Hi Thomas,
Thomas Kulessa wrote:
> Hi list,
>
> following mostly
> http://www.mail-archive.com/[email protected]/msg05374.html
> I try to set up a cluster with one client and six servers. I have 2
> adjacent wall projections and 2x2 adjacent floor projections in front of
> the wall. Something like 1/3 of a CAVE.
> If I understand the above mentioned post right, one way to achieve it,
> is to create 6 MatrixCameraDecorators and 6 Viewports, add one camera to
> one viewport and finally add the six viewports to the
> MultiDisplayWindow.
Close. You need to add the camera to all the decorators, or they won't know
what
to do. And you need to remove the original viewport, or there will be some
overlap.
> Then I can manipulate the PostView matrices of each
> Decorator and so the content of each server window.
The alternative to using the MatrixDeco is to use the ProjectionCameraDeco,
which knows a lot more about asymmetric viewing frustra and Caves. But if
you're
ok with calculating all the matrices yourself that's fine, too.
> Unfortunatly this
> doesn't work. The application behaves exactly as before with only one
> viewport and one camera (besides a powered by OpenSG logo that somehow
> appeared)
That sounds like something basic is wrong.The logo only appears when you tell
the SSM to show it.
> , all windows/viewports are horizontally aligned.
> Im also not sure if i understand the whole concept of Decorators,
For a basic description see http://en.wikipedia.org/wiki/Decorator_pattern .
The
Decorator looks like a Camera (and can be added to a Viewport), and it uses
another Camera underneath, but it changes the behavior somewhat.
> 1. Do I need a beacon for each camera? Or just one? Or none? I mean,
> whats the sense of the matrix decorator? Just for the easy access to the
> matrices? Couldn't do the same with the beacons transform core?
The main reason for the decorator is to be able to use the same camera for all
the different views that you need. The idea is to have one Camera (and
therefore
one beacon), and insert a Decorator between it and the actual Viewport.
> 2. How does the MultiDisplayWindow know, which server belongs to which
> viewport? Simply by order?
Yes.
> Does it know how to transform the matrices in
> the right way, when the Navigator changes position? (Since it is
> associated with just one viewport and one beacon.)
That's what the Decorators are for.
Hope it helps
Dirk
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