Module placement 

Structure placement. Determines which chunks are valid for structure generation — vanilla’s StructurePlacement hierarchy.

Structs

ExclusionZone

Vanilla’s StructurePlacement.ExclusionZone.

StructurePlacement

Structure placement configuration.

StructureSelectionEntry

A weighted entry in a structure set.

StructureSet

Vanilla’s StructureSet: weighted structures + one placement.

Enums

FrequencyReductionMethod

Vanilla’s StructurePlacement.FrequencyReductionMethod. Variants differ in seeding/RNG strategy for historical compatibility.

PlacementKind

Kind-specific placement parameters.

SpreadType

How structures are spread within their grid cell. Vanilla’s RandomSpreadType.

Constants

PARALLEL_RING_SNAP_THRESHOLD 🔒

Functions

convert_structure_set 🔒

generate_ring_positions

Vanilla’s ChunkGeneratorStructureState.generateRingPositions. Positions in chunk coords. If snap_biome is provided it gets (block_x, block_z, &mut rng) and returns Some((snapped_block_x, snapped_block_z)) to snap, or None to keep raw.

java_round 🔒

Java’s Math.round(double) — half-up toward +∞. Rust’s f64::round() rounds -0.5 → -1; Java rounds -0.5 → 0.

load_vanilla_structure_sets

Loads all vanilla structure sets from the generated registry data.