[vtkusers] stereoskopic view with two projectors

[Weiguang Guan]

Hi Lachlan,

I'm a little confused of what you said. I was trying to create a passive 
stereo system, which is very similar to GeoWall. There is email addressing 
this written by Nicholas Schwarz with subject "Re: Stereo effect with two 
projectors and polarized lenses". They set nVidia into clone mode.

Using debug I found that 
vtkXOpenGLRenderWindow::vtkXOpenGLRenderWindowTryForVisual(...) cannot 
find out a stereo-capable visual. Then, I used glxinfo and could not find 
any stereo visual either. This is where the problem is. After that, I 
check XF86Config, and everything seems ok --- twinview, clone, stereo 4 
... 

Weiguang

-- 
========================================================
Weiguang Guan, Research Engineer
RHPCS, McMaster University
========================================================
On Mon, 28 Feb 2005, Lachlan Hurst wrote:

> Hi,
> Must say, i'm not 100% on the details of your system, but to run vtk with 
> SetStereoTypeToCrystalEyes you must have a display system capable of 
> refreshing at close to 120Hz (not sure on exact frequency).  The simple 
> example is to have a single monitor and suitable graphics card that supports 
> stereo and a fast refresh rate (you will also need active stereo glasses). 
> The method used for polarized projectors involves an external "frame 
> splitter" - whereby the graphics card outputs at 120Hz and the frame 
> splitter redirects every second frame to the other projector (splitter has 
> one video in two video out).
> An alternative method of stereo for polarized projectors only is as follows. 
> Do not clone the displays, create a vtk render window on each display and 
> simply set one renderer to left eye, and the other to right eye.
> 
> Good luck,
> Lachlan
> 
> ----- Original Message ----- 
> From: "Weiguang Guan" <guanw at rhpcs.mcmaster.ca>
> To: "trull78yaoo" <trull78yaoo at yahoo.de>
> Cc: <vtkusers at vtk.org>
> Sent: Saturday, February 26, 2005 6:32 AM
> Subject: Re: [vtkusers] stereoskopic view with two projectors
> 
> 
> Hi Jorg,
> 
> Have you made stereo work? If yes please let me know how. I have similar
> problem to what you had last Oct. I would very much appreciate it if
> someone could give me a hint.  Below is a brief description of my system
> setting and what I did in attempt to achieve stereo effect.
> 
> =======
> Setting
> =======
> Linux with nVidia Quadro graphics card (in Clone mode, stereo 4). The two
> outputs of the graphics card are connected to two monitors (later will be
> two polarized projectors)
> 
> ==========
> What I did
> ==========
> Add
> renWin StereoCapableWindowOn
>   renWin SetStereoTypeToCrystalEyes
> right after
> vtkRenderWindow renWin
> in Examples/Tutorial/Step5/Tcl/Cone5.tcl.
> 
> Run it, hit key "3", then I got error message, saying "Adjusting stereo
> mode on a window that does not support stereo type CrystalEyes is not
> possible". As a result, I did't see any disparity between the left and
> right renderings (they are identical). I suspect that the window failed to
> configured itself to be stereo capable as I request.
> 
> Many thanks in advance.
> 
> Weiguang
> 
>