[Paraview] Possible Bugs in CAVE mode??

[Aashish Chaudhary]

Looks like  you missed "reply all"

On Tue, Feb 14, 2012 at 10:00 AM, Stephan Rogge <Stephan.Rogge at tu-cottbus.de
> wrote:

> **
>
> Hello,
>
> @Aashish: Yes. To override it with a state file makes a lot sense to me. J
>
Great, hopefully soon. We will update you regarding this.

 My question is not to have direct access on the eye angle but whether
it isconsidered
in the future during off center projection computation.

> We both had a discussion here in the mailing list relating head tracked
> projection computation. Since this time I was able to get some practical
> experiences and saw, that I really need a way to control the convergence
> in stereo mode. Especially when objects came out of screen it is strange to
> focus on those objects when my convergence point lies in infinity. To workaroundit would be great to usee.g.the 3D focal point and apply
> the angle automatically in respect to the head position. The current
> computation implementation uses an parallel approach.
>
I see what you are saying. Most of the implementations of stereo would
ignore eye angle. Do you have any technical documentation on this? Also I
cc'd Bill. I will follow up with you in another email (offline). Not sure
if we can get this done in our current funding (most likely not) but at
least we can have a quick discussion.

> @Nikhil: That‘s sounds great. J
>
> Thank you very much for your quick response.
>
Thanks for trying our latest code!


> Regards
>
> Stephan
>
> *****Von:* Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com<aashish.chaudhary at kitware.com>
> ]
> *****Gesendet:* Dienstag, 14. Februar 2012 15:26
> ***An:* Stephan Rogge
> ***Cc:* Nikhil Shetty; paraview at paraview.org
> ***Betreff:* Re: [Paraview] Possible Bugs in CAVE mode??
>
>  Hi Stephan,
>
> On Tue, Feb 14, 2012 at 9:17 AM, Stephan Rogge <*
> Stephan.Rogge at tu-cottbus.de* <Stephan.Rogge at tu-cottbus.de>> wrote:
>
> Hi,
>
> yeah. It does help. But honestly I do have some doubts that this is the
> best
> way to provide eye separation control. Since PVX is
> used only at startup this parameter is fixed and all PV scenes running with
> that configuration have to use it. In my case I use
> different scenes with different scales (cm or m). I cannot provide one eye
> separation for all scenes.
>
> True. We talked about it. I guess we can provide an option to override,
> meaning if you have it in state file, it will be used and if not it will
> fall back to pvx and finally to default. Does this sounds reasonable?
>
> And to use one
> configuration file for each scale of scenes feels very cumbersome. In my
> opinion the state file is a better place for that
> parameter.
>
> BTW: Is it planned to modify OffCenterProjection computation to consider
> the
> eye angle?
>
>
>
> No. Eye Angle is used for a different method for calculating projection.
> But I am curious, how would you like to use eye angle?
>
>
> Best regards,
> Stephan
>
> Von: Nikhil Shetty [mailto:*nikhil.shetty at kitware.com*<nikhil.shetty at kitware.com>
> ]
> Gesendet: Dienstag, 14. Februar 2012 14:55
> An: Stephan Rogge
> Cc: *paraview at paraview.org* <paraview at paraview.org>
> Betreff: Re: [Paraview] Possible Bugs in CAVE mode??
>
>
> Hi Stephan,
>
> There was a slight change in that we can now specify eye separation in the
> pvx configuration file. You can set the eye seperation as.
>
> <pvx>
>  <Process Type="client" />
>   <Process Type="server">
>   <EyeSeparation Value="0.065"/>
>  <Machine Name="Front"
> .....
>
> Hope this helps
>
> Regards
> -Nikhil
>
> On Tue, Feb 14, 2012 at 8:48 AM, Stephan Rogge <*
> Stephan.Rogge at tu-cottbus.de* <Stephan.Rogge at tu-cottbus.de>>
> wrote:
> Hello (again),
>
> regarding the cave stereo issue I was able to put an debug message into the
> vtkCamera and noticed that EyeSeparation is an incredibly small value
> (1E-332).
>  It seems that somewhere the eye separation value is lost which results in
> two
> identical projection matrix and this yields a monocular vision. That would
> explain why stereo is not working....
>
> @Nikhil, if I get you right, you are involved in the VR development of PV?
>
> Thanks,
> Stephan
>
>
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>
>  --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | *www.kitware.com* <http://www.kitware.com>
>



-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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