2013

The lowest level of smoothness, or baseline, is 0. By default, Level 0 has no
smoothness. You can increase the smoothness of any mesh object up to the
current limits. However, you cannot decrease the smoothness of a mesh object
whose level of smoothness is zero.
If you have added creases to a mesh object, the effect of smoothing differs,
depending on the crease setting. The effect of creases added to mesh that has
no smoothness (Level 0) is not apparent until the mesh is smoothed.
As you edit an object using gizmos or grips, you might create gaps in the mesh
object. One way to close the gap is to smooth the object or refine individual
subobjects.
Limit Mesh Density
Mesh is created at the level of smoothness that you specify. The smoothness
can range from None (0), to the default maximum (6), or to a level that you
specify. As an object is smoothed, the density of the mesh facet grid also
increases. For best results, model mesh objects at lower smoothness levels and
increase the smoothness only after modeling is complete.
Modify 3D Models | 459