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Terrain/Mesh LOD


i was working on some terrain using it for a large area. Now i cutted my terrain into pieces of
500x500 pixel heightmaps to render them more effiicient. To get most performance i just need
to implement any kind of LOD algorithm. First i dont want to use shaders but opperate by myselfe
on the cpu.

What is the best LOD to take for my terrain and for any other mesh?
Does anyone has an example implementation so that i could play arround with it?

Thank you!