摘要: 编译QCAD
eryar@163.com
目前开源的二维CAD有QCAD、LibreCAD等，且LibreCAD可以说是QCAD的分支版本。对比这款开源软件，发现QCAD的功能与操作习惯和AutoCAD更接近。LibreCAD是纯C++开发，而QCAD使用了Qt的Script模块，使用了C++和Javascript脚本两种开发方式。我觉得使用脚本来扩展功能比纯C++开发效率会高点，因为这些开源... 阅读全文
摘要: String类的设计一点都不容易，先不论C++，那怕是其他语言，在面对string的时候，一不小心也会掉坑，好比java，好比C#，一开始假设utf16是定长编码，后来Unicode发展到两个字节就装不下一个码位，字符串在java下，就有点尴尬了。就算是昧着良心用utf32编码，码元与码位终于一一对应了，也会遇到物理字符与逻辑字符不对应的时候，好像有些语言的字符要用两个unicode值来表示（很奇... 阅读全文
摘要: 近两年来在写C++的运行时环境，反射、运行时类型信息、内存管理、并行、字符串、协程、ORM等等，基本上重写了一套标准库以及运行库。对于在c++下使用字符串，深有体会。一开始呕心沥血，殚精竭虑，支持多种编码方式（Utf8、Utf7、GB2312、Utf16LE，Utf16BE等）的字符串类型，以及在此之上的对这些字符串提供格式化、字符串解析、json、xml、文件读写BOM等等功能，必须承认，大C+... 阅读全文
摘要: 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,... 阅读全文
摘要: 貌似现在流行知乎live和微信公众号， 博客已经有些过时了，但关键是你对技术的思考和总结， 采用什么方式其实不重要。
(1) 界面和逻辑的分离， view和controller可以由不同的人分别实现， 独立变动
(2) 基于接口分层设计， 单向依赖且低耦合
(3) UI层数据类型的分类，共有共享的还是私有的
(4) 消息中心，同时支持同步/异步的消息广播机制， Manager/Controller/Data Model可以各自订阅自己感兴趣的消息 阅读全文
摘要: Boolean operations between triangle meshes
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Abstract. Boolean operations is one of basic and well known on 3D models. The operations are widely used in computer graphics, game, CAD, EDA... 阅读全文
摘要: Massive Model Rendering Techniques
Andreas Dietrich Enrico Gobbetti Sung-Eui Yoon
Abstract
We present an overview of current real-time massive model visualization technology, with the goal of provi... 阅读全文
摘要: OpenCASCADE Texture Mapping
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Abstract. 纹理贴图技术的出现和流行是图形显示技术的一个非常重要的里程碑，直接影响3D技术从工业进入娱乐领域。本文结合OpenCASCADE中纹理贴图的源码，来说明纹理贴图在OpenCASCADE中实现。
Key Words. OpenCASCADE 纹理贴图, Texture Mapping
1.... 阅读全文
摘要: RvmTranslator6.1 - Attribute List
eryar@163.com
1. Introduction
RvmTranslator can translate the RVM file exported by AVEVA Plant(PDMS)/AVEVA Marine to STEP, IGES, STL, DXF, 3D PDF, OBJ, .etc. So it... 阅读全文
Virtual Reality: Immersive Yourself In Your 3D Mockup
ESI's Virtual Reality software solution IC.IDO is an exceedingly powerful immersive engineering solution combining high-end visualization and real-time simulation of product behavior in its actual size, and allows product operation very close to reality.
Major companies from the manufacturing industry (aerospace, ground transportation, industrial machinery) use IC.IDO VR software to perform collaborative and immersive design reviews, to evaluate and optimize assembly and disassembly sequences, to verify resources and tooling for both manufacture and maintenance, to support documentation and workflow animation/ training. IC.IDO detects contact and obstruction during assembly and maintenance procedures, and enables instant evaluation of flexible components such as pipes and cables.
Virtual Reality: Immersive Yourself In Your 3D Mockup | ESI Group
转载于：https://www.esi-group.com/software-solutions/virtual-reality-immersive-yourself-your-3d-mockup
摘要: OpenCascade Sweep Algorithm
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Abstract. Sweeps are the objects you obtain by sweeping a profile along a path. Sweep is a very useful modeling algorithm. The paper focus on the introducti... 阅读全文
摘要: OpenCASCADE Trihedron Law
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Abstract. In differential geometry the Frenet-Serret formulas describe the kinematic properties of a particle moving along a continuous, differentiable curve ... 阅读全文
摘要: OpenCascade Law Function
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1.Introduction
在OpenCASCADE的TKGeomAlgo Toolkit中提供了一个Law Package，在Law包中有一个基类：Law_Function，字面上翻译为 规则函数。其类图如下所示：
Figure 1. Law Function class diagram
本文主要对La... 阅读全文
摘要: RvmTranslator6.0 - Dassault Systemes 3DXML
eryar@163.com
1. Introduction
RvmTranslator can translate the RVM file exported by AVEVA Plant(PDMS)/AVEVA Marine to STEP, IGES, STL, DXF, 3D PDF, OBJ, 3D... 阅读全文
摘要: eryar@163.com
1. Introduction
RvmTranslator can translate the RVM file exported by AVEVA Plant(PDMS)/AVEVA Marine to STEP, IGES, STL, DXF, 3D PDF, OBJ, .etc. So it can used for exchanging model data... 阅读全文
摘要: RvmTranslator6.0
eryar@163.com
1. Introduction
RvmTranslator can translate the RVM file exported by AVEVA Plant(PDMS)/AVEVA Marine to STEP, IGES, STL, DXF, 3D PDF, OBJ, .etc. So it can used for exc... 阅读全文
摘要: 通过这篇文章我们主要回答以下几个问题： 1. LSH解决问题的背景，即以图片相似性搜索为例，如何解决在海量数据中进行相似性查找？ 2. 图像相似性查找的连带问题：相似性度量，特征提取； 3. LSH的数学分析，即局部敏感HASH函数的数学原理，通过与、或构造提升查找的查... 阅读全文