as a newbie i tried to make a difference with solids.
the code worked but the original solids seems toi be remaining. So in Revit i see both of them in a hollow yellow and not the expected result of a new solid with a cutout.
See the both screenshots.
What i am doing wrong? Is there a special node that converts afterwards to the new solid? or does it not work correctly with revit?
I also tried ImportInstace.ByGeometry but its also not useful. I got somehow the object to look as expected, but coming to export to fbx revit says there is nothing to export.