Region Settings

The region_settings define the attributes for map generation that apply to an entire region. The general settings define the default overmap terrain and ground cover. Additional sections are as follows:

Section Description
region_terrain_and_furniture Defines the resolution of regional terrain/furniture to actual types.
field_coverage Defines the flora that cover the field overmap terrain.
overmap_lake_settings Defines parameters for generating lakes in the region.
overmap_forest_settings Defines parameters for generating forests and swamps in the region.
forest_mapgen_settings Defines flora (and “stuff”) that cover the forest terrain types.
forest_trail_settings Defines the overmap and local structure of forest trails.
city Defines the structural compositions of cities.
map_extras Defines the map extra groups referenced by overmap terrains.
weather Defines the base weather attributes for the region.
overmap_feature_flag_settings Defines operations on overmap features based on their flags.

Note that for the default region, all attributes and sections are required.

Fields

Identifier Description
type Type identifier. Must be “region_settings”.
id Unique identifier for this region.
default_oter Default overmap terrain for this region.
default_groundcover List of terrain types and weights applied as default ground cover.

Example

{
	"type": "region_settings",
	"id": "default",
	"default_oter": "field",
	"default_groundcover": [
		[ "t_grass", 4 ],
		[ "t_dirt", 1 ]
	]
}

Region Terrain / Furniture

The region_terrain_and_furniture section defines the resolution of regional terrain/furniture to their actual terrain and furniture types for the region, with a weighted list for terrain/furniture entry that defines the relative weight of a given entry when mapgen resolves the regional entry to an actual entry.

Fields

Identifier Description
terrain List of regional terrain and their corresponding weighted lists.
furniture List of regional furniture and their corresponding weighted lists.

Example

{
	"region_terrain_and_furniture": {
		"terrain": {
			"t_region_groundcover": {
				"t_grass": 4,
				"t_grass_long": 2,
				"t_dirt": 1
			}
		},
		"furniture": {
			"f_region_flower": {
				"f_black_eyed_susan": 1,
				"f_lily": 1,
				"f_flower_tulip": 1,
				"f_flower_spurge": 1,
				"f_chamomile": 1,
				"f_dandelion": 1,
				"f_datura": 1,
				"f_dahlia": 1,
				"f_bluebell": 1
			}
		}
	}
}

Field Coverage

The field_coverage section defines the furniture and terrain that make up the flora that cover the field overmap terrain.

Fields

Identifier Description
percent_coverage % of tiles in the overmap terrain that have a plant.
default_ter Default terrain feature for plants.
other List of features with % chance when default_ter isn’t used.
boost_chance % of field overmap terrains with boosted plant growth.
boosted_percent_coverage % of tiles in the boosted that have a plant.
boosted_other List of features in the boosted with % chance when default_ter isn’t used.
boosted_other_percent % of boosted_percent_coverage that will be covered by boosted_other.

Example

{
	"field_coverage": {
		"percent_coverage": 0.9333,
		"default_ter": "t_shrub",
		"other": {
			"t_shrub_blueberry": 0.4166,
			"t_shrub_strawberry": 0.4166,
			"f_mutpoppy": 8.3333
		},
		"boost_chance": 0.833,
		"boosted_percent_coverage": 2.5,
		"boosted_other": {
			"t_shrub_blueberry": 40.0,
			"f_dandelion": 6.6
		},
		"boosted_other_percent": 50.0
	}
}

Overmap Lake Settings

The overmap_lake_settings section defines the attributes used in generating lakes on the overmap. The actual placement of these features is determined globally across all overmaps so that the edges of the features align, and these parameters are mostly about how those global features are interpreted.

Fields

Identifier Description
noise_threshold_lake [0, 1], x > value spawns a lake_surface or lake_shore.
lake_size_min Minimum size of the lake in overmap terrains for it to actually spawn.
lake_depth Depth of lakes, expressed in Z-levels (e.g. -1 to -10).
shore_extendable_overmap_terrain List of overmap terrains that can be extended to the shore if adjacent.
shore_extendable_overmap_terrain_aliases Overmap terrains to treat as different overmap terrain for extending shore.

