Interesant format load all scene in only one line of code.
Tools for edit this formats GEditPro 0.7 with source in
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There is a partial BSP support with the GLFreeForm/GLActor
objects. Try including GLFileBSP in the uses clause and load
the BSP file with GLFreeForm.LoadFromFiler
Sorry, that unit to include in the uses clause is GLFileQ3BSP
(for Quake3 BSP format).