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jradwanski
Joined: 31 Aug 2009
Posts: 40
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 Link Posted: Tue Mar 23, 2010 2:17 am Post subject: passive 3d projection |
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Hello all I am trying to setup a 3d rear projection theater. I have two marquee projectors. I am looking for a mount for the polarisers or specs on how to make one any help would be greatly appreciated I will be driving the projectors via pc and already have the software.
I also am looking for any information on diy screens for 3d rear projection. any info would be greatly appreciated.
The screen size would be small about 100 inch 16x9 with 2 9500lc projectors.
Thanks for all your help
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ecrabb
Joined: 13 Mar 2006
Posts: 12680
Location: Iowa
TV/Projector: JVC RS45
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| Link Posted: Tue Mar 23, 2010 2:30 am Post subject: |
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Hmmm... I'd be surprised if passive 3d is even possible with RP...  
SC
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jradwanski
Joined: 31 Aug 2009
Posts: 40
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| Link Posted: Tue Mar 23, 2010 2:49 am Post subject: |
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the top makers have different screens but are so expensive there must be something that is cheaper I can get the screens but it is the filter holders and such that i need the most info about. dalite stewert etc have 3d passive rp screens
I just need to know what they are like or made out of
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ecrabb
Joined: 13 Mar 2006
Posts: 12680
Location: Iowa
TV/Projector: JVC RS45
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| Link Posted: Tue Mar 23, 2010 3:15 am Post subject: |
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Hmm... OK, I'm gonna have to do some reading, because I have no idea what the hell the "open/closed ratio" is...
| Stewart site wrote: | | TechScreen 150 excellent for use in 3D applications and preserves polarized stereoscopic images, via a high open/closed ratio. |
Interesting.
I think the polarizing filters are going to be the easy part.
SC
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dturco
Joined: 06 Feb 2009
Posts: 3774
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Link Posted: Tue Mar 23, 2010 3:16 am Post subject: |
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Hurley Screens has 3-D stuff too.
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mhalsan
Joined: 09 Nov 2007
Posts: 146
Location: Astoria, Oregon
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| Link Posted: Tue Mar 23, 2010 5:13 am Post subject: |
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I'm working on the same thing, with front projection.
For polarizing filters and matching glasses, check here:
www.berezin.com
www.polarization.com
There's the choice of linear or circular polarization.
I've noticed in the 3D gaming forums, there are proponents of both.
About the rear projection material- the ready-made material is pricey, and I'm not sure that there is a home-made alternative.
Any way you could do front projection? There are at least two paint-on products rated for nondepolarizing applications. I can't use these, as the front speakers are behind the screen.
A link to 3d screen fabric comparisons:
http://www.studio3d.com/pages2/silver_screens.html
Are you using the IZ3D driver?
Keep us posted!
Thanks, Mark
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jradwanski
Joined: 31 Aug 2009
Posts: 40
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| Link Posted: Tue Mar 23, 2010 6:16 am Post subject: |
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yest i am using the iz3d driver the bigest problem i am running into is how to mount the polarizer. have you ever seen any of the premade rp 3d screen matierial??? if i could see chunk of it i could probably make it with out any really big problem dalite has a rp fabric that is supposed to be 100% non depolarizing I mean really how many fabrics could it be
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mhalsan
Joined: 09 Nov 2007
Posts: 146
Location: Astoria, Oregon
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| Link Posted: Tue Mar 23, 2010 2:36 pm Post subject: |
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I would ask a screen dealer for a product sample. This is common enough request, you can usually get a 6" square for very little cost.
A google search for "DaLite Screens" brings up many on-line dealers. I'd check with one of the bigger dealers first. B&H Photo has been around for a long while and might be a good starting point.
The only RP material I have dealt with personally is the plastic stuff used in standard rear projection CRT sets. The material rated for nondepolarizing applications is sure to be very different.
Thanks, Mark
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ecrabb
Joined: 13 Mar 2006
Posts: 12680
Location: Iowa
TV/Projector: JVC RS45
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| Link Posted: Tue Mar 23, 2010 3:05 pm Post subject: |
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The set of commercial CRT-specific polarizers I saw here a few years ago just looked like a set of lens caps... A ring with the center cut out, and the filter material attached. It's not rocket science - you could easily hand-make something. From coffee can lids, to an ugly cardboard band, to a nicer plastic band, all the way to having a bezel cut out of lexan or something.
SC
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jradwanski
Joined: 31 Aug 2009
Posts: 40
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| Link Posted: Thu Mar 25, 2010 1:14 pm Post subject: |
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that would be good but i would have to circular polarizers if i did not i woudl have trouble aligning all three to the same angle. can we say multi color ghosting.
but that is a good idea though.
