eryar

PipeCAD - Plant Piping Design Software.
PlantAssistant - Translate AVEVA RVM/SP3D VUE to glTF, STEP, etc.

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Split Shape by Plane in OpenCASCADE

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. 閱讀全文

posted @ 2017-07-01 12:21 eryar 閱讀(4050) | 評論 (0) | 編輯收藏

GLUT Trackball Demo

摘要: Trackball, Quaternion, View Transform 閱讀全文

posted @ 2017-06-07 23:01 eryar 閱讀(2175) | 評論 (2) | 編輯收藏

三維電梯仿真軟件開發3D

摘要: 本系統的電梯模型模擬三層樓，當轎廂系統上升（下降），重量平衡系統下降（上升），頂部的曳引系統則類似一個輪軸，要不停的旋轉順時針（逆時針），當電梯到達指定樓層時，轎廂的門能開關。因此現階段的動畫要求是實現轎廂系統上下運動、重量平衡系統上下運動、曳引機的旋轉和轎廂門的開關動畫。閱讀全文

posted @ 2017-06-02 23:27 eryar 閱讀(2859) | 評論 (0) | 編輯收藏

dimradius by AutoLisp in AutoCAD

摘要: 最近在開發一個自動出圖程序，從PDMS模型中取數據后，經過處理生成AutoCAD的圖紙。其中涉及到一個問題就是如何盡量使程序與AutoCAD低耦合，盡量不使用第三方庫的情況下，實現數據的傳遞。
最開始想到是用ODA(Open Design Alliance)的DWGdirect庫來直接生成DWG文件，并且PDMS中就是使用這個庫來生成DWG文件的。DWGdirect的用法與AutoCAD .Net的接口名稱基本一致，用法也相同，但是這樣就引入了第三方庫。
還有一種方法就是使用AutoLisp腳本來生成圖紙。這樣的話，程序只需要生成一個AutoLisp腳本文件，文件中包含創建圖形的命令。AutoLisp腳本與PDMS的PML類似，都需要一個解析執行的環境，即PML依賴PDMS平臺才能運行，AutoLisp依賴AutoCAD平臺。如果使用AutoLisp，程序不依賴DWG相關的第三方庫，只需要生成一個文本文件。決定使用AutoLisp后，還有一個問題，就是如何在啟動AutoCAD能自動加載生成的AutoLisp文件去生成圖紙。閱讀全文

posted @ 2017-05-18 21:33 eryar 閱讀(2156) | 評論 (0) | 編輯收藏

AVEVA PDMS to 3ds Max - RvmTranslator6.0beta

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

posted @ 2017-05-07 21:47 eryar 閱讀(2875) | 評論 (0) | 編輯收藏

Bounding Volume Hierarchy BVH in OpenCASCADE

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.
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posted @ 2017-05-03 22:50 eryar 閱讀(6487) | 評論 (0) | 編輯收藏

SdnfViewer - 3D Viewer for SDNF File

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: eryar@163.com. 閱讀全文

posted @ 2017-04-24 20:48 eryar 閱讀(2022) | 評論 (0) | 編輯收藏

Use PSO to find minimum in OpenCASCADE

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 閱讀全文

posted @ 2017-04-18 22:51 eryar 閱讀(1336) | 評論 (0) | 編輯收藏

Intersection between 2d conic in OpenCASCADE

摘要: Abstract. OpenCASCADE provides the algorithm to implement of the intersection between two 2d conic curve. The conic is defined by its implicit quadaratic equation, so the intersection problem is become a polynomial roots finding problem. The paper focus on the two conic curve intersection algorithm implementation.

Key Words. 2d conic intersection, conic equation 閱讀全文

posted @ 2017-03-25 22:40 eryar 閱讀(2198) | 評論 (0) | 編輯收藏

Intersection between a 2d line and a conic in OpenCASCADE

摘要: Abstract. OpenCASCADE provides the algorithm to implementation of the analytical intersection between a 2d line and another conic curve. The conic is defined by its implicit quadaratic equation, so the intersection problem is become a polynomial roots finding problem. The paper focus on the 2d line intersection another conic algorithm implementation.

Key Words. 2d line intersection, conic 閱讀全文

posted @ 2017-03-23 23:23 eryar 閱讀(1381) | 評論 (0) | 編輯收藏

OpenCASCADE 3 Planes Intersection

摘要: Abstract. OpenCASCADE provides the algorithm to search the intersection point between 3 planes. If two of the planes are parallel or identical, will get no result.

Key Words. Plane Intersection 閱讀全文

posted @ 2017-03-19 21:52 eryar 閱讀(1599) | 評論 (0) | 編輯收藏

Two analytical 2d line intersection in OpenCASCADE

摘要: Abstract. OpenCASCADE geometric tools provide algorithms to calculate the intersection of two 2d curves, surfaces, or a 3d curve and a surface. Those are the basis of the Boolean Operation, so under the implementation can help to under the BO algorithms. The paper focus on the intersection of two 2d analytical line.

Key Words. OpenCASCADE, Line Intersection 閱讀全文

posted @ 2017-02-25 23:05 eryar 閱讀(1721) | 評論 (0) | 編輯收藏

Visual Studio Set Project Environment Variables

摘要: In Visual Studio you can specify changes to environment variables in the project settings. Open your project, go to Project -> Properties... Under Configuration Properties -> Debugging, edit the Environment value to set environment variables.
For example, if you want to add the directory “c:\foo\bin” to the path when debugging your application, set the Environment value to “PATH=%PATH%;c:\foo\bin”.
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posted @ 2017-02-21 21:39 eryar 閱讀(1376) | 評論 (0) | 編輯收藏

PcfTranslator - Translate AVEVA PDMS to PCF

摘要: Abstract. The Piping Component File(PCF) are text files containing component and routing information. The PCF format was originally developed as an easy way to drive Isogen, the syntax is simple which means it is straightforward to create from most piping design software. But AVEVA PDMS only can export IDF format, PcfTranslator can translate AVEVA PDMS piping model to PCF, you can use the PCF in IsoAlgo for piping isometrics drawing or IsoAlgo3d to visualize the 3d model. You can also import the 閱讀全文

posted @ 2017-02-16 22:41 eryar 閱讀(4508) | 評論 (0) | 編輯收藏

PDMS RVM TO 3DXML - RvmTranslator6.0

摘要: RvmTranslator6.0 - Translate PDMS RVM to Dassault Systemes 3DXML. 閱讀全文

posted @ 2017-01-26 10:58 eryar 閱讀(1952) | 評論 (0) | 編輯收藏

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