  pnear      O   Nearest point on the line to point. 
   dist       O   Distance between point and pnear. 
 </PRE>
<h4><a name="Detailed_Input">Detailed_Input</a></h4>
<PRE>
 
   linpt 
   lindir         are, respectively, a point and a direction vector 
                  that define a line in 3-dimensional space.  The 
                  line is the set of points 
 
                     linpt   +   t * lindir 
 
                  where t is any real number. 
 
   point          is a point in 3-dimensional s