Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsGraphics Lighting Transformationhttp://demonstrations.wolfram.com/GraphicsLightingTransformation/]]>http://demonstrations.wolfram.com/GraphicsLightingTransformation/Diffuse and Specular Reflectionhttp://demonstrations.wolfram.com/DiffuseAndSpecularReflection/]]>http://demonstrations.wolfram.com/DiffuseAndSpecularReflection/Pappus Chainhttp://demonstrations.wolfram.com/PappusChain/]]>http://demonstrations.wolfram.com/PappusChain/