@cerp
wow sounds interesting, but what are the benefits?

cerupcat - 16 June 2008 01:13 PM

I e-mail professional plastics for a price quote. I’ll let you know the price when I get it. I asked for 1/4” (6mm) and 1/2” (12mm) in there full sheet size 120” x 80” and if they sell smaller sheets.

I had a thought in possibly combining FTIR and DI with this technique. In the lab we are experimenting with pulsing and syncing light to the camera. If there was a top thick piece of acrylic 1/2” (12mm) FTIR and then a piece of Endlighten (DI) directly under it, then we could oscillate between the two LED sources. Therefore can see the FTIR from the top sheet in one camera frame (DI/Endlighten lights off) and then next frame, turn the FTIR LEDs off and Endlighten ones on. If that makes sense.

hey cerupcat… interesting idea, but a question wouldn’t the endlighten diffuse the IR light coming from the inputs from the FTIR screen ??

noverflow - 16 June 2008 12:07 PM

I have been tryng hard to get my hands on some Endlighten. ANyone know where/ how in the US?

Everyone I’ve spoken to here in the US doesn’t carry it in stock… You’d have to order an entire case of it (8-15 sheets depending on thickness)…

Snoopy_WG - 22 July 2008 01:14 PM

noverflow - 16 June 2008 12:07 PM

I have been tryng hard to get my hands on some Endlighten. ANyone know where/ how in the US?

Everyone I’ve spoken to here in the US doesn’t carry it in stock… You’d have to order an entire case of it (8-15 sheets depending on thickness)...

WOW.... No go there

Wow, that really sux guys. Well I guess we would have to keep on looking for a supplier then. I have to buy a huge piece as well here in switzerland as well.
But my university pays for it, so its not that bad. If anyone finds anything, please post it in this thread..

skeeet - 16 June 2008 12:33 AM

Tinkerman - 15 June 2008 05:43 PM

…
That last letter is key to the function. R=reflection by making one side frosted, the IR light reflections become very perturbed by th euneven surface and scatter all over escaping over the entire surface.

That was exactly what i mean
Whatever, if my theory will not work, i’ll definitely will use original DSI method from Tim.

Any result from your test with frosted acrylic?

Yep. It was bad idea about frosted acrylyc

Hi Guys,

I think it’s worth trying out the EndLighten - so I’m ordering a sheet and splitting it up between a few people doing table dev. If anyone is interested in 1/4 sheet I’ll have a little extra I could sell.

Here is the deal: Cyro Makes the stuff, they are based out N Jersey.
Yadda Mendez was able to tell me a distributer in my area, and give me their number - 973-541-8263

I live in Mass. and my distributer sells it typically 8-15 sheets in a bundle. Each sheet is:
6mm: 615$ per 120 inch by 80 inch sheet (huge!)
8mm: 720$ per same
10mm: 800$

So it’s like 200$ per 40 x 60 piece. twice the price of a 3/8 inch acrylic. Worth experimenting with for sure.
If you say you are prototyping for a big research grant - they should give you a single sheet - but they really won’t cut it up, because then they lose money.

Thanks Tim for posting about this, hopefully we can learn from each other.

hi seth,

yeah, thats about the same price I pay in switzerland. I also have to buy a sheet like that.
I am just finished my own basic dsi setup. It works, but the box is still missing.The Hardware
works good though. I attached some crappy phonecam pics, and some better quality ones
from the building of the frame…

Hey Tim what type of mirror are you using there its really thick!! And is that rosco grey you have on top of the screen?

I thinking because of the properties you may need to change your config file to work for DI and not FTIR… maybe?

@taha

its a front surface mirror that is made from a reflective foil. Its like a art canvas, but with a refelctive foil.
It costs about 100 euros and unfortunately its the smallest siza available (half the size would be enough).
Real front surface mirrors that are made from glass cost 5-10 times as much

The company that makes the is here: http://www.alluvial.de/cat1050.html
The resellr I got it from here: http://www.screen-tech.de/main.html (ST-AV-HS)

the screen I am using is from lumin, its called “light screen”. Its really expensive, but also very good.
I wouldn`t have got it for myself, but these where some leftovers from other projects..
If you are looking for some good scren material for DI setups, I would recommend “Gerriets Optitrans”,
which is in aboout the same price range as rosco..

hi tim,

Thanks for posting pictures - does this material require a greater density of LEDS in your opinion? I noticed you used a lot - and on all 4 sides. I’m trying to decide if I need to order more LEDs.

Nice setup with the frame - do you drill a bit into the acrylic? I like to drill a hole so that the LEDs have a nice pressure fit into the material so not too much light is lost.

well 2 weeks from now I can begin my experiments.

Hi Tim.
Is it silicone rubber on top of the acrylic on third picture? If yes - just wonderig why?

@skeeet

its a projection screen

Tim Roth - 23 July 2008 11:34 PM

@taha
the screen I am using is from lumin, its called “light screen”. Its really expensive, but also very good.
I wouldn`t have got it for myself, but these where some leftovers from other projects..
If you are looking for some good scren material for DI setups, I would recommend “Gerriets Optitrans”,
which is in aboout the same price range as rosco..