Open Cascade Technology: Difference between revisions

Revision as of 19:44, 6 January 2025

Revision as of 13:07, 8 January 2025

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| author =

| developer = [[Open Cascade]] S.A.S.U.

| released = {{Start date and age|1999|df=yes|1999}}

| latest release version = {{wikidata|property|edit|reference|Q1760165|P548=Q2804309|P348}}

| latest release date = {{start date and age|{{wikidata|qualifier|Q1760165|P548=Q2804309|P348|P577}}}}

| latest preview version =

| latest preview date =

| status =

| programming language = [[C++]]

| operating system = [[Linux]], [[FreeBSD]], [[Mac OS XmacOS]], [[Microsoft Windows|Windows]], [[Android (operating system)|Android]], [[iOS]] and, [[WebAssembly]]

| platform = [[IA-32]], [[x86-64]], [[ARM architecture family|ARM]]

| platform =

| genre = [[Computer-aided design|CAD]], [[Computer-aided manufacturing|CAM]], [[Computer-aided engineering|CAE]]

| license = [[GNU Lesser General Public License|LGPL- 2.1- only]]<ref>{{cite web |url=https://git.dev.opencascade.org/gitweb/?p=occt.git;a=blob;f=README.txt |title=README.txt}}</ref> with exception<ref name="licensing" />

| website = https://{{URL|dev.opencascade.org}}

}}

'''Open Cascade Technology''' ('''OCCT'''), formerly callednamed '''CAS.CADE''', is an [[open-source software]]a development platform for [[3D computer graphics|3D]] [[Computercomputer-aided design|CAD]] (CAD), [[Computercomputer-aided manufacturing|CAM]] (CAM), [[Computercomputer-aided engineering|CAE]] (CAE), etc. thatIt is developed and supported by [[Open Cascade|Open Cascade]] SAS company. It is [[free and open-source software]] companyreleased under the [[GNU Lesser General Public License]] (LGPL), version 2.1 only, which permits open source and proprietary uses.

OCCT is a full-scale [[Boundaryboundary representation|]] (B-Rep (Boundary representationrep)]] modeling toolkit. OCCT is available under the [[GNU Lesser General Public License|LGPL-2.1-only]] license, which permits its usage in open source and proprietary applications.

==History==

''CAS.CADE'' (abbreviated from Computer Aided Software for Computer Aided Design and Engineering) was originally developed in the early 1990s by [[Matra]] Datavision, developer of [[Euclid (computer program)|Euclid]] CAD software as the underlying infrastructure for its future version Euclid Quantum. In 1998 the company abandoned software development to concentrate on services, and most of the software development facilities were sold<ref>{{cite web|url=https://www.3ds.com/press-releases/single/dassault-systemes-signs-agreement-to-acquire-matra-datavisions-subsidiary/|title=Dassault Systemes Signs Agreement to Acquire Matra Datavision's Subsidiary|date=27 January 2020 }}</ref> to [[Dassault Systèmes]], developer of competing [[CATIA]].

{| class="wikitable"

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!Product name

!Release date

!Latest Updateupdate Versionversion

!Latest Updateupdate Datedate

!Highlights

|-

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|{{nowrap|2022-04-29}}

|

* Added progress indication / abortionindication–abortion to Boolean operations and offset algorithm.

* Added support of kinematics entities to STEP reader.

* Introduced interface for partial OCAF document reading.

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|2021-08-06

|

* Real-time [[Physicallyphysically based rendering]] (PBR) renderer using Metallicmetallic-Roughnessroughness material model.

* WebAssembly target platform support (including [[WebGL]] viewer).

* UNICODE support in STEP reader/writerreader–writer.

|-

!Open CASCADE Technology 7.4

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* Added support of 3/4 and box clipping configurations to 3D viewer.

* Added fast HLR-alike [[OpenGL]] rendering mode.

* Removed legacy Locallocal Contextcontext functionality from AIS and legacy Boolean operations.

|-

!Open CASCADE Technology 7.3

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|

* Introduced "Fuzzy"<ref>{{Cite web|title=Fuzzy Boolean Operations - Forum Open Cascade Technology|url=https://dev.opencascade.org/content/fuzzy-boolean-operations|access-date=2021-08-18|website=dev.opencascade.org}}</ref> Boolean operations with specified global tolerance.

* Introduced built-in multi-threading parallelization tools as alternative to [[Threading Building Blocks|TBB]] (TBB) [[Library (computing)|library]].

