Smooth Face Shape
Edit 
Face Modify NURBS
Use this command to smooth one or more faces. Use the Modify Face command to smooth selected control points of a face. Smoothing refers to the process of shape editing to remove unwanted imperfections in a curve or face. There are five methods to choose from. The types of imperfections that can be removed include:
Ogee - Inflection point (sudden 180 degree change in curvature).
Flat spot - A local minimum of curvature.
Buckle/bump - A local maximum of curvature.
Bulge/knob - A discontinuous curvature such as a circular fillet.
Crease - A discontinuous tangent plane.
The process involves the redeployment of control points. Some points are allowed to move freely while others are constrained. In this way faces can be smoothed entirely or in local regions.
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Select the faces to smooth.
Enter the allowable deviation from the original geometry.
Select a fairing method from the Options Form.
Activate (check the box) or deactivate the desired constraints from the Options Form.
Pick OK to smooth the faces.
Minimum Energy - Used for minimum energy and to produce a less stressful and a more gradual smoothing of the face.
Minimum Jerk - Used to produce a face with less curvature variation such as with planes and spherical domes.
Flattening - Used to flatten or reduce those areas on the face with the greatest curvature. When the Gaussian Curvature Plot is displayed on the face, the areas of greatest curvature will be displayed in dark red and dark blue.
Rounding - Used to produce areas on the face that are more spherical in shape if possible.
Rolling - Used to produce areas on the face that are more cylindrical and conical in shape if possible.
Lock Edge Position
Activate to force the edge curve of the face to be constrained when fairing techniques are applied. The remainder of the face is allowed to move freely.
Lock Edge Tangency
Activate to force the edge curve and edge tangency of the face to be constrained when fairing techniques are applied. The remainder of the face is allowed to move freely.
This option requires that the face being modified consist of at lest 5 control points in both the U and V directions or fairing will have no effect.
Lock Edge Curvature
Activate to force the edge curves, edge tangency, and edge curvature of the face to be constrained when fairing techniques are applied. The remainder of the face is allowed to move freely.
This option requires that the surface being modified consist of at lest 7 control points in both the U and V directions or fairing will have no effect.
Lock All But
Activate to perform a local modification by smoothing only the control points actively selected.
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