Thanks to everyone for hempling me;  specially to Ken for the smaple code.  It solved
the problem.




Ken wrote:

> // This should now act correctly for a merge csg operation:
>  #declare cnt=0
>         merge {
>  #while (cnt < 5)
>         object {ball
>                 translate <cnt/2.5,0,0>
>                }
>         #declare cnt=cnt+1
>  #end
> }

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