bernd wrote:Just realized the system might not work if a solid is inside another solid, because all elements of the inner solid belong to the outer solid too. I need to try this on the mesh region object.
You maybe consider another test case like a sphere completely inside a box where one not so easily can select a face or edge. This shortcoming was the starting point to write the Element-selector macro.
Here an according file where I would like to select the inner solid as part of the BooleanFragments: