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Jaakko Lehtinen

@jaakkolehtinen

Generative AI and computer graphics at Aalto University & NVIDIA Research. @ellis.eu Fellow. https://users.aalto.fi/~lehtinj7

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11.11.2024
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Latest posts by Jaakko Lehtinen @jaakkolehtinen

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Metal inline ray tracing support by fknfilewalker · Pull Request #9926 · shader-slang/slang Add metal inline ray tracing support to slang. Most of the work is done and also test tests/pipeline/ray-tracing/trace-ray-inline.slang works. The one thing that I need some feedback on is the way ...

Wow, apparently this is bubbling under as I write this! github.com/shader-slang...

09.02.2026 17:39 👍 2 🔁 0 💬 0 📌 0

Apparently it’s impossible to write a single compute shader with inline HW ray queries that would run on Windows, Linux, and MacOS, even if you do separate backends for VK&Metal.

Slang comes close, but does not (yet?) do inline RT on Metal. And MoltenVK doesn’t do RT.

Other takes?

09.02.2026 17:37 👍 3 🔁 0 💬 1 📌 0

Makes me think of Unity. I wrote code for big games back in the day, and I know pretty well what’s going on under the hood. Yet I was utterly and completely lost with Unity when I tried looking at it. “Made easier for non-programmers” seems to mean opaque and magical; do dance X to make Y happen..

27.01.2026 17:27 👍 1 🔁 0 💬 0 📌 0

I’m beginning to be convinced there isn’t a single job for which Pandas is a top-3 contender for best tool.

27.01.2026 16:21 👍 3 🔁 0 💬 1 📌 0

“Please let us know whether you are able to review this article[…] We would hope to receive your report by 26 December, but if you need more time we would be happy to extend this.”

Yeah sure, sign me up!

15.12.2025 13:35 👍 7 🔁 0 💬 0 📌 0

Have people thought of using reinforcement learning for playing what-if games to study the potential effects of large policy changes beyond first order? Comes to mind seeing the circus associated with recent changes in the Finnish public healthcare funding

28.11.2025 07:27 👍 6 🔁 0 💬 2 📌 0

I’m glad they think about this stuff!

21.11.2025 00:04 👍 2 🔁 0 💬 0 📌 0
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I’ve long thought the most immediate use for XR glasses would be ad blocking.

ChatGPT 5.1’s take below. Maybe time for an art/social commentary project using a high-quality passthrough VR headset like Varjo’s? I bet you could distill this into a real-time model good enough for making the point.

19.11.2025 11:39 👍 10 🔁 1 💬 2 📌 1

Thanks Bart, will have to check this out!

17.10.2025 19:33 👍 1 🔁 0 💬 0 📌 0

In anticipation of seeing the new Spinal Tap next week we watched the original.

It’s probably 20y+ since I saw it last, and though I loved it then, my memory still didn’t quite do it justice. A true masterpiece. Man!

(Heads up: Nigel Tufnel day, 11/11, is coming up fast.)

17.10.2025 19:32 👍 0 🔁 0 💬 0 📌 0

iOS 26 is a clear design regression. UI colors appear washed out in a manner that reminds me of the disgusting early 2000s “HDR” aesthetic, and the Liquid Glass look is gimmicky. The whole thing has an air of poor taste.

10.10.2025 06:10 👍 5 🔁 0 💬 1 📌 0
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@economist.com Your questionnaire on push notifications doesn’t let me tell you I don’t allow them from any of the news apps I use 😅

22.07.2025 15:33 👍 2 🔁 0 💬 0 📌 0
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If you plan on skimping on LED density in your fancy indirect lighting à la mode, don’t use glossy materials directly below..

08.05.2025 07:32 👍 5 🔁 0 💬 0 📌 0
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Did you know SVG and Inkscape support instancing? There's even a "Create Tiled Clones" feature in the latter.

Dread the idea of drawing something like this with the raw positioning tools and copy/paste; no way to edit the appearance of the individual tiles in bulk.

