Can you please suggest some good opengl terrain rendering links or books(not to complicated, i am quite a beginner yet). Thanks in advance.

Thanks hawash for the useful site. But the problem is in the free books i haven't found anything on this matter :(

Start with http://www.vterrain.org/
There you`ll find plethora tutorials/links.

What you want to start with is reading a heightmap (terrain data) from the file (ideally, 8-bit heightmap for a start), generating 3d mesh from it and displaying it.

Start with some some simple 256x256 heightmap (can be an image file - 256 shades of grey - where white represent highest peak of terrain and black represents lowest one).

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