The -Y switch
-  Suppresses the creation of
  Steiner points on the exterior
  boundary.  Interior Steiner points may still be created.
-  This switch is useful when the mesh boundary must be preserved so that
  it conforms to some adjacent mesh.
-  Specify this switch twice (`-YY') to prevent all segment splitting,
  including interior boundaries.
-  Be forewarned that you will probably sacrifice some of the quality of
  the mesh; Triangle will try, but the resulting mesh may contain triangles
  of poor aspect ratio.  Works well if all the boundary vertices are closely
  spaced.
-  Be forewarned that the -Y switch can prevent the -D switch from
  yielding a triangulation
  that is conforming Delaunay.
-  This switch will not disable the -s switch; if you don't want
  vertices inserted on the boundary, use -Y and don't use -s.
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