28.03.2025 12:45 👍 7 🔁 0 💬 0 📌 0

“If it’s smart, it’s vulnerable” says Mikko Hyppönen — but @nurpax.bsky.social‘s version

“if it’s smart, it’s sh*t”

is IMO even better

27.03.2025 08:44 👍 8 🔁 0 💬 0 📌 0

Great watching and learning from the stable genius 🤯

28.02.2025 19:14 👍 3 🔁 0 💬 0 📌 0
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Is Ravi & Pat’s 2001 classic on irradiance environment maps missing a factor of 1/pi from Eq. 2? Sure seems that way to me..

27.02.2025 20:18 👍 3 🔁 0 💬 0 📌 0
Logo of ELLIS Institute Finland (line drawn map of Europe)

Logo of ELLIS Institute Finland (line drawn map of Europe)

ELLIS Institute Finland is hiring Principal Investigators in AI + machine learning. World-class resources for research incl. LUMI supercomputer, generous starting package & professorship affiliation with a university in the world’s happiest country! Apply by March 9: ellisinstitute.fi/PI-recruit

04.02.2025 15:16 👍 39 🔁 30 💬 3 📌 4

The rabid guy with the world’s largest megaphone has Wikipedia in his sights.

It’s been a while since I last donated, but I just gave £500.

Please consider giving according to your means.

07.02.2025 09:10 👍 10 🔁 1 💬 0 📌 0

Gosh I needed this amidst all the news

03.02.2025 15:44 👍 5 🔁 0 💬 0 📌 0
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26.01.2025 05:36 👍 184 🔁 22 💬 5 📌 1

I’d happily pay 10s of € more for orders like this if I could just be sure it’s not UPS.

27.01.2025 11:44 👍 3 🔁 0 💬 0 📌 0
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📣 @ec.europa.eu, please force large online retailers to offer consumers choice of courier!

Now I have no way to vote with my € and punish liars like UPS, who continue this charade despite having been exposed for it over and over. (Someone *was* waiting, and I have paid for home delivery. GRRRR.)

27.01.2025 11:38 👍 2 🔁 1 💬 1 📌 0
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A free, powerful Chinese AI model just dropped — but don’t ask it about Tiananmen Square Those who train the AI models get to decide what the truth is....

@edzitron.com on DeepSeek

Good: v3 trained for $5.5m, proving that you don't need to spend half a trillion dollars on new data centers to make great models

MIT licensed! Great for running on my own hardware

Bad: the CCP influence is genuinely a problem for my uses sherwood.news/tech/a-free-...

24.01.2025 19:39 👍 260 🔁 40 💬 20 📌 27

Bravo 👏

An analytic theory of creativity in convolutional diffusion models by Kamb & Ganguli

I’ve wondered about this very problem for two years now, with wispy intuition that points to exactly this. I never got far into experimentation, let alone theory formation. I wish I had written this paper.

15.01.2025 07:54 👍 15 🔁 3 💬 0 📌 2

That makes a lot of sense!

14.01.2025 14:17 👍 4 🔁 0 💬 0 📌 0
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Research Scientist Intern, Generative AI - 2025 NVIDIA is searching for a world-class researcher in generative AI to join our research team. You will be conducting original research for generative AI applications, including the generation of langua...

Our group at NVIDIA Research Helsinki is looking for stellar research interns to work on generative AI!

The positions are on-site only — we believe in high-bandwidth F2F communication.

nvidia.wd5.myworkdayjobs.com/en-US/NVIDIA...

14.01.2025 14:16 👍 14 🔁 3 💬 0 📌 1

The dimension of the orthogonal group O(n) is n(n-1)/2. That’s a surprising result to me intuitively. The (dangerous as always) low-dimensional intuition would suggest they’d be much more rare.

14.01.2025 14:04 👍 2 🔁 0 💬 1 📌 0
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Gutsy move pushing their own shows like this

29.12.2024 18:48 👍 1 🔁 0 💬 0 📌 0
Postdoctoral researcher positions in Probabilistic Machine Learning research group, Aalto University | Aalto University

Planning to think about what to do next over the holidays? I am hiring postdocs to my group in Helsinki, in combinations of the following:

- foundations of (prob) ML
- distribution shifts
- AI-assistance with computationally rational user models
- applications in synthetic biology and biodesign

23.12.2024 13:10 👍 16 🔁 6 💬 1 📌 0