well i didnt post my specifics because i didnt want to confuse the question...

If you remember my huge campground level, it doesnt have a hollow block surrounding it. We want to temporarily change to polygon collision and then back to the 'normal' collision in game. But we'd need a hollow block.

Since it was only needed for a small area, the hope was to have a prebuilt entity, and move it to surround the area in question, then away again when not needed anymore.

I didnt want to surround the whole level since I had framerate issues before ( a year ago ) As it turns out, i just tried a huge hollow block again, and the framerate hit wasnt so bad anymore.

BUT I think this is still an interesting question that bears some investigation!

And still on topic, would you explain the sky cube idea further? I'm using a dome shaped model for the sky, and simple terrain for the ground. this blocks my view of the hollow block, is this the same idea? Every bit of frame rate help I sure could use! (Build time for my whole campground level is now 3 seconds )

Thanks bunches!

Jason