Custom world generation/configured feature

• •  type: The ID of feature type.
  •  config: Configuration of this configured feature. The avialable properties vary depending on the  type. Types that are not listed below have no config, but must still have an empty config object.

If  type is bamboo:

• •  probability: The probability for a podzol disk to generate below the bamboo. The disk has a radius of 1 to 4 blocks. Value between 0.0 and 1.0 (inclusive).

If  type is basalt_columns:

• •  reach: The max radius of a column in this column cluster. Value between 0 and 3 (inclusive).
    • Int provider
  •  height: The max height is height + 1. Value between 1 and 10 (inclusive).
    • Int provider

If  type is block_column:

• •  direction: The direction of the column. One of up, down, north, east, south, or west.
  •  allowed_placement: A block predicate. The predicate must be passed to generate this feature.
    • Block predicate
  •  prioritize_tip: Determines where to cut off blocks when space is restricted. If true, will start removing layers from the start of the column.
  •  layers:(Can be empty) The layers of this column.
    • : A layer.
      •  height: Specifying the height of the layer. Must be a non-negative int.
        • Int provider
      •  provider: The block to use for this layer.
        • Block state provider

If  type is block_pile:

• •  state_provider: The block to use.
    • Block state provider

If  type is delta_feature:

• •  contents: The block to use on the inside of the delta.
    • Block state
  •  rim: The block to use for the rim of the delta.
    • Block state
  •  size: The size of the inside of the delta. Value between 0 and 16 (inclusive).
    • Int provider
  •  rim_size: The size of the rim of the delta. Value between 0 and 16 (inclusive).
    • Int provider

If  type is disk:

• •  state_provider: The block to use.
    •  fallback：The block to use when all the rules' predicates are not passed.
      • Block state provider
    •  rules: (Can be empty) Rules of the block to use.
      • : One rule.
        •  if_true: The predicate of this rule.
          • Block predicate
        •  then: The block to use when the predicate is passed.
          • Block state provider
  •  radius: The radius of this disk. Value between 0 and 8 (inclusive).
    • Int provider
  •  half_height: Half of the height of this disk. Value between 0 and 8 (inclusive).
  •  target: This predicate must be passed to generate this feature.
    • Block predicate

If  type is dripstone_cluster:

• •  floor_to_ceiling_search_range: For how many blocks the feature will search for the floor or ceiling. Value between 1 and 512 (inclusive).
  •  height: The height of the cluster. Value between 0 and 128 (inclusive).
    • Int provider
  •  radius: The radius of the cluster. Value between 0 and 128 (inclusive).
    • Int provider
  •  max_stalagmite_stalactite_height_diff: The maximum height difference between stalagmites and stalactites. Value between 0 and 64 (inclusive).
  •  height_deviation: The height deviation. Value between 1 and 64 (inclusive).
  •  dripstone_block_layer_thickness: The dripstone block layer's thickness. Value between 1 and 128 (inclusive).
    • Int provider
  •  density: Value between 0.0 and 2.0 (inclusive).
    • Float provider
  •  wetness: Value between 0.0 and 2.0 (inclusive).
    • Float provider
  •  chance_of_dripstone_column_at_max_distance_from_center: Value between 0.0 and 1.0 (inclusive).
  •  max_distance_from_edge_affecting_chance_of_dripstone_column: Value between 1 and 64 (inclusive).
  •  max_distance_from_center_affecting_height_bias: Value between 1 and 64 (inclusive).

If  type is end_gateway:

• •  exact: Whether the gateway should teleport entities in the exact exit position.
  •  exit: (optional) The block position where the gateway should exit.
    • : X coordinate.
    • : Y coordinate.
    • : Z coordinate.

If  type is end_spike:

• •  crystal_invulnerable: (optional, defaults to false) Whether the end crystals on it are invulnerable.
  •  crystal_beam_target: (optional) Block position of the beam target.
    • : The X coordinate.
    • : The Y coordinate.
    • : The Z coordinate.
  •  spikes: Configurations of each spike.
    • A spike.
      •  centerX: (optional, defaults to 0) The X coordinate.
      •  centerZ: (optional, defaults to 0) The Z coordinate.
      •  radius: (optional, defaults to 0) The radius of the spike.
      •  height: (optional, defaults to 0) The height of the spike.
      •  guarded: (optional, defaults to false) Whether to generate an iron bar cage around the crystal.

