Variable surfaceKinds`Const`

surfaceKinds: readonly [
    "water",
    "ice",
    "forest",
    "grass",
    "scrub",
    "farmland",
    "sand",
    "mud",
    "gravel",
    "rock",
    "paving",
    "urban",
    "roads",
] = ...

The surfaces the plugin textures, each drawn with a material of its own.