Stewart Cheifet, creator of The Computer Chronicles, dead at 87 https://obits.goldsteinsfuneral.com/stewart-cheifet (https://news.ycombinator.com/item?id=46446359)

Why C++ programmers keep growing fast despite competition, safety, and AI https://herbsutter.com/2025/12/30/software-taketh-away-faster-than-hardware-giveth-why-c-programmers-keep-growing-fast-despite-competition-safety-and-ai/ (https://news.ycombinator.com/item?id=46442015)

What is this new trend of writing posts on social media formatted in tiny paragraphs ? Are generative AI systems degenerating ? will they then produce content token by token ? Then character by c h a r a c t e r ? 1011 01010 0 0 00000000 Aahhh, finally, the end of all this non-sense !!!

Geogram 1.9.8 is out ! github.com/BrunoLevy/ge... Geogram is a programming library with geometric algorithm. it has mesh repair, mesh simplification, mesh intersection, Delaunay triangulation, exact predicates and much more !

Found under the christmass tree, very nice lego set for a computer graphic programmer 😉. Customized it a bit with a powerful LED.

1 To predict the behaviour of a primate, would you rather base your guess on a closely related species or one with a similar brain shape? We looked at brains & behaviours of 70 species, you’ll be surprised! 🧵Thread on our new preprint with @r3rt0.bsky.social , doi.org/10.1101/2025...

Pure Silicon Demo Coding: No CPU, No Memory, Just 4k Gates https://www.a1k0n.net/2025/12/19/tiny-tapeout-demo.html (https://news.ycombinator.com/item?id=46337438)

[Leaving X] .... DONE Goodby to my 10000 followers, so long X, and thanks for the fish ! My stream of computational physics news / hardware engineering / geek stuff will continue here: - www.linkedin.com/in/blevy/ - fosstodon.org/@BrunoLevy01 - bsky.app/profile/brun...

Giving a presentation of our work on Lagrangian topological optimization with Charles Dapogny and Edouard Oudet at the Inria-LJLL seminar: project.inria.fr/rencontreslj... preprint here: arxiv.org/abs/2409.07873

This chip is special, (tinytapeout.com/chips/ttsky2...) - it has designs made by hobbyists - it has two #FemtoRV designs in it !! FemtoRV is a super simple RiscV processor that we designed with Matthias Koch because we were boring during COVID...): github.com/BrunoLevy/le...

There is also Phong Tessellation in this family, which is meant to have nicer continuity properties: perso.telecom-paristech.fr/boubek/paper...

AI, AI, AI everywhere, but I prefer... ... a more elegant weapon of a civilized age !

You are doing geometry processing, you need precision, performance, and easy compilation on Linux/Mac/Windows ? My fork of the mini-gmp lib is available here: github.com/BrunoLevy/mi... Use it wisely ! (with great power comes great responsibilities...) Image credit: Ed Sheeran

Alea Jacta Est

Et en plus il se paye ma tronche (avec l'accent du midi)...

github.com/BrunoLevy/le... has just reached 3000 stars on github. What is it ? a hand-on tutorial to learn processor design with FPGAs. In a couple of evenings, you will create a full-fledged Risc-V. Why would I want to do that ? Why not !!

Ooops, once again I spilled some aperiodic coffee

#geogram 1.9.7 is out ! Geogram is a software library of geometric algorithms, it has mesh intersection, remeshing, CSG, Delaunay and Voronoi in 2D and 3D, constrained Delaunay triangulation in 2D ... and much more ! github.com/BrunoLevy/ge...

New publication out! doi.org/10.1093/bioi... VTX is open source and freely accessible for non commercial use! github.com/VTX-Molecula... Builds available at vtx.drugdesign.fr

Graphite's interactive "CosmoViewer". Explore your cosmologic simulations interactively !

Large-scale semi-discrete optimal transport with distributed Voronoi diagrams, Final version available here: www.sciencedirect.com/science/arti...

Fast Minkowski sum, making progress....

Is #geogram's Constrained Delaunay Triangulation robust ? ... on the testbench ! github.com/BrunoLevy/ge...

Teaching processor design at Telecom Nancy Lesson 1: build your own risc-V processor at home using a FPGA Course notes are here: github.com/BrunoLevy/le...