If  type is fill_layer:

• •  state: The block to fill with.
    • Block state
  •  height: The layers to fill, starting at the bottom of the world. Value between 0 and 4064 (inclusive).

If  type is flower, no_bonemeal_flower, orrandom_patch:

• •  tries: (optional, defaults to 128) The number of attempts to generate. Must be a positive integer.
  •  xz_spread: (optional, defaults to 7) The horizontal spread range. Must be a non-negative integer.
  •  y_spread: (optional, defaults to 3) the vertical spread range. Must be a non-negative integer.
  •  feature: Can be a placed feature ID, or a placed feature object. The placed feature that the this patch generates.

If  type is forest_rock:

• •  state: The block to use.
    • Block state

If  type is fossil:

• •  fossil_structures: A list of fossil structure templates to choose from.
    • : An ID of fossil structure template.
  •  overlay_structures: A list of overlay structure templates to choose from.
    • : An ID of overlay structure template.
  •  fossil_processors: Can be the ID of a processor list, or a list of processors, or a object of processor list. A processor for fossil structure templates.
  •  overlay_processors: Can be the ID of a processor list, or a list of processors, or a object of processor list. A processor for overlay structure templates.
  •  max_empty_corners_allowed: How many corners of the structure are allowed to be empty for it to generate. Prevents structures floating in the air.

If  type is geode:

• •  blocks: The blocks to use.
    •  filling_provider: The block used for filling.
      • Block state provider
    •  inner_layer_provider: The block of the inner layer.
      • Block state provider
    •  alternate_inner_layer_provider: The alternate block of the inner layer.
      • Block state provider
    •  middle_layer_provider: The block of the middle layer.
      • Block state provider
    •  outer_layer_provider: The block of the outer layer.
      • Block state provider
    •  inner_placements: The blocks to place in the geode.
      • A block state.
        • Block state
    •  cannot_replace: A block tag with # listing which blocks not to replace.
    •  invalid_blocks: A block tag with # listing invalid blocks. Due to a bug, any value is treated as minecraft:geode_invalid_blocks. Additionally, air is an invalid block.
  •  layers: The max radius of each layer. Higher value results in higher max radius of each layer.
    •  filling: (optional, defaults to 1.7) Value between 0.01 and 50 (inclusive).
    •  inner_layer: (optional, defaults to 2.2) Value between 0.01 and 50 (inclusive).
    •  middle_layer: (optional, defaults to 3.2) Value between 0.01 and 50 (inclusive).
    •  outer_layer: (optional, defaults to 4.2) Value between 0.01 and 50 (inclusive).
  •  crack: The configuration of the crack on the geode.
    •  generate_crack_chance: (optional, defaults to 1.0) The probability for generating crack. Value between 0.0 and 1.0 (inclusive).
    •  base_crack_size: (optional, efaults to 2) Value between 0.0 and 5.0 (inclusive).
    •  crack_point_offset: (optional,defaults to 2) Value between 0 and 10 (inclusive).
  •  noise_multiplier: (optional, defaults to 0.05) Value between 0.0 and 1.0 (inclusive).
  •  use_potential_placements_chance: (optional, defaults to 0.35) The probability for placing the inner placement on a block of inner layer. Value between 0 and 1 (inclusive).
  •  use_alternate_layer0_chance: (optional, defaults to 0.35) The probability of the alternate blocks on inner layer. Value between 0 and 1 (inclusive).
  •  placements_require_layer0_alternate: (optional, defaults to true) Whether the inner placements are only allowed on the alternate inner blocks.
  •  outer_wall_distance: (optional, defaults to a uniform int between 4 and 5) The offset on each coordinate of the center from the feature start. Value between 1 and 20 (inclusive).
    • Int provider
  •  distribution_points: (optional, defaults to a uniform int between 3 and 4) Value between 1 and 20 (inclusive).
    • Int provider
  •  invalid_blocks_threshold: Check distribution_points times near the center of the geode, and if the number of invalid blocks found exceeds this number, the feature will not be generated.
  •  point_offset: (optional, defaults to a uniform int between 1 and 2) Value between 1 and 10.
    • Int provider
  •  min_gen_offset: (optional, defaults to -16) The minimum Chebyshev distance between the block and the center.
  •  max_gen_offset: (optional, defaults to 16) The maximum Chebyshev distance between the block and the center.

