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Building Overkill Multi Touch
Posted: 05 September 2008 04:29 PM   [ Ignore ]   [ # 31 ]
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Thanks lolec.  I’m on the phone with them right now, Spoke with Dimitry(Sales) and Thomas(Computer Engineer).  I explained what I was going for and they recommended that I stay with servers due to memory size.  Their systems currently cap at 128gig of memory.  Thomas suggested to go with the dell rack server setup (better overall).

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Posted: 05 September 2008 04:39 PM   [ Ignore ]   [ # 32 ]
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Good that’s good to know.  Keep on posting all details about this project, would be cool to have as reference sometime.

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Posted: 05 September 2008 04:51 PM   [ Ignore ]   [ # 33 ]
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I’ve been thinking and I was just wondering on how far away from your server rack you wanted to place your multi-touch tables because if you are running them all from one location you will have to deal with the limiting distances that the cables will carry signal, and then you might have to deal with signal boosters if you want to take it farther. I know that HDMI is maxed out at like 200 absolute max I think. I don’t know how Firewire will take you (for the Firefly webcam) or USB for the EyeToy. Your biggest issue would be display though.

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Posted: 05 September 2008 05:56 PM   [ Ignore ]   [ # 34 ]
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It’s 3:33pm and I’ve just placed the order with Dell.  In regards to the distance problem I’m going to use the Matrox Extio F1220 for each MT station.  I’ve been using them since early 2007.  Thought most of the people here knew about the product.  The main will be directly connected to the server.

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Posted: 05 September 2008 07:41 PM   [ Ignore ]   [ # 35 ]
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Can anyone give me data regarding the dragonfly express?  Can you remove the IR filter or not?

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Posted: 05 September 2008 08:58 PM   [ Ignore ]   [ # 36 ]
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Yeah you can remove the IR filter. You can PM if want want more details about it.

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Brett Forsyth
Blog: http://blog.thestem.ca
My Mult-touch build: http://ddblog.vfs.com/category/multi-touch/
Where I teach: http://vfs.com/fulltime.php?id=13

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Posted: 05 September 2008 09:19 PM   [ Ignore ]   [ # 37 ]
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Will do.  I’ll order it then.  Thanks.

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Posted: 06 September 2008 01:43 PM   [ Ignore ]   [ # 38 ]
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Current electricity bill comes out to about $2,000-$4,000 range a month.  It varies depending if I’m actively in my So Cal home.
Regarding the ram.  I’m not buying massive amounts of ram right now.  I’m going to start off with only 32 gigs.  When I need more to increase performance, then I’ll buy more.

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Posted: 06 September 2008 03:33 PM   [ Ignore ]   [ # 39 ]
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Ok.  List of items bought/ordered/already have.

Acrylic
1 37x21.5 with flame polish 1/2 inch thickness (small scale tester)
1 4ftx8ft with flame polish 1.5inch thickness (final product)

Camera
1 Firefly MV
1 PS3 camera
1 Dragonfly Express

IR
1 5 meter Narrow Dimmable LED ribbon Flex reel 940nm
1 5 meter Narrow Dimmable LED ribbon Flex reel 850nm

MT Computer
1 PowerEdge Rack 900

Projector
2 Sony VPL-VW60
_________________________________________________________________________________________

Items that I need that I haven’t ordered yet.

Vellum
Rosco
Silicone

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Posted: 06 September 2008 07:52 PM   [ Ignore ]   [ # 40 ]
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Good luck, and keep up the good work. I think we are all a little jealous that we don’t have that much cash to put down on that sort of system, but we would love to see how powerful one can make their multi-touch system and how to put multi-touch to new uses.

I got one question before you order anymore projectors. Do you really want to have these projectors that increase the depth of your multi touch system by a bit more or would you rather go with an LCD screen with the backlight removed and then use a camera with a mirror or a wide angle lens to reduce the projection distance?

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Posted: 07 September 2008 10:27 AM   [ Ignore ]   [ # 41 ]
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Last night was my first attempted in applying silicone on vellum using a cradle caulk gun (never used before).  I cut the tip of the silicone tube with a 2.5mm diameter opening (realized that I needed to cut deeper into the tube tip), placed the tube in the cradle, and started to trigger away.  Nothing was coming out and thought front portion of tube must be filled with air so I kept at it.  Spine of gun was half way in but no silicone but I could smell the sharp and unpleasant odor, as tinkerman pointed out in his experience with the stuff.  Pulled spine and silicone backfired out from rear.  Got it all over my hands and gun.  Dumped a glob of it in a container with xylol, washed my hands, mixed the two ingredients, applied it to the vellum, and went through the motions tinkerman did on his video.

Modified PS3 camera, loosely placed ir led ribbon on sides of acrylic, and realized Alex’s driver didn’t work for me on my tablet.  Went to Circuit City, bought PS3 console, plugged in camera, opened start new chat option, and tested.  Saw blobs, was satisfied, went to sleep. 

Note:  PS3 camera image is very unclear (played with the focus on the camera too but still looks unfocused/blurred).  Don’t know if it’s normally like that because I took out the ir filter before trying to make it work with the PC with Alex’s driver and test.

Rosco resellers closed on Sunday.  Must wait until Monday to purchase.  I’ll contact Motion Computing to get my hands on some of their View Anywhere solution and see if it can’t be applied to to MT.
Link for info.  http://motioncomputing.com/choose/spec_vad.htm.

Going to purchase more silicone and other types of diffusers to test.

Will also firmly attach LED ribbons in to frame and acrylic.

Don’t like dealing to much with silicone myself.  Going to order custom silicone sheets with texture to obtain similar characteristics as JH’s (Jeff Han) MT.  Will send samples to key nui members like tinkerman.

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Posted: 07 September 2008 01:18 PM   [ Ignore ]   [ # 42 ]
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Endlighten Acrylic seems to be the ideal choice for ftir.  I’ll order a 30x20 1/2inch thick to test the blobs for myself. 

Anyone else done this?

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Posted: 07 September 2008 01:19 PM   [ Ignore ]   [ # 43 ]
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Out of morbid curiosity what lights are you using the 850 or the 940?

*Edit* IR Strip Lights, the ones you ordered from EnviromentalLights.com

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Posted: 07 September 2008 01:21 PM   [ Ignore ]   [ # 44 ]
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??? what?  What do you mean what lights?

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Posted: 07 September 2008 01:23 PM   [ Ignore ]   [ # 45 ]
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Endlighten Acrylic actually doesn’t produce FTIR very well since ‘TIR’ means the light is totalyl internally reflected where endlighten acrylic uses little particles that forces the light out (doesn’t keep it in). Therefore, a few people have used if for diffused illumination. If you’re interested in using endlighten for multitouch, you can find more info here under DSI: http://nuigroup.com/forums/viewthread/1982/

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