CLIPLINE3D Clip a line with a box and return an edge.

   EDGE = clipLine3d(LINE, BOX);
   Clips the line LINE with the bounds given in BOX, and returns the
   corresponding edge. 

   If the line lies totally outside of the box, returns a 1-by-6 row array
   containing only NaN's.

   If LINE is a N-by-6 array, with one line by row, returns the clipped
   edge coresponding to each line in a N-by-6 array.

   See also:
   lines3d, edges3d, createLine3d, clipRay3d

Package: matgeom