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Underwater magma feature

The underwater_magma feature can be used to generate magma blocks underwater.

Configuration

The underwater_magma feature has the following configuration options:

Option Type Description
floor_search_range An int. (Range limit in Json is \([0;512]\)) The maximum y-distance from the origin Blockpos of the feature to search for a floor.
placement_radius_around_floor An int. (Range limit in Json is \([0;64]\)) The radius around the floor to place magma blocks.
placement_probability_per_valid_position A float. (Range limit in Json is \([0.0;1.0]\)) The probability that a magma block will be placed at a valid position.

In code, the UnderwaterMagmaConfiguration class is used to configure the feature.

Example

As an example, here's the placed and configured feature used to place magma blocks in underwater caves:

ConfiguredFeatures.kt
val UNDERWATER_MAGMA = FeatureRegistry.registerConfiguredFeature(
    Machines,
    "underwater_magma",
    Feature.UNDERWATER_MAGMA,
    UnderwaterMagmaConfiguration(
        5, // floor_search_range
        1, // placement_radius_around_floor
        0.5F // placement_probability_per_valid_position
    )
)

val UNDERWATER_MAGMA = FeatureRegistry.registerPlacedFeature(
    Machines,
    "underwater_magma",
    Configurations.UNDERWATER_MAGMA,
    listOf(
        CountPlacement.of(UniformInt.of(44, 52)), // (1)!
        InSquarePlacement.spread(), // (2)!
        PlacementUtils.RANGE_BOTTOM_TO_MAX_TERRAIN_HEIGHT, // (3)!
        SurfaceRelativeThresholdFilter.of(Heightmap.Types.OCEAN_FLOOR_WG, Int.MIN_VALUE, -2), // (4)!
        BiomeFilter.biome() // (5)!
    )
)
  1. Random amount between 44 and 52.
  2. Randomly spread the blocks horizontally.
  3. Constant for 
    HeightRangePlacement.uniform(VerticalAnchor.bottom(), VerticalAnchor.absolute(256))
  4. Only place the feature if it's at least 2 blocks below the ocean floor.
  5. Only place the feature in biomes that have underwater magma.
configured_feature/underwater_magma.json
{
   "type": "minecraft:underwater_magma",
   "config": {
      "floor_search_range": 5,
      "placement_probability_per_valid_position": 0.5,
      "placement_radius_around_floor": 1
   }
}
placed_feature/underwater_magma.json
{
   "feature": "minecraft:underwater_magma",
   "placement": [
      {
         "type": "minecraft:count", // (1)!
         "count": {
            "type": "minecraft:uniform",
            "value": {
               "max_inclusive": 52,
               "min_inclusive": 44
            }
         }
      },
      {
         "type": "minecraft:in_square" // (2)!
      },
      {
         "type": "minecraft:height_range", // (3)!
         "height": {
            "type": "minecraft:uniform",
            "max_inclusive": {
               "absolute": 256
            },
            "min_inclusive": {
               "above_bottom": 0
            }
         }
      },
      {
         "type": "minecraft:surface_relative_threshold_filter", // (4)!
         "heightmap": "OCEAN_FLOOR_WG",
         "max_inclusive": -2
      },
      {
         "type": "minecraft:biome" // (5)!
      }
   ]
}
  1. Random amount between 44 and 52.
  2. Randomly spread the blocks horizontally.
  3. Constant for 
    HeightRangePlacement.uniform(VerticalAnchor.bottom(), VerticalAnchor.absolute(256))
  4. Only place the feature if it's at least 2 blocks below the ocean floor.
  5. Only place the feature in biomes that have underwater magma.

Result

Example