The following step-by-step example describes how to use the Linear Surface command to create linear sweep surfaces with a common vertex. Once you have selected the Linear Surface command, proceed as follows:
| 1 | To obtain an associative surface, that is an open solid — a Skin — retaining a link to its base curves, so that if you modify such curves the surface will be modified accordingly, check the Associative Mode box. See "Associative Surfaces (Skins)" for details. |
| 2 | Select the base curves. As soon as a curve is selected, the preview of the corresponding surface is displayed  Each time you modify a parameter, the preview is also updated. To change the selected curves, right-click on Curves in the selection list, select Reset in the context menu and perform selection again. |
| 3 | In the Draft drop-down list select
Vertex. The selection list will display the
Vertex item. |
| 4 | Click on Vertex in the selection list and specify the vertex point for the surfaces to be created. The Start Value and End Value mini-dialog boxes are displayed.  |
| 5 | In the Start Value and
End Value boxes respectively, type the values of the parameter (between 0 and 1) to modify the vertical extension of the conical surface. |
| 6 | Clicking on the More Options item in the selection list, you will be enabled to choose whether to create the base surfaces (endcaps). (Only if the base curve is closed). |
| 7 | Click  or  to confirm your selections and create the surfaces. Click  to discard your changes. |