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Render whole terrain w/ Parallax Mapping

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This thought has occured to me before, but I am wondering: has anyone ever tried to render an entire terrain using only parallax occlusion mapping (or some other form of steep parallax)? What I mean is, send a flat piece of geometry with a good heightmap and normal map, and then do a massive occlusion mapping shader? Obviously there are many issues, like clipping terrain edges to the sky, writing to z-buffer, performance, etc.

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