Ray Tracer Challenge in C# - Chapter 15 - Triangles

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Triangles in the Ray Tracer Challenge! We add support for triangles and an OBJ parser for importing files exported from 3D modeling packages. Several smaller fixes are made throughout all the code and I end things by rendering the head of my FNAF Foxy model.

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@GeorgeLecakes, I just started working through this book, but after you showed that there was a bug in the book related to not normalizing the vectors during triangle smoothing, it made me worried if there are other issues like this. I do not understand fully the matrix math behind the calculations and I am worries that I can get blocked at some point too far into the book. Could you please alaborate on that? Are there many "breaking" inaccuracies like this in the book? Thank you in advance!

gregoryarutyunyan