Hi! I´m reading Tricks of the Windows Game Programming Gurus and there´s a section on chapter 13 on vectors reflection where the author writes a couple of formulas that I couldn´t understand. I´m not going to write all the derivation the author made, but for the ones that have read the book: Can somebody explain me the formulas that appear on page 834? They are: L = N + I and F = N + L Where do they come from? I know that they work, because in the following section there´s an example but those formulas are what I need to fully understand this topic. Thanks for helping me!!

Read the two pages before hand, it explains them there. The derivation should explain them easy enough. If not, brush up on your vector manipulations.

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