Where do you learn anything about lux-materials? I tried luxrender these days, but did not find any substantial documentation about luxrender's materials except some parameter names in the lux scene file description. Otherwise any documentation on the topic seems to be like "Click here in the luxblend-gui and then the right thing will magically happen...". Is there some place where the lux scene file is documented, do i need to read the source, or am i looking in the wrong place (ie. is the knowledge in the PBRT-book or somewhere else?).