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Four years ago, I wrote a simple ray tracer in Java to render a scene hard-coded in the source code. After writing this ray tracer, I came to know about sophisticated ray tracing engines available for free on the internet. POV-Ray seemed to be one of the most popular engines and I decided to learn to use it. However, I never managed to devote time to learning it in the last four years. Finally, in May 2013, I decided to teach myself to do ray tracing with POV-Ray. This activity consisted of learning the concepts required to write scene descriptions for POV-Ray, and writing a new scene each day for 25 days in the month of May 2013.
One light source is shining from the top right corner of the scene. This light source is behind the camera. This casts the shadow of the green box on the blue ball and that of the blue ball on the yellow one.
Another one is shining from the left side of the scene. This light source is also behind the camera. This casts the smaller shadow of the red box on the blue ball, that of the green box on the orange ball and that of the blue ball on the pale pink box.
