Assigns terrain types and plant-density feature levels to every cell
based on temperature × moisture biome matrices, with post-matrix elevation tweaks.
Fills as many feature layers as the map has, up to four: 0 conifers,
1 rocks, 2 broadleaf trees, 3 bushes. A map built with fewer simply stops
early, so the two-layer maps this used to write are unchanged.
Assigns terrain types and plant-density feature levels to every cell based on temperature × moisture biome matrices, with post-matrix elevation tweaks.
Fills as many feature layers as the map has, up to four: 0 conifers, 1 rocks, 2 broadleaf trees, 3 bushes. A map built with fewer simply stops early, so the two-layer maps this used to write are unchanged.