Building lips

In this task you will use the Global Sweep command to create lips on some surfaces.

• First of all you will create some surfaces by sweeping some contours along a drive keeping an orientation based on the one of some selected surfaces (that is: during the motion, the normal will be the one of the surface, while the tangent will be the one of the curve).
• From the new surfaces, you will then create a static solid using the Make Solid command.
• Finally, using a Boolean Difference you will obtain the "lips".

Please note that the model used in this task is contained in file "LIPS.e3".

1	Start the Global Sweep command. In the Motion Mode drop-down list select Surface based.
2	As drive curves, select the inner boundaries of the uppermost surfaces. Right-click and select Continue to end the drive curve selection.
3	In the Sweep drop-down list, choose Curves and then select the section curves.
4	Check the Close Sweep box to obtain a closed surface. Click the Preview button ( ) to assess the result you will obtain. Click to create the surfaces.
5	Start the Make Solid command and transform all of the surfaces created using the Global Sweep command into a solid.
6	Finally, to obtain the "lips", start the Boolean Difference command and subtract the solid obtained in previous step (Solid B) from the original one (Solid A). The lips are created.