//Here is two ideas that could be refined:

#local  P =
text {
   ttf
   "courbd.ttf",
   "P",
   2,
   0
};

intersection {

         object {
                 P
                 texture { pigment { White } }

         }
         object {
                 P
                 texture { pigment { Red } }
                 translate <.001,.001,.001>
         }
}

//or:

#local Mx = max_extent ( P );
#local Mn = min_extent ( P );

intersection {

         object {
                 P
                 texture { pigment { Red } }

         }
         box {
               Mn,
               <Mx.x,Mx.y-.001,Mx.z>
               texture { pigment { White } }
         }
         translate x*1
}

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