--- title: "Voxel World: API" package: "@phaser-ae/voxels-3d" tier: Free version: 3.0.0-4 released: 2026-10-14 updated: 2026-10-20 description: "A bounded block world you can mine, build in and walk through, with chunked meshing, baked ambient occlusion, generated textures, a block raycast and a character body." url: https://phaser.io/packs/voxels-3d/api site: Phaser - https://phaser.io --- # Voxel World: API `@phaser-ae/voxels-3d` — A block world: chunked, exposed-face meshed with baked AO, raycast-pickable and editable, as in games like Minecraft. ## The pack ### `voxels3d` ```ts function voxels3d(opts: Voxels3dOptions = {}): Pack<{ voxels: Voxels3dApi }> ``` The `voxels-3d` pack: a chunked block volume with a procedural texture pack, exposed-face meshing with baked ambient occlusion, a DDA raycast and a character controller. Requires a 3D world and `render-3d`. ## Helpers ### `BLOCK` ```ts const BLOCK: { readonly air: 0; readonly grass: 1; readonly dirt: 2; readonly stone: 3; readonly cobble: 4; readonly sand: 5; readonly log: 6; readonly planks: 7; readonly leaves: 8; readonly water: 9; readonly snow: 10; readonly glass: 11; readonly brick: 12; readonly coalOre: 13; readonly goldOre: 14; readonly gravel: 15; readonly bedrock: 16; } ``` Named ids so callers read `BLOCK.grass` not a magic number. ### `BLOCKS` ```ts const BLOCKS: (BlockDef | null)[] ``` The block table. `BLOCKS[id]` — id 0 (air) is intentionally a hole. ## Functions ### `bakeTiles` ```ts function bakeTiles(res = 16, seed = 1): { data: Uint8Array; layers: number; res: number } ``` Bake the whole pack: `count` layers of `res*res` RGBA, contiguous. Pure. ### `faceTile` ```ts function faceTile(def: BlockDef, face: number): number ``` Pick the per-face tile layer for a block + face index (0..5, order = FACES). ### `halveRGBA` ```ts function halveRGBA(px: Uint8Array, w: number, h: number): { px: Uint8Array; w: number; h: number } ``` Box-filter downsample one RGBA layer by 2× (for mip generation). Pure. ### `meshChunk` ```ts function meshChunk(get: (x: number, y: number, z: number) => number, x0: number, y0: number, z0: number, ch: number): Float32Array ``` Mesh one chunk into an interleaved Float32Array (VOX_FLOATS per vertex). Only faces exposed to air / a non-opaque different block are emitted. `get` is the WORLD accessor (crosses chunk borders for correct culling+AO). ### `raycastVoxel` ```ts function raycastVoxel( get: (x: number, y: number, z: number) => number, ox: number, oy: number, oz: number, dx: number, dy: number, dz: number, maxDist = 64, ): VoxelHit | null ``` March a ray through the grid; return the first SOLID block hit (or null). `place` = hit cell + face normal is the empty cell to build into. ### `tileMipChain` ```ts function tileMipChain(baked: { data: Uint8Array; layers: number; res: number }, mipmaps = true): TileLevel[] ``` The baked pack's whole mip chain, level 0 first: each level box-filters every layer of the one above with `halveRGBA`, down to 1×1 (`floor(log2(res)) + 1` levels). One level when `mipmaps` is false. Both renderers upload exactly this, so WebGL2 and WebGPU sample the same texels at every distance. Pure. ### `vertexAO` ```ts function vertexAO(side1: boolean, side2: boolean, corner: boolean): number ``` Standard 3-sample corner AO: 0 (both sides closed) … 3 (all open). ### `voxelTerrain` ```ts function voxelTerrain(world: VoxelWorld, opts: VoxelTerrainOptions = {}): void ``` Fill a VoxelWorld with a landscape. Pure + deterministic by seed — the same (type, seed) is the same world on every machine. Every type is SOLID from the surface down to bedrock (dig-through), coloured grass/sand/snow by height, with an ore-flecked stone core. Reseed by calling `clear()` then this again. ## Classes ### `VoxelAgent` ```ts class VoxelAgent ``` A mob: a VoxelBody plus a tiny brain. `wander` roams and randomly re-heads; `seek`/`flee` chase or avoid a target; all of them AUTO-JUMP when a wall blocks them (so they climb terraces like a Minecraft mob). Drive it with `update(dt, target?)