Some sites of the models won't illuminate properly I'm trying to render cars, but it seems as if they are not really affected by anything I do with the lighting. There seems to be a lightsource coming from the bottom right, but even if I put a Sun above them their roofs don't get illuminated properly. For comparision I added a cube without materials, as you can see it is already quite bright.

I tried:


Scaling the model
Different lights and lightsources (also objects with emission)
Changing the exposure and gamma in the scene colour management
Changing the background color




I attached the .blend too: Scene
Go into Properties > Data > Normals > and unclick Autosmooth, I guess it was creating a bug