[osg-users] placing image on scene

[Bryan Berg]

Hi,

 

So I figured out how to add an image on a specific location of the screen,
and keep it at the same size like a placemark.

 

So even if the user zooms in and out of the scene, the image remains the
same size.

 

But I need a way to only show it when a specific point of the scene is
visible.

 

So my question is: how can I take a specific point of the scene and than 

 

            a)determine if it is to be viewed

 

            b)if so, which window coordinate it corresponds to

 

Thanks !

 

-Bryan

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