I have been doing some research the dalite 3d virtual black is rating very high as a rear projection screen material and it is just translucent black vinyl that should be easy to find I will let you know how it works once i get a smoke shower curtain
or maybe a large sheet of glass with gray window tint  since it would be esentially the same thing and look great as a tv like screen
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ecrabb
Joined: 13 Mar 2006
Posts: 12680
Location: Iowa
TV/Projector: JVC RS45
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| Link Posted: Thu Mar 25, 2010 2:30 pm Post subject: |
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| jradwanski wrote: | | that would be good but i would have to circular polarizers if i did not i woudl have trouble aligning all three to the same angle. can we say multi color ghosting. but that is a good idea though. |
No big deal. Put the lenses on the projector, put the glasses on, level your head, and twist the polarizers until they're each the brightest/darkest in their respective eyes. Again - it isn't rocket science.
I couldn't find much of anything on the whole "open/closed ratio" thing mentioned in the Stewart documentation. The only couple of references I could find that referred to the term was relating to the sintering process - heating a powder to melt it into a solid - and it referred the resulting porosity of the material. I assume that's what Stewart is referring to - porosity. I think the porosity in the material is what creates the diffusion. If there was no porosity, it would be transparent - like a piece of glass. I don't know, though... I'm just guessing.
The Da-lite material sounds interesting... But, I assume the "smoked" is more for digitals with poor black levels... I think with CRT, you could go to a non-tinted. I think with the polarizing filters and glasses, you're going to want to keep all the light output you can get.
SC
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AnalogRocks
Moderator
Joined: 08 Mar 2006
Posts: 21091
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Link Posted: Thu Mar 25, 2010 4:41 pm Post subject: |
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| ecrabb wrote: | I think with CRT, you could go to a non-tinted. I think with the polarizing filters and glasses, you're going to want to keep all the light output you can get.
SC |
I'd have to agree with you there SC, think of a polarizer on a camera lens. You loose what? 2 f/stops? That's substantial.
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jradwanski
Joined: 31 Aug 2009
Posts: 40
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| Link Posted: Thu Mar 25, 2010 6:18 pm Post subject: |
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very true that is why circular polarized would be better the extinction rates anre not as high and the slightly darker material would help counteract ghosting.
I will be doing a smaller screen than anticipated only 80" wide that should be nice and bright with a 9500lc for each eye.
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WanMan
Joined: 19 Mar 2006
Posts: 9668
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| Link Posted: Thu Mar 25, 2010 6:50 pm Post subject: |
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You know, I read this thread's topic and immediately thought of my wife's bobbies in my face. 
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Trust no one. Absolutely no one. Advice of the board.
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ecrabb
Joined: 13 Mar 2006
Posts: 12680
Location: Iowa
TV/Projector: JVC RS45
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| Link Posted: Thu Mar 25, 2010 6:59 pm Post subject: |
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Wan, I'm pretty sure that would be ACTIVE stereo!!! 
SC
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WanMan
Joined: 19 Mar 2006
Posts: 9668
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| Link Posted: Fri Mar 26, 2010 1:12 am Post subject: |
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I was thinking my was was making a pass at me be projected boobies.
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Trust no one. Absolutely no one. Advice of the board.
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dturco
Joined: 06 Feb 2009
Posts: 3774
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Link Posted: Fri Mar 26, 2010 2:05 am Post subject: |
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| WanMan wrote: | | I was thinking my was was making a pass at me be projected boobies. |
WTF?
_________________
Firefly rules. Can't stop the signal.
http://www.hulu.com/firefly
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ecrabb
Joined: 13 Mar 2006
Posts: 12680
Location: Iowa
TV/Projector: JVC RS45
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| Link Posted: Fri Mar 26, 2010 2:11 am Post subject: |
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| WanMan wrote: | | I was thinking my was was making a pass at me be projected boobies. |
Looks like a Russian or Chinese spammer hacked WanMan's account!!!
SC
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dturco
Joined: 06 Feb 2009
Posts: 3774
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Link Posted: Fri Mar 26, 2010 2:23 am Post subject: |
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| ecrabb wrote: | | WanMan wrote: | | I was thinking my was was making a pass at me be projected boobies. |
Looks like a Russian or Chinese spammer hacked WanMan's account!!!
SC |
How would we be able to tell the difference anyway? 
_________________
Firefly rules. Can't stop the signal.
http://www.hulu.com/firefly
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