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Geometry Clipmaps / R2VB

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Has anyone here attempted to implement Geometry Clipmaps with ATI's R2VB feature? Reason I ask is that I'm looking at the GPU Gems 2 article on using vertex textures with geo-clipmaps and it looks to be quite a good way to offload the CPU of terrain calculations. This is great, but my X1900 won't let me to vertex shader texture lookups. ATI have pushed R2VB as an alternative, but I can't see how it would speed up the rendering here at all unless doing synthesis for finer levels than you have data for, in which case the pixel shaders could do the calculations? I'd also be interested in what others have used to compress the heightmap data in main memory with? Marco

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R2VB is 3 - 5 times faster than a vertex texture fetch. As far as I know also NVIDIA exposes now R2B ... at least it is possible with DX10.
Other than this both should provide the same functionality.

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