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Bubble Displays Are Increasing In Resolution

PipeDreams 3 bubble display

[Bruce] has created a pretty cool bubble display that is capable of showing recognizable photographs of people. This entire art installation is no slouch at 3-stories tall! This one resides at the Ontario Science Centre in Toronto, Canada. If you are unfamiliar with bubble displays, they consist of several clear vertical tubes filled with a liquid. A pneumatic solenoid valve mounted at the bottom of each tube allows a controlled amount of air to enter the tube at a very specific time. Since the air weighs less than the liquid, the air bubble travels up the tube of liquid. Interesting patterns can be made if these bubbles are timed correctly. This setup uses a Linux-based computer with custom control software to manipulate the valves.

[Bruce] didn’t start off making super-complex bubble displays. This is actually his 3rd go-around and with 96 individual tubes and capable of displaying raster images, it is the most complicated so far. His first creation consisted of 16 tubes, each larger in diameter than the most recent creation. With the larger diameter and less number of tubes came less resolution and the ability to only display simple shapes. Version 2 had twice as many tubes, 32 this time. In addition to doubling the tube quantity [Bruce] also colored the fluid in the tubes, not all the same color but all the colors of the rainbow, from red to violet. Still, this version could not show raster images. It appears to us that the third time’s the charm! Video after the break….

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View-Master Video Player!

view master 3d video player

[Alec] just sent us this great project he’s been working on. Converting an antique View-Master from the early 50’s into a modern 3D video player, capable of reading Mini-CDs.

Most View-Masters don’t have much space for tinkering, let alone adding a Raspberry Pi, two displays and a CD drive, so [Alec] really lucked out when he found this model — complete with light and D-cell battery pack. Tons of space! He originally looked into getting some cheap digital photo frame LCDs from China, but soon realized the effort involved with making those work just wouldn’t be worth it, so instead he picked up some 0.9″ OLED displays from Adafruit. He still forgot to check if they had drivers for the Raspberry Pi though, and ended up on another detour of modifying FBTFT drivers to make it all work.

After that headache he got to the fun part — cramming all the hardware inside. He picked up a cheap laptop CD drive off of eBay, and discovered that using the 80MM Mini-CD standard, the discs would just fit inside of the View-Master, sticking out just a little bit, kind of like the original photo wheels!

Quite a bit of fiddling later, he managed to assemble the entire thing in layers, without damaging the external shell of the View-Master. Since it is an antique, it was important for him that his hack be reversible — and for the most part, it is! Stick around after the break to see a short video explanation!

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Volumetric display projects 200 Million voxels per second

Over the last four years, [Will] and [Gav] have spent their time creating a huge, high-resolution 3D display. The’re just about done with their build, so they decided to offer it up to the Internet in the hopes of people creating new 3D content for their display. They call their project the HoloDome, and it’s the highest resolution volumetric display we’ve ever seen.

The HoloDome operates by spinning a translucent helix around its vertical axis at 20 rotations per second. A pico projector above the helix capable of projecting 1440 frames per second (an amazing device by itself) displays 72 ‘z-axis’ frames for each of the 60 ‘x and y frames’ per second. The result is a 3D display with a 480 * 320 * 72 voxel resolution capable of displaying 20 frames per second.

This isn’t the first time we’ve seen a swept helix used as a volumetric display, but it is by far the highest resolution display of its type in recent memory. [Gav] and [Will] have put their HoloDome up on the Australian crowd-funded site Pozible if you’d like to buy your own, but thankfully the guys have included enough detail on the main site to reconstruct this project.

Check out the video after the break to see the HoloDome in action.

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More Kinect holograms from [programming4fun]

[programing4fun] has been playing around with his Kinect-based 3D display and building a holographic WALL-E controllable with a Windows phone. It’s a ‘kid safe’ version of his Terminator personal assistant that has voice control and support for 3d anaglyph and shutter glasses.

When we saw [programming4fun]‘s Kinect hologram setup last summer we were blown away. By tracking a user’s head with a Kinect, [programming] was able to display a 3D image using only a projector. This build was adapted into a 3D multitouch table and real life portals, so we’re glad to see [programming4fun] refining his code and coming up with some really neat builds.

In addition to robotic avatars catering to your every wish, [programming4fun] also put together a rudimentary helicopter flight simulator controlled by tilting cell phone. It’s the same DirectX 9 heli from [programming]‘s original build. with the addition of Desert Strike-esque top-down graphics. This might be the future of gaming here, so we’ll keep our eyes out for similar head-tracking 3D builds.

As always, videos after the break.

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A real, laser-based 3D display

3D display technology is fairly limited. Most 3D displays out there rely on either prisms refracting light from a normal flat-panel display, or shooting lasers into some sort of space-filling device. A few researchers in Japan went with a more unconventional method of making a 3D display that actually lives up to the promises of the displays seen in Star Wars.

From the coverage of this display we’ve found, the green laser demonstration is a scaled-down version that uses water as the display medium. There’s a short clip that shows a red, green, and blue laser projecting a few white voxels into mid-air. The video of both these demonstrations is a bit jumpy, but that’s probably because of the difference in frame rate between the display and camera.

We’re not really sure how the “plasma excitations of air molecules with focused beams” actually work, or even how to control 50,000 of these dots at 15 frames per second. If you’ve got any idea how to build one of these guys, leave a note in the comments.

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