In the release notes for 4.14 it says:
New: Mobile vertex fog is now a project option. - It can now be enabled or disabled regardless of Mobile HDR project setting.
So I can see the project option but how do you actually get it in your level? Or is the atmospheric fog just vertex fog automatically?
Or does it need to be specified in the material of an object?
Orrr is it only on translucent materials?