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James Brown

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.

A picture of a transparent plastic sphere (the dome for an outdoor lamp), nestled in its packaging.
20 comments
James Brown replied to James

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.

A picture of the current 3D display. A bare chassis supports a blurred spinning led panel. On the base is a small circular lcd displaying a polar plot of acceleration - a blobby red lobed shape, a blue circle, and a green line pointing in the blobbiest, lobiest direction.
James Brown replied to James

2D video of 3D projection of 4D object.

James Brown replied to James

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.

A transparent plastic dome with a Dremel mounted to it in a 3D printed jig.
James Brown replied to James

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.

A photo of a truncated dome sitting on a bench. Behind it is the chassis of the volumetric display that it will eventually be mounted on.
James Brown replied to James

25 fps. That's an actual frame rate.

James Brown replied to James

Taking it all apart so I can film myself making it.

The core of my volumetric display - a black half-cylinder containing a Pi and associated electronics, some carbon fibre rods, and a ludicrously oversized bearing.
James Brown replied to James

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.

A clip-in power socket sitting slightly out of its housing.
James Brown replied to James

Easier to see the 3D when it's only the camera that's moving.

James Brown replied to James

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.

A volumetric display sitting on a desk. A plastic bubble contains the floating image of a Smart Car. It’s supported by a green plastic stand with a single dial on the front reading “30”.
James Brown replied to James

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.

James Brown replied to James

What this thing needed was another source of barely recognisable low res flickery points of light.

James Brown replied to James

I built a contraption for my camera

James Brown replied to James

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)

James Brown replied to James

Everyone needs to build one of these displays so I can spend my time writing games for it.

A kind of low poly kind of spaceship hovers above an undulating landscape of green and brown tiles, all rendered in points of light inside the bubble of a volumetric display. The scene looks a little bit like the Lander demo that came with the Acorn Archimedes, which is a shame because it’s supposed to look *exactly* like that.
James Brown replied to James

Amazing what these Arm processors can do.

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