News

Technical Issues from Nov, 8th, 7:30 CET to 10:00 CET

We recently experienced a temporary issue with our database management system (DBMS). The issue has been resolved, and we do not believe any data has been lost. However, as a precaution, we recommend the following actions:

• If …

Server Update

We a currently doing some larger updates in order to finally start the verification. You may encounter some smaller issues during this time. If the webpage is not displayed correctly, your browser may still have some outdated css or js files cached. A hard reload should fix …

The challenge instance for CG:SHOP 2025 are now online!

We are also providing a PyUtils package to verify your solutions, as well as a naive solver you can use to get started. We will need some days to set up the evaluation system, due to the more complex scoring …

First Announcement: CG Challenge 2025

We are happy to announce the Seventh Computational Geometry Challenge, as part of CG Week in Kanazawa, Japan, June 23-27, 2025.

As in previous years, the objective will be to compute good solutions to instances of a difficult geometric optimization problem. The specific problem chosen for the 2025 Challenge is Minimum Non-Obtuse Triangulations, as follows.

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CG:SHOP Challenge 2025: Call for Problems

Since 2019, the CG:SHOP Challenge has been part of CG Week. The objective is to compute good solutions for instances of a challenging geometric optimization problem. The contributors with the most outstanding solutions are recognized at CG Week and invited to present their …

With only a few days left, participants are reminded of the approaching submission deadline. If you face any issues during submission, please email us with your team's name and a hash of your solution files. Once you have the files ready, follow up with a link for us to access them.

If you experience any issues with your account, possibly due to our ongoing maintenance to manage disruptive activities on the site, please email us. We will resolve it promptly.

I am pleased to announce that the instances for our competitions are now available for download. Furthermore, we have successfully implemented the solution upload functionality. However, please note that the verification process for submitted solutions will commence in a few weeks' time.

Presenting our latest example instances! Your feedback was invaluable, and we've responded accordingly. The example file has been revamped—say goodbye to pesky tiny objects in instances. Plus, a new generator has been included! And that's not all – we've also introduced visualizations for the new instances.

First batch of example instances for the new CGSHOP2024 challenge! You can find it on the corresponding page under the download button. Please note that this is just the first batch and we are still experimenting with generators. We may publish a further batch of example instances once we have …