Creating a Bi-driven surface

The Bi-driven Motion Mode of the Global Sweep command enables you to create surfaces by moving one or several section curves along two drives, which may be curves or surface boundaries, ensuring G0 continuity along the two drives.

Please note the following:

• If the end points of the selected section curves initially lie on the two drives, they will be kept on the drives along the whole motion.
  If the end points do not initially lie on the drives, they may not lie on the drives along the motion.
• Though the selected section may be tangent to two surface boundaries selected as drives, only G0 continuity is ensured along the motion.

In the following model, the red curves are the section curves, while the blue ones are the drives.



To create a surface with the new Bi-driven Motion Mode, proceed as follows:

1. Start the Global Sweep command. In the Motion Mode, select Bi-driven.
2. Select the drive curves.
   
   
    
3. Select the section curves (as many as you like).
   
   
   
   While the command is active, you can always click the Preview button ( ) to assess the result you would obtain.
   
   
   
   And the surface you obtain ensures G0 continuity along the drives.
   
   

Please note that if any discontinuity is detected in the drives, a specific message is displayed



and the surface is created accordingly.