James Brown

In New Zealand, making things.

PeerTube: https://makertube.net/c/ancient/videos
YouTube: https://www.youtube.com/@ancientjames
email: [email protected]

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Last Notes

2026-02-07 17:32:23 GMT

"Animated Bokeh" has been on my whiteboard for a long time, and this is the result.
I thought it would just be for cheesy novelty effects, but it also does lightfield manipulation that was cooler than I expected.
https://www.youtube.com/watch?v=Kg_2MAgS_pE

2025-11-19 21:13:08 GMT

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It's fun discovering what sort of content works best on these displays. With the spinning LEDs it was wireframe spaceships. This thing is all about museum quality loot.
https://files.mastodon.social/media_attachments/files/115/578/408/517/274/306/original/f3767ccea38a8f04.mp4

2025-11-15 01:09:26 GMT

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Incidentally, the viewport version of that animation doesn't work - the points only line up when refraction is taken into account.
I've used the equation for refraction countless times in shaders, but somehow it kind of blows my mind that it actually works IRL.

2025-11-15 00:58:27 GMT

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I rendered off an animation showing how the points are aligned when seen from exactly the right spot.
https://files.mastodon.social/media_attachments/files/115/550/984/218/019/476/original/27f28787be3e468e.mp4

2025-11-14 06:30:30 GMT

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I learned my lesson from the previous displays, and this time wrote the simulator before writing the actual driver code.
It allowed me to quickly catch a flipped axis which I can believe would have otherwise taken me days to figure out.
https://files.mastodon.social/media_attachments/files/115/546/620/036/566/623/original/95715ceb2fb325e2.png

2025-11-14 03:04:26 GMT

Latest voxels!
Flickery when filmed ✓
Distracting reflections ✓
You kind of have to be there ✓
https://files.mastodon.social/media_attachments/files/115/545/807/621/787/586/original/3571f4af27865643.mp4

2025-09-17 06:26:57 GMT

I lost all my pre-2013 photos in a hard drive failure some years ago (irreplaceable baby pics etc), and chalked it up as a lesson to always make backups. But I just spent three days clearing out the garage for some work to be done, and it turns out the *actual* lesson is to always remember that you did make a backup you idiot, it's in the garage under a pile of crap.

2025-08-01 02:31:31 GMT

I think I'm ready to call this piece finished.
https://files.mastodon.social/media_attachments/files/114/951/127/445/682/264/original/f383ed207a39a178.mp4

2025-07-24 03:20:20 GMT

I made a new mouth mechanism. I'm calling it Selectramatronics.
https://files.mastodon.social/media_attachments/files/114/906/028/937/903/458/original/a7d2a3f56c308404.mp4

2025-07-14 22:33:58 GMT

I have this little jog/shuttle dial which would be great but for one flaw - the jog wheel doesn't generate an event for the first click when it changes direction. If you go 3 clicks forward then 3 clicks back, it outputs 3 forwards and 2 back. It doesn't end up back where it started.
I popped it open to see what's going on, and the encoder is behaving sensibly - it seems to just be a firmware issue. So do I try to reflash that MCU, chisel it off and cram a Pico in there, or make a whole new PCB?
https://files.mastodon.social/media_attachments/files/114/853/858/475/571/559/original/1cc472546304a7ac.jpeg

2025-06-18 04:37:31 GMT

I unsubscribed from a podcast because the hosts were a bit dull and frankly sounded drunk. I was some way through listening to an interview with someone I usually like and thinking, this guy sounds drunk and a bit dull, when I realised the playback speed was still set to 75% from watching an XKCD video earlier.

2025-05-30 01:56:34 GMT

I clambered down onto the rocks to get a better look at this eel, and it heaved itself up onto them to get a better look at me.
https://files.mastodon.social/media_attachments/files/114/594/279/771/855/589/original/dde46a634ab6c61a.jpeg

2025-05-25 06:19:05 GMT

I wrote a program to lipsync the shipping forecast in a terminal window, and I have no regrets.
https://files.mastodon.social/media_attachments/files/114/567/013/238/793/634/original/7982558e55e6c73f.mp4

2025-05-06 03:33:38 GMT

Very grateful to past me for open sourcing one of my projects, because I just needed to build a new version and it would have been a real pain to work out how to do that again from scratch.

