其回答翻译成中文,官方网址:https://www.opencascade.com/conten...
OpenCASCADE Root-Finding Algorithm-卡核

OpenCASCADE Root-Finding Algorithm

OpenCASCADE Root-Finding Algorithm eryar@163.com Abstract. A root-finding algorithm is a numerical method, or algorithm, for finding a value x such that f(x)=0, for a given functio...
OpenCASCADE Make Primitives-Sphere-卡核

OpenCASCADE Make Primitives-Sphere

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...
OpenCASCADE 曲线向曲面投影-卡核

OpenCASCADE 曲线向曲面投影

OpenCASCADE 曲线向曲面投影 eryar@163.com   Abstract: Project a curve on a surface no matter the surface is a plane or BSpline Surface. The projected result curve are all BSpli...