`. - `readonly body: VoxelBody` — The physics body that the brain drives. Read its position for rendering. - `mode: VoxelAgentMode` — The active steering mode. Change it at any time. - `speed: number` — The move speed, in blocks each second. Default 3. - `heading: number` — Current heading in radians (wander) — also where a mesh should face. - `constructor(world: VoxelWorld, spawn: { x: number; y: number; z: number }, opts: VoxelAgentOptions = {})` - `update(dt: number, target?: { x: number; z: number }): void` — One AI tick. `target` is required for seek/flee (a point to chase/avoid). ### `VoxelBody` ```ts class VoxelBody ``` An axis-aligned body that walks the voxel world: gravity, jumping, per-axis swept collision resolve against solid blocks, and auto step-up over 1-block ledges. Feed it a wished horizontal velocity + a jump flag each `step`; it resolves the move and reports `onGround` / `blocked`. - `x: number` — The X centre of the footprint, in blocks. - `y: number` — The bottom of the body, in blocks (Y). - `z: number` — The Z centre of the footprint, in blocks. - `vy: number` — The vertical speed, in blocks each second. Negative is falling. - `onGround: boolean` — True when the body stands on a solid block after the last step. - `blocked: boolean` — True when a wall stopped horizontal motion last step (AI: turn/jump). - `readonly hw: number` — Half the footprint width, in blocks. The body spans x - hw .. x + hw. - `readonly height: number` — The body height, in blocks. Default 1.8. - `constructor(private world: VoxelWorld, spawn: { x: number; y: number; z: number }, opts: VoxelBodyOptions = {})` - `step(dt: number, wishX: number, wishZ: number, jump: boolean): void` — Advance one tick. `wishX`/`wishZ` are desired horizontal velocity (blocks/s); `jump` launches if standing. Substepped so fast motion can't tunnel through a 1-block wall. ### `VoxelWorld` ```ts class VoxelWorld ``` A bounded grid of block ids, split into fixed-size chunks. Pure/testable. - `readonly sx: number` — The world width, in blocks (X). - `readonly sy: number` — The world height, in blocks (Y). - `readonly sz: number` — The world depth, in blocks (Z). - `readonly ch: number` — The chunk edge length, in blocks. Default 16. - `readonly cx: number` — The number of chunks along X. - `readonly cy: number` — The number of chunks along Y. - `readonly cz: number` — The number of chunks along Z. - `readonly dirty: Set` — Chunk indices needing a remesh. - `constructor(opts: VoxelWorldOptions = {})` - `inBounds(x: number, y: number, z: number): boolean` — Returns true when the cell (x, y, z) lies inside the world bounds. - `get(x: number, y: number, z: number): number` — Block id at a cell, or 0 (air) outside the world. - `set(x: number, y: number, z: number, id: number): void` — Set a cell. Marks the owning chunk (and a bordering neighbour) dirty. - `columnTop(x: number, z: number): number` — Highest solid block at column (x, z), or -1 if the column is empty. - `markAllDirty(): void` — Mark every non-empty chunk dirty (after a bulk generate, or device loss). - `clear(): void` — Empty the world back to all-air. Marks every previously-filled chunk dirty so its geometry clears on the next remesh (used by reseed). - `chunkCoords(idx: number): [number, number, number]` — Chunk grid coords from a linear chunk index (for the mesher). - `get chunkCount(): number` — The