2025-04-25 00:01:20 GMT

My superpower is getting out of sync with the record button on my camera, and ending up with lots of footage of me faffing around and muttering to myself, cutting out as soon as something interesting is about to happen.

2025-04-20 09:13:53 GMT

I plugged this in for a soak test a week ago and forgot about it, so I guess it's soaked.
The UI is randomly generated, and I love what it came up with here.
https://files.mastodon.social/media_attachments/files/114/369/518/155/902/931/original/14cea3e9084a2486.mp4

2025-02-28 02:50:51 GMT

https://files.mastodon.social/media_attachments/files/114/079/232/028/120/698/original/2ba6c09902143041.png

2025-02-27 06:56:58 GMT

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There's now a making-of video for this display. https://www.youtube.com/watch?v=zz59e1wWyVc

2025-02-27 03:18:36 GMT

I have Kiwix and an offline copy of wikipedia on my phone, and my local Gen Z was so surprised and excited by the concept that I thought we should have a dedicated thing for it. Cheap e-reader plus 128GB SD card plus no wifi.
https://files.mastodon.social/media_attachments/files/114/073/666/645/790/741/original/28598d5152b83d35.jpeg

2025-02-21 08:00:38 GMT

One problem with a 360° display is that sometimes you want the content to align with the controller.
This nifty hack uses the fact that everything is spinning, including the bluetooth antenna. It creates a map of the signal strength to any connected controllers and points to where it's strongest.
https://files.mastodon.social/media_attachments/files/114/040/794/468/347/429/original/f3b67df407e716d6.mp4

2025-01-21 03:53:49 GMT

Seems you can’t do a picture and a poll at the same time. But does this battery look spicy to you?
https://files.mastodon.social/media_attachments/files/113/864/300/949/746/878/original/802b380c7ca259bd.jpeg

2024-12-23 04:07:31 GMT

Exclusive behind the scenes footage of my high end motion control system.
https://files.mastodon.social/media_attachments/files/113/700/129/988/948/201/original/108cba6b32400aaf.mp4

2024-12-20 02:21:12 GMT

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Now with explosions https://www.youtube.com/watch?v=ILNbnWneTIg

2024-12-16 08:10:00 GMT

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Amazing what these Arm processors can do.
https://files.mastodon.social/media_attachments/files/113/661/475/754/890/513/original/519f3186e4dcb3bf.mp4

2024-12-15 09:41:09 GMT

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Everyone needs to build one of these displays so I can spend my time writing games for it.
https://files.mastodon.social/media_attachments/files/113/656/162/438/500/782/original/25c895c02fe29b5d.jpeg

2024-12-10 22:38:53 GMT

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I tried the thumbnail testing feature on Youtube for the first time, which was fun. Upload 3 different images, and it randomly applies them and shows you which one was the most engaging. This was the winner.
(I didn't include one with my surprised face and an overlaid arrow pointing at something)
https://files.mastodon.social/media_attachments/files/113/630/913/870/217/267/original/147d95c1771cef9c.jpg

2024-12-09 18:31:25 GMT

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Construction video for this display… https://youtu.be/pcAEqbYwixU

2024-12-04 21:14:37 GMT

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I built a contraption for my camera
https://files.mastodon.social/media_attachments/files/113/596/614/395/921/926/original/c85d033ecabb7d22.mp4

2024-11-27 04:46:04 GMT

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You look like a good Joe
https://files.mastodon.social/media_attachments/files/113/553/095/388/369/768/original/85eb8759cedcf581.jpeg

2024-11-24 04:46:06 GMT

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What this thing needed was another source of barely recognisable low res flickery points of light.
https://files.mastodon.social/media_attachments/files/113/536/088/394/963/070/original/995151de33299b8d.mp4

2024-11-22 22:42:24 GMT

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https://www.youtube.com/watch?v=ydk3BhlUWYE I've been working more on capturing footage. Hand held camera movement is still a mess, but putting the content into rotisserie mode helps sell the 3D with a static camera.

