---
title: "Torus land: API"
package: "@phaser-ae/torus-land"
tier: Pro
version: 3.0.0-0
released: 2026-10-19
updated: 2026-10-19
description: "A seeded landscape over a sea that wraps at every edge, with ground queries for the rules and earthquakes, volcanoes and craters that reshape it in play."
url: https://phaser.io/packs/torus-land/api
site: Phaser - https://phaser.io
---

# Torus land: API

`@phaser-ae/torus-land` — A wrapping heightfield world over a sea: seeded landforms that tile the torus, ground queries, brush edits, and earthquakes, volcanoes and craters over time.

## The pack

### `torusLand`

```ts
function torusLand(): Pack<{ torusLand: typeof api }>
```

Install the torus-land API (`game.torusLand`).

## Helpers

### `advanceShaping`

```ts
function advanceShaping(list: Shaping[], land: Land, dt: number): Shaping[]
```

Advance every shaping by `dt`, applying its change to the land; returns those still running.

### `LAND_SHAPES`

```ts
const LAND_SHAPES: readonly LandShape[]
```

Built-in landform generators, all periodic over the torus.

### `landShapeFn`

```ts
function landShapeFn(shape: LandShape, seed: number, size: number, featureSize: number): (x: number, z: number) => number
```

A periodic landform function for a shape: world x/z in, a normalised 0..1 height out. `cells` lattice cells span
the world (rounded from the feature size), which is the noise's period, so the land meets itself at the seam.

### `shapingField`

```ts
function shapingField(s: Shaping, t: number, dx: number, dz: number): number
```

The displacement a shaping has made by time `t` at an offset from its centre. Quake: rolling waves that heave the
ground up and down while it lasts and leave it permanently broken into ridges and hollows. Volcano: a cone that
grows from the ground with a crater in its top. Raise: a smooth mound (or a hollow when `amount` is negative).

## Classes

### `Land`

```ts
class Land
```

The land: heights, sea, queries and live reshaping.

- `readonly field: Heightfield` — The heights (shared with the renderer by reference).
- `readonly size: number` — World units a side (the torus period).
- `readonly cell: number` — World units per grid cell.
- `readonly cells: number` — Grid cells a side.
- `readonly sea: number` — The sea's level (world y).
- `readonly floor: number` — Lowest a sample may be pushed (the sea bed floor).
- `readonly ceiling: number` — Highest a sample may be pushed.
- `constructor(def: LandDef)`
- `delta(a: number, b: number): number` — The torus offset from a to b on one axis (shortest way round).
- `wrap(v: number): number` — A coordinate brought into [-size/2, size/2).
- `distance(ax: number, az: number, bx: number, bz: number): number` — Horizontal distance across the torus.
- `heightAt(x: number, z: number): number` — The land's height (the sea bed under water).
- `groundAt(x: number, z: number): number` — What a flyer or a walker meets: the land, or the sea's surface over water.
- `isWater(x: number, z: number): boolean` — Is this point over water.
- `relief(x: number, z: number, radius: number): number` — Relief (max - min height) over a square footprint of `radius`, sampled at cell spacing; Infinity over water.
- `normalAt(x: number, z: number): { x: number; y: number; z: number }` — The surface normal (for tilting things that stand on it).
- `edit(edits: readonly TerrainEdit[]): void` — Apply terrain-3d brush edits (raise, flatten, landform...) at world points; heights stay inside floor..ceiling.
- `displace(x: number, z: number, radius: number, fn: (dx: number, dz: number) => number): void` — Add a displacement field over a disc: `fn(dx, dz)` returns the change at an offset from the centre (world units). Used for the time-varying spells (an earthquake's heave, a volcano's cone growing).
- `each(x: number, z: number, radius: number, visit: (index: number, dx: number, dz: number) => void): void` — Visit every grid sample within `radius` of a point (wrapped), with its offset from the point.
- `mark(minX: number, minZ: number, maxX: number, maxZ: number): void` — Record a changed region for the renderer.
- `takeDirty(): DirtyRect[]` — The regions changed since the last call (merged per step by the caller).
- `heights(): Float32Array` — The heights, for a snapshot.
- `setHeights(h: Float32Array): void` — Restore heights from a snapshot (marks the whole world dirty).

## Types

### `DirtyRect`

```ts
interface DirtyRect
```

A world rectangle whose heights changed (it may run past the edge of the torus; it wraps).

- `minX: number` — Left edge in world x; may be below -size/2, in which case the region wraps.
- `minZ: number` — Near edge in world z; may be below -size/2, in which case the region wraps.
- `maxX: number` — Right edge in world x; may pass size/2, in which case the region wraps.
- `maxZ: number` — Far edge in world z; may pass size/2, in which case the region wraps.

### `LandDef`

```ts
interface LandDef
```

How a world's land is made.

- `cells: number` — Grid cells (tiles) a side; the world is a torus this many tiles round.
- `cell: number` — World units per tile.
- `sea?: number` — The sea's level (world y). Default 0.
- `height: number` — How high the highest land stands above the sea (world units).
- `seaDepth?: number` — How deep the sea bed falls below the sea (world units). Default 0.35 x height.
- `featureSize?: number` — World units per large landform feature (rounded so a whole number tile the torus). Default size / 6.
- `landFraction?: number` — The fraction of the world that stands above the sea, 0..1. Default 0.45.
- `shape?: LandShape | ((x: number, z: number) => number)` — A built-in landform or your own periodic function (x, z) -> 0..1 that repeats every `cells * cell`.
- `seed: number` — The landform seed.

### `LandShape`

```ts
type LandShape = "archipelago" | "continent" | "highlands" | "lagoon" | "flat"
```

A built-in landform (all tile the torus).

### `Shaping`

```ts
interface Shaping
```

A land-shaping effect in progress.

- `kind: "quake" | "volcano" | "raise" | "crater"` — Which effect: `'quake'` heaves and cracks a belt, `'volcano'` grows a cone, `'raise'` lifts or lowers a disc, `'crater'` digs a bowl.
- `x: number` — World x of the centre, in world units.
- `z: number` — World z of the centre, in world units.
- `radius: number` — Radius of the affected disc (world units); for a quake, the half-width of its belt.
- `dirX: number` — A quake's line: unit direction and length (world units), centred on x/z. 0 for a disc.
- `dirZ: number` — A quake's belt direction, z component of a unit vector; 0 for a disc.
- `length: number` — A quake belt's length in world units, centred on x/z; 0 for a disc.
- `t: number` — Seconds since it began.
- `duration: number` — How long it lasts (seconds).
- `amount: number` — Peak height change (world units; negative lowers for `raise`).
- `seed: number` — Noise seed (the quake's cracks).
- `owner: number` — Who cast it (an owner id), or -1.

---

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