* Improved robustness of surface-surface intersection and curve on surface projection.

* Improved performance of p-curve reconstruction within STEP import.

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* Added STL-compatible iterators to NCollection classes.

* "Handle" smart-pointer now uses NULL pointer instead of a special value 0xfefd0000.

* Added [[Boundingbounding volume hierarchy]] (BVH) algorithms and structures.

* Introduced multi-threaded version of Boolean operation algorithm.

* Introduced limited [[OpenGL ES]] 2.0 support in 3D viewer.

* Added VIS / TKIVtkVIS–TKIVtk component<ref>{{Cite web|title=VTK integration services in OCCT - Forum Open Cascade Technology|url=https://dev.opencascade.org/content/vtk-integration-services-occt|access-date=2021-08-18|website=dev.opencascade.org}}</ref> providing a B-Rep shape presentation builder for [[VTK]] viewer.

* Added support of [[Stereo display|stereoscopic displays]]<ref>{{Cite web|title=Stereoscopic rendering in Open CASCADE Technology - Forum Open Cascade Technology|url=https://dev.opencascade.org/content/stereoscopic-rendering-open-cascade-technology|access-date=2021-08-18|website=dev.opencascade.org}}</ref> within 3D viewer.

* Added frustum culling feature improving rendering performance.

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|2014-04-30

|

* '''License has been changed to [[GNU Lesser General Public License|LGPL-2.1-only]] with additionaladded exception.'''<ref name="licensing" />

* Built-in GPU-accelerated Ray-Tracing rendering engine<ref>{{Cite web|title=Ray tracing as alternative rendering method for OCCT visualization component - Forum Open Cascade Technology|url=https://dev.opencascade.org/content/ray-tracing-alternative-rendering-method-occt-visualization-component|access-date=2021-08-18|website=dev.opencascade.org}}</ref> using [[OpenCL]].

|-

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In 1999 Matra Datavision decided to publish its CAS.CADE infrastructure under an open-source model under the ''Open CASCADE Technology Public License''<ref>{{cite web|url=http://www.opencascade.org/getocc/license/license_old/|title=Open CASCADE Technology Public License}}</ref> and renamed it Open Cascade.<ref>{{Cite web|date=2012-04-09|title=Downloading Of Source Code For Open Cascade Gains Momentum &#124; Market Wire &#124; Find Articles|url=http://findarticles.com/p/articles/mi_pwwi/is_20050229/ai_mark01000244/|access-date=2021-11-22|archive-url=https://web.archive.org/web/20120409094949/http://findarticles.com/p/articles/mi_pwwi/is_20050229/ai_mark01000244/|archive-date=9 April 2012}}</ref>

In 2000, a separate company, Open Cascade SAS, was created to make business around Open Cascade.<ref>[http://www.ebusiness-watch.org/studies/case_studies/documents/Case%20Studies%202005/CS_SR10_IT-services_4-Open_Cascade.pdf European e-Business Market Watch Case Study: Open source-based services by Open Cascade S.A.] {{webarchive|url=https://web.archive.org/web/20110726012648/http://www.ebusiness-watch.org/studies/case_studies/documents/Case%20Studies%202005/CS_SR10_IT-services_4-Open_Cascade.pdf |date=26 July 2011 }}</ref> Open Cascade SAS was sold in 2003 to Principia, a French service provider corporation, and then in 2006 it was acquired by [[Euriware]] Group, a subsidiary of [[Areva]].

In 2004, software was renamed to Open Cascade Technology in order to distinguish it from the name of the company itself.

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===Community fork===

In March 2011, Thomas Paviot initiated a fork of the then most recent publicly available version 6.5.0 of Open Cascade library. The initiative is callednamed Open Cascade Community Edition. The project aims to establish a separate community-based release and bug-report process for the library.<ref>{{cite web|url=http://www.opencascade.org/org/forum/thread_20111/|title=Thinkings about the 6.5.0 release, OCCT status, and the relationship with the Community|access-date=15 April 2011|archive-date=16 April 2011|archive-url=https://web.archive.org/web/20110416225420/http://www.opencascade.org/org/forum/thread_20111|url-status=dead}}</ref>