2024-11-20 19:39:30 GMT

Happy birthday to Olive, 20 years old today.
https://files.mastodon.social/media_attachments/files/113/516/966/331/637/510/original/4dcd34a5ae0c4940.jpeg

2024-11-14 04:09:16 GMT

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Yet another round of finding new places to hang counterweights, and I’ve hit 900rpm - 30fps. Amazing to scroll back to the start of this thread and see me wonder if I could get some sort of rudimentary depth effect going.
https://files.mastodon.social/media_attachments/files/113/479/313/632/517/613/original/a14e1742baabcc03.jpeg

2024-11-01 07:01:58 GMT

Go spudsters
https://files.mastodon.social/media_attachments/files/113/406/405/007/188/607/original/d36543811415a6f7.jpeg

2024-10-28 05:16:20 GMT

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Meme crustacean
https://files.mastodon.social/media_attachments/files/113/383/334/257/424/562/original/bef918b07a20fe2f.jpeg

2024-10-26 06:53:14 GMT

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Easier to see the 3D when it's only the camera that's moving.
https://files.mastodon.social/media_attachments/files/113/372/388/757/167/633/original/76741cde0e089922.mp4

2024-10-19 00:54:14 GMT

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Now thinking I should have filmed the tool I made to press all the clips on this IEC socket so I could get it out of the housing in order to film the satisfying click it makes when it goes in.
https://files.mastodon.social/media_attachments/files/113/331/343/811/569/375/original/46ae188daa3e98d1.jpeg

2024-10-19 00:33:02 GMT

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Taking it all apart so I can film myself making it.
https://files.mastodon.social/media_attachments/files/113/331/262/406/623/450/original/85fd38b99ff0afbf.jpeg

2024-10-11 23:15:44 GMT

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25 fps. That's an actual frame rate.
https://files.mastodon.social/media_attachments/files/113/291/315/516/387/891/original/75912a836a5e834b.mp4

2024-09-27 22:09:25 GMT

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Enbubbled.
https://files.mastodon.social/media_attachments/files/113/211/779/387/918/626/original/bcb545d7e340f575.jpeg

2024-09-21 02:00:21 GMT

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With the previous dome the cut had a somewhat hand made look to it, so I printed a thin piece of trim to slip over the edge and keep it neat. It was too big for the printer so I used TPU, printing it in a spiral and flexing it back in to the right diameter. An unexpected benefit was that it was way quieter with that isolating the dome from the base.
This time the cut went better, but I’m still going to give it a gasket for that reason.
https://files.mastodon.social/media_attachments/files/113/173/026/852/096/863/original/d81316794d43471a.jpeg

2024-09-20 23:56:24 GMT

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There’s a fair bit of planning involved in finding the true centre and height of these domes. When I come to make the cut it feels like cleaving the Cullinan diamond.
https://files.mastodon.social/media_attachments/files/113/172/565/019/554/470/original/479451d967df8452.jpeg

2024-09-17 08:45:14 GMT

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Original voxels
https://files.mastodon.social/media_attachments/files/113/152/006/281/643/069/original/b0aa4fc2d178512d.jpeg

2024-09-15 04:04:38 GMT

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2D video of 3D projection of 4D object.
https://files.mastodon.social/media_attachments/files/113/139/573/163/821/160/original/ac6346995ef36d0a.mp4

2024-09-14 05:22:19 GMT

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There’s now an accelerometer in the base, synced to the rotation of the screen. I’m hoping this will help me get it balanced better. I don’t entirely understand the shape it’s producing, but the line is pointing in roughly the direction I think it should be pointing.
https://files.mastodon.social/media_attachments/files/113/134/202/264/009/398/original/6e4a237cc344658e.jpeg

2024-09-08 22:22:56 GMT

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New dome!
There are many advantages to moving to smaller panels in the new design (momentum etc), but the price drop going to a 300mm dome from 400mm would be justification enough.
https://files.mastodon.social/media_attachments/files/113/104/252/719/485/768/original/35d7d2c5ace78c12.jpeg

2024-09-07 00:09:57 GMT

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So many complaints about the framerate on that last video, so I decided to upload one with a shorter exposure and more flicker. But I still ended up keeping it below 30 fps, so I suspect the complaints will be about both framerate and flicker. Just have to hope the algorithm doesn’t go so large on this one. https://youtu.be/gBfclb9hXCI

2024-09-05 08:43:18 GMT

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Oh I meant more in the sense of "I should get off my arse and do it". I'm familiar enough with the mechanics of it.

