EDIT: I misread the scientific notation, I was getting, “-4.37114e-08”, turns out that’s almost 0. GTest’s ASSERT_FLOAT_EQ is super conservative by default haha. I’m good. Thanks for such a great book 
@jamis
I bought the book some years ago and did through a lot of it, but wanted to revisit it from scratch again, as a more experienced programmer.
However, for the test of multiplying a rotation X matrix of pi/2 radians by a Point(0, 0, 1), it fails generating a point where the y component is ~-4.4. Interestingly, the test after for multiplying the inverse(rotation_x(pi/4)), my code passes that test.
I’m hoping to work on my math skills, but I’m not sure exactly where I should be focusing my debugging efforts, or what tests to catch potentially if theere’s some other issues with dependent code that I missed.
Thanks again for a great book