RING meeting in Nancy, Cyprien Plateau--Holleville presented presented his awesome work on exact integration of the differential quantities involved in Partial Optimal Transport. And that's not all: It comes with a combined physsim - Optimal Transport - rendering on the GPU !

Our article "Large-scale semi-discrete optimal transport with distributed Voronoi diagrams" (with Nicolas Ray, Quentin Merigot and Hugo Leclerc) just got accepted by Journal of Computational Physics. Pushing the limits of Optimal Transport by several orders of magnitude !

Minkowski sum starts to fly in #geogram (WIP...)

Mesh intersection algorithm (dl.acm.org/doi/10.1145/...) just got faster ! ... Nice, but ... ... does it really work ? Let's put it on the testbench.

Playing with CSG engine, stress test, example_024 from OpenSCAD testsuite, but level 5 (instead of level 3 by default). Constrained Delaunay Triangulation goes brrr.

#geogram + #graphite + #blender Python scripting = robust CSG directly available in Blender ! Everything is a numpy array.

New project, all warnings activated, warning as error. Let's call it a day !

Working on mesh intersection ? You want to test your algorithm ? ThingiCSG is a database of 200 models in the OpenSCAD file format, together with some code to help you parse them. github.com/BrunoLevy/th... See also my recent TOG article on the topic dl.acm.org/doi/10.1145/...

An interesting take on half-edges on the wiki of Geogram library by @brunolevy01.bsky.social github.com/BrunoLevy/ge... Basically, saving, loading, copying, adding attributes, parallelization, and rendering are easier with incidence arrays. Creation and deletion of elements gets harder.

G is for Geometry, G is for Geogram ! New version v1.9.6 of Geogram, the award winning geometry processing library. Press G for Geogram, and play with advanced geometry processing tools. github.com/BrunoLevy/ge...

Mesh intersections is hard ! Three years of agonizing pain summarized in my article that just got accepted to ACM Transactions on Graphics dl.acm.org/doi/10.1145/... The implementation and the expansion-based arithmetic kernel are available in geogram: github.com/BrunoLevy/ge...

#geogram v1.9.5 is out (github.com/BrunoLevy/ge...) - improved OpenSCAD compatibility - some modern C++ "syntaxic sugar" for easier iteration on mesh elements - fixed several graphic glitches on MacOS

New "EasterEgg" release of #geogram (1.9.5), the geometry processing library github.com/BrunoLevy/ge... This image: Python-polyscope-geogram interop, more on this here: github.com/BrunoLevy/py... Egg from: thingiverse.com/thing:5860339

Let's try to do smthg by hand Generating this starter pack used considerable resources - at least 10 ml of ink - a sheet of paper - 5 min of my time (one can guess it is not more, but at least it looks like no other one)

Today's bug is cute !

In light of the recent Studio Ghibli generative models, may I recommend folks read this paper: dl.acm.org/doi/10.1145/...

The Symposium on Geometry Processing is an amazing venue for geometry research: meshes, point clouds, neural fields, 3D ML, etc. Reviews are quick and high-quality. The deadline is in ~10 days. Consider submitting your work, I'm planning to submit! sgp2025.my.canva.site/submit-page-...

We have been reworking the Quickstart guide of POT to show multiple examples of OT with the unified API that facilitates access to OT value/plan/potentials. It allows to select regularization/unbalancedness/lowrank/Gaussian OT with just a few parameters. pythonot.github.io/master/auto_...

Fluiidsim of the day: High res 2D bubbles, with Cyprien Plateau's accurate computation of the free surface.

FluidSim of the day.

Fun with Gallouet-Merigot scheme: Semi-discrete fluid sim with cubes.

Didn't quite make it to SIGGRAPH? Consider submitting to SGP, the abstract deadline is tomorrow: sgp2025.my.canva.site/submit-page-...

#geogram, the geometry processing library, just reached 2K stars on github github.com/BrunoLevy/ge... It t has remeshing, reconstruction, mesh intersection, CSG, Delaunay in 2D and 3D, constrained Delaunay in 2D, Voronoi and power diagrams, semi-discrete optimal transport...