Axel Paris

🌐 Webpage: aparis69.github.io/SphereCarvin...

🔗 Code: github.com/H-Schott/Sph...

📽️ Video: www.youtube.com/watch?v=fekn...

Different types of bound can be used - and it is even relatively simple to extract not only one, but multiple convex bounds around the object, with guarantees!

In practice, a usable bound can be extracted instantaneously for exact and quasi exact SDFs (50 queries). For more conservative functions where the SDF is a "bad" distance estimate (the distance is largely under estimated), then more iterations are required.

Sphere carving has the same general requirement than Sphere Tracing: as long as the function provides a conservative distance estimate (lower-bound), then the algorithm is guaranteed to converge to the shape.

Instead, Sphere carving iteratively approaches the surface by leveraging the SDF. Field function queries define a set of empty spheres, from which we extract intersection points that are used march towards the surface. The final point set has the property that the convex hull bounds the shape.

A "naive" approach for such task would be to densely sample the SDF & extract a bound using a bounding box or convex hull of the samples. This is however expensive (lots of queries) even on GPU, especially if the SDF is made of thousands of primitives.

📜 New SIGGRAPH 2025 paper 🎉

❔How to compute bounding volumes for procedural Signed Distance Fields (SDFs)? This is not so trivial!

💡We propose a simple method called Sphere Carving. It extracts (convex) bounding volumes around SDFs, requires very few evaluations, and is GPU compatible.

We're looking forward to presenting our talk at #SIGGRAPH2025 on Sunday Aug. 10 - 11AM, in West Building, Rooms 301-305!

Caisse de grève Virtuos Faire un don à Syndicat des Travailleurs et Travailleuses du Jeu Video - Caisse de grève Virtuos

🇬🇧 ✊ Virtuos France is on strike! After the success of Oblivion Remastered, management decided to reward the team with…A layoffs plan.

A strike has started on July 10th and our comrades need support. STJV set up a strike fund:

www.helloasso.com/as...

Caisse de grève Virtuos Faire un don à Syndicat des Travailleurs et Travailleuses du Jeu Video - Caisse de grève Virtuos

✊ Virtuos en grève ! Après avoir sorti Oblivion Remastered avec un grand succès, la direction récompense les équipes avec…Un plan de licenciements.

La mobilisation a démarré le 10 juillet et iels ont besoin de soutien. Le STJV a mis en place une caisse de grève :

www.helloasso.com/as...

I'm so happy to share that the stairs update is liiiiiive. This is by far our biggest update that we've been cooking since *checks calendar* omg, since March x_x Huge thanks to everyone who helped us test it while in beta <3

Now lemme walk you through some of the new shinies 🧵

Hardware virtual textures look like a marvelous tool for large terrains or volume compression.
Alas, they are in a sad state in terms of performance and usability. And strangely, the (very bad) binding perfs varies a lot with the driver.
→ read here: hal.science/hal-05138369
@rcmz0.bsky.social

Nice blog post! It mentions a dataset with thousands of chat conversation ending with "thank you notes". Do you plan on making it public? I guess one solution to this would be to remove the polite mentions from the request in a preprocess.
Having the dataset you used would be helpful with that!

The surface mesh of a landscape (top left) is enriched with tens of millions of grass blades, designed in path traced in real time using a procedural density map (bottom left).

Triangles offer a natural strata to layout efficient non uniform random sampling on meshes. Our triangle rejection sampling reaches 10B samples/sec, which can feed primitive instancing, fiber distributions or emissivity sampling. Details in our HPG25 paper: research.adobe.com/publication/...

Another 🧵 on (almost) everything (interesting) about evaluating distances and closest points to quadratic Bezier curves

Si vous vous posez des questions sur la consommation d'eau des data centers, voici un document plutôt écrit grand public sur ce sujet, par les collègues d'EcoInfo (et je ne dis pas cela parce que je connais 3 des 4 auteur(e)s):

hal.science/hal-04698568...

Open Letter to the SIGGRAPH Leadership RE: Call for SIGGRAPH Asia to relocate from Malaysia and commit to a venue selection process that safeguards LGBTQ+ and other at-risk communities. To the SIGGRAPH Leadership: SIGGRAPH Executive Commit...