Example

{
	"overmap_lake_settings": {
		"noise_threshold_lake": 0.25,
		"lake_size_min": 20,
		"lake_depth": -5,
		"shore_extendable_overmap_terrain": ["forest_thick", "forest_water", "field"],
		"shore_extendable_overmap_terrain_aliases": [
			{ "om_terrain": "forest", "om_terrain_match_type": "TYPE", "alias": "forest_thick" }
		]
	}
}

Overmap Forest Settings

The overmap_forest_settings section defines the attributes used in generating forest and swamps on the overmap. The actual placement of these features is determined globally across all overmaps so that the edges of the features align, and these parameters are mostly about how those global features are interpreted.

Fields

Identifier Description
noise_threshold_forest [0, 1], x > value spawns forest.
noise_threshold_forest_thick [0, 1], x > value spawns forest_thick.
noise_threshold_swamp_adjacent_water [0, 1], x > value spawns forest_water if forest near a waterbody.
noise_threshold_swamp_isolated [0, 1], x > value spawns forest_water if forest isolated from water.
river_floodplain_buffer_distance_min Minimum buffer distance in overmap terrains for river floodplains.
river_floodplain_buffer_distance_max Maximum buffer distance in overmap terrains for river floodplains.

Example

{
	"overmap_forest_settings": {
		"noise_threshold_forest": 0.25,
		"noise_threshold_forest_thick": 0.3,
		"noise_threshold_swamp_adjacent_water": 0.3,
		"noise_threshold_swamp_isolated": 0.6,
		"river_floodplain_buffer_distance_min": 3,
		"river_floodplain_buffer_distance_max": 15
	}
}

Forest Map Generation Settings

The forest_mapgen_settings section defines the attributes used in generating forest (forest, forest_thick, forest_water) terrains, including their items, groundcover, terrain and furniture.

General Structure

At the top level, the forest_mapgen_settings is a collection of named configurations, e.g. forest, forest_thick, forest_water. It is possible to define settings for overmap terrains that are not rendered by the forest mapgen, but will be used when blending forest terrains with other terrain types.

{
	"forest_mapgen_settings": {
		"forest": {},
		"forest_thick": {},
		"forest_water": {}
	}
}

Each terrain then has an independent set of configuration values that control the mapgen.

Fields

Identifier Description
terrains The overmap terrain IDs which have this biome.
sparseness_adjacency_factor Value relative to neighbors controls how dense the overmap terrain will be.
item_group Item group used to place items randomly within the overmap terrain.
item_group_chance % chance, between 1 and 100, that an item will be placed.
item_spawn_iterations Number of times that the item spawning will be called.
clear_groundcover Clear all previously defined groundcover for this overmap terrain.
groundcover Weighted list of terrains used for base groundcover.
clear_components Clear all previously defined components for this overmap terrain.
components Collection of components that make up the terrains and furniture placed.
clear_terrain_furniture Clear all previously defined terrain_furniture for this overmap terrain.
terrain_furniture Collection of furniture conditionally placed based on terrain.

Example

{
	"forest": {
		"terrains" : [ "forest" ],
		"sparseness_adjacency_factor": 3,
		"item_group": "forest",
		"item_group_chance": 60,
		"item_spawn_iterations": 1,
		"clear_groundcover": false,
		"groundcover": {
			"t_grass": 3,
			"t_dirt": 1
		},
		"clear_components": false,
		"components": {},
		"clear_terrain_furniture": false,
		"terrain_furniture": {}
	}
}

Components

The components are a collection of named objects with a sequence, chance, and set of types that, during mapgen, are rolled in sequence to pick a feature to be placed at a given location. The names for the components are only relevant for the purposes of overriding them in region overlays.

Fields

Identifier Description
sequence Sequence in which components are processed.
chance One in X chance that something from this component will be placed.
clear_types Clear all previously defined types for this component.
types Weighted list of terrains and furniture that make up this component.

