How to cut a 3D surface in 2 parts?

 From:  Michael Gibson
650.4 In reply to 650.3 
Very cool Pilou, great example!

One other quick tip - if your cutting curve is planar you should generally be able to skip the extrude step, since there is some automatic extruding built into Trim itself.

Also sometimes it can be convenient to use Boolean Difference to do cuts like this as well.

- Michael