3D & Materials: The ability to color individual sides and parts of a 3d object
(specifically extruded ones)
In legacy-classic 3D this is possible by mapping a flat-filled symbol to a subsurface in Map Art dialog.
In modern 3D we don't have mapping yet, but it’s an obvious feature to have.
This also means that we should be able to apply materials not only for entire object, but also selected parts of it. Something like material IDs from 3DS Max, but better.