Raspberry_Pi_Man
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Hologram Pi!!!

Mon Mar 04, 2013 4:34 pm

Hi,
I had a thought the other day about the raspberry pi and touch screens, and then a lightbulb moment came to me. In films and some TV shows they have really cool holograms and you can use your hands to control them. For example, in the big bang theory clip (http://www.youtube.com/watch?v=7ZPpZm59_P4) at 1:07, Leonard makes a hologram and controls it with his hands. I thought that I could use a LEAP motion to control the hologram with my hands, and somehow connect the hologram to hdmi out so that it can project the raspberry pi's screen in thin air. I am stuck on the hologram part as I can not find that many recourses out there, and I was wondering if you could do it without using a external monitor or a pane of glass. There were some examples of this at CES 2011 (http://www.youtube.com/watch?v=KfVS-npfVuY) . Any help would be greatly appreciated.

MadPixel
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Re: Hologram Pi!!!

Tue Mar 05, 2013 10:17 pm

Holograms aren't exactly able to be created by a consumer yet, as you need to be able to stop beams of light in thin air, which currently is impossible. Best I can suggest is if you are really smart, read into the optical illusion "peppers ghost"and experiment to see if I kinect-like system will allow you to control these projections.

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Tue Mar 12, 2013 6:50 pm

@MadPixel Thanks - I am going to try using the peppers ghost effect, and get my hands on a leap motion to plug into the raspberry pi! Thanks, any other suggestions are welcome, but i'm going to have a shot at this one!

toxibunny
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Re: Hologram Pi!!!

Tue Mar 12, 2013 7:34 pm

Stereoscopic 3d + head tracking + leap motion would get you the effect you are looking for, for one person - it could even be calibrated so you're actually 'touching' the thing, rather than just controlling it from afar. Add gloves with force-feedback and you could grab a simulated object and actually feel how hard/soft/springy/whatever it is. Extend this technique to cover your whole body. Replace your floor with tiny motorised bearings, and use multiple projectors to display the entire scene on the walls around you for a more immersive experience. Throw a kinect or two into the mix, and you could put simulated objects on top of real ones.

When you figure out how to put real objects on top of simulated ones, call starfleet - you've just invented the holodeck.

http://www.youtube.com/watch?v=3M8CNDYipUg
note: I may or may not know what I'm talking about...

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Sat Mar 23, 2013 12:47 pm

@toxibunny Have found this kinect 3d head tracking software (http://www.mutualmobile.com/posts/kinec ... nd-novelty) but do not know if I can work the code on the raspberry pi and get it working. But I'd prefer if you could look at the hologram without any 3d glasses and it being able to look at it almost like it was a real object, even though it's virtual. Any ideas? But will be happy to look into the idea of this anyway. Any ideas are welcome, thanks

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tzj
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Re: Hologram Pi!!!

Sat Mar 23, 2013 8:00 pm

The closest one company has got to holography for consumers is this...

http://en.wikipedia.org/wiki/Displair
http://displair.com/gallery/
http://www.themagpi.com <---- Checkout the MagPi
(The MagPi - Co-Founder)

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Wed Mar 27, 2013 8:30 am

@tzj Had a look at their website and wiki and it looks quite cool, but how could I be able to produce this hologram?
Any suggestions welcome


BTW. love magpi

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rurwin
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Re: Hologram Pi!!!

Wed Mar 27, 2013 9:48 am

Displair seems to be a thin plane of fog on which a screen is projected. Fog generators are available very cheaply from Maplin, etc., but getting a stable surface of fog with the right particle size and density would require loads of experimentation. It's only 2D.

There is a simple technology that gives you a real image hanging in mid-air. See http://hyperphysics.phy-astr.gsu.edu/hb ... ge.html#c1
Getting a 3D image from that is almost as hard as the original question, but not quite. If you can create a 3D image behind the lens, even with moving parts, then the image in front of the lens will be 3D and you can interact with it -- all the whizzing hardware is safely out of the way.

For example, put a translucent screen behind the lens and move it forward and back at 25Hz (two screens on a belt might be easier to build.) Now aim a projector at the screen and have it project slices of the image onto the screen as it moves through the space. There would be all sorts of problems: focus, brightness, update rate, viewing angle, etc. but it would work.

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tzj
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Re: Hologram Pi!!!

Wed Mar 27, 2013 3:00 pm

@rurwin i'd love to see a working example, plus the fun is in the tweaking :)
http://www.themagpi.com <---- Checkout the MagPi
(The MagPi - Co-Founder)

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Mon Apr 22, 2013 5:05 pm

Would be cool to see but would be just a bit complex...