Holding SIGGRAPH Asia 2026 in Malaysia is a slap in the face to the rights of LGBTQ+ people. Especially now, when underrepresented people need as much support as we can possibly give them ! Angry like me ? Sign this open letter to let them know. 🏳️‍⚧️🏳️‍🌈

docs.google.com/document/d/1...

Do you like voxels and implicits' representations and wish you could animate them in real-time?
Now you can!
Check out our article: "Real-time rendering of animated meshless representations" to know how: hal.science/hal-05095359
Shout out to @pacomeluton.bsky.social for this fantastic work!

Graphics Programming weekly - Issue 392 - May 18th, 2025 www.jendrikillner.com/post/graphic...

MOTIVATION Graphical Processing Units (GPUs) are at the core of Computer Graphics research. These chips are critical for rendering images, processing geometric data, and training machine learning models. Yet, the production and disposal of GPUs emits CO2 and results in toxic e-waste [1]. METHOD We surveyed 888 papers presented at SIGGRAPH (premier conference for computer graphics research), from 2018 to 2024, and systematically gathered GPU models cited in the text. We then contextualize the hardware reported in papers with publicly available data of consumers’ hardware [2, 3]. REFERENCES [1] CRAWFORD, KATE. The Atlas of AI: Power, Politics, and the Planetary Costs of Artificial Intelligence. Yale University Press, 2021. [2] STEAM. Steam Hardware Survey. https://store.steampowered.com/hwsurvey [3] BLENDER. Blender Open Data. https://opendata.blender.org

Ever wondered how badly we're all addicted to buying new GPUs in graphics labs?

Come see our talk at #SIGGRAPH2025 to discuss how we can collectively move "Towards a sustainable use of GPUs in Graphics Research"

with @elie-michel.bsky.social @axelparis.bsky.social Octave Crespel and Felix Hähnlein

The irony of writing an op-ed about how we need more numbers about AI's energy usage... and getting publicly attacked by corporate greenwashers about the fact that the numbers I use are inaccurate.
I mean, yes, surely, but... the only way to prove that is by reporting them in the first place? 🤷

Si on accepte ça aujourd'hui de @info.gouv.fr ça ne s'arrêtera pas. Je refuse que l'État contribue à de la désinformation historique alors qu'il y a tant de fonds d'archives à valoriser avec le travail précieux d'historiens. Et on peut faire des reconstitutions plutôt que de s'en remettre à des LLM.

Thank you to everyone speaking up about this publicly. I am unsure why it had to come to this, but I sincerely hope that SIGGRAPH Asia will reverse course.

alecjacobson.com/weblog/siggr...

Après son virage pro-Trump, Mark Zuckerberg ferme son école pour enfants défavorisés The Primary School, l’établissement privé gratuit que le fondateur de Facebook et son épouse avaient fondé dans la Silicon Valley, devrait cesser d’exister en 2026.

Après son virage pro-Trump, Mark Zuckerberg ferme son école pour enfants défavorisés

Wilhem receiving the award on stage

🏅Honored to have been awarded at #Eurographics25 for our paper on #LipschitzPruning to speed-up SDF rendering!

👉 The paper's page: wbrbr.org/publications...

Congrats to @wbrbr.bsky.social, M. Sanchez, @axelparis.bsky.social, T. Lambert, @tamyboubekeur.bsky.social, M. Paulin and T. Thonat!

I can tell you that we'd like to, but non promise atm. We'll do our best given our constraints - many of us are big fans of open sourcing in général.

I totally agree that releasing nice examples of hierarchical SDFs would benefit the community!

Interesting writeup! Thanks your for the kind words. Nice to see your take after working on this project this past year.

This is based on "Lipschitz Pruning: Hierarchical Simplification of Primitive-Based SDFs", a new Eurographics paper from researchers at IRIT and Adobe Research (including @wbrbr.bsky.social):

wbrbr.org/publications...

It's very cool stuff, check it out!

Implicit surfaces are great, but if you are not Inigo Quilez, it's really hard to control how they look...

That's why I'm really proud to annonce our Eurographics 2025 paper: "Implicit UVs: Real-time semi-global parameterization of implicit surfaces".