CurtPalme.com Home Theater Forum

martinlandau · Joined: 21 Feb 2009 Posts: 10

http://www.nvidia.com/object/GeForce_3D_Vision_Main.html

Who here has gotten this working on a crt projector? I have a 1272 in storage and was thinking about using this. I undertand the 1272 only has about 85 mhz of bandwidth, so would 800x600 at 120hz (allowing 60hz to each eye) work? Perhaps you can use 100hz with higher resolution - but has this caused eyestrain/headaches? Thanks. Someone told me the green phosphor doesn't decay fast enough and you will get crosstalk with certain crt projectors but he couldn't elaborate which projectors suffered from this.

martinlandau · Joined: 21 Feb 2009 Posts: 10

Curt told me he was certain there would be someone in the community that would have some experience, ridley scott and james cameron are both going 3D with thier new movies, certainly this must interest someone here.

Clarence · Posted: Wed Apr 22, 2009 4:20 am Post subject:

Interesting... there are only 3 places in the US that have demo systems and this week my hotel is only a couple of miles between 2 of them... Santa Clara and Sunnyvale:
http://www.nvidia.com/object/GeForce_3D_Vision_Test_Drive_Centers.html

I have some CrystalEyes 3D shutter glasses that I used with some of my company's 3D enabled visualization software, but I've never tried it with a projector.

martinlandau · Joined: 21 Feb 2009 Posts: 10

ecrabb · Posted: Wed Apr 22, 2009 4:40 pm Post subject:

I'm not surprised that the CrystalEyes glasses work better than the Nvidia glasses - the The CrystalEyes glasses were/are a commercial product and were pretty expensive, IIRC.

The only machines that typically have fast-refresh green phosphor in them are projectors specifically going into 3D/sim environments - usually Barco or Electrohome/Christie/TAN machines, though I think a couple of machines from Sony and NEC might have had fast green tubes, too. For what it's worth, I used to look at 3D on CRT's all the time back when I used to do some work with a VR systems integrator, but it was always on the aforementioned higher-end machines; I've never tried it on a lower-end machine.

That said, I'm sure you could run the 1272 at 800x600@100hz and get a decent picture, but you will have some crosstalk/smearing because of the long-decay green phosphor. You'll also have some flicker, but it shouldn't be too bad at 50hz - that's the native refresh rate for our friends in Europe with PAL equipment.

Here's an interesting Barco Stereo brochure I've never seen that talks about active and passive stereo. There's a picture of a BR909 with a motorized polarizer for passive stereo that I never even new existed. Crazy!

http://www.stereo3d.com/Barco_Stereoscopic_proj.pdf

SC

Kiev Savoie · Joined: 25 Oct 2007 Posts: 432

that was very interesting. too bad so much light gets blocked by the filters but still cool. this just might be the excuse i need for a stack!

chillman · Joined: 09 Apr 2007 Posts: 134 Location: Germany, Bavaria

I tried stereo vision with my Ampro 3600 and some old ELSA IR shutter glasses I bought for 5 Euro or so. I used a Geforce 6600 with the old Nvidia stereo driver with 1024*768@120Hz and it worked really great! I tried some games like STALKER and that was really scary Wink

Unfortunately Nvidia then made contracts with some display producers and disabled support for shutter glasses. So if you want to try it out make sure you use a Geforce card not newer than 7XXX and the old stereo driver. There is also a modified driver which works with some 8XXX models. Check http://www.mtbs3d.com/ for more information.
Greets!
Tillman

Kiev Savoie · Joined: 25 Oct 2007 Posts: 432

i think i need to play with this idea once my system is up it's so much cooler than just having a big screen! i have a line on a pair of G70's, but it's sounds like it would work fine with just one PJ.

martinlandau · Joined: 21 Feb 2009 Posts: 10

chillman, how was the ghosting/crosstalk? Ecrabb makes the point according to Barco that the Green Tube will need to be fast refresh. Ecrabb - Where can I find one of these "fast refresh" green tubes for my Sony 1272? Are they sold by any dealers like curt?

Flicker on my old CRT 21 inch monitor cause headaches after about a 2 hour gaming session, and I like to game for about 8 hours at a time, so I will need to do at least 120hz, but the sony 1272 can do 150 hz right?

Chillman, also, you can use the newer Nvidia cards, but you have to buy the Geforce 3D vision kit. Then you can use thier xpand active shutter glasses or crystal eyes or others with your CRT projector. Bioshock or Fallout 3 with the newer cards supporting directx10 and 11 and stereo 3d are really immersive. You won't have to stack projectors so it is a cheap s3d crt solution.

sdumas · Joined: 23 Aug 2007 Posts: 39 Location: Montreal, Quebec

I am trying to make this work on my system. (This being the Nvidia Vision 3D).

I am using a fairly complex chain of HDMI "objects".

My HTPC is running a Nvidia GTS 250 - connected to a Xonar HDMI sound card - which in turn is connected to a Integra DTC 9.8 - then connects to an HDFury2 and then to GammaX and finally into my Barco Graphics 808.

Everything works fine in 720p and 1080p. I am using 60hz for both.

Now to get the 3D to work you need to have at least 100hz on a CRT. I can't go to 100hz in 1080p, but no problems in 720p. So here I go I cranking the frequency to 120 hz on 720p and I run the Nvidia 3D run tests. It came back as failed. Telling me my monitor is not "up to par".

My questions for you guys are:

1) Did anyone made that work in a "similar" config?
2) Does the HDFury and GammaX support 720p at 120 hz?
3) Does anyone know if the Xonar or the Integra would support 120 hz? (I think the Integra does in PassThrough mode).
4) any other ideas or the simple - "ain't gonna work in your lifetime" recommendation?

Thanks!

chillman · Joined: 09 Apr 2007 Posts: 134 Location: Germany, Bavaria

Sorry I can't help you, but want to answer the post before yours (although it's over a month old)
About the ghosting: Threre was some ghosting, but it wasn't that bad. If you want a perfect result you'd need a fast green tube, but if you only want to try it out, the normal green tube will be fine.
However, I wouldn't want to play 8 hours at a time with 3D stereo vision over a projector. I didn't get any headache of it, but it is defenitely more tiring for your eyes than 2D projection. This is not only caused by the flicker IMO.
I didn't know about the Nvidia 3D kit, thanks for telling me that.

sdumas · Joined: 23 Aug 2007 Posts: 39 Location: Montreal, Quebec

Ok - I got 3D Vision working on my Barco 808 projector on a 126" screen.... Woo Hoo!!!!

I get 720p (1280x720) at 100 hz. I stepped it down to 96hz to get a 4 multiplier of 24p. 120hz was a little too much for my projo and the image was a little smeared. but 100 or 96 is great.

It looks gooooood!.

If I don't crank the depth too much, I get no ghosting.

No thanks to Nvidia support team, I had to resolve my problem myself.

It was a problem of polarity. There is two solutions for this problem. If your analog monitor needs negative polarity (-,-) you can get something called a Box1020 (or 1021) which allows you to reverse polarity. Luckily for me, it happens that my projo has another input (port 3) that accepts a positive polarity. Problem solved.

I still would like to know where you can change the polarity so that the Nvidia control panel doesn't go into never neverland, but in the meantime I can finally enjoy 3D on a massive screen!!!!

You still need the monitor.inf file that unlocks all the resolution to make this work - otherwise you never get to that rez.

I have not tested yet with the whole path of HDMI - HDFury2 - GammaX and Port5. This is next. At least I can get 3D on port 3 at 720p.