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Sat May 04, 2013 7:46 pm

Maybe if you tried to make a 3d projector that doesn't use glasses or tried to replicate apple's 3d projector (http://www.raspberrypi.org/phpBB3/posti ... 64&t=35934) and use rurwin's suggestion, you could get a 3d no glasses hologram!

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mahjongg
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Re: Hologram Pi!!!

Sat May 04, 2013 8:04 pm

MadPixel wrote: as you need to be able to stop beams of light in thin air, which currently is impossible.
Some smoke or a piece of paper would "stop beams of light", but I get your drift.

But by the way, you mean "diffuse a beam of light in all directions", which is a different thing from stopping a beam of light.

Yes, I know I'm being pedantic, sorry... :roll:

Raspberry_Pi_Man
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Update

Thu May 29, 2014 1:46 pm

After spending a while researching into this, I have come up with some interesting points:

Hologram
I have been looking into 3D holograms, but have concluded that they are too complex and hard to create, so I opted for looking into a 2D hologram instead. I saw a few options for this, the first being the 'Make your own hologram' series by holocraft.net (holocraftvids on youtube). This technology is similar to Displair, and allows you to build a 2d hologram of any size by projecting visual media onto fog, which works quite well. The other option is the LEIA display system or LDS (http://www.leiadisplay.com/), which is essentially a more advanced version of the Holocraft hologram (and my preferable DIY option). Any tips on making a DIY version of the LDS would be much appreciated.

Leap Motion
Found this but not sure if any use - http://www.instructables.com/id/DIY-3D-Controller/

Any suggestions welcome. Thanks

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tzj
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Re: Hologram Pi!!!

Thu May 29, 2014 4:25 pm

Does the leia display have similar projection tech as the philips ultra short throw projector?
http://www.themagpi.com <---- Checkout the MagPi
(The MagPi - Co-Founder)

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Sat May 31, 2014 10:48 am

I believe so

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tzj
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Re: Hologram Pi!!!

Sat May 31, 2014 4:07 pm

Cool, now all i need is the fog.
http://www.themagpi.com <---- Checkout the MagPi
(The MagPi - Co-Founder)

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Tue Jun 03, 2014 7:39 am

@tzj Are you trying to build this too? Can you help me and share your plans on this forum if you are?

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tzj
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Re: Hologram Pi!!!

Tue Jun 03, 2014 3:19 pm

Yea, i'll keep you upto date on how i do.
http://www.themagpi.com <---- Checkout the MagPi
(The MagPi - Co-Founder)

jayaprakash
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Re: Hologram Pi!!!

Fri Aug 01, 2014 8:34 am

How can we create hologram display and projection in raspberry pi
:?:

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mahjongg
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Re: Hologram Pi!!!

Sat Aug 02, 2014 12:10 pm

You can't, a holographic projector (a'la R2D2 projecting princes leia) is not completely science fiction, but any real implementation is still several years ahead.
But there is indeed work being done on it:
http://spectrum.ieee.org/consumer-elect ... martphones

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Fri Dec 05, 2014 2:15 pm

Any updates on the project?

DUO 3D is a Leap Motion alternative, with apparent support for ARM. In theory, this should work with the Raspberry Pi. If we get a Mini Projector (or build one) which is short-throw, add a raspberry pi and a DUO-mini 3D and box it all up, we would have a Raspberry Pi Hologram with Touch input.

@tzj What were you thinking? Any successes?

I am already in progress building a prototype (two years on :roll: ), which should be ready by within the next few months after the DUO3D release. However, I may start a KickStarter campaign to fund the project and maybe even put together a kit for anyone to buy, so that they can make their own! I have created some noise about the project and I already have potential backers and interested third parties.

This is an Open Source project, so any suggestions would be great!

Thanks, Raspberry Pi Man

Raspberry_Pi_Man
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Re: Hologram Pi!!!

Fri Dec 05, 2014 2:16 pm

Just so you know, there is a expected DUO3D release at the end of this month (Dec 2014)

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tzj
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Re: Hologram Pi!!!

Fri Dec 05, 2014 2:41 pm

I haven't really made any progress at all, plus the projector had to go back :/

This may help... http://www.iflscience.com/technology/ul ... n-and-felt
It could make a good 3d upgrade.

Even if it has been 2 years you still deserve the praise for getting ahead! :)

If it doesn't blow-the-bank then I'd be happy to help test it.
http://www.themagpi.com <---- Checkout the MagPi
(The MagPi - Co-Founder)

carolinalou
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Re: Hologram Pi!!!

Mon Feb 02, 2015 2:09 am

Sorry, but that's impossible. A hologram is created using a very specific technique involving the interference of light waves from a laser to reconstruct an image on a 2D surface in a way that appears to be 3D . The image never really leaves the surface.This display has advantages over other 3D displays. It is an impressive and innovative method now a days.

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