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     摘要: Abstract. 本文介绍了参数曲面的第一基本公式,并应用曲面的第一基本公式,结合OpenCASCADE中计算多重积分的类,对任意参数曲面的面积进行计算。

Key Words. Parametric Curve, Parametric Surface, Gauss Integration, Global Properties  阅读全文

posted @ 2017-12-09 20:55 eryar 阅读(496) | 评论 (0)编辑 收藏

posted @ 2017-12-03 12:15 eryar 阅读(508) | 评论 (0)编辑 收藏

     摘要: Abstract. OpenCASCADE package BRepMesh can compute the Delaunay’s triangulation with the algorithm of Watson. It can be used for 2d plane or on surface by meshing in UV parametric space. The blog focus on the usage of the triangulation tool to triangulate 2d points.

Key Words. BRepMesh, Delaunay Triangulation,   阅读全文

posted @ 2017-11-11 12:48 eryar 阅读(706) | 评论 (0)编辑 收藏

     摘要: Abstract. 管道设计CAD系统中都有涉及到重量重心计算的功能,这个功能得到的重心数据主要用于托盘式造船时方便根据重心设置吊装配件。重量信息主要用于采购订货。本文主要介绍相关软件中重量重心功能,及重量重心计算实现原理。最后结合OpenCASCADE计算管道模型重量重心来验证。

Key Words. CoG, CentreOfMass, Piping CAD, Piping Design  阅读全文

posted @ 2017-11-06 22:36 eryar 阅读(655) | 评论 (0)编辑 收藏

     摘要: Abstract. IsoAlgo3d 通过将PCF三维可视化,并导出HTML文件。由于使用WebGL技术,所以只要设备支持HTML5,就可以不用安装任何软件或插件直接浏览PCF对应的全尺寸标注的管道三维模型,不管是电脑、平板还是智能手机。三维直接浏览管道模型,更加直观,避免了二维ISO图有时表达不清晰的情况,如环管出图,复杂管线分图后识图困难等,方便现场施工。

Key Words. IsoAlgo3d, 管道ISO图,三维管道图,WebGL, 平板,手机  阅读全文

posted @ 2017-11-04 19:05 eryar 阅读(680) | 评论 (0)编辑 收藏

     摘要: Abstract. FreeType is required for text display in the 3D viewer. FreeType is a software font engine that is designed to be small, efficient, highly customizable, and portable while capable of producing high-quality output(glyph images). It can be used in graphics libraries, display servers, font conversion tools, text image generation tools, and many other products as well. The blog is focus on the FreeType usage in OpenCASCADE to convert text to BRep shape.

Key Words. FreeType, OpenCA  阅读全文

posted @ 2017-10-22 21:18 eryar 阅读(723) | 评论 (0)编辑 收藏

     摘要: 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.

Key Words. OpenCASCADE, Twist Drill Bit Modeling, Tcl  阅读全文

posted @ 2017-09-18 23:35 eryar 阅读(647) | 评论 (0)编辑 收藏

     摘要: OpenCASCADE各版本源码下载  阅读全文

posted @ 2017-09-08 09:08 eryar 阅读(1162) | 评论 (0)编辑 收藏

     摘要: StdTranslator - Translate PDMS to STD for STAAD.Pro  阅读全文

posted @ 2017-09-01 21:50 eryar 阅读(621) | 评论 (0)编辑 收藏

     摘要: 顶平台A型支架  阅读全文

posted @ 2017-08-23 21:55 eryar 阅读(509) | 评论 (0)编辑 收藏

     摘要: OcadePlatform 设备平台建模  阅读全文

posted @ 2017-08-22 22:19 eryar 阅读(518) | 评论 (0)编辑 收藏

posted @ 2017-08-13 10:07 eryar 阅读(663) | 评论 (0)编辑 收藏

     摘要: Abstract. Sometimes you want to split a shape by plane or even split a shape by a B Spline surface, OpenCASCADE provide a feature class BRepFeat_SplitShape to implement the function. The paper give a sample code to split a cylinder by plane.
Key Words. Split Shape, BRep Feature Algorithms.  阅读全文

