thanks Christopher, you made it clear to me.

i was complaining about the macro, working on itsself, but not working when
called in an object.
so the macro renders without errors, but called in an object it gives error.

thanks to you all!


//code is now:
#macro Fence(Flength, Fheight, Fspace, Fdiam)

   union{
   #local I=0;
   #while(I< Flength/Fspace+1 )
         cylinder{
            <0,0,0> <0,Fheight,0> Fdiam/2
            translate <I*Fspace, 0, 0>
            }
      #local I=I+1;
   #end
   }

#end

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