I did have someone contact me, showing their own Screenshot of how Rendering with an Octree and Marching Cubes would look like, and giving me some rough performance Data. An equivalent of the furthest possible Minecraft Render Distance uses less than 2GB of RAM, and can run on a Raspberry Pi 3.
For that one I more meant like “This Node has 8 Leaves that are all Air, instead of storing 8 more Leaves we will store one Leaf referencing Air”, meaning “All Sub-Leaves are Air, so why waste Memory storing them and just say ALL of this giant Cube is Air”
That will be left to the setBlock() and loadNodeFromFile() Functions, lol.