===Collaborative development portal===

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=== License change ===

Since 18 December 2013, with version 6.7.0, Open Cascade Technology is available under the [[GNU Lesser General Public License|LGPL-2.1-only]] with additionaladded exception.<ref name="licensing">{{cite web|url=https://dev.opencascade.org/resources/licensing/|title=OCCT license}}</ref><ref>{{Cite web|title=Relicensing OCCT - Forum Open Cascade Technology|url=https://dev.opencascade.org/content/relicensing-occt|access-date=2021-11-22|website=dev.opencascade.org}}</ref> Versions before that were licensed under the "Open Cascade Technology Public License" which was [[License compatibility|not compatible]] with the [[GPL]]<ref>{{cite web|title=OCCT FAQ|url=https://dev.opencascade.org/resources/faq/|work=dev.opencascade.org|publisher=Open Cascade|access-date=25 June 2021}}</ref> and was considered non-free by the [[Fedora Project|Fedora project]].<ref>{{cite web |lastlast1=Callaway |firstfirst1=Tom |title=Licensing:Main – Bad Licenses |url=https://fedoraproject.org/wiki/Licensing:Main?rd=Licensing |work=fedoraproject.org |publisher=Red Hat, Inc. and others |access-date=18 May 2013}}</ref>

== FunctionalityFunctions ==

===Object libraries===

OCCT's functionality is split into several large modules. Each module defines a list of toolkits ([[Library (computing)|libraries]]). Key Modulesmodules:

* '''Foundation Classes''': – defines basic classes, memory allocators, OS abstraction layer, collections (data maps, arrays, etc.), acceleration data structures ([[Bounding volume hierarchy|BVH Treestrees]]) and [[Linear algebra|vector/matrix math]] used by other Modules.

* '''Modeling Data''': – supplies data structures to represent 2D and 3D geometric primitives (analytical curves: Line, [[Circlecircle]], [[Ellipseellipse]], Hyperbolahyperbola, [[Parabolaparabola]], [[Bézier curve|Bézier]], [[B-spline]], Offsetoffset; analytical surfaces: Planeplane, [[Cylindercylinder]], [[Conecone]], [[Spheresphere]], [[Torustorus]], [[Bézier surface|Bézier]], [[B-spline]], [[Surface of revolution|Revolutionrevolution]], Extrusionextrusion, Offsetoffset) and their compositions into [[Boundaryboundary representation|B-Rep]] (B-rep) models.

* '''Modeling Algorithms''': – contains a vast range of geometrical and topological algorithms (intersection, Boolean operations, [[Surface triangulation|surface meshing]], [[Fillet (mechanics)|fillets]], shape healing).

* '''Visualization (rendering)''': – provides interactive services for displaying geometry in 3D Viewer; implements a compact [[OpenGL]] / –[[OpenGL ES]] renderer, supporting conventional [[Phong shading|Phong]], real-time [[Physically based rendering|PBR]] metal-roughness shading models as well asand interactive [[Ray tracing (graphics)|Ray-Tracingray tracing]]/ – [[Pathpath tracing|Path-Tracing]] engine.

* '''Data Exchange''': – provides possibility to import/exportimport–export various CAD formats. <br/>[[ISO 10303|STEP]], [[IGES]], [[glTF]], [[Wavefront .obj file|OBJ]], [[STL (file format)|STL]], and [[VRML]] are supported natively.<ref>{{Cite web|title=Data Exchange &#124; Open CASCADE Technology|url=https://dev.opencascade.org/about/data_exchange|access-date=2021-11-22|website=dev.opencascade.org}}</ref> Other formats can be imported by using plug-ins.<ref>{{Cite web |title=Datakit - Open Cascade|url=https://www.opencascade.com/customers-and-partners/datakit/ |access-date=2021-11-22 |website=opencascadeOpen Cascade.com |language=en}}</ref> ''Extended Data Exchange'' ('''XDE''') components rely on a unified '''XCAF document''' definition, which includes an assembly structure of CAD shapes, color/name/material/metadata/layer attributes as well asand other supplementary information like [[Productproduct and manufacturing information|PMI]] (PMI).

* '''Application Framework''': – offers solutions{{buzzword inline|date=January 2022}}means forto handlinghandle application-specific data.

* '''DRAW Test Harness''': – implements a scripting interface to OCCT algorithms based on [[Tcl]]-interpreter for interactive usageuse, automating processes, prototyping applications and testing purposes.

===Workshop Organization Kit===

Workshop Organization Kit (WOK) is Open Cascade development environment, which has been designed to allow a large number ofmany developers to work on a product, gettingexploiting advantage ofone common reference version shared over thea [[local area network]] (LAN).