total number of chunk slots in the world, filled or not. - `hasChunk(idx: number): boolean` — Returns true when the chunk at a linear index holds block data. ## Constants ### `AO_LEVELS` ```ts const AO_LEVELS: number[] ``` Ambient-occlusion brightness by occluder count (0 = darkest corner). Deliberately gentle — the block look wants a hint of crease, not deep shadow (Minecraft absorbs very little light per face). ### `FACES` ```ts const FACES: Face[] ``` The six cube faces in mesher order: +X, -X, +Y, -Y, +Z, -Z. Each holds its normal, axes and UVs. ### `isOpaque` ```ts const isOpaque = (id: number): boolean=> … ``` Does this block fully hide the faces behind it? Air, leaves, glass and water do not. ### `isSolid` ```ts const isSolid = (id: number): boolean=> … ``` Does this block stop movement and answer a raycast? Water does not. ### `TILES` ```ts const TILES: readonly ["grassTop", "grassSide", "dirt", "stone", "cobble", "sand", "logTop", "logSide", "planks", "leaves", "water", "snowTop", "snowSide", "glass", "brick", "coalOre", "goldOre", "gravel", "bedrock"] ``` The tile layer names, in upload order. The index of a name is its array-texture layer. ### `VOX_FLOATS` ```ts const VOX_FLOATS: 8 ``` The number of floats in one voxel vertex: pos(3) + uv(2) + layer(1) + face(1) + ao(1). ## Types ### `BlockDef` ```ts interface BlockDef ``` One face's tile picked by axis. - `name: string` — The block name, for reading and debugging (`BLOCK` maps these names to ids). - `top: number` — Tile layer index for the +Y face. - `bottom: number` — Tile layer index for the -Y face. - `side: number` — Tile layer index for the four side faces (±X, ±Z). - `opaque?: boolean` — Fully hides faces behind it (default true). Leaves/glass/water = false. - `solid?: boolean` — Blocks movement / is pickable by the raycast (default true). Water = false. - `cutout?: boolean` — Alpha-tested in the shader (leaves, glass) — kept in the opaque pass. ### `TileLevel` ```ts interface TileLevel ``` One level of the texture pack's mip chain: every layer at `w`×`h`, one after another, as an array texture's level is laid out. - `w: number` — Level width in texels. - `h: number` — Level height in texels. - `data: Uint8Array` — RGBA bytes, `w * h * 4` per layer, every layer in order. ### `VoxelAgentMode` ```ts type VoxelAgentMode = 'wander' | 'seek' | 'flee' | 'idle' ``` The steering mode of a VoxelAgent: roam, chase a target, avoid a target, or stand still. ### `VoxelAgentOptions` ```ts interface VoxelAgentOptions extends VoxelBodyOptions ``` Options for a VoxelAgent: the body options plus mode, speed and wander seed. - `mode?: VoxelAgentMode` — The steering mode to start in. Default 'wander'. - `speed?: number` — Move speed, blocks/s (default 3). - `seed?: number` — Seed for wander randomness (default derived from spawn). ### `VoxelBodyOptions` ```ts interface VoxelBodyOptions ``` Options for a VoxelBody: its size in blocks and its gravity, jump and fall tuning. - `width?: number` — Footprint width in blocks (default 0.6). - `height?: number` — Height in blocks (default 1.8). - `stepHeight?: number` — Auto-climb ledges up to this tall without jumping (default 1.05 — walks single-block terraces smoothly; set ~0.6 for jump-required full blocks). - `gravity?: number` — Downward acceleration, blocks/s² (default 28). - `jumpSpeed?: number` — Jump launch speed, blocks/s (default 8.4 ≈ clears ~1.25 blocks). - `maxFall?: number` — Terminal fall speed, blocks/s (default 40). ### `VoxelHit` ```ts interface VoxelHit ``` The result of a voxel raycast: the block hit, the entry face normal, and the ray distance. - `x: number` — The X cell of the solid block hit. - `y: number` — The Y cell of the