Also, as Guitta pointed out, in the "Building a Sunset Atmosphere" tutorial on page 250, just scratch out step #11, because THAT one will definitely drive you nuts, as it's completely impossible to change a sky color map in volumetric mode. I was scrambling all over the manual looking for an answer, and seriously considering my installation was bad... So, avoid #11 on page 250 like the plague! Just skip to #13. It should have had more steps or tips added, such as the fog/haze color/density will have EVERYTHING to do with the lighting, as wil the light color, light intensity, fgade out...etc...