Part Modeling > Base Features > Swept Blends > To Control the Perimeter of a Swept Blend
  
To Control the Perimeter of a Swept Blend
The blend control options let you select a method for controlling the shape of the swept blend between its sections. With the Swept Blend tab open, click the Options tab to set the following options:
Set perimeter control—Controls the shape of the feature by controlling its perimeter between the sections. If two consecutive sections have equal perimeters, the system attempts to maintain the same cross section perimeter between these sections. For sections that have different perimeters, the system uses linear interpolation along each curve of the trajectory to define the perimeter of the feature between its sections.
 
* You cannot specify both perimeter control and tangency conditions for the swept blend—only one of these conditions is allowed.
Create curve through center of blend check box—Shows a curve connecting the centers of the feature’s cross sections. This option is available only when the Set perimeter control option is selected.