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Saving cubemaps to disk

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I am using cubemap "probes" in my game, to provide pre-computed specular reflections and local ambient lighting. When a level is loaded, the probes will render small cubemaps from their positions, which are then processed by ATI's CubeMapGen lib (to generate seamless blurred mip-maps). It works fine, but I want to compress my cubemaps using DXT5, by caching them as DDS files. Do I need to save each cubemap face in a separate DDS file or is there a way to save straight to DDS? I can't find an equivalent of D3DXSaveTextureToFile for cube textures.

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