3DStudio Skyboxes        

I found this nice bit of info in the API Documentation under Ogre::TextureUnitState::setCubicTextureName, so i thought it should be here in the wiki also.

Cubic textures are made up of 6 separate texture images. Each one of these is an orthoganal view of the world with a FOV of 90 degrees and an aspect ratio of 1:1. You can generate these from 3D Studio by rendering a scene to a reflection map of a transparent cube and saving the output files.