1.11.2 snell's law, Dialectric rendering is off

[2c2c]

Hi, I appear to have a subtle bug after implementing dialectric material. I don't see any deviations in the net new code from this chapter, so I'm guessing it's something subtle going on in code from prior chapters. debugging tips or advice appreciated :-)

https://github.com/2c2c/raytracing

i'm shoehorning polymorphism in zig to follow the book's structure, so the code may not be pleasant :) Another user seems to have the same bug at https://www.reddit.com/r/rust/comments/1dmi3fd/raytra_raytracing_in_a_weekend_refraction_issues/ if rust is your preference