OCB Better First Person View (A20 Experimental)  

A small and experimental Harmony Mod that enables a true first person view, which supports proper shadows on your hands and equipped tools. No more glowing pick-axe when mining underground during the day.

The main selling point of this mod is the immersion factor, as the wrong lighting/shadow of the FPV hands/tools are really off in dark settings. Unfortunately this mod has its own issues, which I tried to minimize by applying more hacks to the code. Therefore I would consider this mod experimental for now.

This mod is not EAC compatible, so you need to turn EAC off! Otherwise it should work on linux and also via vortex mod manager. Should also work for multiplayer, but hasn't been tested that well yet.