Thu, 05/14/2026 - 16:37
Dear OCCT community,
We would like to inform you about upcoming changes to the Open CASCADE Technology collaborative development portal at dev.opencascade.org.
In the coming weeks, the website and its public forum will be switched to read-only mode. After this change, it will no longer be possible to create new forum topics, post replies, or update existing forum content.
For new questions, discussions, and community support, please use the OCCT GitHub Discussions page:
https://github.com/Open-Cascade-SAS/OCCT/discussions
Active web site: https://occt3d.com/.
Existing Forum Content
Existing public forum threads will be preserved and remain available as a public knowledge base. As part of the migration process, forum content will be anonymized to remove personal data from the public archive where possible. The website is planned to be converted into a static archive hosted on GitHub or a similar platform.
Personal Data and Legal Considerations
As part of this transition, we are reviewing the personal data currently processed by the website and related services. The goal is to minimize the storage and processing of personal data and to keep only the information that is necessary for legitimate operational, technical, or legal purposes. Personal data associated with public website features, including forum accounts and forum authorship information, will be removed or anonymized as part of the migration, where technically and legally possible. Certain records may need to be retained where there is a valid legal or contractual reason to do so. In particular, Contributor License Agreement (CLA) records may be preserved, as they are related to contribution rights and legal traceability for the OCCT project. The resulting public archive is intended to contain technical and community knowledge without exposing unnecessary personal data.
Documentation and Other Resources
Documentation and other technical resources currently available on the website will be migrated to alternative storage and will remain accessible.
The dev.opencascade.org domain will be kept. Redirects will be configured where appropriate to preserve access to existing content, bookmarks, and external links, and to minimize issues with search indexing.
These changes are intended to simplify the website infrastructure, reduce personal data processing, and keep OCCT-related public resources available to the community.
Thank you for your understanding and for your continued participation in the OCCT community.
We continue to operate as usual and provide information as a part of OCCT3D https://occt3d.com/.
Best regards,
Open CASCADE Team
Tue, 05/19/2026 - 08:48
Hi OCCT Team,
the sudden closing of dev.opencascade.org's public resources that used to be the well-known way of communication for the community all these years and moving to another well-known resources, on the one hand, looks natural, on the other, is a bit unexpected when you see Mantis not functioning as a bugtracker anymore.
In the old days the release of the new version took place once a year, so, maybe, not all of the users/customers have noticed the change yet and it might be a surprise when they notice that some of their issues are now lost (archived).
There is a good tradition when some old works of art are transferred to the public domain and made available for the users after some period of time agreed with the authors or publishers. To say, from the point of view of the historical interest, it is now impossible to find any OCCT version earlier than 6.4, though it is mentioned that it had been open source long before.
So, looking at the dozens of the test cases supplied along with OCCT that are marked as SKIPPED because of the missed data raises a question: maybe OCCT have something similar in their workflow and are going to release some new portion of the test data to the public as well?
Do you have any procedure or agreement like this?
It would be harder now when Mantis is shut down, but when it was active, users could have reviewed their issues easily for that matter if you had contacted them, because after 2 or 5 years most of the data becomes irrelevant. Maybe if you contacted them directly, they would be more informed about the changes and also agreed to participate.
It feels like it is actually a common interest both for the OCCT and the community (both public and private) to have as much test data available as possible - in this way, more stable and reliable patches could be provided before making the pull requests. Good thing is, with the AI it is now possible to remove or replace the sensitive parts in there.
Best regards.
Tue, 05/19/2026 - 11:47
Hello.
The private data is not available to the public. We do not have more public dataset to the publishing. All skipped tests contains proprietary models from clients.
The legal processes of opening data and discussion with the original reporters will is comlex processes and at the moment we are not ready to proceed with them. At the moment we have ±15 PR from community per year and most part of them are not functional. As a result it is not high priority for us. In case if we will have growing of the PR, we will proceed with more actions.
At the moment any PR is tested on our side before approve the issue.
Best regards, Dmitrii.
Wed, 05/27/2026 - 12:04
The prototype forum version: OCCT Forum Archive
All public attachments preserved.
Best regards, Dmitrii.