:) I think you misunderstood me. I have been searching all forum.

The terrain (is not whole earth) database was created correctly using osgdem 
with Terrain and geocentric parameters. Also camera position is computed 
correctly and I can easily track may object using orbit manipulator. But, If I 
use object transformation in ECEF coordinate system, My object does not move 
smoothly. It moves up and down little bit.

If I use local coordinates that are converted from lats/long/height according 
to an origin point, object moves correctly. 

Also I am not using delta3d directly and the problem is not related to 
GeoCoordinate. 

If I transform terrain or root scene to this origin point, how can I calculate 
object transformation without terrain-object correlation problem ?

Regards.

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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=52417#52417





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