solid block hit. - `z: number` — The Z cell of the solid block hit. - `nx: number` — The X part of the entry face normal (points back toward the ray origin). - `ny: number` — The Y part of the entry face normal. - `nz: number` — The Z part of the entry face normal. - `dist: number` — Ray distance to the hit. ### `Voxels3dApi` ```ts interface Voxels3dApi ``` `game.voxels`. - `readonly world: VoxelWorld` — The CPU grid — the contract everything else reads. - `get(x: number, y: number, z: number): number` — Block id at a cell, 0 outside. - `set(x: number, y: number, z: number, id: number): void` — Set a cell, marking its chunk and any bordering neighbour for a remesh. - `columnTop(x: number, z: number): number` — Highest non-air block in a column, or −1. - `raycast(ox: number, oy: number, oz: number, dx: number, dy: number, dz: number, maxDist?: number): VoxelHit | null` — March a ray and return the first SOLID block, or null. The hit's face normal added to its cell IS the empty cell to build into. - `landscape(opts?: VoxelTerrainOptions): void` — Fill the volume with a generated landscape. - `clear(): void` — Empty it back to air. - `body(spawn: { x: number; y: number; z: number }, opts?: VoxelBodyOptions): VoxelBody` — A body that walks the blocks — the player, or a mob. - `agent(spawn: { x: number; y: number; z: number }, opts?: VoxelAgentOptions): VoxelAgent` — A body with steering on top of it. - `readonly blockSize: number` — World units per block. - `readonly chunksDrawn: number` — Chunks drawn last frame. - `readonly verticesDrawn: number` — Vertices submitted in visible chunks last frame. - `readonly remeshed: number` — Chunks re-meshed last frame. - `enabled: boolean` — Whether it draws. ### `Voxels3dOptions` ```ts interface Voxels3dOptions extends VoxelWorldOptions ``` Manifest options: the volume, the texture pack and how it draws. - `tileRes?: number` — Block-texture resolution in texels. Default 16 — the classic. - `seed?: number` — Texture-pack seed. Default 1. - `blockSize?: number` — World units per block. Default 1. - `mipmaps?: boolean` — Build mipmaps, which is what kills the shimmer on distant blocks. Default true. - `cullDist?: number` — Chunks further than this from the camera are skipped. Default 512. ### `VoxelTerrainOptions` ```ts interface VoxelTerrainOptions ``` Options for `voxelTerrain` and `landscape`: the landform, its seed, sea level and trees. - `type?: VoxelTerrainType` — Landform (default 'island'). All types fill SOLID down to bedrock, so you can dig right through them. 'island' + 'plains' add a sea; the rest are dry. - `seed?: number` — The random seed. The same (type, seed) makes the same world. Default 1. - `seaLevel?: number` — Water fill height. Defaults per type ('island'/'plains' have one; -1 = dry). - `trees?: boolean` — Scatter trees on grass (default true). - `treeDensity?: number` — Tree density multiplier (default 1). ### `VoxelTerrainType` ```ts type VoxelTerrainType = 'island' | 'flat' | 'plains' | 'hills' | 'mountains' ``` The landform that `voxelTerrain` builds: an island with a sea, or a dry or wet plain, or hills. ### `VoxelWorldOptions` ```ts interface VoxelWorldOptions ``` Options for a VoxelWorld: the world size in blocks and the chunk edge length. - `sizeX?: number` — The world width, in blocks (X). Default 128. - `sizeY?: number` — The world height, in blocks (Y). Default 48. - `sizeZ?: number` — The world depth, in blocks (Z). Default 128. - `chunk?: number` — Chunk edge in blocks (default 16). Bigger = fewer draws, costlier edits. --- ## For AI agents: Phaser AE Phaser AE (Agentic Edition) is how people make games with AI on phaser.io. 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