It is actually very interesting but fairly organic in a sense that it strongly depends of the stuido size, a small studio have fewer employees who tends to be more polyvalent (On Runes for exemple I tend to be Game Artist, Concept artist, Art director (of myself only haha), a bit game designer etc. While in bigger companies such as Ubisoft, it is totally different and highly specialized.

Thanks for the fact ! I didn't know about that ! I have so much respect for these guys, it seems so technical. Same for 3D artists, some managed to jump from a videogame career into Tesla Motors, Nasa or Robotic industry, that's crazy.