Source PostScript (ligne3d.pps)

%% [tableau de points3d] option --> trace la ligne brisee
/ligne3d { 
1 dict begin
   dup isstring
      {/option exch def}
   if
   tab3dto2d
   currentdict /option known
      {option}
   if
   ligne
end
} def

%% [tableau de points3d] option --> trace la ligne brisee
/ligne3d_ { 
1 dict begin
   dup isstring
      {/option exch def}
   if
   tab3dto2d
   currentdict /option known
      {option}
   if
   ligne_
end
} def