If  type is huge_brown_mushroom or huge_red_mushroom:

• •  cap_provider: The block to use for the cap.
    • Block state provider
  •  stem_provider: The block to use for the stem.
    • Block state provider
  •  foliage_radius: (optional，defaults to 2) The size of the cap.

If  type is huge_fungus:

• •  hat_state: The block to use for the hat.
    • Block state
  •  decor_state: The block to use as decoration.
    • Block state
  •  stem_state: The block to use for the stem.
    • Block state
  •  valid_base_block: The block to place this feature on.
    • Block state
  •  planted: (optional, defaults to false) Whether this huge fungus is planted. If false, it can't exceed the world ceiling, can replace blocks whose material is PLANT, and doesn't drop items when replace other blocks.

If  type is iceberg:

• •  state: The block to use.
    • Block state

If  type is lake:

• •  fluid: The block to use for the fluid of the lake.
    • Block state provider
  •  barrier: The block to use for the barrier of the lake.
    • Block state provider

If  type is large_dripstone:

• •  floor_to_ceiling_search_range: (optional, defaults to 30) The search range form start point to cave floor or ceiling (rather than from floor to ceiling). Value between 1 and 512 (inclusive).
  •  column_radius: Used to provider a min and max value for radius. Note that this int provider doesn't provider a single int, but provider the min and max value of the specified distribution. Value between 1 and 60 (inclusive). See the graph for details.
    • Int provider
  •  height_scale: Higher value leads to higher height. Value between 0.0 and 20.0 (inclusive).
    • Float provider
  •  max_column_radius_to_cave_height_ratio: The ratio of the max radius to the height of the cave. Value between 0.0 and 1.0 (inclusive).
  •  stalactite_bluntness: Trancate the tip of stalactite. Higher value leads to lower height. Value between 0.1 and 10.0 (inclusive).
    • Float provider
  •  stalagmite_bluntness: Trancate the tip of stalagmite. Higher value leads to lower height. Value between 0.1 and 10.0 (inclusive).
    • Float provider
  •  wind_speed: Larger value results in larger inclination. Value between 0.0 and 2.0 (inclusive).
    • Float provider
  •  min_radius_for_wind: The min column radius to used the wind. Value between 0 and 100.
  •  min_bluntness_for_wind: The min value of the bluntnesses to used the wind. Value between 0.0 and 5.0 (inclusive).

If  type is multiface_growth:

• •  block: (optional, defaults to glow_lichen) The block to place, currently must be glow_lichen or sculk_vein.
  •  search_range: (optional, defaults to 10) Value between 1 and 64 (inclusive).
  •  chance_of_spreading: (optional, defaults to 0.5) Value between 0.0 and 1.0 (inclusive).
  •  can_place_on_floor: (optional, defaults to false).
  •  can_place_on_ceiling: (optional, defaults to false).
  •  can_place_on_wall: (optional, defaults to false).
  •  can_be_placed_on: Can be a block ID or a block tag, or a list of block IDs.

If  type is nether_forest_vegetation:

• •  state_provider: The block to use.
    • Block state provider
  •  spread_width: The horizonal distance to spread to. The max width is spread_width * 2 -1. Must be a positive integer.
  •  spread_height: The vertical distance to spread. The max height is spread_height * 2 -1. Must be a positive integer.

If  type is netherrack_replace_blobs:

• •  state: The block to use.
    • Block state
  •  target: The block to replace.
    • Block state
  •  radius: Value between 0 and 12 (inclusive).
    • Int provider

If  type is ore or scattered_ore:

• •  size: Value between 0 and 64 (inclusive). Determine the volume size of the ore.
  •  discard_chance_on_air_exposure: Value between 0 and 1 (inclusive). The chance for an ore block to be discarded when it is exposed to air. Setting this to 1 makes the ore completely hidden.
  •  targets: A list of targets.
    • : A target.
      •  target: Rule test. The blocks to replace.
        • A rule test
      •  state: The block to use.
        • Block state

If  type is pointed_dripstone:

• •  chance_of_taller_dripstone: (optional, defaults to 0.2) Value between 0.0 and 1.0 (inclusive).
  •  chance_of_directional_spread: (optional, defaults to 0.7) Value between 0.0 and 1.0 (inclusive). Probability that the dripstone spreads in a horizontal direction.
  •  chance_of_spread_radius2: (optional, defaults to 0.5) Value between 0.0 and 1.0 (inclusive). Probability of horizontal spread by two blocks.
  •  chance_of_spread_radius3: (optional. defaults to 0.5) Value between 0.0 and 1.0 (inclusive). After the spread by two blocks, probability of spreading the third block.

