Volumes smoke and fog box rendering incorrectly.

[Echo-316]

Hello community, I have been following the book series initially in python but have moved to c++ for faster render times (and to learn c++).

So far everything has been working nicely, however, when I render the Cornell box with smoke and fog boxes I end up with everything working normally except the base of the boxes which are returning a near solid white square shape, (I have attached a png of the rendered image below.)

I currently think that the issue is one of two, however I am more than likely wrong on both of them.

1. The issue lies with the positioning of the box and the floor, although I'm still not 100% sure on how or why it would occur.
2. Somewhere, somehow, rec.normal or the normal direction of the bottom face is returning something it is not supposed to, again I am not sure why this is happening.

Given this series is my introduction to c++ I have mostly been copying the code word for word excluding naming conventions, so I was wondering if anyone had come across this issue in the past or if it is a blatantly obvious issue I am just missing.

Ps due to me also not understanding github any code specifics will be given upon request at least until I can learn how to upload my files etc.

[Echo-316]

Update:
There was a bug in my aabb.h file that was fixed.

[hollasch]

Thank you for taking the time to document and follow up!