CurtPalme.com Home Theater Forum

dokworm · Joined: 26 Oct 2010 Posts: 31

CIR Engineering · Posted: Fri Oct 29, 2010 1:03 am Post subject:

CIR Engineering · Posted: Fri Oct 29, 2010 1:06 am Post subject:

CIR Engineering · Posted: Fri Oct 29, 2010 1:18 am Post subject:

overclkr · Joined: 08 Mar 2006 Posts: 4227

dokworm · Joined: 26 Oct 2010 Posts: 31

speedyandre · Joined: 18 Dec 2006 Posts: 291 Location: Netherlands

dokworm · Joined: 26 Oct 2010 Posts: 31

A silver screen is the only option if you want to use two projectors and passive glasses, as it is a method that uses polarised light, and normal screens mess up the polarisation and therefore destroy the 3D effect. You can use certain silver paint, certain silver fabric (monroe) or pay for a commercial silver screen.

In My experience the polarised systems don't block the light as much as the shutter glasses do, and you have two projectors pumping out light instead of one.
The hassle is, well, almost the same as doing a stack. You have two projectors to keep aligned and calibrated and the screen can hotspot.

mhalsan · Joined: 09 Nov 2007 Posts: 146 Location: Astoria, Oregon

What dokworm said above is right. There's a lot more to set up, adjust and tinker with- but if I didn't enjoy that I'd have gone digital to begin with. Polarized filters and glasses do reduce light, but this is still a LOT brighter than the Nvidia 3DVision setup (with a single 9500) I played with last February.

It looks like 3D Blu-ray is going to require a software solution. There are several products on the web that can do this. My preference would be a single product (like Peter's player) that handles the whole thing. There are only a couple 3DBD titles out right now, at astronomical prices, so I can wait..........

Thanks, Mark

dokworm · Joined: 26 Oct 2010 Posts: 31

Absolutely, the polarised setup is way, way brighter, and is great as you can then afford as many glasses as you want, and there is no problem if kids wreck a pair. Polarising material big enough to sit in front of the CRTs can be tricky to find, (I always wondered if you could steal the film out of broken LCD monitors as a cheap alternative, but haven't tried it), but if you can get it right, it is pretty cool.
An awesome side affect for gamers is you can play two games on the same screen! Each player only sees their game in progress, which is fun for a night of 2 player HALO or Gran-turismo etc. if your friends bring a console over, you link them up and hook each console to its own projector. You make some glasses that just have 2 left eye lenses and some that have two right-eye lenses and it is great fun.
You could also show two movies at once if you had headphones I guess, it isn't really all that practical, but it is funny to swap glasses and see a different movie running.

BTW, a new beta of SSIFSucka is up for testing.
http://gl.tter.org/SSIFsucka/SSIFsucka_Beta3.exe

prover · Joined: 07 Nov 2008 Posts: 166 Location: Stuttgart, Germany

Polarizing materials are easy to get meanwhile. Newly I have seen in an internet shop
a polarizing foil (63cmx90cm) big enough even for a CRT under 200$.

**kal** · Posted: Thu Nov 04, 2010 12:35 am Post subject:

Hi guys,

Moome is now taking pre-orders for him HDMI 1.4 3D box. For complete details and manual, see: http://www.curtpalme.com/EXT-FULLHD.shtm

He's offering $50 off for pre-orders too!

Kal

nemmi69 · Joined: 24 Aug 2007 Posts: 60

bofr · Joined: 03 Feb 2008 Posts: 28

After spending a fruitful? weekend I too have now managed to get 3d on my crt.

Dug out a pair of old (ca -95) shutterglasses that came with a controller for the parallel port.
Knocked up a very quick interface so that the old controller now can be operated by vsync.
(Flip-flop and some resistors and you can do it in 10 min, I did not find a flip-flop so i made the converter
using a microcontroller instead...At least this way i can adjust timings in software)

It works quite well.
Compared to my normal crt-monitor there is more ghosting on green, the rest is pretty much the same.
Still...not any worse than what I've seen in electronics stores on lcd screens...

The amount of light coming trough the glasses are more than halved...probably less than 25%.
Meaning having to keep the room completely dark and crank the contrast up to 80..(but at this point..so what)

But it works...o man does it work!

Quality-wise i had to drop the resolution a "bit" to get up to the required refresh-rates right now I am running
100 hz 1256x706 but tomorrow i will give 120 hz 1048x589 a try since i think 50hz/eye is likely to result in a headache
after a few hours (BD 808s, only goes up to 75khz).

Luckily, the loss of resolution is somewhat compensated for by the fact that two slightly offset images are displayed so that
the brain takes in a lot more information.
Meaning things seem a lot sharper than they have a right to.

I've set it up so that the 3d-player automatically switches to the proper resolution and refresh when I play 3d-content in fullscreen.
That way normal movies aren't impacted.

Since this project has cost me nothing but some free time (that i probably would have wasted anyway) I have to say it's worthwhile.
If I had to shell out hard cash to do this I wouldn't. Not this way at least.
I think passive 3d is the way forward. Two inexpensive projectors, polarized screen and cheap glasses...
Getting light, quality and high refresh in an active setup seems very expensive at this point.

A small HMD-setup might be worth a try but that means only one person can watch it at a time..plus they are heavy and uncomfortable.

/bofr

overclkr · Joined: 08 Mar 2006 Posts: 4227

nemmi69 · Joined: 24 Aug 2007 Posts: 60

What is the best 3D glasses at a reasonable price? Whats the best way to get the glasses to work with the set up?

I have a Sony G70 and Moome ext-fullhd v3

bofr · Joined: 03 Feb 2008 Posts: 28

Just a hint..
while the specifications for your projector might say one thing, the reality might be something different..
My BD808s has a max sync at either 69khz or 75 khz depending on who you believe. Apparently there is enough leeway
in this to allow 1280x720@100hz which works out to about 76kHz.
Your mileage might vary, experiment on your own risk etc...

/bofr

prover · Joined: 07 Nov 2008 Posts: 166 Location: Stuttgart, Germany

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

whats all this fuss with shutter glasses, i prefer the polarised any day.

KrisRoberts · Joined: 21 Jan 2007 Posts: 115 Location: San Diego

I agree, and of the 3D displays I saw at CES the LG CF3D LCoS 1080p projector with passive glasses was easily the best.

For me the biggest obstacle for a passive system in my theater is the requirement of a silver screen to retain the polarization. With a CRT that would also probably result in severe hot spotting. But so far I've been using digitals for 3D anyway.

Passive flat panel displays typically only show half the resolution to each eye. Passive projection systems require a silver screen and either a single projector capable of oscillating its polarization each frame or two projectors stacked (not easy to align perfectly).

Active shutter glasses are attractive because its pretty easy to do 100-120hz these days and you can show a full resolution image to each eye.

I recently bit the bullet for the Moome EXT V3 and got the Gen2 emitter from these guys which should be compatible with the nVidia 3D-Vision glasses I already have (as well as supporting lots of other glasses):
http://www.3dmagic.com/catalog/Gen2hometransmitter.html

The neatest universal glasses I've seen are the Volfoni ACTIVEYES. They put the IR receiver, battery and other electronics in a little dongle you clip to your shirt and that allows the glasses themselves to be as light and comfortable as passive ones:
http://volfoni.com/article.php3?id_article=238