This function allows the user to create a surface from two selected lines (curves). The user can select a line using the options in the Control Keys dialog box as illustrated in Figure 5.2.3.

Figure 5.2.3  Control Keys dialog box

·          LINE –  Allow the user to select lines (default).

·          LINE SEGMENT – This option allows the user to select several line segments to form a line.

·          POINTS/NODES – This option allows the user to select two points/nodes to form a line.

Select the lines, the line segments, or two points/nodes from which the surface will be created.  After the second line is selected or formed from line segments or two points/nodes, the surface will be generated.