2024-09-05 05:26:28 GMT

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I’d like an archive of the gadgets I’ve made over the years; pictures, videos, descriptions sort of thing.

2024-09-04 22:46:29 GMT

I really need to make a website.

2024-09-01 00:19:35 GMT

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In motion https://youtu.be/na7pvihXhYs

2024-08-30 23:12:25 GMT

This is not a good VR camera.
https://files.mastodon.social/media_attachments/files/113/053/497/207/847/670/original/74becc4220835ddf.jpeg

2024-08-30 08:13:24 GMT

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These guys.
https://files.mastodon.social/media_attachments/files/113/049/954/532/838/417/original/0dfe32749d756e61.jpeg

2024-08-30 00:52:52 GMT

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Dynamic balancing using a tray of marbles and iPhone slowmo.
https://files.mastodon.social/media_attachments/files/113/048/219/443/342/396/original/51a8680ebf72172d.mp4

2024-08-26 09:11:58 GMT

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First test of the new design, and already I’m happy. Quiet, high refresh rate, and doesn’t feel like it’s seconds away from embedding itself in my face.
https://files.mastodon.social/media_attachments/files/113/027/517/855/598/461/original/4cb3132d3e260c59.jpeg

2024-07-14 05:30:45 GMT

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Maybe it would be useful in a high radiation environment idk
https://files.mastodon.social/media_attachments/files/112/783/184/550/208/019/original/79efb3617f6587d6.mp4

2024-07-12 09:01:29 GMT

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Why did I do this?
https://files.mastodon.social/media_attachments/files/112/772/689/495/005/639/original/cb861105f88dd740.mp4

2024-07-06 07:22:47 GMT

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I encapsulated the ends without breaking too many. Now I just need to pixel map them.
https://files.mastodon.social/media_attachments/files/112/738/320/016/285/915/original/8d3628884d50a150.mp4

2024-07-06 07:16:30 GMT

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Nothing like Kapton tape to make you feel like you're doing Technology.
https://files.mastodon.social/media_attachments/files/112/738/299/842/847/868/original/2dd575edf0d8bc57.jpeg

2024-06-30 06:16:38 GMT

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I’ll have to rethread it and put the 14 extra around the edge.
https://files.mastodon.social/media_attachments/files/112/704/097/681/335/816/original/8a9051d5cfdfe69d.png

2024-06-30 06:08:36 GMT

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I guessed 512 or under, annoyingly.

2024-06-30 06:07:47 GMT

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526. There are 526 individual strands.
https://files.mastodon.social/media_attachments/files/112/704/068/980/590/814/original/0f3ffd35a1c91ee0.png

2024-06-30 06:06:40 GMT

Have you ever wondered how many strands are in one of these tat shop fibre optic wands?
https://files.mastodon.social/media_attachments/files/112/704/064/217/461/949/original/cb2412fccd48be49.png

2024-06-11 08:31:05 GMT

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In practice it's complicated by the fact that these panels update two lines at once. Every time you update a column in the outer half, you're also updating one in the inner half. I couldn't find a simple procedural update strategy to spread these evenly, so I ended up generating a lookup table for it using simulated annealing.
https://files.mastodon.social/media_attachments/files/112/597/051/226/687/731/original/6aef7797bceea16f.mp4

2024-06-11 08:30:39 GMT

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The real improvement comes when you adjust the update rate for each column to match the length of the track they have to sweep out. Instead of wrapping around when you reach the last column, you wrap around when your counter reaches the square of the number of columns, and you update the column corresponding to the integer square root of the counter. This gets rid of the bright dense region in the middle, and adds more updates out at the edges making them less sparse.
https://files.mastodon.social/media_attachments/files/112/597/049/663/316/828/original/e81c34207e42a6cd.mp4

2024-06-11 08:30:12 GMT

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If you turn the panels 90 degrees so their scan lines are now columns, you can do a bit better. The update doesn't have to be sequential - instead of stepping one column at a time, you can skip a few each time. As long as you pick a number which is coprime with the number of columns, and you wrap around once you go past the last one, you'll still visit each of them but spread out more evenly throughout the volume.
https://files.mastodon.social/media_attachments/files/112/597/047/803/433/086/original/5b53795c9554aec1.mp4

