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Thanks, I will have a look as well.

I found this article http://meshlabstuff.blogspot.com/2009/04/how-to-remove-internal-faces-with.html but it doesn't seem to be consistent :thinking: Also the attached file is a bit more interesting case to be tested (this is by using...

Hi Marco, A small update, I hope it can be useful. I've tried to play a bit with the `boundary()` function and it seems to work quite nicely at least...

Yes, I am looking at it. For some reason it seems that the returning face ids are wrong... :thinking: how can I create a separate mesh from the returning face...

ok, investigating a bit more I've noticed two things: 1. The returned cell ids from the `boundaries(returnCellIds=True)` method are mostly correct except that there are also some small faces which...

The `returnPointIds=True` parameter seems to return the correct boundary points (points in red dots):  but the `returnCellIds=True` returns these extra non-boundary faces (or better partially boundary since one edge...

> interesting findings, you may need to unpack the two methods to see why the cell ids in the first case seem wrong. > Yes, I was trying that. Didn't...

@marcomusy I didn't manage to have any progress on this, thus if you could have a look on it when you find some time I would appreciated it ;-).

Hi Marco, thanks for the update. Interesting, yes it still doesn't work perfectly. At least now the inner cells are removed. However, now the detected edges also look quite different....

Thanks, indeed now is better. I still get the holes on the surface as you mentioned, thus I've tried to apply some hole filling with `fillholes()` but it doesn't seem...