If  type is random_boolean_selector:

• •  feature_false: One placed feature. Can be an ID of a placed feature, or a placed feature object.
  •  feature_true: Another placed feature. Can be an ID of a placed feature, or a placed feature object.

If  type is random_selector:

• •  features: A list of placed features from which to randomly choose. Try in order from top to bottom, generate the placed feature or try the next one according to the chance.
    • A feature and its corresponding chance.
      •  feature: The placed feature to use. Can be an ID of a placed feature, or a placed feature object.
      •  chance: The chance of this feature being chosen.
  •  default: The placed feature to use if none of the above features are chosen. Can be an ID of a placed feature, or a placed feature object.

If  type is replace_single_block:

• •  targets: A list of targets.
    • : A target.
      •  target: Rule test. The blocks to replace.
        • A rule test
      •  state: The block to use.
        • Block state

If  type is root_system:

• •  required_vertical_space_for_tree: Value between 1 and 64 (inclusive).
  •  root_radius: Value between 1 and 64 (inclusive).
  •  root_placement_attempts: Value between 1 and 256 (inclusive).
  •  root_column_max_height: Value between 1 and 4096 (inclusive).
  •  hanging_root_radius: Value between 1 and 64 (inclusive).
  •  hanging_roots_vertical_span: Value between 1 and 16 (inclusive).
  •  hanging_root_placement_attempts: Value between 1 and 256 (inclusive).
  •  allowed_vertical_water_for_tree: Value between 1 and 64 (inclusive).
  •  root_replaceable: A block tag with # specifying which blocks can be replaced by the root column.
  •  root_state_provider: The block to use for the root column.
    • Block state provider
  •  hanging_root_state_provider: The block to use hanging below the root column.
    • Block state provider
  •  allowed_tree_position: The block predicate used to check if the tree position is valid.
    • Block predicate
  •  feature: The placed feature to place on top of the root system. Can be an ID of a placed feature, or a placed feature object.

If  type is sculk_patch:

• •  charge_count: The number of charges. Value between 1 and 32 (inclusive).
  •  amount_per_charge: The initial value of each charge. Value between 1 and 500 (inclusive).
  •  spread_attempts: The number of attempts to spread. Value between 1 and 64 (inclusive).
  •  growth_rounds: The number of times to generate. Value between 0 and 8 (inclusive).
  •  spread_rounds: The number of times to spread. Value between 0 and 8 (inclusive).
  •  extra_rare_growths: The number of extra shriekers generated.
    • Int provider
  •  catalyst_chance: The probability of generating a catalyst. Value between 0.0 and 1.0 (inclusive).

If  type is sea_pickle:

• •  count: Value between 0 and 256 (inclusive). The max count of the sea pickle block (not single sea pickle).
    • Int provider

If  type is seagrass:

• •  probability: Value between 0.0 and 1.0 (inclusive). Probability of using tall seagrass instead of seagrass

If  type is simple_block:

• •  to_place: The block to use.
    • Block state provider

If  type is simple_random_selector:

• •  features: Features to choose from. Can be an ID or a tag of a placed feature, or a list of placed feature IDs.

If  type is spring_feature:

• •  state: The fluid to use.
    • Block state
  •  rock_count: (optional, defaults to 4) The required number of blocks adjacent to the spring that belong to valid_blocks.
  •  hole_count: (optional, defaults to 1) The required number of air blocks adjacent to the spring.
  •  requires_block_below: (optional, defaults to true) Whether the spring feature requires a block in  valid_blocks below the fluid.
  •  valid_blocks: Can be a block ID or a block tag, or a list of block IDs.

