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Bruno Levy

@brunolevy01.bsky.social

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

311 Posts1149 Follower418 Folgt
Bruno Levy@brunolevy01.bsky.social · 3w ago

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)

Hacker News 20@betterhn20.e-work.xyz · last mo.

The gauge broke: devs felt 20% faster with AI, measured 19% slower https://intrepidkarthi.com/writing/the-gauge-broke/ (https://news.ycombinator.com/item?id=48757440)

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.

intrepidkarthi.com

Bruno Levy@brunolevy01.bsky.social · last mo.

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
Jacco Bikker 🎦@jbikker.bsky.social · 2mo ago

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...

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. ...

alphapixeldev.com

Bruno Levy@brunolevy01.bsky.social · 2mo ago

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)

Chloé Woitier@chloew.bsky.social · 3mo ago

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...

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.

lefigaro.fr

Bruno Levy@brunolevy01.bsky.social · 3mo ago

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.
Bruno Levy@brunolevy01.bsky.social · 3mo ago

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.

Bruno Levy@brunolevy01.bsky.social · 3mo ago

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
Bruno Levy@brunolevy01.bsky.social · 3mo ago

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 !

Matthieu Schaller@mschaller.bsky.social · 3mo ago

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!

@dirac-hpc.bsky.social · 3mo ago

Astronomers have released one of the largest cosmological simulation datasets ever — 2.5 petabytes of virtual universe data, run on DiRAC's COSMA8 supercomputer and now open to all. Full article at our website: dirac.ac.uk/facility_upd...

Bruno Levy@brunolevy01.bsky.social · 3mo ago

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.

Bruno Levy@brunolevy01.bsky.social · 4mo ago

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