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question about passive 3D stereo using polarized

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lucas Grijander
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PostPosted: Thu Nov 20, 2008 12:56 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

Hi everybody!!

in my lab they want to re-use an old system composed by a Cyviz Stereo 3D Converter (xpo.2). It basically consists on a splitter which needs a frame-sequencial stereo source, and the output is two videos for two projectors (so passive stereo using polarized projectors & glasses). I am quite new with this 3D stuff... I think I should use OSG_STEREO_MODE with the QUAD_BUFFER option. My question is more about the graphics card required for that, do we need any special card for that? I have a laptop with a NVIDIA geforce 8700GT, do you think it is possible to use it like that?

many thanks in advance!

regards,

Jaime.
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Robert Osfield
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PostPosted: Thu Nov 20, 2008 1:02 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

Hi Jaime,

The way I would do passive stereo with two projectors is to attach the
projectors directly to the two outputs from the graphics card, and
then use horizontal split stereo to drive them. The OSG supports this
set up out of the box. Using this setup will avoid any need to use
quad buffer stereo and the limits on hardware/drivers that it
imposses, and it also the best way to drive such a system
quality/performance wise.

Robert.

On Thu, Nov 20, 2008 at 12:55 PM, lucas Grijander
<> wrote:
Quote:
Hi everybody!!

in my lab they want to re-use an old system composed by a Cyviz Stereo 3D
Converter (xpo.2). It basically consists on a splitter which needs a
frame-sequencial stereo source, and the output is two videos for two
projectors (so passive stereo using polarized projectors & glasses). I am
quite new with this 3D stuff... I think I should use OSG_STEREO_MODE with
the QUAD_BUFFER option. My question is more about the graphics card
required for that, do we need any special card for that? I have a laptop
with a NVIDIA geforce 8700GT, do you think it is possible to use it like
that?

many thanks in advance!

regards,

Jaime.

________________________________
Discover the new Windows Vista Learn more!





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lucas Grijander
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PostPosted: Thu Nov 20, 2008 1:17 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

Hi Robert,

the problem is that the video card I have has only one DVI output and an S-Video output, so I think they cannot work as two different outputs.

Jaime.


Quote:
Date: Thu, 20 Nov 2008 13:02:28 +0000
From:
To:
Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph

Hi Jaime,

The way I would do passive stereo with two projectors is to attach the
projectors directly to the two outputs from the graphics card, and
then use horizontal split stereo to drive them. The OSG supports this
set up out of the box. Using this setup will avoid any need to use
quad buffer stereo and the limits on hardware/drivers that it
imposses, and it also the best way to drive such a system
quality/performance wise.

Robert.

On Thu, Nov 20, 2008 at 12:55 PM, lucas Grijander
<> wrote:
Quote:
Hi everybody!!

in my lab they want to re-use an old system composed by a Cyviz Stereo 3D
Converter (xpo.2). It basically consists on a splitter which needs a
frame-sequencial stereo source, and the output is two videos for two
projectors (so passive stereo using polarized projectors & glasses). I am
quite new with this 3D stuff... I think I should use OSG_STEREO_MODE with
the QUAD_BUFFER option. My question is more about the graphics card
required for that, do we need any special card for that? I have a laptop
with a NVIDIA geforce 8700GT, do you think it is possible to use it like
that?

many thanks in advance!

regards,

Jaime.

________________________________
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Robert Osfield
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PostPosted: Thu Nov 20, 2008 1:43 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

Hi Lucas,

On Thu, Nov 20, 2008 at 1:17 PM, lucas Grijander
<> wrote:
Quote:
the problem is that the video card I have has only one DVI output and an
S-Video output, so I think they cannot work as two different outputs.

Wow. What card is it?

You could try the using quad buffer stereo. Or just rip out the card
and stick in a standard modern card that will have two DVI output on
it, it'll only cost a couple hundred dollars to get a decent new card.

Robert.


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lucas Grijander
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PostPosted: Thu Nov 20, 2008 1:55 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

hehe, it's not an old card! it's a new laptop Dell XPS M1730 with a nvidia Geforce 8700 GT, I think it's normal that there is no two outputs... isn't it?

Jaime.



Quote:
Date: Thu, 20 Nov 2008 13:43:42 +0000
From:
To:
Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph

Hi Lucas,

On Thu, Nov 20, 2008 at 1:17 PM, lucas Grijander
<> wrote:
Quote:
the problem is that the video card I have has only one DVI output and an
S-Video output, so I think they cannot work as two different outputs.

Wow. What card is it?

You could try the using quad buffer stereo. Or just rip out the card
and stick in a standard modern card that will have two DVI output on
it, it'll only cost a couple hundred dollars to get a decent new card.

