The 41st International Symposium on Computational Geometry (SoCG 2025) is planned to be held in Kanazawa, Japan, June 23–27, 2025, as part of the Computational Geometry (CG) Week. We invite high quality submissions that describe original research on computational problems in a geometric and/or topological setting. Topics of interest include, but are not limited to:

- Design, analysis, and implementation of geometric algorithms and data structures;
- Computational complexity of geometric problems;
- Implementation and experimental evaluation of geometric algorithms and heuristics, including mathematical, numerical, and algebraic aspects;
- Discrete and combinatorial geometry;
- Computational topology, topological data analysis, and topological combinatorics;
- Applications of computational geometry or topology in any field.


IMPORTANT DATES

- November 26, 2024 (Tuesday): Abstracts and paper registration due (23:59 AoE (anywhere on Earth))
- December 3, 2024 (Tuesday): Papers due (23:59 AoE (anywhere on Earth))
- February 6, 2025 (Thursday): Notification of acceptance/rejection
- mid March 2025: Final versions of accepted papers due
- June 23–27, 2025: Symposium


SoCG 2025 conference web page: https://socg25.github.io/

SoCG 2025 HotCRP submission webpage: https://socg25.hotcrp.com/


CODE OF CONDUCT
SoCG is dedicated to providing an environment that is free from harassment, bullying, discrimination, and retaliation for all participants. Starting in 2025, CG Week including SoCG will be organized as an event of the CG Society (https://computational-geometry.org/society/). All members of the Society are bound by its Code of Conduct. Only members of the Society can give a presentation and hence at least one author of each accepted paper must become a member of the Society. Society membership is free.


SUBMISSION GUIDELINES

+ Paper types
When writing or evaluating a SoCG paper, it is important to keep in mind that there are different types of contributions, each with its own strengths. To ensure that a submission is evaluated on its own merits, authors will need to identify the main strengths of their submission, as captured by four possible paper types. PC members and external reviewers will be asked to take into account these paper types together with their associated evaluation criteria when they evaluate a paper. There are no quotas for the paper types and submissions can be labeled with more than one paper type at the time of submission.

- Mathematical Foundations: A typical paper will contain theorems and proofs describing new results in discrete or combinatorial geometry, discrete differential geometry or topology, or in topological combinatorics. The paper will primarily be evaluated on its technical depth, the importance of the results, the elegance of the solution, the connection of the problem studied to computational geometry and topology, and the potential future impact on algorithm development.

- Algorithmic Complexity: A typical paper will contain algorithms, data structures, theorems, proofs, or lower bound constructions describing new results on computational geometry problems. The paper will primarily be evaluated on the (mathematical or computational) relevance and importance of the problem studied, its technical depth, the elegance of the solution, and the potential future impact of the results or the proposed new methods and techniques.

- Experiments and Implementation: A typical paper will make a clear contribution to the implementation and evaluation of geometric algorithms, such as exact, approximate, or algebraic computation, algorithms engineering, or the experimental evaluation of competing algorithmic approaches. The paper will primarily be evaluated on the completeness and the expected impact of the proposed implementation, the soundness of the experiments, the quality and quantity of testing, and on the general amount of knowledge gained.

- Applications: A typical paper will describe the modeling and algorithmic choices made when developing or adapting computational geometry techniques for an application area. The paper will be primarily evaluated on the soundness of the modeling decisions, the ingenuity of the solution, the effectiveness of the proposed method, and the expected impact in the application area. One might also consider the lesson learned regarding the applicability or suitability of computational geometry tools to the specific area.

