[Paraview] HeadTracking in ParaView CAVE

Wed Jan 30 14:35:00 EST 2013

Hi Aashish,

yes, vrpn and vrui are configured and set apparently in the right way 
(for another application i'm using vrpn to track for paraview, and also 
for a meshviewer based on vrui, through a vrui devicedaemon, so 
apparently they are working both in the proper way).

After I compiled the new version of paraview with the vrplugin fix, when 
i load the vrplugin, in the GUI, the menu to select the type of 
connection (the upper one after you choose to add a connection VRPN or 
VRUI) is empty, and therefore i can't select any of them. And if I try 
to load a state file with the proper connection (i'm using a vrpn server 
at the moment), it doesn't load.

About the inversion of coordinates, i solved, it's the tracker, and i 
fixed that externally. Today i achieved to use paraview on a 
demonstration on two screens with passive stereo and the result was 
definitely perfect in the way is was moving (but i'm still loading the 
VRplugin from an older paraview, not from this last one).

Best,
Emiliano

Il 30/01/13 20:50, Aashish Chaudhary ha scritto:
> Hi Emiliano,
>
> On Tue, Jan 29, 2013 at 1:07 PM, Emiliano Pastorelli
> <hogancito at gmail.com> wrote:
>> Hi Aashish, today i installed the master ParaView as you suggested.
>>
>> There is something wrong with the GUI for the VRPlugin, and now it's not
>> possible to select anymore the type of the VR connection, not even importing
>> a state file.
> Did you compile with VRPN / VRUI ON? I am not sure if understood the
> problem here.
>
>   I solved that importing an older version of the plugin, with
>> that it works, but so i don't know it the problems are fixed. (it took me a
>> while to figure how to use the new FullScreen option but then i managed, i
>> was trying to put it in the Server process)
> We can put that in the sample VR file.
>
>> Now somehow once in a while, even after applying the right transform matrix
>> to the tracker data, i have the weird effect that once in a while, the axis
>> seem to randomly invert. So if until a second before it was working fine
>> with the headtracking around an object, suddenly it gets wrong on all the
>> four axis. I don't know if it might be a problem of my tracker or is
>> something in paraview.
> I would believe that could be the problem on your tracker (depending
> on how stable your tracker is).
>
>> As a test, I saved a working system state, went out of paraview and when i
>> restarted and restored the state, the axis were wrong again.
>>
>> As a side effect, there is a XGrabKeyboard command to remove in the vtk file
>> vtkXOpenGLRenderWindow.cxx and if you don't remove it, when paraview is
>> running fullscreen you can't use the keyboard anymore, nor in paraview nor
>> in other applications.
> This is something that came before. We will push a fix.
>
> Thanks
>
>> Best,
>> Emiliano
>>
>> Il 28/01/13 23:43, Aashish Chaudhary ha scritto:
>>
>> On Mon, Jan 28, 2013 at 4:19 PM, Emiliano Pastorelli <hogancito at gmail.com>
>> wrote:
>>
>>> Hi Aashish, perfect, thank you very much! I'll give it a try tomorrow, and
>>> if it all works well i'll use it for a demonstration on wednesday, just in
>>> time!
>>
>> Great. Let us know if we can help.
>>
>> Thanks,
>>
>>>
>>> Regards,
>>> Emiliano
>>>
>>> Il 28/01/13 22:15, Aashish Chaudhary ha scritto:
>>>
>>> Hi Emiliano,
>>>
>>> I just wanted to let you know that recently we fixed couple of minor bugs
>>> and now they are in ParaView master if you want to give it a try.
>>>
>>> Thanks
>>>
>>>
>>> On Fri, Jan 11, 2013 at 12:47 PM, Aashish Chaudhary
>>> <aashish.chaudhary at kitware.com> wrote:
>>>>
>>>>
>>>> On Thu, Jan 10, 2013 at 9:00 AM, Emiliano Pastorelli
>>>> <hogancito at gmail.com> wrote:
>>>>> Hi,
>>>>>
>>>>> I'm having some issues with headtracking in ParaView in a 3 screens
>>>>> environment (2 walls + 1 table). From the GUI (and also from the config pvsm
>>>>> file, but equal results) I tried to configure the following propertier
>>>>> connected to the tracker.
>>>>>
>>>>> a) Camera Position ( I mentioned it in a previous message), the vrpn
>>>>> server doesn't seem to feed the proper argument to the SetCamera function
>>>>> and so it doesn't work.
>>>>> b) View Position : when i start the vrplugin it gives me the following
>>>>> message :
>>>>> Generic Warning: In
>>>>> /home/hogan/projects/ParaView/ParaViewCore/ServerManager/Core/vtkSMPropertyHelper.cxx,
>>>>> line 429
>>>>> Call not supported for the current property type.
>>>>> And nothing happens.
>>>>> c) EyeTransformMatrix : close to be working, but when i move my head
>>>>> around the screens, the object doesn't move properly around the screens
>>>>> (while if i just move the object with the mouse, it goes properly across the
>>>>> three display, moving from one to another according to the position)
>>>>> d) ModelTransformMatrix : works properly
>>>>>
>>>>> Which is the "official" procedure to do the headtracking? Am I doing
>>>>> something wrong? The fact that it works properly with the
>>>>> ModelTransformMatrix makes me think that the vrpn server that i wrote for
>>>>> this tracker works properly, so i don't get what else i shall modify to
>>>>> properly track the head movement.
>>>>
>>>> Connecting your sensor to the EyeTransformMatix is the right thing to do
>>>> for the head tracking. Is it possible that your numbers are too small? When
>>>> you move your head the position of the object may not move that much
>>>> depending on your object is front of the projected plane or behind. If you
>>>> can send me your config file, state file and what values you are getting
>>>> from your sensor, I can provide you exact explanation.
>>>>
>>>> Thanks,
>>>>
>>>>
>>>>> Any hint is welcome before i go mad!
>>>>> Best,
>>>>> Emiliano
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>>>>
>>>>
>>>>
>>>> --
>>>> | Aashish Chaudhary
>>>> | R&D Engineer
>>>> | Kitware Inc.
>>>> | www.kitware.com
>>>
>>>
>>>
>>> --
>>> | Aashish Chaudhary
>>> | R&D Engineer
>>> | Kitware Inc.
>>> | www.kitware.com
>>>
>>>
>>
>>
>> --
>> | Aashish Chaudhary
>> | R&D Engineer
>> | Kitware Inc.
>> | www.kitware.com
>>
>>
>
>