Another example:
A hollowed box with cylinders sticking through it:
With the inner faces selected:
Then boolean union will generate this:
With the outer faces selected:
Then boolean union will generate this instead:
Basically by making a face selection of just the outside it lets you make the booleans temporarily disregard the inner hole. And with a face selection of just the inside part it makes the booleans temporarily consider the outside to be extremely thick. But all just by making a selection.
- Michael
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