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LLP Multitouch Wall (3m x 2m)
Posted: 15 September 2008 08:03 PM   [ Ignore ]
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Hi everybody!

Like wSatori has posted in the chat, we’re currently building a 3 meter x 2 meter LLP based multitouch wall.

It’s a project for RBMA 2008(red bull music academy) that this year is currently being celebrated in Barcelona.

We would like to change the main view of multitouch from a table to a wall, opening possibilities to the interaction, like ball based interaction.

The project will evolve with red bull music academy event, offering different stages of interaction.

From multitouch-barcelona.com this is our first professional project and it takes a big effort for us, we hope you’d like it.

See the project:

Blog -> http://www.multitouch-barcelona.com
Vimeo -> http://www.vimeo.com/multitouchbcn/
Flickr -> http://www.flickr.com/photos/rxsurface
Youtube -> http://www.youtube.com/rxsurface

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Posted: 15 September 2008 08:29 PM   [ Ignore ]   [ # 1 ]
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Hey guys awesome work
i had a question, for a setup as big as yours were you getting false inputs when the lasers caught the underside of your palm.... i may have to draw you an image rasberry

also how are you guys ensuring that the plane is 1mm or less in thickness… cause these were the main problems i am and was facing on the project im working on.

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Posted: 16 September 2008 04:38 AM   [ Ignore ]   [ # 2 ]
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@ RogerMB , great job, guys !
did u modified that smoke demo app to get this speed ?

nice particules , also !

when it’s the deadline ?

@ Taha , you’re building an 11m*2m llp screen ?

Can you tell us both you in which wavelenght are you working ?

You rocks !

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Posted: 16 September 2008 09:14 AM   [ Ignore ]   [ # 3 ]
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Thanks Taha and Jimihertz!!!!

@Taha:

Currently we’re using 4 lasers, 1 for each corner of the screen, so you don’t have to worry about any kind of occlusion. When you put the hand over the screen it draws the contour of the hand, so it’s possible that detects false blobs, but you have had considered this in you’re software because there’s no solution about it. Respect the space between the screen and the laser line it’s a quite difficult to make it uniform to 1mm thick. Always you would have a nice approximation near the laser an a worse one on the other side of the screen, that is because a 1 degree variation near the laser become a big variation as the distance increase. For all of that it almost impossible 1mm uniform distance in all the screen.

@jimihertz:

We have configured our software how Alexp said in one of his posts, reaching 60fps in 640x480 resolution, you can also reach 120fps. We use FireflyMV.
About wavelenght we first tried with 850nm lasers and a 850+40 bandpass filter, but for the high price we finally used a 780nm lasers with his respective filter.
We could buy more laser with a lower price and a high range line generator.

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Posted: 16 September 2008 11:32 AM   [ Ignore ]   [ # 4 ]
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@ jimihertz
Im working with mainly 850nm 10mW lasers using a 70 degree line lens
Using 4 fireflymv s’ @ 60fps mono8 @640x480 resolution.

@rOger//MB
Yeah i know what you mean the hardest thing i’ve found is getting the lasers perfectly alligned parallel to the screen, we just got these brackets machined out and installed the lasers in them, they make a huge difference to ease of alligning the lasers.

Also i noticed that if you play around with the focus lens on the lasers it can really change the beam width, for my setup i’ve got the majority of them around 1~2mm thick just in the past few days.

I wanted to know if you’ve experience this problem… Say you put five fingers on the wall from one hand but your palm doenst touch the screen just the tips of your fingers touch the screen, Does the IR light reflected from your inputs get caught on your palm creating false inputs… (dunno if i explained it correctly)

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Posted: 16 September 2008 04:24 PM   [ Ignore ]   [ # 5 ]
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Taha - 16 September 2008 11:32 AM

we just got these brackets machined out last week and installed the lasers in them

Hey Taha, kan you place some photo’s /images of the laser mounting brackets? I’m looking for a good affordable way to maount/adjust the lasers.

Regards,

Tunabreath

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Posted: 16 September 2008 09:06 PM   [ Ignore ]   [ # 6 ]
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yeah sure
i wont be able to take them till this weekend
but no problem

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Posted: 17 September 2008 01:17 AM   [ Ignore ]   [ # 7 ]
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Taha - 16 September 2008 09:06 PM

yeah sure
i wont be able to take them till this weekend
but no problem

Thanks, no rush, but it would it would be of great help. Were they expensive?

Regards,

Tuna

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Posted: 17 September 2008 01:21 AM   [ Ignore ]   [ # 8 ]
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That wall looks great !!!! Did you also try other apps? Very smooth. Are you wearing the goggles for laser safety or just for the performance?

Regards,

Tunabreath

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Posted: 20 September 2008 06:29 PM   [ Ignore ]   [ # 9 ]
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Very cool guys! I love the big screen and the responsiveness of the application!
@ 2min 42sec in you video I swear an alien is using the screen!!! tongue wink hehe

Well done!

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Posted: 21 September 2008 12:46 AM   [ Ignore ]   [ # 10 ]
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Yes I’m wearing the glasses for laser safety.

Thansk tunabreath and fairlane!!

We will post some new videos and info soon!!!

Regards

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Posted: 24 September 2008 08:57 AM   [ Ignore ]   [ # 11 ]
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Tunabreath - 17 September 2008 01:17 AM

Taha - 16 September 2008 09:06 PM
yeah sure
i wont be able to take them till this weekend
but no problem

Thanks, no rush, but it would it would be of great help. Were they expensive?

Regards,

Tuna

Hey Tuna,

These are the holders that i were made for our setup… sorry about the picture quality but i guess you get the picture rasberry

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Posted: 24 September 2008 09:15 AM   [ Ignore ]   [ # 12 ]
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Thanks Taha,

The laser mounts look very good. Thanks for sharing.

I think it is one of the parts of peoples setup they do not post separate while it is very important to mount the lasers secure while stil able to finetune them.

Most people use modeling past, but i’m looking for a more structural setup that can also be transported. I had some inspiration last sunday and we made a simple 3 axis mount out of scews and metal corners/strips. I’ll put som pictures up next weekend.

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Posted: 24 September 2008 06:26 PM   [ Ignore ]   [ # 13 ]
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Hey!

I will post photos of our laser mount solution in a few days, they are very robust and sensible so you can calibrate the lasers extremely accurately (depth of the laser and 3 axes of freedom)

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Posted: 03 October 2008 07:30 AM   [ Ignore ]   [ # 14 ]
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@rOger//MB
can not wait to see your laser mount solution to be a reference, thanks for your sharing for the NUI communitiy!

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Posted: 10 October 2008 02:27 PM   [ Ignore ]   [ # 15 ]
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@ Taha ,

pliz send us some pics from Dubai !

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