Multiplies the number of faces in selected mesh objects or faces.

Button
Ribbon: Home tab
Mesh
panel
Refine
MeshNot available on the ribbon in
the current workspace
Menu: Modify
Mesh
Editing
Refine
MeshNot available in menus
in the current workspace
Toolbar: Smooth
Mesh
Refining a mesh object increases the number of editable faces, providing additional control over fine modeling details. To preserve program memory, you can refine specific faces instead of the entire object.

Refining an object resets the smoothing level that was assigned to the object to 0 (zero). This level of smoothness becomes the new baseline for the object. That is, the smoothness level can no longer be decreased beyond that level. Refining a subobject does not reset the smoothing level.