posted @ 2017-07-01 12:21 eryar 阅读(929) | 评论 (0)编辑 收藏

     摘要: Trackball, Quaternion, View Transform  阅读全文

posted @ 2017-06-07 23:01 eryar 阅读(802) | 评论 (2)编辑 收藏

     摘要: 本系统的电梯模型模拟三层楼,当轿厢系统上升(下降),重量平衡系统下降(上升),顶部的曳引系统则类似一个轮轴,要不停的旋转顺时针(逆时针),当电梯到达指定楼层时,轿厢的门能开关。因此现阶段的动画要求是实现轿厢系统上下运动、重量平衡系统上下运动、曳引机的旋转和轿厢门的开关动画。  阅读全文

posted @ 2017-06-02 23:27 eryar 阅读(1209) | 评论 (0)编辑 收藏

     摘要: 最近在开发一个自动出图程序,从PDMS模型中取数据后,经过处理生成AutoCAD的图纸。其中涉及到一个问题就是如何尽量使程序与AutoCAD低耦合,尽量不使用第三方库的情况下,实现数据的传递。
最开始想到是用ODA(Open Design Alliance)的DWGdirect库来直接生成DWG文件,并且PDMS中就是使用这个库来生成DWG文件的。DWGdirect的用法与AutoCAD .Net的接口名称基本一致,用法也相同,但是这样就引入了第三方库。
还有一种方法就是使用AutoLisp脚本来生成图纸。这样的话,程序只需要生成一个AutoLisp脚本文件,文件中包含创建图形的命令。AutoLisp脚本与PDMS的PML类似,都需要一个解析执行的环境,即PML依赖PDMS平台才能运行,AutoLisp依赖AutoCAD平台。如果使用AutoLisp,程序不依赖DWG相关的第三方库,只需要生成一个文本文件。决定使用AutoLisp后,还有一个问题,就是如何在启动AutoCAD能自动加载生成的AutoLisp文件去生成图纸。  阅读全文

posted @ 2017-05-18 21:33 eryar 阅读(867) | 评论 (0)编辑 收藏

     摘要: RvmTranslator6.0beta: Translate PDMS RVM to 3ds Max by MAXScript file.  阅读全文

posted @ 2017-05-07 21:47 eryar 阅读(1083) | 评论 (0)编辑 收藏

     摘要: Abstract. Bounding Volume Hierarchy(BVH) organizes geometric objects in the tree based on spatial relationships. Each node in the tree contains an axis-aligned bounding box of all the objects below it. Bounding volume hierarchies are used in many algorithms to support efficient operations on the sets of geometric objects, such as collision detection, ray-tracing, searching of nearest objects, and view frustum culling. The paper focus on the usage of BVH on TopoDS_Shape, and its application.

posted @ 2017-05-03 22:50 eryar 阅读(1401) | 评论 (0)编辑 收藏

     摘要: SdnfViewer - 3D Viewer for SDNF File.

Use SdnfViewer to view the structure model by SDNF file. The SdnfViewer is under developing, if you have any questions, suggestions, you can send me email, my email address is:  阅读全文

posted @ 2017-04-24 20:48 eryar 阅读(837) | 评论 (0)编辑 收藏

     摘要: Abstract. Starting from OCCT6.8.0 will include one more algorithm for solving global optimization problems. Its development has been triggered by insufficient performance and robustness of existing algorithm of minimization of curve-surface distance in Extrema package. The PSO, Algorithms in this family are stochastic, and this feature can be perceived as opposite to robustness. However, we found it was not only much faster than original deterministic one, but also more robust in complex real-wo  阅读全文

posted @ 2017-04-18 22:51 eryar 阅读(640) | 评论 (0)编辑 收藏

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