+ Double Blind and PC submissions
SoCG will employ a lightweight double-blind reviewing process, and will allow PC members (other than the PC chairs) to submit to the conference as well. Submissions should not reveal the identity of the authors in any way. In particular, authors' names, affiliations, funding information, and email addresses should not appear in the submission. Authors should ensure that any references to their own related work is in the third person (e.g., not "We build on our previous work ..." but rather "We build on the work of ..."). Particular care needs to be taken if there is any accompanying software or data, which needs to be linked anonymously (for example, via a DropBox anonymous folder or Anonymous GitHub, perhaps with a subset of synthetic data if the real data is not anonymized). Upon registering a submission, the authors will declare conflicts of interest with PC members, as well as listing email address or domain level conflicts (i.e. “Haitao Wang (University of Utah)”, “All (Graz University of Technology)”) of other professional or personal conflicts. This includes past advisors and students, people with the same affiliation, and any recent/frequent coauthors and collaborators. Please refer to the SoCG 2025 Conflict of Interest Guidelines (https://docs.google.com/document/d/1QNR3JUe_DimGP79EbcmayUi7I3obiTdxAIzXMFxaCfI/pub) for a detailed discussion of possible conflicts of interest.

The purpose of lightweight double-blind reviewing is to help PC members and external reviewers come to an initial judgment about the paper without bias, not to make it impossible for them to discover the authors if they were to try. Authors should feel free to disseminate their ideas or draft versions of their paper as they normally would. For example, authors may post drafts of their papers on the web, submit them to arXiv, and give talks on their research ideas. We encourage authors with further questions on double-blind reviewing to contact the PC chairs, or to see the more detailed discussion in the proposal that preceded the vote to move to double blind.

+ Format
Submissions must be formatted in accordance with the LIPIcs proceedings guidelines (https://www.dagstuhl.de/en/publishing/series/details/lipics). Authors are required to use the LaTeX class file socg-lipics-v2021.cls (V0.9, Sep 19, 2022), with the option “anonymous”; note that the class file is a wrapper around the standard LIPIcs class. The LIPIcs style and instructions are available here (https://submission.dagstuhl.de/series/details/5#author); the SoCG class file is available here (https://computational-geometry.org/documents/socg-lipics-v2021.cls), and instructions on how to use it are available here (https://computational-geometry.org/documents/linecount_2022_09_19.pdf). Submissions must not exceed 500 lines, excluding front matter (title), references, and a clearly marked appendix (further described below), but including all other lines (in abstract, algorithms, tables, captions, etc.). The class files provide line counting which should be accurate in most cases. Authors should refrain from putting excessive amounts of text in parts in which lines are not counted automatically. If authors need constructs that contain uncounted lines of text, they should compensate for this by reducing the final line count accordingly. It is the sole responsibility of the authors not to exceed 500 lines even if some lines are not counted automatically.

+ Contents of the submission
Papers should be submitted in the form of an extended abstract, which begins with the title of the paper, as well as a short abstract. This should be followed by the main body of the paper that begins with a precise statement of the problem considered, a succinct summary of the results obtained (emphasizing the significance, novelty, and potential impact of the research), and a clear comparison with related work. The remainder of the extended abstract should provide sufficient details to allow the program committee to evaluate the validity, quality, and relevance of the contribution. Clarity of presentation is very important; the entire extended abstract should be written carefully, taking into consideration that it will be read and evaluated by both experts and non-experts, often under tight time constraints.

In addition, authors are asked to avoid "et al." in citations in favor of an equal mention of all authors' surnames. For instance, if the number of authors is large, consider writing "The authors in [#] show" instead of "A et al. [#] show".

+ Appendix and additional data
All details needed to verify the results must be provided. Supporting materials, including proofs of theoretical claims and experimental details, that do not fit in the 500-line limit should be given in an appendix. If more appropriate, the full version may be given as the appendix. In both cases, however, the authors should include in the main part specific pointers to the relevant locations in the appendix. The appendix will be read by the program committee members and subreviewers at their discretion and will not be published as part of the proceedings. Thus, the paper without the appendix should be able to stand on its own. Experimental and implementation results (independent of paper type) must be reproducible and verifiable. Authors of all types of papers are encouraged to put accompanying software and relevant data, if there is any, in a repository accessible to the reviewers.

+ Previous or simultaneous submission
Results previously published or accepted for publication in the proceedings of another conference cannot be submitted. Simultaneous submissions of the results to another conference with published proceedings are not allowed. Exempted are workshops and conferences without formal proceedings, but possibly with handouts containing short abstracts. In particular, submissions of papers that have appeared or will be submitted to EuroCG are allowed, since EuroCG does not publish formal proceedings, while submissions of papers that have appeared in CCCG are not allowed. Results that have already been accepted (with or without revision) for publication in a journal at the time of their submission to the symposium are not allowed.

