The brightness inside and outside the car is the same
How to reduce the brightness of car interior
But at present, I want to maintain the direct light brightness of the exterior environment and reduce the direct light brightness of the interior (not the brightness of the material). The effect is like the shadow of the sun through the black glass
Mayby you can try to reduce the specular scale of your material or make the material of your car interior a little darker and if there is a lightsource affecting it you can try to reduce it’s intensity.
(sorry for bad english)
if you want your window to be darker you can change its alpha value i think that should change the effect of the window’s shadow
Thank you ,your answer is useful. Although the effect is not perfect, it is good