Hi wim,
> how do you do that, raise the bent part up a little? I can't activate the show points command, so how is it done?
I'm not sure if it's what Brian did, but to activate the show points command for a solid made up of trimmed surfaces you first need to use Edit > Separate to break it into individual surfaces. Otherwise it would be easy in many circumstances to move surface control points in an areas where there was a joined edge and open up a hole in what is supposed to be a common edge.
There's some more info on this topic on this FAQ entry here:
http://moi3d.com/wiki/FAQ#Q:_Why_does_show_points_work_for_some_objects_but_not_others.3F
And yeah definitely if some pieces of a surface push through itself making a self-intersection that will make the object not make a clearly defined solid volume and that will tend to mess up booleans.
- Michael
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