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Bruno Levy

@brunolevy01.bsky.social
1.2K followers 500 following 319 posts

Researcher in computational physics,, Scientific director of Program Inria Quadrant 2018-2022 director of Inria Nancy G-Est, ERC GOODSHAPE-VORPALINE, #riscv ambassador

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Reposted by Bruno Levy
Soulcié @soulcie.fr · 29/09/2026
Dessin de juin 2024 pour @telerama.bsky.social
Bardella paternel sur un rocking chair dit à un mini juif et un mini musulman qu'il les déteste tous les deux autant mais differemment
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Florence Dellerie @florencedellerie.bsky.social · 16/09/2026
🎨 Ils ne sont pas "ternes" ! Ils sont uniques, bien camouflés, fascinants à observer et à dessiner. Les "papillons de nuit" sont des sujets que j'adore illustrer. RDV bientôt avec les Éditions Delachaux & Niestlé pour en découvrir davantage 👀 #SciArt #lépidoptères #entomologie
Planche d'illustrations, signée Florence Dellerie, montrant sept papillons d'espèces différentes et une chenille. On y voit : Noctuelle craintive, Minime à bande jaune, Gâte-bois, Noctuelle gamma, Orrhodie de l'Airelle, Noctuelle hibou, Noctuelle de l'arroche. Il sont plutôt ornés de couleurs sombres et de motifs marbrés difficiles à discerner.
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Bruno Bellamy @brunobellamy.bsky.social · 16/09/2026
Le #puritanisme de certains rézosocios n'a de cesse de m'épater… Récit documenté d'une récente mésaventure avec #Meta : fr.tipeee.com/bruno-bellam... et, surtout, mes remerciements à tous les gens qui persistent à me soutenir ! :) #bellaminettes #censure #noAI #merci @tipeee.bsky.social
Croquis reprenant les personnages (une bellaminette en petite tenue et son chat, initialement représentés dans une simple scène de petit déjeuner, où la bellaminette tenait une tartine, et de l'autre caressait son chat qui dormait près d'elle) qu'un algorithme de modération de FB a donc considérés comme représentant possiblement un acte sexuel… Dans ce nouveau dessin, le chat demande "sérieusement, qu'est-ce que tu comptais faire avec cette tartine ?!", à quoi la bellaminette (qui tient toujours sa tartine), catastrophée, et se couvrant le visage de sa main libre, répond "je… j'ai tellement honte !".
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Bruno Levy @brunolevy01.bsky.social · 15/09/2026
Our article with F. Nikakhtar, R. K. Sheth, N. Padmanabhan and R. Mohayaee on Optimal Transport-based Early Universe Reconstruction accepted in Physical Review D! We demonstrate how our method works for a class of "local" primordial non-Gaussian fields. Preprint here: arxiv.org/abs/2606.01529
arxiv.org
Optimal Transport Reconstruction of Biased Tracers in Primordial Non-Gaussian Fields
Optimal transport provides an efficient method to infer the displacement of objects by mapping their initial positions to their present-day locations over cosmic time; equivalently, it enables the rec...
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Reposted by Bruno Levy
Matthieu Chavent @matthchavent.bsky.social · 12/09/2026
Almost 20 years ago, my first author article was about the Molecular Skin Surface under @brunolevy01.bsky.social supervision: www.sciencedirect.com/science/arti... Now, the Molecular Skin Surface is back in the webbrowser!
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Bruno Levy @brunolevy01.bsky.social · 03/09/2026
A fantastic day of preparation with Roya Mohayaee, Charles Dapogny and Edouard Oudet at Institut d'Astrophysique de Paris. Countdown will start shortly. Those who know know 😉. Wish us good luck !
Roya Mohayaee, Charles Dapogny, Edouard Oudet and Bruno Levy. On the background, the ceiling at IAP decorated with the CMB.
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Bruno Levy @brunolevy01.bsky.social · 02/09/2026
Vibe coding in #geogram: Claude and ChatGPT know it very well !!