2024-06-11 08:29:40 GMT

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This display works by spinning a matrix display rapidly about a vertical axis, lighting up each LED as it passes through part of a 3D image. The way you update the displays has a big impact on the quality of the image.
In this gif, each dot represents a column of LEDs - we're looking at the device from above. Here the panel is treated like a 2D display which just happens to be moving. Each scan line is repeatedly visited in turn, sweeping out a set of slices where the image can be displayed.
https://files.mastodon.social/media_attachments/files/112/597/044/879/817/575/original/72c6600cdb432961.mp4

2024-04-27 08:40:12 GMT

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Doom running at a larger scale. Easier to make out what's going on, harder to see what's shooting at you.
https://youtu.be/bRe1OSkeiQg

2024-04-27 07:24:48 GMT

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I do like an ample window and natural light, but it makes it hard to see the leds. Hence this pirate astronaut.
https://files.mastodon.social/media_attachments/files/112/341/979/432/786/343/original/158804692a17cbca.png

2024-04-27 06:50:27 GMT

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Monsters.
https://youtu.be/yIfgjr-B8xI

2024-04-21 08:37:23 GMT

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kind of feels like it needs monsters?
https://files.mastodon.social/media_attachments/files/112/308/285/561/974/208/original/fe0a333efe582e24.mp4

2024-04-01 05:05:59 GMT

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I’m now suspicious of all the PLA parts. The little pit with the Pi in it is getting very warm.
https://files.mastodon.social/media_attachments/files/112/194/211/673/706/849/original/5c066381277b65d7.png

2024-03-31 06:59:45 GMT

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This feels like a good match of style and content.
https://files.mastodon.social/media_attachments/files/112/188/991/153/039/731/original/16f2864364f3e147.mp4

2024-03-31 02:57:49 GMT

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I continue to fail to shoot footage of it that does it justice.
https://files.mastodon.social/media_attachments/files/112/188/028/922/063/519/original/ed79c2d69b3ab6f1.mp4

2024-03-31 02:39:26 GMT

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Pi 4 model A
https://files.mastodon.social/media_attachments/files/112/187/974/199/884/642/original/e90068b1371e0487.png

2024-03-31 02:07:27 GMT

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That's the mount for the slip ring. A cylinder carrying a couple of copper bands fits over the pillar, and an M4 bolt goes own the middle to hold it all together. It has very clearly become bent, and without any signs of cracking. Presumably, as it spins, it heats up enough to soften the PLA, and the spring loaded brushes push it out of alignment.
I've reprinted it in ABS; going to see how well that lasts.

2024-03-31 02:03:34 GMT

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It feels as though I'm endlessly rebuilding it, for diminishing improvements. But in the most recent rebuild I finally solved a mystery that has been bugging me. When the display had been running for a while, it would quite abruptly lose balance and start vibrating. After the last occurrence, it was never quite the same. On stripping it down I found this.
https://files.mastodon.social/media_attachments/files/112/187/836/096/255/613/original/5a9a5e1e6667f8ad.jpeg

2024-03-31 01:57:02 GMT

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In the continuing quest for higher rpm, I've moved the controller down below the screen and across the axis of rotation. It's a lot harder to get at if I need to rewire anything, but it does improve the balance.
https://files.mastodon.social/media_attachments/files/112/187/777/308/363/275/original/6076766fdbf35c9a.jpeg

2024-02-18 07:48:00 GMT

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I mean, you should have seen it before.
https://files.mastodon.social/media_attachments/files/111/951/369/941/791/430/original/dbf37d3ef3e27834.jpeg

2024-02-18 07:38:28 GMT

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I rewired the back of the panel to tidy up all the loose flappy cables. It now manages 600 rpm, which is not too flickery.
https://files.mastodon.social/media_attachments/files/111/951/325/060/852/583/original/f45c98672deb6400.mp4

2024-02-18 01:46:33 GMT

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yes, and frosted privacy films. What I really want is a coating that will form little beads on each LED.

2024-02-17 01:25:44 GMT

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They really need to be diffused at the point where they're emitted, which would also help a little with the dimming along the direction of view. I haven't yet come up with a good approach for that.

