We are now (i think) correctly enforcing the max_pts_per_leaf. However,
I'm not sure that the tail recursion is really sampling it properly.
Merge branch 'json_octree_nodes' of https://github.com/nmarshak1337/PointMan-Renderer into json_octree_nodes
Well, now I average the positions of all the vertices beforehand. But
now... the progressive loading doesn't look good.