If  type is tree:

• •  ignore_vines: (optional, defaults to false) Allows the tree to generate even if there are vines blocking it.
  •  force_dirt: (optional, defaults to false) If true, will place the dirt provider even when the block below the tree is a valid dirt-like block.
  •  dirt_provider: The block to place below the trunk. Only places if force_dirt is true, or if there is not a valid dirt-like block below the trunk.
    • Block state provider
  •  trunk_provider: The block to use for the trunk. Note that when the trunk placer is fancy_trunk_placer, the block must have axis property, such as logs.
    • Block state provider
  •  foliage_provider: The block to use for the foliage.
    • Block state provider
  •  minimum_size: Defines the width of the tree at different heights relative to the lowest trunk block, for the minimum size of the feature.
    •  min_clipped_height: (optional) Value between 0 and 80 (inclusive). If the possible height at this location is lower than trunk height, but greater or equal to this value, the tree will generate anyway. If not specified, the tree won't generate as long as the possible height is lower than trunk height.

If the possible height at this location is lower than this value, the tree cannot generate.

• • •  type: One of two_layers_feature_size or three_layers_feature_size

      If type is two_layers_feature_size, additional fields are as follows:

    •  limit: (optional, defaults to 1) Value between 0 and 81 (inclusive). At heights lower than this value, lower_size is used, otherwise upper_size.
    •  lower_size: (optional, defaults to 0) Value between 0 and 16 (inclusive). Minimum width of the tree at heights under limit.
    •  upper_size: (optional, defaults to 1) Value between 0 and 16 (inclusive). Minimum width of the tree at heights greater than or equals limit.

      If type is three_layers_feature_size, additional fields are as follows:

    •  limit: (optional, defaults to 1) Value between 0 and 80 (inclusive). At heights lower than this value, lower_size is used, otherwise upper_size or middle_size.
    •  upper_limit: (optional, defaults to 1) Value between 0 and 80 (inclusive). At heights between this and limit, middle_size is used. If the height is greater or equals, it will use upper_size.
    •  lower_size: (optional. defaults to 0) Value between 0 and 16 (inclusive). Minimum width of the tree at the lowest layer.
    •  middle_size: (optional, defaults to 1) Value between 0 and 16 (inclusive). Minimum width of the tree at the middle layer.
    •  upper_size: (optional, defaults to 1) Value between 0 and 16 (inclusive). Minimum width of the tree at the upper layer.
  •  root_placer: (optional) Controls how tree's roots are generated.
    •  type: Type of tree root placer, currently only mangrove_root_placer.
    •  root_provider: The block used as the root of the tree.
      • Block state provider
    •  trunk_offset_y: Offset perpendicular to the trunk.
      • Int provider
    •  above_root_placement: (optional) The blocks above the root.
      •  above_root_provider: The block above the root.
        • Block state provider
      •  above_root_placement_chance: The probability of generating the block. Value between 0.0 and 1.0 (inclusive).

      If type is mangrove_root_placer, additional fields are as follows:

    •  mangrove_root_placement: Mangrove root placement parameter.
      •  max_root_width: The maximum width of the root. Value between 1 and 12 (inclusive).
      •  max_root_length: The maximum length of the root. Value between 1 and 64 (inclusive).
      •  random_skew_chance: The probability of random skew. Value between 0.0 and 1.0 (inclusive).
      •  can_grow_through: A block ID or a block tag, or a list of block IDs. Blocks that roots can grow through.
      •  muddy_roots_in: A block ID or a block tag, or a list of block IDs. Roots in it will turn into muddy root blocks.
      •  muddy_roots_provider: Blocks used as muddy roots.
        • Block state provider
  •  trunk_placer:
    •  base_height: Value between 0 and 32 (inclusive).
    •  height_rand_a: Value between 0 and 24 (inclusive).
    •  height_rand_b: Value between 0 and 24 (inclusive).
    •  type: One of straight_trunk_placer, forking_trunk_placer, giant_trunk_placer, mega_jungle_trunk_placer, dark_oak_trunk_placer, fancy_trunk_placer, bending_trunk_placer, or upwards_branching_trunk_placer.

      If type is bending_trunk_placer, additional fields are as follows:

    •  bend_length: Value between 1 and 64 (inclusive).
      • Int provider
    •  min_height_for_leaves: (optional, defaults to 1) Must be a positive integer.

