hey there, I have tried many different lightss, renders, read tutorials on the internet and I still cannot understand why are the walls so dark on the inside, it's like only the direct light works. any suggestions? I need an outside opinion, thanks. Rendered with mental ray in 3ds max.
you might need to use final gather with a large portal light at the opening of your building. that should transfer the image based lighting of your outside environment into the building
Do you use any exposure controls ? And for what it worth this lighting kinda make sense, since you seem to be using a sunset HDR. Those are mainly dark except for the sun part :P. If this was a photo you were taking in real life, to get details in those dark area you will need some low shutter speed and low f number.