Portals and BSP's are pointless if you don't have a first person camera ( or close to ) because there's nothing to occlude. Top down, 3/4 cameras, anything like that and you're rendering everything within the frustum so any time you spend calculating vis is time wasted. So you'll generally find that in engines which try to force you to make one type of game. Just like Torque, perfect example.
Having downloaded and taken a quick look at this, as far as I can tell, all the good stuff has to be written yourself using custom shaders. There are some included shader effects but only a couple are impressive.
Also, I tend to agree with Mike, now that I've looked a little more. I don't see any point using this with C++, Blitz3d or BlitzMax. If you want to use it, script it in Python. It's really been designed assuming you will and I have a feeling you'll be trying to force a square peg into a round hole if you try to go another way with it.
Having downloaded and taken a quick look at this, as far as I can tell, all the good stuff has to be written yourself using custom shaders. There are some included shader effects but only a couple are impressive.
Also, I tend to agree with Mike, now that I've looked a little more. I don't see any point using this with C++, Blitz3d or BlitzMax. If you want to use it, script it in Python. It's really been designed assuming you will and I have a feeling you'll be trying to force a square peg into a round hole if you try to go another way with it.