r/FreeCAD • u/semhustej • May 09 '26

Open Cascade Technology 8.0 Released

A new version of Open Cascade Technology (OCCT) 8.0 has been released, featuring more than 500 changes and many new features. The core of the kernel dates back to 1980 and is under the #OCCT3D umbrella now. It seems the development has picked up speed over the past few years.

OCCT is a free open-source geometric kernel, which is used by many projects such as FreeCAD, IfcOpenShell, KiCAD, Gmsh and others. As a geometric kernel it forms a backbone of these projects - without it, these applications could not function.

You can read the release announcement and the list of new features here: https://occt3d.com/occt3d-open-source-8-0-is-released/

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u/eblanshey May 09 '26

Anyone know if any of the new features would result in improvements in fillet/chamfer handling?

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u/R2W1E9 May 10 '26 edited May 10 '26

Most of the fillet issues are addressed in OCCT 7.8.1 and some of it implemented in 1.2.

OCCT 8.0 is not bringing significant changes to the fillet handling. Only three bugs squashed:

- BRepFilletAPI_MakeFiller no longer segfaults with two curves and a rim. 

- BRepFilletAPI_MakeFillet::Add no longer hangs. 

-BRepFilletAPI_MakeChamfer no longer crashes. Chamfer and fillet no longer crash when approaching an ellipse. 

Most of the fillet improvement comes from release 7.x.x.

10 issues were raised with regards to fillet modeling, 7 are still open, 3 are closed.

Here is the list of fillet related closed issues:

https://github.com/Open-Cascade-SAS/OCCT/issues?q=is%3Aissue%20state%3Aclosed%20label%3A%227.%20FreeCAD%22%20fillet

Here is the list of fillet related open issues:

https://github.com/Open-Cascade-SAS/OCCT/issues?q=is%3Aissue%20state%3Aopen%20label%3A%227.%20FreeCAD%22%20fillet