Ray Tracing Basics from begining to Advance

[Best and Simplest Ray tracing in Java] I have made enormous search on internet to learn about Ray Tracing but no effort but with the Articel searched and formuale I have come to made a Wonderful Ray tracing Examples with simplest code and present it supports diffuse light and ambient light. in future i add specular light,shadowing and ground plane. hope all of you like my code very well. to convert HSVtoRGB i take the help of tutorial at site http://www.mandelbrot-dazibao.com/ so i appreciate their tutorial and they are very helpful for me.