[Paraview] VRPN Setup

[Sean Delaney]

Hi Aashish,

Thanks for your comments. To my knowledge, there is no reason why the eye
separation must be specified in the same units as the raw tracking data.
Paraview never uses my tracking data in its raw state. The tracking data is
transformed to my chosen "world" coordinates before it is used for
graphical calculations. These "world coordinates" are the ones in which my
screen geometry is defined. I believe that the eye separation should be
defined in these "world" coordinates.

I agree that the scene should be scaled to fit the world coordinates, and
then the eye separation will fit automatically.

In practice, it doesn't matter whether Paraview requires the eye separation
to be specified in tracker units or world units because the two are related
by a fixed scale factor. Users simply need to know which units Paraview
expects. In my opinion, it's simpler if everything is defined in world
coordinates. Of course, many users use the same units as the tracker for
their world coordinates, in which case, the point is moot.

Would you agree with the above? Or have I perhaps overlooked something? I'm
not coming from a graphics background, so I may have misunderstood
something.

Seán





On Tue, Jul 24, 2012 at 2:29 PM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> Hi Sean,
>
> >>
> >> By the way, I may have found a bug / feature. It seems like I have to
> >> specify the eye separation value in mm, even though I have transformed
> my
> >> tracker units to metres in the state file. Perhaps this is another
> mistake
> >> in my configuration though. Please let me know if that's the case.
>
> If you tracker data is in meters, you should keep the eye separation
> in meters too. In general I keep the eye separation to 0.06 meters (6
> centimeters). Now if your object is tiny, you may feel like too much
> eye separation because now the object has to be really close to your
> eyes and hence larger eye separation. I would recommend that you scale
> you scene (objects) appropriately (to make them of a particular size
> in terms of bounds).
>
> Hope this helps.
>
> Thanks,
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