The editor exports each object and brush surface separately, so you can maintain control over it in your own program. If you want just simple and fast rendering, use LoadMesh(). If you want to go through the map and find entities and special objects, use LoadAnimMesh(). If you wish, you can always use AddMesh() to collapse the mesh into single surfaces, whichever way you choose to divide the map up.
Blitz3D doesn't really support any visibility or bsp method. You can export to .map, which can be compiled in a bsp compiler, but it would probably be more trouble than it was worth.
Blitz3D doesn't really support any visibility or bsp method. You can export to .map, which can be compiled in a bsp compiler, but it would probably be more trouble than it was worth.