Robert.

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Vincent.B
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Joined: 05 Jan 2009
Posts: 428
Location: Toulouse, France

PostPosted: Thu Nov 20, 2008 1:59 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

Can't you use OSG to render stereo pictures on the same output and use only one projector ? Osg_stereo example works like that if I remember well. I don't think two projector are needed.

Vincent.

2008/11/20 lucas Grijander < (
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Quote:
hehe, it's not an old card! it's a new laptop Dell XPS M1730 with a nvidia Geforce 8700 GT, I think it's normal that there is no two outputs... isn't it?

Jaime.



Quote:
Date: Thu, 20 Nov 2008 13:43:42 +0000
From: (
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Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph



Quote:
Hi Lucas,

On Thu, Nov 20, 2008 at 1:17 PM, lucas Grijander
< (
Only registered users can see emails on this board!
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)> wrote:
Quote:
the problem is that the video card I have has only one DVI output and an
S-Video output, so I think they cannot work as two different outputs.

Wow. What card is it?

You could try the using quad buffer stereo. Or just rip out the card
and stick in a standard modern card that will have two DVI output on
it, it'll only cost a couple hundred dollars to get a decent new card.

Robert.
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Robert Osfield
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PostPosted: Thu Nov 20, 2008 2:05 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

Hi Lucas,

On Thu, Nov 20, 2008 at 1:55 PM, lucas Grijander
<> wrote:
Quote:
hehe, it's not an old card! it's a new laptop Dell XPS M1730 with a nvidia
Geforce 8700 GT, I think it's normal that there is no two outputs... isn't
it?

Stereo and laptops aren't something that normally go together...

If you are lucky the drivers will support quad buffer stereo, but
there is good chance that they won't. Without this I'm out of ideas.

Robert.


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lucas Grijander
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PostPosted: Thu Nov 20, 2008 2:06 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

only one projector? but how do you create the 3D effect?

Jaime.


Date: Thu, 20 Nov 2008 14:59:37 +0100
From:
To:
Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph

Can't you use OSG to render stereo pictures on the same output and use only one projector ? Osg_stereo example works like that if I remember well. I don't think two projector are needed.

Vincent.

2008/11/20 lucas Grijander < (
Only registered users can see emails on this board!
Get registred or enter the forums!
)>
Quote:
hehe, it's not an old card! it's a new laptop Dell XPS M1730 with a nvidia Geforce 8700 GT, I think it's normal that there is no two outputs... isn't it?

Jaime.



Quote:
Date: Thu, 20 Nov 2008 13:43:42 +0000
From: (
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To: (
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Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph



Quote:
Hi Lucas,

On Thu, Nov 20, 2008 at 1:17 PM, lucas Grijander
< (
Only registered users can see emails on this board!
Get registred or enter the forums!
)> wrote:
Quote:
the problem is that the video card I have has only one DVI output and an
S-Video output, so I think they cannot work as two different outputs.

Wow. What card is it?

You could try the using quad buffer stereo. Or just rip out the card
and stick in a standard modern card that will have two DVI output on
it, it'll only cost a couple hundred dollars to get a decent new card.

Robert.
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Vincent.B
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Joined: 05 Jan 2009
Posts: 428
Location: Toulouse, France

PostPosted: Thu Nov 20, 2008 2:12 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

2008/11/20 lucas Grijander < (
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Quote:
only one projector? but how do you create the 3D effect?

Jaime.


With the filtered glasses.

The passive stereo effect is just that : 2 picture with 2 colored components (red and blue basically) projeted on a wall/screen with the interval between the pictures equal to the distance between the eye (~6cm). The filtered glasses give each eye a different picture, and the brain have the 3D illusion,

The active stereo need 2 synchronized projectors and synchronized glasses to have the 3D effect. This needs special equipment.

Vincent


Quote:


Date: Thu, 20 Nov 2008 14:59:37 +0100
From: (
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To: (
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Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph

Can't you use OSG to render stereo pictures on the same output and use only one projector ? Osg_stereo example works like that if I remember well. I don't think two projector are needed.

Vincent.

2008/11/20 lucas Grijander < (
Only registered users can see emails on this board!
Get registred or enter the forums!
)>
Quote:
hehe, it's not an old card! it's a new laptop Dell XPS M1730 with a nvidia Geforce 8700 GT, I think it's normal that there is no two outputs... isn't it?

Jaime.



