Book 2: 7.6/7.7 Cornell Box & Flipped Objects Question

[hackmad]

I've read through both Book 1 and 2 a couple times and I might have missed something obvious that seems unclear to me. I do not see how the render of the Empty Cornell Box in 7.6 resulted in 3 of the faces rendering with black colour.

Looking at the Lambertian material it does not care about front_face and returns an attenuation regardless of this flag. I get the same result whether I use the flipped object or not.

I'm working in Rust (using this as a means to learn both) so it is quite possible something is off. This is the render I get:

I've tried adding Flipped Objects as well but it does not change the result.

Not that this is a good reference but if it helps my implementation is here: https://github.com/hackmad/raytracing_series

[hollasch]

Thanks for reporting (and confirming suspicions). This is covered in issue #482.