[Paraview-developers] Paraview 3.98 Heatracking problem

[Emiliano Pastorelli]

Il 11/01/13 19:40, Aashish Chaudhary ha scritto:
>
>
> On Fri, Jan 11, 2013 at 7:39 AM, hogan <emiliano.pastorelli at gmail.com 
> <mailto:emiliano.pastorelli at gmail.com>> wrote:
>
>     Hi All,
>
>     I just wrote a vrpn server for a magnetic tracker (WintrackerIII)
>     and I was
>     trying to use it in a paraview 3 walls Cave test-setup, but so far
>     without
>     any success.
>
>     The only two parameters that i successfully manage to configure
>     through the
>     GUI and state file of the VRPlugin are EyeTransformMatrix and
>     ModelTransformMatrix.
>
>     From what I see (my test environment is definitely small, just 3
>     monitor
>     assembled so one is the table and two other ones are two connected
>     walls,
>     bigger one ready before the end of the month), the EyeTransformMatrix
>     doesn't seem to be enough to represent the movement of the user
>     (or am i
>     wrong and the problem is just related to the fact that my
>     test-system is so
>     small and i can't really explore the movement feeling?
>
>     I tried to attach the tracker to other values like CameraPosition or
>     ViewPosition that sounded somehow logical but i get warnings and
>     errors and
>     it doesn't work.
>
>
> Hogan,
>
> The tracker sensor should be attached to the EyeTransformMatrix if you 
> want head tracking for your system. Couple of questions:
>
> 1. What version of ParaView are you using?
> 2. Can you share your State and PVX file with me?
> 3. What are the units of your tracker?
>
> We should be able to resolve the issue.
>
> Thanks,
>
> Hi Aashish,
I'm using ParaView3.98 RC1 and the in the vrpn server i converted the 
units in meters as for the vrpn standard, so i guess they should somehow 
be the right ones.
Tomorrow from the office I can send you the PVX and the state files, now 
I don't have them available.

My feeling while testing on the test-system is that the headtracking 
lets me change the position of the head a bit around the object, but 
that I don't achieve a full movement. So for example, if i stand in 
front of the receiver and then i move on top of it (towards -Z), i don't 
see the object from above (or in the table-screen as i would expect), 
but i see a upper-front perspective only, like if the transform matrix 
of the view cone was changed, but somehow not the position of the user.

It might be just a wrong feeling given by the small system or maybe the 
positioning of the object, but at least this far it doesn't give at all 
the proper immersive feeling.

As a side question still related to my system, i noticed the anaglyph 
stereo goes completely wrong in the screens, while it is correct (and 
completely different) in the control display, any suggestion on that? 
(soon i'll have to switch to paired projectors and passive stereo, so i 
would like to avoid the same problem there).

Btw, tomorrow I'll send you the files and a sample of the data I get 
from the tracker.
Thanks again for your time!

Best,
H

>
>
>     Any help would be welcome,
>     Best
>     H
>
>
>
>     --
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>     list archive at Nabble.com.
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>
>
>
> -- 
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com <http://www.kitware.com> 

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