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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…
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…
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 Face Normals eryar@163.com Abstract. 要显示一个逼真的三维模型,其顶点坐标.顶点法向.纹理坐标这三个信息必不可少.本文主要介绍如何在OpenCASCADE的Draw中显示出曲面的法向量,通过使用相关命令,来方便地对曲面的法向进行检查. Key Words. Face, Surface, Normals 1. Introduction 曲面上点的法向量对于三维显示程序来说是一个重要的数据,他的正确与否直接影响曲面对光照的反应进而影响显示效…
2015/6/4 Open CASCADE Technology: IGES Support http://www.opencascade.org/doc/occt­6.7.0/overview/html/user_guides__iges.html 1/35 Table of Contents Introduction Reading IGES Procedure Domain covered Translatable entities Attributes Administrative da…
<Differential Geometry of Curves and Surfaces> by Manfredo P. do Carmo real line Rinterval I==============================================CH1 CurvesDEFINITION. A parametrized differentiable curve is a differentiable map a: I --> R3 of [an open in…
<Differential Geometry of Curves and Surfaces> by Manfredo P. do Carmo real line Rinterval I==============================================CH1 CurvesDEFINITION. A parametrized differentiable curve is a differentiable map a: I --> R3 of [an open in…
A Absolute Mode Transform Type-in绝对坐标方式变换输入 Absolute/Relative Snap Toggle Mode绝对/相对捕捉开关模式 ACIS Options ACIS选项 Activate活动:激活 Activate All Maps激活全部贴图 Activate Grid激活栅格.激活网格 Activate Grid Object激活网格对象:激活网格物体 Activate Home Grid激活主栅格:激活主网格 ActiveShade实时渲染…
Surface Normal Vector in OpenCascade eryar@163.com 摘要Abstract:表面上某一点的法向量(Normal Vector)指的是在该点处与表面垂直的方向.对于平面,其上各点的法向是一样的,统一为这个平面的法向.对于曲面,各点具有不同的法向量.几何对象的法向量定义了它在空间中的方向,法向量是在进行光照处理时的重要参数.所以在显示造型算法离散曲面后的网格时,设置正确的法向量对场景的光照.光线追踪效果有直接影响.本文结合OpenCascade中代码,…
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…