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Not too long ago I blogged about a C# raytracer which took advantage of a lot of C#3.0 language constructs. However, you may have noticed that it did not actually use LINQ query expressions all that much. Well, after discussing this with a coworker on the PLINQ team at lunch one day - I was convinced that it should be possible to express the logic of the raytracer in a LINQ to Objects query. The result is below - a single 60-line LINQ query which captures the complete raytracing algorithm.