@beanworks
> In your hollowed out oval example, what happens if you do a boolean difference
> with just the outside face and the retangular thing? Does it create a hole in just that face?
Yeah it will cut just the outside face, but then you'll be left with a somewhat weird result where the part of the box that was towards the inside of that face will be connected to it but that box piece will just be overlapping with the other inside pieces. It would look like this, where the only common edge between the box and the oval will be at that outside face:
You would not want to leave the object in that state because it's self-intersecting with some of its surfaces just sticking into each other instead of coming to common edges.
If you wanted to cut just the outside face and not leave any part of the box behind at all, that would mean the end result would not be a solid anymore. But you can get that type of result if you want by using the Edit > Trim command instead of a boolean - Trim only cuts the surface skin of objects and it already allows you to trim a face sub selection, using Trim would give this type of result:
If you want to cut an object and leave no pieces of the cutting object in the final result (no "side walls" or anything), then Trim can do that. The difference between Trim and Booleans is that booleans try to combine pieces of both objects together in the final result, to try and make the end result a solid.
- Michael
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