[vtkusers] Text annotations in 3D window

[Wayne Christopher]

I would like to place text annotations at specific 3D points.  I can do 
this using vtkVectorText and vtkFollower, but the text appears with a 
specific size and orientation in 3D so when I move the camera it can be 
hard to read.  I would like the text to always be N pixels high and 
oriented correctly in the plane of the screen, but have its position 
fixed to a specific 3D location.  Are there any examples of this?    Thanks,

     Wayne