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Bruno Levy @brunolevy01.bsky.social · 01/09/2026
#geogram just reached 2500 stars on github, And that's not all, version 1.10.1 was just released: github.com/BrunoLevy/ge... Geogram is in C++, but it also supports Python, Node.js, WebAssembly, TypeScript and Lua through Rosetta by Frantz Maerten, more on this here: github.com/rosetta-bind...
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Chloé Woitier @chloew.bsky.social · 18/08/2026
Merci le service public de se pencher sur le fléau des affiches faites par IA youtu.be/pIYJa0Hzvys?...
youtu.be
Les affiches faites par IA : un fléau graphique ?
YouTube video by France Culture
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Hiroki Sayama @hirokisayama.bsky.social · 18/08/2026
I was busy chaining a session in the yesterday afternoon at #ALIFE2026 My favorite: Greg Turk showed an amazing extension of Langton's ants with memory ("Turmites", with Tur coming from Turing) They can draw Dragon curves and even perform JvN-style self-replication!! 🤯🐜
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Bruno Levy @brunolevy01.bsky.social · 13/08/2026
Solar eclipse
Solar eclipse symbolized by lego luxo junior's ball passing in front of lamp
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Bruno Levy @brunolevy01.bsky.social · 27/07/2026
My son just participated to a game jam. With a friend they created this puzzle game in 4 days ! owomelete.itch.io/catterplosion
owomelete.itch.io
Catterplosion by OwOmelete, wibix
Help Wiggle The Galaxy Swallower of Eternal Despair make his childrens become butterflys !
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Bruno Levy @brunolevy01.bsky.social · 23/07/2026
Oops, I completely forgot to print my poster for the Q&A session after the SIGGRAPH presentation... Let us try to fix this...
my hand-drawn poster for SIGGRAPH
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Bruno Levy @brunolevy01.bsky.social · 17/07/2026
An effect of the heat wave in France ? No, getting ready with Cyprien Plateau-Holleville for our course at @acmsiggraph.bsky.social don't miss it ! Sunday, 9am to 12:15pm, room 408 B
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Bruno Levy @brunolevy01.bsky.social · 16/07/2026
Packing my bags for ACM SIGGRAPH and rehearsing for: - Sunday the 19th - 9am to 12:15pm: course on fluid simulation and optimal transport with @pltc.bsky.social - Thursday the 23th - 10:45am to 12:35pm: Exact predicates and exact constructions for mesh CSG (TOG article)
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Bruno Levy @brunolevy01.bsky.social · 16/07/2026
Super happy to give this course with @pltc.bsky.social next Sunday at #SIGGRAPH2026 !
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Reposted by Bruno Levy
Hacker News 20 @betterhn20.e-work.xyz · 02/07/2026
The gauge broke: devs felt 20% faster with AI, measured 19% slower intrepidkarthi.com/writing/the-gaug… (news.ycombinator.com/item?id=487574…)
intrepidkarthi.com
The gauge broke · intrepidkarthi
For two years I argued the feeling of AI speed had come apart from the fact of it, from watching my own teams. This summer it stopped being an anecdote. A controlled trial measured experienced developers feeling about 20% faster while running about 19% slower. The instrument we steer by reads backward.
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Bruno Levy @brunolevy01.bsky.social · 26/06/2026
A week in Institut d'astrophysique de Paris with R. Mohayaee, A. Lukas and T. Rhys Harvey, on Calabi-Yau manifolds. BTW, this image is not a CY ! it is just a couple of cross-sections. Now working on 6D FEM to solve the complex Monge-Ampère equation. ... no body hears you scream in high-D space !
