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/

Claude Fable has a certain clarity of thought in English. It says stuff that sounds like a smart person, not a compressed AI shoggoth. Interestingly, it still isn’t very good at API taste.

Still having fun building papaya.io. Just implemented a pretty nifty compressed export feature, with swipe to compare. Supports JPEG, WebP and PNG compression for now.

I'm trying out zed.dev since they announced v1.0. It feels like a real labor of love, and had no rough edges in my first day of using it. Comes with batteries included, and things Just Work. Feels more suited to my agent-heavy workflow than VS Code.

(🧵 1/6) Recently I've been working on an HLSL interpreter, which can execute shader code entirely on the CPU github.com/pema99/HLSLI... I used it to make a cute little interactive debugger demo. You can try it yourself at pema.dev/hlsl/

Zig 0.16.0 is out, including the new IO interface, and a strong step towards incremental compilation: ziglang.org/download/0.1...

Implemented some fun stroke dynamics based on mouse speed in papaya.io in an evening.

👀

I had an index variable that kept track of the latest processed element in a list. gpt-5.3-codex today named it `watermark`, and I cannot get over the beauty of it.

Qaws (قوس) Arabic for *arc*, *bow*, *curve*. A dependency-free C11 library for creating, evaluating, sampling, traversing, and inspecting parametric curves and surfaces in 2D and 3D. A dependency-free C11 library for parametric curves and surfaces in 2D/3D. 1/13

oh that is awesome, well deserved! congrats @ocornut.bsky.social

I just vibe-coded a tax calculator: taxman.dk Here's a blog post about it: apoorvaj.io/vibe-coding-...

This was also my experience with Steve Yegge's Gas Town (steve-yegge.medium.com/welcome-to-g...). Total jank, but there's a kernel of a really powerful idea in there.

Tried OpenClaw to eval the hype. It's janky af; couldn't get it to work in an hour of troubleshooting in Docker. Pure vibes coding is still a trash fire, but someone's going to build a very smooth version of this, and it's going to be 🔥.

I watch @smartereveryday.bsky.social ’s video on the nuclear power plant and there was one offhand comment by someone who works there about how “nuclear radiation” (specifically Cherenkov radiation) is blue, but “everyone thinks it’s green”.

New blog post: Stop over-engineering static websites apoorvaj.io/stop-overeng...

https://mitchellh.com/writing/zig-builds-getting-faster

I feel that Claude Code + Sonnet writes way more tasteful Zig code than it does JavaScript. JS is littered with dumb defensive programming, with null checks or conditions where here should be asserts. My theory is that this is because of the delta in the quality of Zig vs JS human training data.

Insanely well-made video on EUV photolithography: www.youtube.com/watch?v=B248...

New blog post: Testing that works apoorvaj.io/testing-that...

This was an easy one to implement. Then I started on white balance, fell into a rabbit hole of black body radiation and color spaces, and then noped out for a bit.

Holy crap, #ziglang 0.14 -> 0.15.1 is quite the breaking change. This is literally 5% of @papaya.io's Zig codebase.

I'm really proud of this. 1. Unlike many other web-based image editors, papaya.io rasterizes text in WebAssembly. This means that text rendering looks the same across browsers or OSes. 2. This means that I had to re-implement a text box, which was not fun. ...

A new article on my site: Approximate first principal component It describes simple trick to estimate the direction of most spread of a bunch of points without running a full PCA. Includes my Python re-implementation and plots of some quick tests. 30fps.net/pages/approx...

Zig's New Async I/O https://kristoff.it/blog/zig-new-async-io/

The Zig 2026 roadmap is absolute fire. Andrew and team are playing the long game, and it's really starting to pay off big time—incremental compilation, async await, cross compilation, fuzzing, and more. www.youtube.com/watch?v=x3hO...

Mikko and I added MacOS-style keyboard navigation to the Skribidi text library. github.com/memononen/Sk...

*Tin foil hat* Has Google added a special case for Google Docs in Chrome to show the MacOS accent menu in the right spot? It renders out of the window in Firefox, which is what you'd expect to happen when using a hidden textbox to get input. I cannot find a web API do this. Looks like an inside job.

Still long way to go, but got the beginnings of IME text composition working in papaya.io. I'm super impressed that @mikkomononen.bsky.social's Skribidi library even has this feature. Here's a video of me typing in '⌥-u' and then 'o' on Mac, which results in 'ö'.

Got simplified Chinese and FreeType variable font rendering to work in papaya.io.

Multi-script rendering in papaya.io is starting to come together. Here's glyph caching and retrieval across several fonts (including an emoji font)!

Added intermingled rendering of Latin and emoji (from different font files) to papaya.io. (Also look at that automatic word-wrapping and left-alignment, courtesy of Skribidi!)

Emoji font rendering in papaya.io with @mikkomononen.bsky.social's github.com/memononen/Sk... library. Next up: intermingling font and emoji rendering.

I just published the bidi text stuff I have been working the past months. It's called Skribidi (because all text and font related things need funny name for some reason). github.com/memononen/Sk...

Started implementing text rendering for papaya.io. Got FreeType and HarfBuzz compiling to WebAssembly. Here's a demo of kerning working with Roboto.

Just relaunched papaya.io — a web-based image editor I've been building on nights and weekends. What's new: - .ppy file format for local saves - Automatic browser persistence - WebP import/export support Building fast and shipping features regularly. Try it out — feedback very welcome.

An update, a bit of retrospection, and a call for you, yes, you, to help JCGT a bit: www.realtimerendering.com/blog/jcgt-is...

I wrote a blog post about mipmap level selection. pema.dev/2025/05/09/m...

These pruned trees enable efficient evaluation of the SDF for rendering or discretization, resulting in >100x speedups for complex scenes compared to brute-force evaluation. Come to my talk next week for more details, or read the paper here: wbrbr.org/publications...

I'm glad somebody out there is brave enough to push back against the "personal ChatGPT usage is terrible for the environment" message andymasley.substack.com/p/a-cheat-sh...

Prematurely quoting papers you clearly did not read is the root of all evil.

File Pilot just came to open beta today, and it already feels way better than Windows File Explorer. filepilot.tech

Delve into the creation of the main character featured in Unity's Time Ghost, a real-time cinematic crafted with Unity 6. Watch here: shorturl.at/BvN5S Download a sample of the character, including the ML model from this link: shorturl.at/9E5F5 #Unity6 #Gamedev

NVIDIA Blackwell whitepaper is available: images.nvidia.com/aem-dam/Solu...

DeepSeek R1 is the first time I've felt a computer be actually intelligent. Given a math problem, it uses inference-time scaling to try thinking through various angles in a way I've never seen before.

Zig 0.14.0 release date has been set to mid February! https://ziglang.org/news/what-to-expect-from-release-month/

Spotted some DirectX code in the movie Mars Express. www.imdb.com/title/tt2691...

“We’re going to be the social network that lets you - encourages you - to say slurs”

You cannot get physically-based rendering right without understanding radiometry. My new blog post explains it all, relying on familiar concepts from rendering algorithms as much as possible. Part 2 will come next week. momentsingraphics.de/Radiometry1B...