Example

{
	"trees": {
		"sequence": 0,
		"chance": 12,
		"clear_types": false,
		"types": {
			"t_tree_young": 128,
			"t_tree": 32,
			"t_tree_birch": 32,
			"t_tree_pine": 32,
			"t_tree_maple": 32,
			"t_tree_willow": 32,
			"t_tree_hickory": 32,
			"t_tree_blackjack": 8,
			"t_tree_coffee": 8,
			"t_tree_apple": 2,
			"t_tree_apricot": 2,
			"t_tree_cherry": 2,
			"t_tree_peach": 2,
			"t_tree_pear": 2,
			"t_tree_plum": 2,
			"t_tree_deadpine": 1,
			"t_tree_hickory_dead": 1,
			"t_tree_dead": 1
		}
	},
	"shrubs_and_flowers": {
		"sequence": 1,
		"chance": 10,
		"clear_types": false,
		"types": {
			"t_underbrush": 8,
			"t_shrub_blueberry": 1,
			"t_shrub_strawberry": 1,
			"t_shrub": 1,
			"f_chamomile": 1,
			"f_dandelion": 1,
			"f_datura": 1,
			"f_dahlia": 1,
			"f_bluebell": 1,
			"f_mutpoppy": 1
		}
	}
}

Terrain Furniture

The terrain furniture are a collection of terrain ids with a chance of having furniture picked from a weighted list for that given terrain and placed on it during mapgen after the normal mapgen has completed. This is used, for example, to place cattails on fresh water in swamps. Cattails could be simply placed in the components section and placed during the normal forest mapgen, but that would not guarantee their placement on fresh water only, while this does.

Fields

Identifier Description
chance One in X chance that furniture from this component will be placed.
clear_furniture Clear all previously defined furniture for this terrain.
furniture Weighted list of furniture that will be placed on this terrain.

Example

{
	"t_water_sh" : {
		"chance": 2,
		"clear_furniture": false,
		"furniture": {
			"f_cattails": 1
		}
	}
}

Forest Trail Settings

The forest_trail_settings section defines the attributes used in generating trails in the forests, including their likelihood of spawning, their connectivity, their chance for spawning trailheads, and some general tuning of the actual trail width/position in mapgen.

Fields

Identifier Description
chance One in X chance a contiguous forest will have a trail system.
border_point_chance One in X chance that the N/S/E/W-most point of the forest will be part of the trail system.
minimum_forest_size Minimum contiguous forest size before a trail system can be spawned.
random_point_min Minimum # of random points from contiguous forest used to form trail system.
random_point_max Maximum # of random points from contiguous forest used to form trail system.
random_point_size_scalar Forest size is divided by this and added to the minimum number of random points.
trailhead_chance One in X chance a trailhead will spawn at end of trail near field.
trailhead_road_distance Maximum distance trailhead can be from a road and still be created.
trailheads Weighted list of overmap specials / city buildings that will be placed as trailheads.

Example

{
	"forest_trail_settings": {
		"chance": 2,
		"border_point_chance": 2,
		"minimum_forest_size": 100,
		"random_point_min": 4,
		"random_point_max": 50,
		"random_point_size_scalar": 100,
		"trailhead_chance": 1,
		"trailhead_road_distance": 6,
		"trailheads": {
			"trailhead_basic": 50
		}
	}
}

Forest Trail Settings

The overmap_connection_settings section defines the overmap_connection_ids used in hardcoded placement.

Fields

Identifier Description
intra_city_road_connection overmap_connection id used within cities. Should include locations for road and road_nesw_manhole.
inter_city_road_connection overmap_connection id used between cities. Should include locations for the intra city terrains.
trail_connection overmap_connection id used for forest trails.
sewer_connection overmap_connection id used for sewer connections.
subway_connection overmap_connection id used for for both z-2 and z-4 subway connections.
rail_connection overmap_connection id used for rail connections. ( Unused in vanilla as of 0.H )

Example

{
	"overmap_connection_settings": {
		"intra_city_road_connection": "cobbled_road",
		"inter_city_road_connection": "rural_road"
	}
}

City

The city section defines the possible overmap terrains and specials that may be used as buildings in a city, their weighted chances of placement, and some attributes that control the relative placements of various classes of buildings.

