What do you mean by a net of 3D shape?
Net is collection of blocks of a 3D shape
Net is 2D shape made up of nets
Net is nothing but the 2D image of 3D object
Net is a layout which when folded from edges forms the 3D shape
Net is a layout which when folded from edges forms the 3D shape.
What you mean by packing fraction in 3D?