Cropped cross-sections of the geometric support of a Calabi-Yau manifold
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Reposted by Bruno Levy
Gabriel Peyré @gabrielpeyre.bsky.social · 16/06/2026
The alpha version of my new book "Optimal Transport for Machine Learners" is out, with in particular an online version with interactive figures www.gpeyre.com/ot4ml/
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Jacco Bikker 🎦 @jbikker.bsky.social · 03/06/2026
Chris Hanson put the source code to the Amiga Juggler demo (1987, by Eric Graham) on GitHub. More info here: alphapixeldev.com/recovering-e... Repo: github.com/AlphaPixel/E...
alphapixeldev.com
Recovering Eric Graham's 1987 Amiga Juggler raytracer source code - AlphaPixel Software Development
Recovering Eric Graham's 1987 Juggler raytracer source code AlphaPixel often gets involved with modernizing and updating old performance and graphics code. Sometimes that means client work under NDA. ...
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Bruno Levy @brunolevy01.bsky.social · 03/06/2026
Still working on hashtag#geogram / geogram+ / Tessael boolean operations for meshes, Making them faster without sacrifying robustness and generality. More to come ... (this test suggested by Cyprien Plateau Holleville)
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Bruno Levy @brunolevy01.bsky.social · 28/05/2026
geogram 1.10.0 is out ! github.com/BrunoLevy/ge... It is a programming library of geometric algorithms, used in Tessael's Geo2 (www.tessael.com) and NASA - National Aeronautics and Space Administration Launch, Ascent and Vehicle Aerodynamics (www.nas.nasa.gov/LAVA/)
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YosysHQ @yosyshq.com · 27/05/2026
$1200 too much for a Vivado license? How about: $0 - Yosys $0 - nextpnr $0 - OpenROAD $30 -Subnautica 2 $30 - Blahaj $180 - Glasgow interface explorer from @crowdsupply.bsky.social $950 -160kum^2 of Sky130 silicon + ASIC from @tinytapeout.com #opensource #FPGA #ASIC
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Bruno Levy @brunolevy01.bsky.social · 22/05/2026
Working with Cyprien Plateau-Holleville, Charles Dapogny, Edouard Oudet and Roya Mohayaee on shape optimization / partial optimal transport. A lot of work remains to do (in particular, Virtual Element method in 3D) Preprint (2D version) here: arxiv.org/abs/2409.07873
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Bruno Levy @brunolevy01.bsky.social · 15/05/2026
Working on Scalable Optimal Transport with R. Mohayaee, C. Dapogny and E. Oudet: more than 1 billion particles ! ➡️ use algebraic multigrid preconditioner (AMGCL) ➡️ rewrite GPU backend: no limit on matrix size, supports multi-GPU ! ➡️ Available in OpenNL: github.com/BrunoLevy/Op...
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Chloé Woitier @chloew.bsky.social · 15/05/2026
IA : qui est Cerebras, ce rival de Nvidia qui a réalisé la plus grosse introduction en Bourse de l’année ? www.lefigaro.fr/secteur/high...
lefigaro.fr
IA : qui est Cerebras, ce rival de Nvidia qui a réalisé la plus grosse introduction en Bourse de l’année ?
DÉCRYPTAGE - Ce concepteur américain de puces IA a secoué le Nasdaq jeudi et vaut désormais plus de 80 milliards de dollars. Il a su se positionner sur un créneau qui s’est avéré porteur.
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Chloé Woitier @chloew.bsky.social · 14/05/2026
😱 J'ai fait un podcast 😱 Ou plus exactement j'ai été invitée dans l'émission Twitch "Stonks" de Arthur Perticoz pour parler en détail de la crise qui secoue le monde du jeu vidéo, avec un focus sur Ubisoft et Nacon mais pas que ! Ca dure 1h45, bonne écoute ! open.spotify.com/episode/7m8P...
open.spotify.com
Pourquoi l'industrie du jeu vidéo est en danger - Hors-série avec Chloé Woitier
Spotify video
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Flux @willflux.bsky.social · 09/05/2026
Have you upgraded your @yosyshq.com yosys recently? #FPGA 0.49 (Jan 2025): TRELLIS_COMB: 4357 0.64 (May 2026): TRELLIS_COMB: 3682 15% LUT saving with no change in my Verilog design. 👏
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Bruno Levy @brunolevy01.bsky.social · 13/05/2026
Plouf ! Our @eurographicsc.bsky.social course notes on Optimal Transport for Fluids, New and Old, with @pltc.bsky.social are out, here: diglib.eg.org/items/68a801...
a hand-drawn crown splash. Why ? Why not !
