The player can often have a light, and is usually pretty dynamic. One of the effects I really like is bounce lighting. Especially with proper color. If I point

The player can often have a light, and is usually pretty dynamic. One of the effects I really like is bounce lighting. Especially with proper color. If I point my flashlight at a red wall, it should bathe the room in red light. Can be especially used for great effect in horror games. I was playing Tokyo Xtreme Racer with ray tracing, and the car's headlights are light sources too (especially when you flash a rival to start a race). My red car will also bounce lighting on the walls in tunnels to make things red. It doesn't even have to be super dynamic either, I can't even think of a game that has opening a door to the outside sun to change the lighting in a room with indirect lighting (without ray tracing it). Something I do every day in real life. It would be possible to bake that too, assuming your door only has 2 positions.