with sky spheres make sure you make them a negative size or you won't be able to see them from the inside... then to make the world seem endless and you're game to still run fast try something like...
make object sphere [obj number],-1000
texture object [obj number],[texture number]
fog on
color fog rgb([red],[green],[blue])
fog distance 950
set camera range 0,1100
...make sure at the end of every Loop the sphere is positioned at the camera position... and change the numbers as much as you need to to get it to work for you're game...hope this helps...
Anyone Can Destroy...But Few Can Create...