The Smooth Single Surface button 
allows you to free points within a selected surface, so that they can float between neighbouring points. The points you can smooth include the internal intersection points and the breakpoints on the boundaries. Corner points are never smoothed and remain in their original position.
You enter a tolerance, which represents the maximum distance each point can move. CopyCAD calculates the ideal position for each point, and if this position is within tolerance moves it to this position. If the ideal position is out of tolerance, CopyCAD displays a message box telling you that the smoothing action has been constrained by the tolerance setting, and moves the point as near to the ideal position as possible, within the specified tolerance.
You can also specify that you want to carry out the smoothing process gradually, which will give a smoother surface. CopyCAD moves each point by increments, based on the surrounding points' current position. You set the number of times you want CopyCAD to carry out the calculation using the Iteration box.
You can see whether a surface needs smoothing when dynamic shading is used to shade the model. To turn on this type of shading, right-click on the Graphics window, then select Shade – Dynamic Smoothness from the pop-up menu.
The results of smoothing can be seen in the examples below.
Before Surface Smoothing
After Surface Smoothing:
For each method of smoothing, you can see how the smoothing has affected the position of each point and internal. To view the original surface in addition to the new smooth surface, click on the Draw Original Surface option. If you then zoom in on the surface, you will see the original position of the points and internals as faint lines, as shown below.
Click on the links below to see how you can use this button to smooth a single surface.
Smooth Surface – Whole Surface
Smooth Surface – Picked Points
Smooth Surface – Picked Internals
