Open Cascade Technology: Difference between revisions

Revision as of 19:17, 21 November 2021

Revision as of 16:13, 22 November 2021

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===Open sourcing===

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=https://web.archive.org/web/20120409094949/httpshttp://findarticles.com/p/articles/mi_pwwi/is_20050229/ai_mark01000244 Downloading Of Source Code For Open Cascade Gains Momentum]/|access-date=2021-11-22|website=web.archive.org}}</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]].

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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 additional 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/index.php?q=nodecontent/908 OCCT license change]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|last=Callaway |first=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>

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

* '''Visualization''': 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 as interactive [[Ray tracing (graphics)|Ray-Tracing]]/[[Path tracing|Path-Tracing]] engine.

* '''Data Exchange''': provides possibility to import/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/content/productcustomers-and-partners/datakit/|access-date=2021-11-22|website=opencascade.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 as other supplementary information like [[Product and manufacturing information|PMI]].

* '''Application Framework''': offers solutions for handling application-specific data.

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