Here at BN, we've talked about Sunflow (the open source, platform independent (thanks to Java), photo-realistic rendering system) several times (1, 2, and 3). Now, thanks to hafunui (a well known Sunflower (Sunflow-er, get it?), you can get into using the Sunflow shaders thanks to his overview. The site covers the Diffuse, AO, Glass, Mirror, Phong, Ward, Shiny, and Constant shaders as well as the creation of custom shaders through Janino.
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