Trying to work through why this is less work efficient.
Consider 6 nodes with a branching factor of 2 versus a branching factor of 6.
With a branching factor of 2, we need only look at 4 BVH's: we look at two nodes at the first level, pick one, then look at its two children. With a branching factor of 6, we obviously look at all 6 nodes.

Trying to work through why this is less work efficient. Consider 6 nodes with a branching factor of 2 versus a branching factor of 6. With a branching factor of 2, we need only look at 4 BVH's: we look at two nodes at the first level, pick one, then look at its two children. With a branching factor of 6, we obviously look at all 6 nodes.