Simple answer, use a translation of your stars object which matches
your camera position. If all your moving is the x then like:
 #declare XposCamStars=clock*Distance and use that for the x value in
both camera and stars object translation vectors.
Sorry if I'm repeating others answers, I'm offline.

Bob

Chuck Roberts <rob### [at] accnorg> wrote in message
news:37C57242.1F2FD0F3@accn.org...
> I want to do an animation where I fly past the planets. How do I
make a
> background of stars, where the stars won't move while I fly along
the
> positive Z axis?

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