2024-02-16 07:21:53 GMT

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There must be at least 6D here.
https://files.mastodon.social/media_attachments/files/111/939/935/499/654/530/original/7628c03aa0bda8a8.mp4

2024-02-16 04:19:45 GMT

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Guess I’m doing a cone next.
https://files.mastodon.social/media_attachments/files/111/939/229/106/645/149/original/89b237111e767442.jpeg

2024-02-16 02:38:41 GMT

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Shiny! (Maybe too shiny. )
https://files.mastodon.social/media_attachments/files/111/938/827/603/071/186/original/3fb097238565849d.jpeg

2024-01-22 04:37:09 GMT

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It's a nice fluid motion on the panel, but overall it doesn't bring me joy.
https://files.mastodon.social/media_attachments/files/111/797/701/655/801/280/original/9ec4d353b1aac188.mp4

2024-01-22 04:15:08 GMT

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I had a panel left over, and I thought I should have another stab at an oscillating display. I wanted to give it an undulating motion and came up with what seemed like a nice linkage, but the end result looks like it was designed by Trevithick.

2024-01-22 04:10:28 GMT

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Latest flickery mess
https://files.mastodon.social/media_attachments/files/111/797/630/429/294/414/original/0b4fbf02b04f1b9d.mp4

2024-01-05 05:54:44 GMT

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Incidentally, those models are from Cheello's voxel Doom: https://www.moddb.com/mods/doom-voxel-project/addons/voxel-doom - It's a lovely mod, and makes Doom feel more like my memories of playing it than the real thing does.

2024-01-05 05:50:40 GMT

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The other problem I have is that to sell the 3D effect I need to move the camera around a lot, so I'm going to have to put some effort into building a studio backdrop.

2024-01-05 05:48:13 GMT

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Slightly higher rpm, slightly longer shutter.
https://files.mastodon.social/media_attachments/files/111/701/760/371/007/315/original/6c4fe53504d1652a.mp4

2024-01-05 04:46:16 GMT

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My target for this display is 600 rpm - lower than that and it's too flickery; higher than that and I can't refresh fast enough to get 400 voxels around the circumference without dropping to 1 bpc. I'm nudging 400 rpm here, and it's still pretty unfilmable and absolutely terrifying to be close to. I have to decide whether the overall approach is worthwhile enough to start spending money on aluminium and polycarbonate.
https://files.mastodon.social/media_attachments/files/111/701/491/531/794/920/original/9777cafabfec8cbf.mp4

2024-01-02 04:44:20 GMT

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I've implemented parts of a content pipeline for rendering a scene on the PC and streaming it to this display, but writing video streaming code is so much less fun than playing with voxels that it may take a while to finish.
Here, I've stored the animation uncompressed on the display itself, and am updating it as fast as the Pi's SD card can handle. (Not very fast.)
https://files.mastodon.social/media_attachments/files/111/684/468/167/814/968/original/60601251f161c595.mp4

2023-12-30 03:44:58 GMT

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I am having so much fun with this thing.
https://files.mastodon.social/media_attachments/files/111/667/300/383/697/991/original/0687086ee31cf0d3.jpeg

2023-12-29 06:47:35 GMT

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Help me Obi-Wan Clownobi
https://files.mastodon.social/media_attachments/files/111/662/354/204/446/959/original/701a12fb66683a5b.mp4

2023-12-29 00:01:49 GMT

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I really need to get a hobby where missing my framerate target doesn't make me physically nauseous.

2023-12-28 07:39:40 GMT

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Trademark flickery mess
https://files.mastodon.social/media_attachments/files/111/656/899/875/012/068/original/66a0dfc475b43694.mp4

2023-12-27 23:17:23 GMT

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It would be convenient to address the voxel data as a stack of horizontal slices, because that's how it's exported from lots of existing tools. I have to rotate it 90 degrees though, because scanning out is faster if each column's data can be addressed as consecutive bytes.
It's a small change, but there's a 6.5x difference in speed between the two orientations, which directly translates into voxel density in the final output.

2023-12-27 01:51:48 GMT

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Slowly turning up the dial at arm’s length.
https://files.mastodon.social/media_attachments/files/111/649/854/179/760/166/original/b03cebc377eafa62.jpeg

2023-12-22 06:36:06 GMT

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I massively overestimated how much lead would be needed to counterbalance the small amount of slightly off-axis electronics.