Thank you for your replies.

@Alexandre: I don't want to move the camera, I only need an overlay of the 
current object on top of the screen.

@Robert: This is not at all what I'd like to have. I think, when I implement it 
in the way you suggest it, the flight object will always be on top. But it 
should also stay in the scene on the given position.

What I have done till now is a second camera for a HUD, which contains 
additional draw objects (like quads, circles, triangles). These object are free 
in position on the 2d screen. Now I want one of these objects to overlay always 
the flight object. These objects shoud stay fixed in their size on the screen, 
indepent of the current zoom level. So it could happen that the overlay objects 
only overlays parts of the flight object or the entire object. 

Another requirement of this, is to show the position of the flight object when 
it's not on the current viewed clip (/scene). So when the flight object moves 
out of the current screen the overlay should stay on the border of the screen 
and show the position of the flight object, so that the user knows where to 
find the specific object.

I hope it's now more understandable.

Thank you!

Hen

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=55778#55778





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