Attached Link: http://www.arcanefractals.com/mythology.shtml

Hi Jools, My experience is mostly with flame fractals here. If you look at my flame fractal titled Mount Olympus, specifically the cloud formation, is this what you mean by being "lit"? If so this lit effect was bought about by increasing the "brightness" and "vibrancy" values (in Apophysis). When I first rendered this flame I nearly discarded it because it was extremely dull. By increasing the above settings the image was transformed. However the gradients themselves also determine if areas are lit plus the form or density of the flame fractal itself. So really the interaction of these factors determine if areas are lit/highlighted. This is where all the time is spent experimenting and playing with gradients and the lighting controls. Hope this info helps you a bit. Fran