Open CASCADE Technology 7.3.0 is available for download!


May 29, 2018

OPEN CASCADE is pleased to announce a new public release of Open CASCADE Technology (version 7.3.0).

Open CASCADE Technology version 7.3.0 is a minor release, which includes more than 350 new features, improvements and bug fixes over minor release 7.2.0.

New in this version:


  • Support of Unicode file names and software signals handling for MinGW-w64 builds
  • Recommendations on fulfillment of LGPL terms in Overview documentation
  • Restored compatibility with Visual Studio 2008
  • Support of GBK and Big5 code pages

Application Framework

  • Ability to redefine the stored/retrieved document version and the application name


  • Face Removal algorithm
  • Optimized surface intersection, shape offset and Boolean operation algorithms
  • Oriented Bounding Boxes (OBB)
  • More complete history in the family of Boolean Operations algorithms
  • Improved stability of BRepProj_Projection algorithm


  • Corrected translation of single-stroke fonts into BRep
  • Improved compatibility with EGL on Linux, Intel HD GPUs, Mesa OpenGL, remote desktop
  • Possibility to arrange more than 8 light sources and assign them to layers
  • Possibility to assign Shading Model per primitive array
  • Support of custom GLSL programs with Geometry and Tessellation shaders
  • Distance and size culling options for rendering large scenes
  • Depth pre-pass option for rendering heavy custom GLSL programs
  • Verbose frame statistics for profiling 3D Viewer performance

Data exchange

  • Documentation for PMI in XCAF

Detailed information about this release is available in Release Notes (PDF).

To download Open CASCADE Technology, please, visit our Download Center.

Please, contact us for any additional information.

Sushrut Pavanaskar's picture

Hello, I am unable to download these (getting a 404). Is something amiss?

Kirill Gavrilov's picture

The problem should be fixed now - please try again.

Sushrut Pavanaskar's picture

thanks, it works now

Hugues Delorme's picture


In the download center the VS2017 x64 binaries are provided but the installer exe is called opencascade-7.3.0-vc14-64.exe

But "vc14" refers to VS2015 if I'm right. The internal version number for VS2017 is vc15.x.

So what is the VS version used for the prebuilt opencascade 7.3.0 binaries ? VS2015 or VS2017 ?

Kirill Gavrilov's picture

Compiler toolset coming with VS2017 is identified as vc141 not vc15, which means that it produces binaries compatible with vc14 coming with VS2015.
Pre-built binaries are fine for testing and learning OCCT, but for production it is always better building it yourself
(so that you will be able also answering questions like which VS update within particular version of Visual Studio has been used, and which one has broken everything previously working fine).

antony.marion.pukcab_141771's picture


Using the node-occ wrapper for Open Cascade I noticed that with the same complex geometries I have everything working properly with occt 7.1.0.

Using version  occt 7.3.0. I get a 'Process finished with exit code -1073741819 (0xC0000005)' on node (all version) Windows and the correspond segmentation fault with core dump (I can provide you the dumped cores for more details).

Nothing else changed, So I suppose something is broken from 7.1.0 to 7.3.0 ?

Any information would be nice.


Kirill Gavrilov's picture

To report an issue, you should provide more information than "with the same complex geometries" which nobodies here aware of.
Please prepare a test scenario (steps to reproduce) with shared geometry data (if needed).
Issues should be reported on bugtracker to pay attention to real developers of OCCT:
Dump core is not very helpful without reproducing scenario, and especially if OCCT wasn't built with Debug information.

In case of doubt that this is actually an OCCT issue, or if you have no idea how to reproduce issue without node-occ wrapper - consider reporting the issues to node-occ wrapper developers.

antony marion's picture

Ok thanks; I have created an issue there and forwarded an OCCT 7.2.0 branch of the Node JS wrapper repository.

I can't share the 3d model.

If the dump with OCCT built in Debug Mode does not provide useful information I will provide a free 3D Model and give the steps to reproduce the scenario that crashes the node JS wrapper.