@AndreasFSC I don´t know what an indirect answer is or can be so..
You seem pretty expert on the subject (as always said, I know nothing about shaders) I was just making a sugestion to cooperate with you asking about the cockpit darkness.
I post some recent screens of sascha´s GT3 and its values for you to also have a comparison point.
It make me remember how I always think that bottom of surfaces (like bridges) should be darker. I make simple draws to make myself clear.
I also wonder about how much the scene would change if everything and even bumpmaping would receive this treat.