a db primitive is ok, just remember to
set object cull objnum,0 (in pro)
or
make object sphere 1,-200 (in classic or pro)
the first command allows you to see the back face of surfaces that face away from you, the second (negative object size) has the same effect (turns the object inside out...like a sock, you get the inside on the outside and vice-versa), you could also use the set object command but both of the above are less trouble.
Mentor.
ps: when you get to using collision don`t forget to set the object collision off for the sphere you have used for the sky, since you are inside it you are colliding with it all the time, if you leave it`s collision on then results will not be what you expected.
PC1: P4 hyperthreading 3ghz, 1gig mem, 2x160gig hd`s, Nvidia FX5900 gfx, 6 way surround sound, PC2: AMD 1.2ghz, 512mb ram, FX5200 ultra gfx, stereo 16 bit soundblaster, ups.