I’ve noticed that sometimes the Z3D is gone. When you start a new game, on the ship there is no 3D. If I load a savegame outside on the first planet, there is 3D.
Not sure yet if this extends to other locations.
Another game that switches the textures used for the depth buffer during gameplay, which isn’t always trackable. ALT+TAB out and back into a game can (but doesn’t always have to) help.
I’ll look into it, but can’t promise anything. As said above the game switches the texture used for the depth buffer during gameplay which is not always trackable.