      If type is upwards_branching_trunk_placer, additional fields are as follows:

    •  extra_branch_steps: The number of steps to generate extra branches. Must be a positive integer.
      • Int provider
    •  extra_branch_length: Generates extra branch length. Must be a non-negative integer.
      • Int provider
    •  place_branch_per_log_probability: The probability of each log producing a branch. Value between 0.0 and 1.0 (inclusive).
    •  can_grow_through: A block ID or a block tag, or a list of block IDs. Represents blocks that tree trunks can grow through.
  •  foliage_placer:
    •  radius: The radius of the foliage.
      • Int provider
    •  offset: The vertical offest from the top of trunk to the top of the foliage.
      • Int provider
    •  type: One of blob_foliage_placer, spruce_foliage_placer, pine_foliage_placer, acacia_foliage_placer, bush_foliage_placer, fancy_foliage_placer, jungle_foliage_placer, mega_pine_foliage_placer, dark_oak_foliage_placer, or random_spread_foliage_placer.

      If type is blob_foliage_placer, bush_foliage_placer, fancy_foliage_placer, or jungle_foliage_placer, the additional fields are as follows

    •  height: The foliage's height. Value between 0 and 16 (inclusive).

      If type is spruce_foliage_placer, the additional fields are as follows

    •  trunk_height: Value between 0 and 24 (inclusive).
      • Int provider

      If type is pine_foliage_placer, the additional fields are as follows

    •  height: Value between 0 and 24 (inclusive).
      • Int provider

      If type is mega_pine_foliage_placer, the additional fields are as follows

    •  crown_height: Value between 0 and 24 (inclusive).
      • Int provider

      If type is random_spread_foliage_placer, the additional fields are as follows

    •  foliage_height: Value between 1 and 512 (inclusive).
      • Int provider
    •  leaf_placement_attempts: Value between 0 and 256 (inclusive).
  •  decorators: (Required, but can be empty) Decorations to add to the tree apart from the trunk and leaves.
    • : A decorator.
      •  type: The type of decoration to add. One of trunk_vine, leave_vine, cocoa, beehive, alter_ground, or attached_to_leaves.

        If type is leave_vine, cocoa or beehive, additional fields are as follows:

      •  probability: Value between 0.0 and 1.0 (inclusive).

        If type is alter_ground, additional fields are as follows:

      •  provider: The block to replace the ground with.
        • Block state provider

        If type is attached_to_leaves, additional fields are as follows:

      •  probability: Value between 0.0 and 1.0 (inclusive).
      •  exclusion_radius_xz: The minimum value of the horizontal distance between two decorations. Value between 0 and 16 (inclusive).
      •  exclusion_radius_y: The minimum value of the vertical distance between two decorations. Value between 0 and 16 (inclusive).
      •  required_empty_blocks: The number of empty blocks required by the decoration. Value between 0 and 16 (inclusive).
      •  block_provider: The block of the decoration.
        • Block state provider
      •  directions: (Cannot be empty) Directions to generate.
        • : A direction. Must be up, down, north, south , west, or east.

If  type is twisting_vines:

• •  spread_width: Must be a positive integer. The max spread width is spread_width * 2 + 1
  •  spread_height: Must be a positive integer. The max spread height is spread_height * 2 + 1
  •  max_height: Must be a positive integer. The max length is max_lenght * 2, and the min length is 1.

If  type is underwater_magma:

• •  floor_search_range: Value between 0 and 512 (inclusive).
  •  placement_radius_around_floor: Value between 0 and 64 (inclusive).
  •  placement_probability_per_valid_position: Value between 0.0 and 1.0 (inclusive).

If  type is vegetation_patch or waterlogged_vegetation_patch:

• •  surface: The surface to place on. One of floor, or ceiling
  •  depth: Value between 1 and 128 (inclusive).
    • Int provider
  •  vertical_range: Value between 1 and 256 (inclusive).
  •  extra_bottom_block_chance: Value between 0.0 and 1.0 (inclusive).
  •  extra_edge_column_chance: Value between 0.0 and 1.0 (inclusive).
  •  vegetation_chance: Value between 0.0 and 1.0 (inclusive). The chance that a vegetation feature will be placed, is evaluated for each block.
  •  xz_radius: The radius of the patch.
    • Int provider
  •  replaceable: A block tag with # specifying what blocks this feature can replace.
  •  ground_state: The block to use for the ground of the patch.
    • Block state provider
  •  vegetation_feature: The placed feature to place on top of the patch. Can be a placed feature ID, or a placed feature object.