Creates a surface or polygon mesh by running a profile curve along an axis.
To apply: See Extruding Curves along Axes [Modeling and Deformation Basics].
To redisplay: Select the extruded object then choose Edit Properties Modeling Properties and click the Extrusion tab.
Specifies whether the extruded surface is open or closed in U and V. These option work only if the corresponding input curves are open. If the input curves are closed, the surface will always be closed in the corresponding direction.