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Terrain LOD in hardware using shaders

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I''m posting here in reference to this old but lengthy thread, rather than digging it up with a reply. Basically, has anyone looked anymore into this method as opposed to the more popular methods such as ROAM? Are there any new results on its pros and cons? It almost seems too good to be true, and makes me wonder why everyone doesn''t use it. Does it even work at all with terrain patching, or does the whole concept require the full terrain grid to be in video memory at once?

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