If you have a couple of hours to waste over a few evenings what better fun could you have than to have a go at writing a ray tracer? Actually I can think of several things that might be more fun, but if you want to give it a go I have found a nice tutorial here: http://www.codermind.com/articles/Raytracer-in-C++-Introduction-What-is-ray-tracing.html.
I'm working through it myself, although I'm writing c# code. I'll let you know how I get on.
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