Hi Mikhail,
osgTerrain::TerrainTile can be used to render height fields.
I don't want any special rendering for my depth maps. I also have regular 
polygonal 3D models and I need to convert depth maps to the same polygonal 
models.
osgTerrain will create regular polygonal models while maintaining a relatively good performance. I don't see where this is special. You should give it a try, it is really easy to set up. I used it in some experimental game engine, where the user could load the terrain from a height map (which essentially is a depth map as you figured out ;-))

Cheers
Sebastian


Thank you!

Cheers,
Mikhail

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