From KruelWiki

NB: This relates to Praelium v2, so its very fluid and just something to think about for now!

Options

BSP

In reading the Ogre wiki, it seems BSP isn't a totally cleared and legal format for us to be using. Advice on IRC is the format is too out of date to be used by any serious project.

Custom

We could make our own custom format, compiled from something easily exported such as DXF.