Fields

Identifier Description
type City type identifier–currently unused.
shop_radius Radial frequency of shop placement. Smaller number = more shops.
park_radius Radial frequency of park placement. Smaller number = more parks.
houses Weighted list of overmap terrains and specials used for houses.
parks Weighted list of overmap terrains and specials used for parks.
shops Weighted list of overmap terrains and specials used for shops.

Placing shops, parks, and houses

When picking a building to place in a given location, the game considers the city size, the location’s distance from the city center, and finally the shop_radius and park_radius values for the region. It then tries to place a shop, then a park, and finally a house, where the chance to place the shop or park are based on the formula rng( 0, 99 ) > X_radius * distance from city center / city size.

Example

{
	"city": {
		"type": "town",
		"shop_radius": 80,
		"park_radius": 90,
		"houses": {
			"house_two_story_basement": 1,
			"house": 1000,
			"house_base": 333,
			"emptyresidentiallot": 20
		},
		"parks": {
			"park": 4,
			"pool": 1
		},
		"shops": {
			"s_gas": 5,
			"s_pharm": 3,
			"s_grocery": 15
		}
	}
}

Map Extras

The map_extras section defines the named collections of map extras–special mapgen events applied on top of the defined mapgen–that may be referenced by the extras property of an overmap terrain. This includes both the chance of an extra occurring as well as the weighted list of extras.

Fields

Identifier Description
chance One in X chance that the overmap terrain will spawn a map extra.
extras Weighted list of map extras that can spawn.

Example

{
	"map_extras": {
		"field": {
			"chance": 90,
			"extras": {
				"mx_helicopter": 40,
				"mx_portal_in": 1
			}
		}
	}
}

Weather

The weather section defines the base weather attributes used for the region.

Fields

Identifier Description
base_temperature Base temperature for the region in degrees Celsius.
base_humidity Base humidity for the region in relative humidity %
base_pressure Base pressure for the region in millibars.
base_wind Base wind for the region in mph units. Roughly the yearly average.
base_wind_distrib_peaks How high the wind peaks can go. Higher values produce windier days.
base_wind_season_variation How the wind varies with season. Lower values produce more variation
weather_black_list Ids of weather types not allowed in this region.
weather_white_list Ids of the only weather types allowed in this region.

Example

{
	"weather": {
		"base_temperature": 6.5,
		"base_humidity": 66.0,
		"base_pressure": 1015.0,
		"base_wind": 5.7,
		"base_wind_distrib_peaks": 30,
		"base_wind_season_variation": 64,
		"weather_black_list": [
			"snowstorm"
    ]
  }
}

Overmap Feature Flag Settings

The overmap_feature_flag_settings section defines operations that operate on the flags assigned to overmap features. This is currently used to provide a mechanism for whitelisting and blacklisting locations on a per-region basis.

Fields

Identifier Description
clear_blacklist Clear all previously defined blacklist.
blacklist List of flags. Any location with a matching flag will be excluded from overmap generation.
clear_whitelist Clear all previously defined whitelist.
whitelist List of flags. Only locations with a matching flag will be included in overmap generation.

Example

{
	"overmap_feature_flag_settings": {
		"clear_blacklist": false,
		"blacklist": [ "FUNGAL" ],
		"clear_whitelist": false,
		"whitelist": []
	}
}

Region Overlay

A region_overlay allows the specification of region_settings values which will be applied to specified regions, merging with or overwriting the existing values. It is only necessary to specify those values which should be changed.

Fields

Identifier Description
type Type identifier. Must be “region_overlay”.
id Unique identifier for this region overlay.
regions A list of regions to which this overlay should be applied. “all” will apply to all regions.

All additional fields and sections are as defined for a region_overlay.

Example

[
	{
		"type": "region_overlay",
		"id": "example_overlay",
		"regions": [ "all" ],
		"city": {
			"parks": {
				"examplepark": 1
			}
		}
	}
]