The Y every wall drops to: below the lowest ground the map can produce, plus
depth. Derived from the elevation range rather than by sampling every
cell's perturbed height — the bounds below are exact worst cases, so no cell
whose noise happened to dip further than the ones sampled can poke through.
The Y every wall drops to: below the lowest ground the map can produce, plus
depth. Derived from the elevation range rather than by sampling every cell's perturbed height — the bounds below are exact worst cases, so no cell whose noise happened to dip further than the ones sampled can poke through.