World

Block-keyed maps that change what happens to the world. The overview explains the file format. For what fallout does to blocks, see Fallout transform.

erosion

data/hbm/value_maps/block/erosion.json. Registry: block. HBM ships 4 entries.

Value: a block id. What an eroding blast (the drill missile) leaves of the block.

{
  "values": {
    "hbm:concrete": "minecraft:gravel",
    "hbm:concrete_smooth": "minecraft:gravel",
    "hbm:brick_concrete": "hbm:brick_concrete_broken",
    "hbm:brick_concrete_broken": "minecraft:gravel"
  }
}

radiation_decay

data/hbm/value_maps/block/radiation_decay.json. Registry: block. HBM ships no entries.

How radiation decays the surface blocks of a heavily irradiated area (1.7’s RadiationWorldHandler.decayBlock). HBM’s own rules for grass blocks, grass and ferns, double plants and leaves stay in code. A block named in this map follows its value instead.

Field	Type	Default	Meaning
`to`	block state string	required	The block it becomes: an id, or an id with properties (`"minecraft:oak_log[axis=y]"`). `""` means the block does not decay.
`chance`	float	`1.0`	Chance (0 to 1) to become `to`; otherwise it becomes air.

{
  "values": {
    "minecraft:moss_block": { "to": "minecraft:dirt", "chance": 0.5 },
    "#minecraft:leaves": { "to": "" }
  }
}

fluid_deposit

data/hbm/value_maps/block/fluid_deposit.json. Registry: block. HBM ships 2 entries.

The deposit blocks the oil drills (oil derrick, pumpjack, fracking tower) draw from. Each drill keeps its own 1.7 amounts; a deposit names its fluids and scales those amounts.

Field	Type	Default	Meaning
`primary`	fluid id	required	Fills the drill’s first tank.
`secondary`	fluid id	`minecraft:empty`	Fills the second tank. `minecraft:empty` for none.
`empty`	block id	none	The block a drained deposit becomes. Absent: it never drains.
`yield`	double	`1`	Scales the drill’s primary amount.
`secondary_yield`	double	`yield`	Scales the drill’s secondary amount.
`drain`	double	`1`	Scales the drill’s chance to drain the deposit.
`fracking_only`	boolean	`false`	Only the fracking tower reaches it.

Drills search through drained deposit blocks (any block named as an empty) to find live ones.

{
  "values": {
    "hbm:ore_oil": { "primary": "hbm:oil", "secondary": "hbm:gas", "empty": "hbm:ore_oil_empty" },
    "hbm:ore_bedrock_oil": { "primary": "hbm:oil", "secondary": "hbm:gas", "yield": 0.1, "fracking_only": true }
  }
}

A deposit can hold any fluid. For a brine deposit block from another mod:

{
  "values": {
    "othermod:brine_deposit": { "primary": "othermod:brine", "empty": "minecraft:stone", "yield": 0.5 }
  }
}

fluid_deposit_states

data/hbm/value_maps/block/fluid_deposit_states.json. Registry: block. HBM ships no entries.

Deposits that differ by one block state property of a single block. A block with an entry here is looked up by its state first; a property value without an entry falls back to fluid_deposit.

Field	Type	Meaning
`property`	string	The block state property name.
`values`	object	Property value name to a fluid_deposit value.

A drained deposit keeps every property its empty block shares with it by name.

{
  "values": {
    "othermod:planet_oil": {
      "property": "body",
      "values": {
        "duna": { "primary": "hbm:oil", "secondary": "hbm:gas", "empty": "othermod:planet_oil_empty" },
        "eve": { "primary": "hbm:gas", "empty": "othermod:planet_oil_empty", "yield": 2.0 }
      }
    }
  }
}