RT is by far the least efficient method of doing that.
One of the issues with RT is that it actually creates &quot;unrealistic&quot; lighting at least as far as computer entertainment goes the global illumination tends to be way too uniform and washed out.
It looks great on the big screen when your eyes can adjust to the brightness of the screen which is the most luminous object in the room but it looks really washed out on a monitor in a well lit room.