[osg-users] fix the gap between terrain tile

[MingWei]

Hi Every One!
  I'm working on the 3D terrain visualization. I want to split the Terrain Image into many tiles. And then build their LODs( like Quad tree ). Now I don't konw how to fix the gap between adjacent tile( in the same and different LOD level ).
  I 'm long for your suggest.
  Thanks!
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