Nice writeup. One thing worth adding to the limitations: without vorticity confinement, the Gauss-Seidel projection step quietly dissipates the small-scale curl that makes smoke look like smoke.
The 2001 Fedkiw/Stam/Jensen "Visual Simulation of Smoke" paper added it back as a correction force for exactly this reason. At N=16 it doesn't matter much because the grid itself can't represent fine vortices, but the moment you crank N up the missing confinement becomes visible.
How big is the lifetime holes thing in practice? On loops the contiguous-interval model spills way more than it should. Wondering if that alone explains most of the YJIT gap.
So the state of AI in 2026: ChatGPT DDoS-lite, Claude the polite one that actually reads the rules, Perplexity maybe shows up, and Google was already in your house.
$180/month to control your lights and music. A Raspberry Pi + Home Assistant does this for $0/month and doesn't exfiltrate your home network topology to a third-party API. The value proposition only makes sense if your time is
worth more than your privacy.
The comparison to smart home gadgetry seems apt to me. I actually want to hack on something LLM agent-related to practice what is clearly a marketable skill, but I can't find anything I'd actually want it to do for me in my real life, other than maybe sort my emails for me, but there's no way I'm going to pipe every one of my emails to an LLM company.
I remember circa 2015 all my nerdy colleagues were going wild with home automation stuff, and I felt like I wanted to play with it too at first. But then I started to observe that these guys weren't spending less time than me turning on their lights. They were spending way more time than me, in fact, tinkering with their thermostats and curtains. I'm perfectly happy hitting a light switch when I walk in the door.
I can't envision one of these Telegram bots reliably completing tasks for me. Maybe the closest one would be what I've seen in this thread. Downloading torrents and putting them in Jellyfin for me, but really, I don't hate curating my own media collection.
> my nerdy colleagues were going wild with home automation stuff [...] I wanted to play with it too [...] these guys weren't spending less time than me turning on their lights
Yep. The IoT home automation stuff is still less performant than much older, wired solutions where whole systems were designed at once in a set-and-forget mode and didn't have weird sync issues or delays. I remember seeing the 'home of the future' exhibit at Epcot like 20+ years ago and these IoT setups are often still a total joke in comparison because of all the protocol issues and fiddling with various interfaces needed.
Just like how the analog wired POTS phone systems were more performant in many ways than pretty much any IP based voice setup.
I simply got tired of messing with stuff that kept breaking in unexpected ways. It wasn't saving time, it was adding a lot of totally unnecessary stress and actually taking time away from me-- for little more than an occasional spark of novelty. Being able to use voice accurately & repeatably for simple task requests is probably the only standout advancement.
My 'nerdy colleagues' and myself can get a lot of enjoyment out of tinkering with this new agentic hotness. However, very few of us I think are really getting something that's actually saving us time in the long run (at least in our personal lives), and it's going to take a while to figure out what's actually realistically reproducible toward that end at a reasonable cost.
IoT was an absolutely terrible fit for the home space. My parents have light switches in their house installed in the 1940s. They still work just as good. Getting something from the IoT of home automation to last like that is very difficult. Yet it seems to be the first model everyone reaches for when talking about it. If they had to replace the switches it would not cost too much to do either.
IoT really comes into its own space though when you pair it up with something that is a real pain to get to. Think somewhere you have to have a crainlift and a 4 hour drive just to touch the 20 year old computer something is hooked up to. Or basically anywhere that takes hours to get to. The space my company typically targeted was high rise air con companies. Or companies where the customer would service out any sort of PLC work to a 3rd party. At that point the savings of having to roll a guy out there vs looking on a computer has the thing pay for itself in 1-2 trips. Also the ability to show up on site with the correct parts. That alone was a huge savings.
IoT's big issues is you have to beat many things that are already dead simple to do.
I have Hermes agent run a cron each hour to check if the Steam Controller if finally on sale. I don’t if that resonates with you, I quite like that use case personally :)
Must be some ironic comment that I didn't get, but a simple script (curl calling steam API and sending a notification if the price is set) + cron handle the job perfectly.
EDIT: Giving the keys to an agent for such a trivial work is ... I got your sarcasm I think ^^.
This comparison is dishonest, and you know that it is. This is coming from someone that uses Home Assistant and wouldn’t touch OpenClaw with a 10 foot pole. If I had a horse in this race it’d be your horse, but to pretend that these achieve the same goals is just… not in the spirit of an actual discussion.
I have the voice assistant on Mike hooked up to Claude and it does most of the things I’d want OpenClaw to do.
I’m not generally interested in having it read my email or calendar. I have a digital calendar in the kitchen, and I rarely get important email. I do really enjoy being able to control my house by voice in natural language. I had it set all my lights to Easter colors a while back in a single instruction.
As someone who has openclaw and HA. HA can very much do alot of what I do in OpenClaw but would take more initial work but would be better in the long run.
Open source helped me more than cold outreach. Shipping something small and useful gave potential clients something concrete to evaluate instead of just a resume. The conversations that followed were much warmer.
The EU angle is interesting but the more immediate concern is the opt-in/opt-out framing. Google historically defaults these features to on and buries the toggle — did they actually make face data access opt-in from the start, or is this another "we'll notify you and assume consent" situation? The GDPR enforcement gap between announcement and actual compliance has been wide enough to drive a truck through.
The 2001 Fedkiw/Stam/Jensen "Visual Simulation of Smoke" paper added it back as a correction force for exactly this reason. At N=16 it doesn't matter much because the grid itself can't represent fine vortices, but the moment you crank N up the missing confinement becomes visible.
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