From:  Michael Gibson
3290.9 In reply to 3290.8 
Hi Burr,

> I love this command! Still the need to get it in my
> head, but so very cool!

Maybe it will make a bit more sense if I show the internal intermediate stage.

So with the 2 input curves like this:

The booleans will internally create extrusions for those, the closed curve becomes a volume and the open curve becomes a surface, like this:

Then "intersection" means to take the parts that are common to both objects. For a volume and a surface it will take the parts of the surface that are also contained within the volume, which gives this result:

But it's kind of nice to be able to generate this result just directly from the curves and let the booleans internally deal with extrusions of pieces into surfaces or volumes instead of having to do those as additional manual steps.

- Michael