tion vector ( 0, 1, 1 ).  We wish to find the 
       closest point on the line to the point ( -6, 9, 10 ).  We 
       can use the code fragment 
 
          #include &quot;SpiceUsr.h&quot;
               .
               .
               .
          LINPT[0]   =  1.0; 
          LINPT[1]   =  2.0; 
          LINPT[2]   =  3.0; 
 
          LINDIR[0]  =  0.0; 
          LINDIR[1]  =  1.0; 
          LINDIR[2]  =  1.0; 
 
          POINT[0]   = -6.0; 
          POINT[1]   =  9.0; 
          POINT[2]   = 10.