Quote:
Date: Thu, 20 Nov 2008 13:43:42 +0000
From: (
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To: (
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Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph



Quote:
Hi Lucas,

On Thu, Nov 20, 2008 at 1:17 PM, lucas Grijander
< (
Only registered users can see emails on this board!
Get registred or enter the forums!
)> wrote:
Quote:
the problem is that the video card I have has only one DVI output and an
S-Video output, so I think they cannot work as two different outputs.

Wow. What card is it?

You could try the using quad buffer stereo. Or just rip out the card
and stick in a standard modern card that will have two DVI output on
it, it'll only cost a couple hundred dollars to get a decent new card.

Robert.
_______________________________________________
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lucas Grijander
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PostPosted: Thu Nov 20, 2008 2:15 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

you are right, but I have polarized glasses that go together with the polarized lenses of the projectors. I think we can have much better quality like that.

Jaime.

Date: Thu, 20 Nov 2008 15:12:13 +0100
From:
To:
Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph



2008/11/20 lucas Grijander < (
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Quote:
only one projector? but how do you create the 3D effect?

Jaime.


With the filtered glasses.

The passive stereo effect is just that : 2 picture with 2 colored components (red and blue basically) projeted on a wall/screen with the interval between the pictures equal to the distance between the eye (~6cm). The filtered glasses give each eye a different picture, and the brain have the 3D illusion,

The active stereo need 2 synchronized projectors and synchronized glasses to have the 3D effect. This needs special equipment.

Vincent


Quote:


Date: Thu, 20 Nov 2008 14:59:37 +0100
From: (
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To: (
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Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph

Can't you use OSG to render stereo pictures on the same output and use only one projector ? Osg_stereo example works like that if I remember well. I don't think two projector are needed.

Vincent.

2008/11/20 lucas Grijander < (
Only registered users can see emails on this board!
Get registred or enter the forums!
)>
Quote:
hehe, it's not an old card! it's a new laptop Dell XPS M1730 with a nvidia Geforce 8700 GT, I think it's normal that there is no two outputs... isn't it?

Jaime.



Quote:
Date: Thu, 20 Nov 2008 13:43:42 +0000
From: (
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To: (
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Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph



Quote:
Hi Lucas,

On Thu, Nov 20, 2008 at 1:17 PM, lucas Grijander
< (
Only registered users can see emails on this board!
Get registred or enter the forums!
)> wrote:
Quote:
the problem is that the video card I have has only one DVI output and an
S-Video output, so I think they cannot work as two different outputs.

Wow. What card is it?

You could try the using quad buffer stereo. Or just rip out the card
and stick in a standard modern card that will have two DVI output on
it, it'll only cost a couple hundred dollars to get a decent new card.

Robert.
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Paul Melis
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PostPosted: Thu Nov 20, 2008 2:21 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

lucas Grijander wrote:
Quote:
Hi everybody!!

in my lab they want to re-use an old system composed by a Cyviz Stereo
3D Converter (xpo.2).
I just checked the manufacturer's page: those things are still sold at a
whopping 10,000 pounds. Better put them to use Wink

Paul
Quote:
It basically consists on a splitter which needs a frame-sequencial
stereo source, and the output is two videos for two projectors (so
passive stereo using polarized projectors & glasses). I am quite new
with this 3D stuff... I think I should use OSG_STEREO_MODE with the
QUAD_BUFFER option. My question is more about the graphics card
required for that, do we need any special card for that? I have a
laptop with a NVIDIA geforce 8700GT, do you think it is possible to
use it like that?

many thanks in advance!

regards,

Jaime.

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Vincent.B
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Joined: 05 Jan 2009
Posts: 428
Location: Toulouse, France

PostPosted: Thu Nov 20, 2008 2:29 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

2008/11/20 Paul Melis < (
Only registered users can see emails on this board!
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Quote:
lucas Grijander wrote:
Quote:
you are right, but I have polarized glasses that go together with the polarized lenses of the projectors. I think we can have much better quality like that.

You might be surprised. Depending on the polarization type and filter quality there can be a lot of ghosting in the images. You also need a good alignment on your projectors.

Of course, the calibration and the settings of the material will be a little complicated at the beginning. But With this material, active stereo is possible, and this will render very well.
Without 2 graphic output on your graphic card, I would be very difficult to set an active stereo I think... maybe with special synchronisation to allow the projectors to get the output each one after the other ? I don't know...

By the way, this seems to be good material, have fun Smile


Quote:
But polarized glasses are a lot more convenient to wear than those bloody shutter glasses.

Very Happy

Vincent.

Quote:


Paul

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Paul Melis
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PostPosted: Thu Nov 20, 2008 2:33 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

Vincent Bourdier wrote:
Quote:


2008/11/20 Paul Melis < <mailto:>>

lucas Grijander wrote:

you are right, but I have polarized glasses that go together
with the polarized lenses of the projectors. I think we can
have much better quality like that.

