Here's another example - say you want to carve off the end of a cylinder.
To do that you might draw a curve in a side view that is positioned to intersect it visually, like this:
If your cylinder is an open surface, it might look like this:
You can use Boolean Difference to cut that cylinder surface up using the curve as the cutting object, which will cut it into pieces like this:
Then if you delete the end piece you'll see that you still have an open surface:
However, if you have a solid cylinder that has the ends capped off, it would look like this:
When it's a solid the booleans know how to combine the pieces together to keep the result a solid, which can help to avoid trying to manually build the side wall pieces.
- Michael
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