Until OCCT 7.0.0 release, substantial modifications in the source code were not possible without using WOK, since it is the only tool that provides support for CDL (CAS.CADE definition language), used for declaration of most of OCCT classes and also serving to define logical structure of OCCT libraries. WOK has been included in previous OCCT distributions; since OCCT version 6.4 it is made an independent tool.

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===Working with IFC files===

The Open CASCADE IFC Import SDK provides applications with the capability of reading [[Buildingbuilding Informationinformation Modeling|BIMmodeling]] (BIM) data from files in [[Industry Foundation Classes|IFC]] (IFC) format.

It supports versions IFC2×3 and IFC4 that used by most modern applications.<ref>{{cite web|url=https://www.opencascade.com/components/ifc-import-component/|title=Open CASCADE: IFC Import Component|access-date=2022-11-15}}</ref>

This allows visualizationvisualizing and manipulation ofmanipulating building geometries and CAD designs.

External tools are available to convert from Open CASCADE to IFC as wellalso.<ref>{{cite web|url=https://cadexchanger.com/brep-to-ifc/|title=CAD Exchanger: How to convert Open CASCADE to IFC?|access-date=2022-11-15}}</ref>

== CAD programs based on Open Cascade Technology ==

Several CAD programs rely on Open CASCADE Technology including:<ref>Open Cascade SAS.[https://dev.opencascade.org/about/projects_and_products "Projects and products"].</ref>

Open Cascade SAS.

[https://dev.opencascade.org/about/projects_and_products "Projects and products"].

</ref>

* [[FreeCAD]] an open source, 3D parametric modeler, with support for [[building information modeling]], [[Finitefinite element method|finite-element-method]] (FEM)]], and [[pythonPython (programming language)|Python]] scripting.<ref name=fossmint>{{cite webnews |last1=Okoi url|first1=Martins |date=December 1, 2017 |url=https://www.fossmint.com/freecad-3d-modeling-and-design-software-for-linux/ |title=FreeCAD first– =A Martins3D |Modeling lastand =Design OkoiSoftware |for dateLinux |work= December 1, 2017FOSSMint | access-date = May 2, 2019 | publisher = FOSSMint | title = FreeCAD – A 3D Modeling and Design Software for Linux}}</ref><ref>{{cite webnews |last1=Lee url|first1=Hawk |date=2018-06-22 |url=https://engineeringdeskstudies.com/?p=365 | first = Hawk | last = Lee | title = FreeCAD FEM Workbench (Calculix 2.14) | date = 2018-06-22 | access-date = 2019-05-02 | archive-url = https://web.archive.org/web/20190503003156/https://engineeringdeskstudies.com/?p=365 | archive-date = 3 May 2019 | url-status = dead }}</ref>

* [[Salome (software)|SALOME]] an open source platform for pre- and post-processing for numerical simulation.

* [[KiCad]] an open source suite for electronic design automation (EDA).<ref>KiCad [https://dev-docs.kicad.org/en/build/getting-started/ "Library Dependencies"].</ref>

KiCad

[https://dev-docs.kicad.org/en/build/getting-started/ "Library Dependencies"].

</ref>

* [[Gmsh]] an open source finite-element mesh (FEM) generator. Since version 3.0, Gmsh supports full constructive solid geometry features, based on OCCT.

* [[FORAN System|FORAN]] an integrated CAD/CAM/CAE system developed by [[SENER]] for the design and production of practically any naval ship and offshore unit. [[FORAN System|FORAN]] uses OCCT since V80R2.0 release<ref>{{cite web |date=2016-07-19 |title=SENER's latest version of FORAN V80R2.0 lets users manage series of ships |url=https://www.marine.sener/press-releases/seners-latest-version-of-foran-v80r20-lets-users-manage-series-of-ships |url-status=dead |archive-url=https://web.archive.org/web/20180821060920/https://www.marine.sener/press-releases/seners-latest-version-of-foran-v80r20-lets-users-manage-series-of-ships |archive-date=2018-08-21 |access-date=4 August 2020}}</ref> for working with analytical surfaces.

== See also ==

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* [[Computer-aided design]]

* [[Open Design Alliance]]

* [[Building Informationinformation Modelingmodeling]]

* [[Industry Foundation Classes]]

==References==

{{Reflist|2}}

{{CAD software}}