You might be surprised. Depending on the polarization type and
filter quality there can be a lot of ghosting in the images. You
also need a good alignment on your projectors.


Of course, the calibration and the settings of the material will be a
little complicated at the beginning. But With this material, active
stereo is possible, and this will render very well.
Without 2 graphic output on your graphic card, I would be very
difficult to set an active stereo I think... maybe with special
synchronisation to allow the projectors to get the output each one
after the other ? I don't know...

By the way, this seems to be good material, have fun Smile
As the OP already seems to have projectors and polarization filters and
such it would be easiest to just find a PC with 2 outputs and drive the
projectors directly, as Robert suggested.
In case he does: remember to use a projection surface that doesn't
destroy the polarization Wink
Quote:

But polarized glasses are a lot more convenient to wear than those
bloody shutter glasses.


Very Happy
Yesterday I showed a group of students anaglyphic pictures after giving
them the red-blue glasses. Quite funny to see a classroom full of those
things Smile
And even those are still more fashionable than crystaleyes...

P



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Vincent.B
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Joined: 05 Jan 2009
Posts: 428
Location: Toulouse, France

PostPosted: Thu Nov 20, 2008 2:45 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

2008/11/20 Paul Melis < (
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Quote:
Vincent Bourdier wrote:
Quote:


2008/11/20 Paul Melis < (
Only registered users can see emails on this board!
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) <mailto: (
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)>>

lucas Grijander wrote:

you are right, but I have polarized glasses that go together
with the polarized lenses of the projectors. I think we can
have much better quality like that.

You might be surprised. Depending on the polarization type and
filter quality there can be a lot of ghosting in the images. You
also need a good alignment on your projectors.


Of course, the calibration and the settings of the material will be a little complicated at the beginning. But With this material, active stereo is possible, and this will render very well.
Without 2 graphic output on your graphic card, I would be very difficult to set an active stereo I think... maybe with special synchronisation to allow the projectors to get the output each one after the other ? I don't know...

By the way, this seems to be good material, have fun Smile

As the OP already seems to have projectors and polarization filters and such it would be easiest to just find a PC with 2 outputs and drive the projectors directly, as Robert suggested.
In case he does: remember to use a projection surface that doesn't destroy the polarization Wink
Quote:

But polarized glasses are a lot more convenient to wear than those
bloody shutter glasses.


Very Happy

Yesterday I showed a group of students anaglyphic pictures after giving them the red-blue glasses. Quite funny to see a classroom full of those things Smile
And even those are still more fashionable than crystaleyes...



Off topic question but : Where did you find theses glasses ? very difficult to find it in France, as free of course...


Quote:


P

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lucas Grijander
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PostPosted: Thu Nov 20, 2008 2:49 pm    Post subject:
question about passive 3D stereo using polarized
Reply with quote

I'm trying to find if my geforce 8700M GT in my laptops accepts quad-buffer... how do you find that?

I also agree with you, maybe it's better to find a computer with double output.

We already have the non-polarized surface... as you say, we have a very good stuff here, so we must use it!!

Jaime.

Quote:
Date: Thu, 20 Nov 2008 15:31:34 +0100
From:
To:
Subject: Re: question about passive 3D stereo using polarized projectors and openscenegraph

Vincent Bourdier wrote:
Quote:


2008/11/20 Paul Melis < <mailto:>>

lucas Grijander wrote:

you are right, but I have polarized glasses that go together
with the polarized lenses of the projectors. I think we can
have much better quality like that.

You might be surprised. Depending on the polarization type and
filter quality there can be a lot of ghosting in the images. You
also need a good alignment on your projectors.


Of course, the calibration and the settings of the material will be a
little complicated at the beginning. But With this material, active
stereo is possible, and this will render very well.
Without 2 graphic output on your graphic card, I would be very
difficult to set an active stereo I think... maybe with special
synchronisation to allow the projectors to get the output each one
after the other ? I don't know...

By the way, this seems to be good material, have fun Smile
As the OP already seems to have projectors and polarization filters and
such it would be easiest to just find a PC with 2 outputs and drive the
projectors directly, as Robert suggested.
In case he does: remember to use a projection surface that doesn't
destroy the polarization Wink
Quote:

But polarized glasses are a lot more convenient to wear than those
bloody shutter glasses.


Very Happy
Yesterday I showed a group of students anaglyphic pictures after giving
them the red-blue glasses. Quite funny to see a classroom full of those
things Smile
And even those are still more fashionable than crystaleyes...

P


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