2 things done today:

1. Fixed the black sphere bug. I realized the issue was generating the colors by using normal vectors, which return values between -1 and 1. Since negative values are clamped to 0 by the color module, I rendered black spheres. I fixed this by making a designated randomColor() function.

2. I added Bounding Volume Hierarchies, or BVH for short. BVH creates a massive performance increase, just over doubling render speed (from 6:30 to 3:04). This feature was by far the hardest to implement and understand, but basically it chunks up objects in the world to be in groups of boxes, and instead of looping through each object in the scene for collision checks, we loop through bounding boxes (groups) first, eliminating the objects that were missed. There was lots of friction creating this feature, especially after implementing a new loop that mathematically, should make the renderer faster, but in reality it became ~2.6x slower? I scrapped that for now and I’ll revisit it later.