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Bruno Levy @brunolevy01.bsky.social · 12/05/2026
All lights green: #geogram works fine with Visual C++ 2026 (and all modern compilers)
CI: 0 error, 0 warning and all lights green
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Bruno Levy @brunolevy01.bsky.social · 12/05/2026
New results: adventures in redshift space, with Roya Mohayaee, Charles Dapogny and Edouard Oudet What's that ? Millenium falcon going to hyperspace ? No, redshift distortions: uncertainties on galaxy clusters positions due to their relative motions. Our new algo. gives encouraging results in 2D
what's that ? millenium falcon going to hyperspace ? No ! redshift distortion.Redshift distortions are radial uncertainties on galaxy cluster positions due to their relative velocitiesCan we solve them using Optimal Transport ? Yes, but the rightmost term of the derivative is problematic (impossible to compute directly)When you are stuck behind a slow truck on the highway, you can change lane ! In mathematical terms, this means computing an adjoint state, and using it to compute the derivatives that we need.
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Bruno Levy @brunolevy01.bsky.social · 11/05/2026
Playing with geogram+ from Tessael. I want robust and accurate boolean operations / CSG with meshes I also want them to run fast Why should I choose ? Tessael developed geogram+, an enhanced version of geogram. Playing with it in Python, in Polyscope, using Tessael's "ALLOY" interop middleware.
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Bruno Levy @brunolevy01.bsky.social · 10/05/2026
Back from Eurographics Conference, seen many great talks there, and more importantly, seen many friends! Amir Vaxman, Jos Stam,Michela Spagnuolo, George Drettakis, Lourdes Agapito, Mark Alexa, Anatole Lécuyer, Raphaëlle Chaine, Shimin Hu, Leif Kobbelt and many others ! Next stop, SIGGRAPH 2026 !
Collage of photos with friends at Eurographics 2026 in Aachen
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Bruno Levy @brunolevy01.bsky.social · 03/05/2026
Packing my luggage for Eurographics Conference and fixing some last minute details for our course with Cyprien Plateau-Holleville on fluid simulation with Optimal Transport, Monday afternoon. See you there !
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Bruno Levy @brunolevy01.bsky.social · 01/05/2026
Fun with semi-discrete Optimal Transport (getting ready for our course at Eurographics Conference next Monday and ACM SIGGRAPH in July with Cyprien Plateau-Holleville)
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Matthieu Schaller @mschaller.bsky.social · 28/04/2026
Happy to eventually release this very large dataset of cosmological simulations, including the largest run ever done. Was all fun to do with the @swiftsimulation.bsky.social code, now for everyone to play freely with the data!
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Bruno Levy @brunolevy01.bsky.social · 28/04/2026
Preparing for our course "Optimal Transport Based fluid simulation: New and Old" with Cyprien Plateau-Holleville (EUROGRAPHICS and SIGGRAPH) 2D simulation of "droplet hurdles race" (De Maleprade et.al). Features high surface tension, viscosity and fluid boundary - domain interactions.
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Bruno Levy @brunolevy01.bsky.social · 27/04/2026
Thrilled ! My GEOGRAM software library is used by NASA AMES center, in their Launch & Ascent Vehicle Aerodynamics software. GEOGRAM is used in their Voronoi meshing component. - www.nas.nasa.gov/LAVA - ntrs.nasa.gov/api/citation... - www.nas.nasa.gov/LAVA/print_p...
NASA LAVA website, featuring a nice unstructured mesh generated with GEOGRAM.GEOGRAM in LAVA software license and credits !High lift prediction. Behind the scene, a large unstructured mesh computed with the help of GEOGRAM !A nice unstructured mesh around a plane engine.
