Use these settings to specify how mesh smoothing affects editable poly and Edit Poly objects.
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Select an Edit Poly or editable poly object. >
Modify panel > Polygon sub-object level > Edit Geometry rollout > MSmooth > 
(Settings)
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Select an Edit Poly or editable poly object. > ribbon > Modeling tab > Polygon Modeling panel >
(Polygon) sub-object level > Subdivision panel > Shift+click 
(MSmooth [MeshSmooth]) or choose MeshSmooth Settings from the drop-down list.
Interface
MeshSmooth Selection uses the caddy interface when Enable Caddy Controls is on; when off, the standard settings dialog is used. For details on using the caddy controls, see The Caddy Interface.
Left: the caddy interface; Right: the standard dialog
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Smoothness -
Determines how sharp a corner must be before polygons are added to smooth it. Smoothness is calculated as the average angle of all edges connected to a vertex. A value of 0.0 prevents the creation of any polygons. A value of 1.0 adds polygons to all vertices even if they lie on a plane.
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Separate by Smoothing Groups -
Prevents the creation of new polygons at edges between polygons that don't share at least one smoothing group.
- Separate by Materials
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Prevents the creation of new polygons for edges between polygons that do not share Material IDs.
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OK -
Applies the settings to the current selection and closes the caddy. Keyboard equivalent: Enter
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Apply and Continue -
Applies the settings to the current selection, retaining them for the preview if you then change the selection. Keyboard equivalent: Ctrl+Enter
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Cancel -
Closes the caddy without applying the settings to the current selection. Does not reverse previous uses of Apply And Continue. Keyboard equivalent: Esc