Johann Meyer

I initially started with a non-abstract hittable class but decided to place it into a separate class as it clarifies the intent of the class and the design pattern being...

If the `hittable_list` has 1 or 0 objects (aka `object_span` 1 or 0) it will fail. The current code goes into an infinite recursive loop if the hittable_list is empty....

[The test branch](https://github.com/RayTracing/raytracing.github.io/tree/bvh-optimisation-890) By only applying the change below and including optimisations (-O3 -ffast-math) in the compiler settings, it took off 10 seconds from the execution time of `theNextWeek` (1m22s...

I am unable to reproduce image 7 in sec 8.21(The first render of a diffuse sphere) and image 8 in sec 8.22 (gamma correction). My images are much darker than...