I create a line on the terrain using overlayNode, all looks fine. Then, I add a 
EphemerisModel to the scene to create some environment effect. 

After that, rotate camera is fine, but when I move camera(w a s d), the line I 
created moves on the terrain surface!

confusing,     ~ @_@ ~

scene graph is like:

                   root
                   /    \
  (line)overlay    EphemerisModel
               |
          terrain

I attached a viceo clip to present my problem: a overlayNode red line on 
terrain -> rotate camera(fine) -> move camera(ouch~)

In the video, you can notice a blue object in center of screen, under the 
terrain, which comes with EphemerisModel, I don't know what it is, but it 
behaves the same as my red line when I change camera

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=46760#46760




Attachments: 
http://forum.openscenegraph.org//files/videoclip_357.rar


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