Hi!
What you are ending with is something like this:
object{union{sphere {0,0}
sphere {0,0}
}
union{sphere {0,0}
sphere{0,0}
}
}
and Pov does not take it, because you have not one object in the
object{}-statement, but several.
If you enclose the while()-loop of fachwand() in another union, everything
should work okay, 'cause you get one union in the object statement.
Hth,
Marc-Hendrik
