Flat circle?

Is it possible to make a sphere so big that it is flat kinda like earth? and is it possible to only make a small portion of the sphere visible instead of drawing the whole thing.

I learned in tutorials how jme renders so fast. but could i render half an object or less?

So is this where building your own Game come in?

Becuase i bet i would have a nice chance of making it from pure code in vb6

if you want the earth in real size you need some kind of automatic terrain(space) block system, since 32bit is "kinda" limited to something like 2000km x 2000km depending on needed accuracy.