+ Strict guidelines
Submissions deviating from the above guidelines risk being rejected without further consideration.

+ Guidelines for reviewers
The guidelines for reviewers are available here (https://computational-geometry.org/documents/socg-reviewing.pdf).


ACCEPTED PAPERS

+ Presentation: An author of each accepted paper is expected to attend the symposium and present the paper (approximately 20 minutes). Note that SoCG 2025 will be organized as an event of the CG Society (https://computational-geometry.org/society/) and hence the presenting author(s) must be a member of the Society. Society membership is free.

+ Best paper award: An accepted paper may be selected as the best paper. All papers are eligible.

+ Best student paper award: An accepted paper may be selected as the best student paper. A paper is eligible if all authors are students at the time of submission. This must be indicated in the submission process. There is a box provided for this purpose on the submission server.

+ Best student presentation award: Based on the feedback from the audience, a presentation during the symposium by a student may be selected as the best student presentation.

In exceptional cases, each of these awards may be granted to more than one paper/presentation.

+ Invited papers and special issues: Authors of the best paper will be invited to submit an extended version of their paper to the Journal of the ACM, and authors of one (or more) most highly ranked papers may be invited to submit their full paper to the journal TheoretiCS. Authors of a selection of accepted papers from the symposium will be invited to submit extended versions of their papers to special issues of Discrete & Computational Geometry and Journal of Computational Geometry.

+ Format: Final proceedings versions of accepted papers must respect the same formatting constraints as the submissions (LIPIcs proceedings format with socg-lipics-v2021; 500-line limit, excluding front matter and references), but must not comprise any appendix. If any supporting material (including complete proofs of theoretical claims and experimental details) does not fit in the specified limit, then the full version of the paper containing this information must be referenced in the conference version and made available at a public repository, such as arXiv, by the time the final version is submitted. Where applicable, we encourage the authors to make accompanying software and/or data publicly accessible, with proper references in the paper.


PROGRAM COMMITTEE

- Mikkel Abrahamsen, University of Copenhagen
- Oswin Aichholzer, Graz University of Technology (co-chair)
- Hugo Akitaya, University of Massachusetts Lowell
- Mark de Berg, Eindhoven University of Technology
- Sujoy Bhore, Indian Institute of Technology Bombay
- Ahmad Biniaz, University of Windsor
- Håvard Bakke Bjerkevik, SUNY Albany
- Gerth Stølting Brodal, Aarhus University
- Hsien-Chih Chang, Dartmouth College
- Siu-Wing Cheng, Hong Kong University of Science and Technology
- Vida Dujmović, University of Ottawa
- David Eppstein, University of California, Irvine
- Emily Fox, University of Texas at Dallas
- Jie Gao, Rutgers University
- Dan Halperin, Tel Aviv University
- Tao Hou, University of Oregon
- Christian Knauer, University of Bayreuth
- Francis Lazarus, Université Grenoble Alpes
- Chih-Hung Liu, National Taiwan University
- Daniel Lokshtanov, University of California Santa Barbara
- Anna Lubiw, University of Waterloo
- Amir Nayyeri, Oregon State University
- Eunjin Oh, Pohang University of Science and Technology
- Tim Ophelders, Utrecht University and TU Eindhoven
- Irene Parada, UPC BarcelonaTech
- Rahul Saladi, Indian Institute of Science
- Patrick Schnider, University of Basel and ETH Zürich
- Raimund Seidel, Saarland University
- Don Sheehy, North Carolina State University
- Shakhar Smorodinsky, Ben-Gurion University
- Jonathan Spreer, University of Sydney
- Takeshi Tokuyama, Kwansei Gakuin University
- Torsten Ueckerdt, Karlsruhe Institute of Technology
- Pavel Valtr, Charles University
- Kasturi Varadarajan, University of Iowa
- Haitao Wang, University of Utah (co-chair)
- Jinhui Xu, University at Buffalo
- Jie Xue, New York University Shanghai