// calculate the length of a spline
#macro Len_Spline(Espl begin_at stop_at num)
   #local c = 1/num;
   #local V1 = Espl(begin_at);
   #local result = 0;
   #while (c <= 1)
      #local V2 = Espl( c*(stop_at - begin_at) + begin_at);
      #local result = result + vlength(V2-V1);
      #local V1 = V2;
      #local c = c + 1/num;
   #end
   (result)
#end

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