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Collaborative development portal Toggle navigation Sign in Get involvedResources DownloadIssue trackerGit repositoryComponentsOnline-documentationTraining & E-learningTechnical supportFAQLicensingBlogForum All ForumsActive TopicsAboutResearch & ScienceProjects & ProductsContact us Join the global community of OCCT developersOpen CASCADE Technology (OCCT) is the only open-source full-scale 3D geometry library. Striving to be one of the best free cad software kernels, OCCT is widely used for the development of specialized programs dealing with the following engineering and mechanical domains: 3D modeling (CAD), manufacturing (CAM), numerical simulation (CAE), measurement equipment (CMM) and quality control (CAQ). Since its publication in 1999 as an open source CAD software kernel, OCCT has been successfully used in numerous projects ranging from building and construction to aerospace and automotive. ArchitectureOpen CASCADE Technology consists of C++ classes grouped into Packages. They are organized into Toolkits (libraries), and the latest are grouped into seven Modules. You can download Open CASCADE library totally free and use it at any PC with Windows, macOS or Linux. Please refer to our Download page for easy OCCT access. If you are interested in OCCT open-source code, go to the Git Repository for simple git access without registration.Foundation ClassesModeling dataModeling AlgorithmsData ExchangeVisualizationApplication Framework (OCAF)Draw Test Harness Features Geometric modeling OCCT algorithms allow to:Calculate the intersection of two 2D curves,surfaces, or a 3D curve and a surfaceProject points onto 2D and 3D curves,points onto surfaces, and 3D curvesonto surfacesConstruct lines and circles fromconstraintsConstruct curves and surfacefrom constraintsConstruct curves and surfacesby interpolation andapproximation Surface and solid modeling OCCT comes with algorithms for:Construction of primitives (box, sphere, cylinder, cone, torus, wedge)Computation and comparison of distances between shapesConstruction of prisms and pipesSurface extrusion/revolutionDefining offset surfaces/curvesDefining fillets and chamfersBoolean operations (input, common, cut, fuse.) Data Exchange Data Exchange module allows developing OCCT-based applications that interact with other CAD systems by writing and reading 3D models to and from external data in open and vendor-neutral formats.This tool handles various problems of interoperability between CAD systems, caused by differences in model validity criteria and requirements to internal representation.Supported formats:B-Rep: STEP (ISO 10303), IGES, BREP (native)Mesh: glTF, VRML (ISO 14772), OBJ Wavefront, STL Visualization OCCT visualization toolset provides:Cross-platform renderer based on OpenGL and OpenGL ESCompatibility with mobile, embedded (OpenGL ES)and web (WebGL) platformsBuilt-in photo-realistic Ray-Tracing enginesupporting global illuminationClipping planes/box with cappingPBR metallic-roughnessmaterial workflowFast algorithms pickingobjects by mouse Should you have more particular queries (for example, how to read dwg files in OCCT or what is the easiest free cad drawing software to use for your specific purposes etc.), one of the ways you can get support is reading blog or posting on OCCT forum, where all the questions are very welcome. Active forum topics WebGL Build Problem : error: duplicate symbol: PLUGINFACTORYTest '-fwasm-exception' crashStandards Compliance - OCC STEP - "AP 242 Edition 2" fully (or more) [FreeCAD] ?AXIS2_PLACEMENT_3D transfer from STEPStandards Compliance - OCC STEP - "AP 242 Edition 2" fully (or more) ?More New forum topics WebGL Build Problem : error: duplicate symbol: PLUGINFACTORYStandards Compliance - OCC STEP - "AP 242 Edition 2" fully (or more) [FreeCAD] ?AXIS2_PLACEMENT_3D transfer from STEPStandards Compliance - OCC STEP - "AP 242 Edition 2" fully (or more) ?Test '-fwasm-exception' crashMore Use casesOpen CASCADE Technology is also a backbone of many good projects. For example, FreeCAD providing parametric 3D modelling, drafting and many other capabilities is easy to use for beginners. KiCad – free 3D CAD software for PCB layouts design. Gmsh – a fast meshing tool. Salome – a platform for numerical simulation. CAD Assistant – a powerful viewer and converter.Visit OCCT Projects & Products Marketplace to learn more. OCCT in Research & ScienceOpen CASCADE Technology (OCCT) is actively used at an academic and research levels around the globe. OCCT Research and Science website section presents more than 600 articles and research projects conducted by 400+ organizations in 48 countries. Browse by subject, author, or country to get a wider look at OCCT capabilities and application opportunities. Explore the collection of research publications via the link. Need assistance with OCCT?Paid Technical SupportIf you seek a 3d cad support about any technical questions connected with OCCTRead moreE-learning and On-site TrainingsExplore OCCT possibilities and take their companies’ projects onto new heightsRead more © 2011-2022 OPEN CASCADE SASTerms of Use Privacy PolicyCookie Policy Cookie settings Contact us