The user can create an extruded surface geometry by the following procedure.
•Profile, Distance
•Profile: Selects a profile.
•Distance: Defines a distance of the extruding length.
•Curve, Direction, Distance
•Curve: Selects a curve.
•Direction: Defines the extruding direction for the extruded surface geometry.
•Distance: Defines a distance of the extruding length.
•WithDialog
•WithDialog: Extrude dialog box is shown. The surface is created by clicking OK in the Extrude dialog box.

Figure 1 Extrude dialog box
o Color: Specifies the color of the surface to be created.
o Direction: Defines the extruding direction for the extruded surface geometry.
o Distance: Defines a distance of the extruding length.
o Add/Remove: Selects several edges of any geometries as the user wants to add or remove.
o Add/Remove (Continuous): When using Add/Remove, if this option is checked, the connected edges within the degrees are selected together.
o Tolerance (Degrees): The angle of between the connected two edges.
o Preview: Previews the surface to be created on Working Window.
o Update: Update the preview.