Command entry:Select an Edit Poly or editable poly object.

Modify panel

Polygon sub-object level

Edit Geometry rollout

MSmooth

(Settings)
Command entry:Select an Edit Poly or editable poly object.

Modeling ribbon

Graphite Modeling Tools tab

Polygon Modeling panel

(Polygon) sub-object level

Subdivision panel
Shift+click

(MSmooth [MeshSmooth]) or choose MeshSmooth Settings from the drop-down list.
Use these settings to specify how mesh smoothing affects editable poly and Edit Poly objects.
Interface
For details on using the caddy controls, see The Caddy Interface.
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Smoothness
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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
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Prevents the creation of new polygons at edges between polygons that don't share at least one smoothing group.
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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
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Applies the settings to the current selection and closes the caddy.
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Apply and Continue
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Applies the settings to the current selection, retaining them for the preview if you then change the selection.
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Cancel
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Closes the caddy without applying the settings to the current selection. Does not reverse previous uses of Apply.