... f-number. This is how the building looks from camera angle: Now turn on GI, I wouldn't describe settings now, becouse it will be in other section, but in shortcut i used QMC + LC, and HSV exponential ... now. As you can see this image is overbrighted. All you need to correct it is to change camera settings. Set f-number on 7,0, shutter speed on 45, and film speed(ISO) on 50. And here we got....