What is it specifically that you do not understand about "smart" materials?
And what is it that you do understand?
[Basically, every Building Material (BM) has an Intersection Priority Number (IPN) defined for it in the Building Materials Settings Dialog. When two structures, like a Wall and a Slab collide in 3D, the program takes each pair of skins of each colliding pair of elements and performs the following action: the skin with the BM having the higher IPN will cut its geometry out of the geometry of the skin it collides with that has a BM with a lower IPN.]
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