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ovPlanet / Direct3D precision

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I just learned about ovPlanet. I want to experiment with it, but at first glance, it looks like it only spits out vertex data in double precision. I believe that DX10 supports double precision values, but my laptop is limited to DX9. I looked at ovPlanet's forums, and they are stone empty. Does anyone know if ovPlanet can be told to provide single precision float values? If not, am I forced to convert so many double position, normal and txcoord values to float before rendering each frame? This will be detrimental on the framerate, won't it? Any advice to help me overcome this obstacle would be greatly appreciated.

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