From what I understand (based on several overly scientific artices) light synthesis deal with light and how the light spectrem breaks down into colours. It also deals with how the different colour spectrems (in a beam of light) interact with the surrounding enviroment. Although most of the articles I found delt with rendering models to map binary star systems, and I am not Mr. Wizard when it comes to science so I probably missed other important things regarding light synthesis. Cheers. P.S. I want to easily import and poser animations or Daz animations and animate them in Bryce. Also a better terrain editor that allows you to create joining sections of terrain without the hassels of marking north, south and other such directions as I get confused after the tenth or eleventh terrrain. P.S.S. Animatable dust, rain, snow, waves, wind , water/ lava and trees would be nice.