Struct OverworldClimateSampler 

pub struct OverworldClimateSampler {
    noises: Box<OverworldNoises>,
}

Climate sampler for the overworld using compiled density functions.

Evaluates the overworld noise router (temperature, vegetation, continentalness, erosion, depth, ridges) to produce TargetPoint values for biome lookup.

Fields

noises: Box<OverworldNoises>

All noise generators needed by the overworld density functions. Boxed because OverworldNoises is ~5600 bytes (35 NormalNoise fields).

Implementations

impl OverworldClimateSampler

pub fn new(seed: u64) -> Self

Create a new overworld climate sampler with the given seed.

pub fn sample( &self, quart_x: i32, quart_y: i32, quart_z: i32, cache: &mut OverworldColumnCache, ) -> TargetPoint

Sample climate at a quart position.

The cache holds column-level (xz-only) precomputed values. It should persist across calls for the same chunk to avoid redundant noise evaluations when only y changes.

pub fn init_column_grid( &self, cache: &mut OverworldColumnCache, chunk_block_x: i32, chunk_block_z: i32, )

Pre-populate a column cache’s flat-noise grid for a chunk’s quart columns.

The biome stage samples every quart cell in a chunk (1536 for the overworld) in section → x → y → z order. Without a grid, the cache is a single-entry lazy cache that misses on every cell (the innermost z loop changes column each step), so the expensive flat (xz-only) climate noise is recomputed per cell. Pre-computing the grid once — exactly as the noise stage’s fill_from_noise does — turns those into O(1) lookups. Bit-identical because the grid evaluates the same functions at the same quart coordinates.

pub fn find_spawn_position(&self) -> BlockPos

Finds the climate-biased overworld spawn origin.

This mirrors vanilla’s Climate.Sampler.findSpawnPosition() with OverworldBiomeBuilder.spawnTarget().

fn radial_spawn_search( &self, spawn_targets: &[ParameterPoint; 2], result: SpawnSearchResult, max_radius: f32, radius_increment: f32, ) -> SpawnSearchResult

fn spawn_position_and_fitness( &self, spawn_targets: &[ParameterPoint; 2], block_x: i32, block_z: i32, ) -> SpawnSearchResult