The idea is that this encourages you to experiment and have a look at the code yourself before being introduced to theory. I generally present stuff in a back-to-front manner: first an article with some (well commented) code and images of the results, then one or more articles discussing the concepts. Blender has ray tracing renderers of course but that is not the point: by reusing Python libraries and Blender's scene building capabilities we can concentrate on true ray tracing issues like shader models, lighting, etc. We will be creating code that will run inside Blender. I am not sure where this will lead but I am open to suggestions.
This is an article in a multipart series on the concepts of ray tracing.
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