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Hacker News 20 @betterhn20.e-work.xyz · 25/04/2026
Hokusai and Tesselations dl.ndl.go.jp/pid/1899550/1/11 (news.ycombinator.com/item?id=479029…)
dl.ndl.go.jp
Hokusai and Tesselations
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Bruno Levy @brunolevy01.bsky.social · 22/04/2026
We will give with Cyprien Plateau-Holleville a course on Fluid Simulation with Optimal Transport: New and Old at: - Eurographics 2026 (May 4-8, Aachen) - SIGGRAPH 2026 (July 19-23, LA) Featuring: - Gentle introduction to OT - Create your own OT at home - Fluid sim with OT See you there !
Simulation of a splash using optimal transport
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Bruno Levy @brunolevy01.bsky.social · 13/04/2026
Participating to the 30 years anniversary of CGAL !! 🤩 It will be the occasion to meet friends, discuss about geometric algorithms, and discuss about strategies for developing and maintaining Open-Source software over decades. Looking forward to see you there ! www.cgal.org/2026/04/07/O...
The G letter of the CGAL logo and the GEOGRAM logo together on the same image.An anniversary cake for the 30 years of CGAL modeled in OpenSCAD and displayed in Graphite, shamelessly generated using ChatGPT.
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Bruno Levy @brunolevy01.bsky.social · 10/04/2026
"In search of optimal transportation", A nice article about our ParMA team: www.inria.fr/en/transport...
A 2D mock example of Early Universe Reconstruction, with the reconstructed trajectories of the galaxy clusters.
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Bruno Levy @brunolevy01.bsky.social · 08/04/2026
Ooh, #geogram 1.9.9 is out ! What's geogram ? What, you don't know already ? What are you waiting for ? Take a look here ⤵️ github.com/BrunoLevy/ge...
A complicated mesh CSG operation computed with Geogram
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Bruno Levy @brunolevy01.bsky.social · 07/04/2026
On my was for a meeting at Institut d'astrophysique de Paris on Optimal Transport and Physics with Roya Mohayaee, Christian Leonard, Yann Brenier, Jesse Thaler and Ghambhir Rikab.
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Randall Munroe @xkcd.com · 06/04/2026
Day Counter xkcd.com/3228/
Comic. [Sign above four people. A person sits at a desk working on a laptop. A person with ponytail is talking to person with white hat. A person with short hair walks away.] SIGN: It has been [-0.00000000000000044] days since our last floating point error
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Bruno Levy @brunolevy01.bsky.social · 03/04/2026
🤩 awesome!!! 🤩
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Bruno Levy @brunolevy01.bsky.social · 30/03/2026
On the train back from @acmsiggraph.bsky.social IPC, fighting jetlag: programming is a good way to stay awake. New Dear Imgui bindings for Lua (Graphite seems to still work) 314 functions (+ 52 imdrawlist functions) github.com/BrunoLevy/im...
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Bruno Levy @brunolevy01.bsky.social · 30/03/2026
The ACM SIGGRAPH TPC meeting is a unique occasion to see friends and stars of computer graphics research ! Now flying back to france after two busy days of paper selection and discussions plus a workshop with flash talks on hot topics. Justin Solomon Miri Ben-Chen thank you for the fantastic work!
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Bruno Levy @brunolevy01.bsky.social · 29/03/2026
Lua bindings for @ocornut.bsky.social's dear imgui were unmaintained / incompatible with new versions. So I forked and rewrote them, here: github.com/BrunoLevy/im...
github.com
GitHub - BrunoLevy/imgui_lua_bindings_gomgen: Function bindings for ImGui in lua
Function bindings for ImGui in lua. Contribute to BrunoLevy/imgui_lua_bindings_gomgen development by creating an account on GitHub.
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Freya Holmér @freya.bsky.social · 26/03/2026
I'm almost there it's so pretty!! 😭 this is the first time I've made extensive use of complex numbers in shader code, which has been fun! it's an analytic 2D lighting system through piecewise conformal maps representing angular light/"sky" exposure, which means you get fully analytic penumbras!
a partially finished analytic 2D lighting solution, showing both the angular and radial component with a checkerboard pattern and color coding
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