# Creator Data Structure

This document describes the internal data structures used by the XRWise Creator editor.

---

## `SceneItem`

A single object in the scene. Stored in the Zustand store as `Record<number, SceneItem>`.

```ts
type SceneItem = {
  // --- always present ---
  type:       ItemType                    // e.g. "Cube", "Camera", "Directional Light"
  category:   string                      // e.g. "Basic", "Light", "Streaming"
  position:   [number, number, number]    // world-space XYZ

  // --- transform ---
  rotation?:  number[]                    // Euler degrees [x, y, z]
  dimensions?: number[]                   // XYZ scale / size in metres

  // --- appearance ---
  color?:     string                      // hex color e.g. "#ffffff"
  opacity?:   number                      // 0–1

  // --- lights ---
  intensity?: number | string             // light intensity
  target?:    number[]                    // look-at point [x, y, z]

  // --- media / streaming ---
  file?:              string              // asset path or storage key
  LiveKitRoomID?:     string
  shader?:            string              // "unlit" | "lit" | "greenscreen"
  GreenScreenColor?:  string              // hex color
  GreenScreenBorderSettings?: string      // numeric string
  GreenScreenColorNear?:      string      // numeric string (0–1)
  widthcrop?:         number
  heightcrop?:        number
  videoJobId?:        string              // in-progress conversion job ID

  // --- text ---
  text?:       string
  fontWeight?: "light" | "regular" | "bold"
  fontSize?:   number

  // --- camera ---
  zoom?:       number                     // 1–10; maps to FOV = 50 / zoom

  // --- interactions ---
  grabable?:   boolean
  locked?:     boolean                    // blocks move gizmo + deletion in the editor
}
```

### Fields by item type

| Type | Required fields | Optional fields |
|---|---|---|
| `Cube` / `Sphere` / `Cylinder` / `Cone` | `position` | `color`, `opacity`, `dimensions`, `rotation` |
| `Floor` | `position` | `color`, `opacity`, `dimensions`, `rotation` |
| `Wall` | `position` | `color`, `opacity`, `dimensions`, `rotation` |
| `Directional Light` | `position`, `target` | `color`, `intensity` |
| `Point Light` | `position` | `color`, `intensity` |
| `Entrance` / `Exit` | `position` | — |
| `Billboard` | `position`, `file` | `dimensions`, `rotation` |
| `LiveKitStream` | `position`, `LiveKitRoomID` | `shader`, `GreenScreenColor`, `GreenScreenBorderSettings`, `GreenScreenColorNear`, `widthcrop`, `heightcrop`, `dimensions`, `rotation` |
| `VideoWall` | `position` | `file`, `videoJobId`, `widthcrop`, `heightcrop`, `dimensions`, `rotation` |
| `Presentation` | `position` | `file`, `dimensions`, `rotation` |
| `Camera` | `position`, `target` | `zoom`, `rotation` |
| `Text` | `position`, `text` | `color`, `fontSize`, `fontWeight`, `dimensions`, `rotation` |
| `Custom` | `position`, `file` | `dimensions`, `rotation` |
| `Area` | `position` | `dimensions` (X/Z footprint only — Y is fixed), `rotation` |

### Common optional field (all types)

| Field | Type | Description |
|---|---|---|
| `grabable` | `boolean` | Whether the item is interactable in-experience |
| `locked` | `boolean` | When `true`, hides the move gizmo for the item and blocks deletion until unlocked from the menubar |

---

## `SceneItems`

The full scene is stored as a flat map keyed by numeric ID:

```ts
type SceneItems = Record<number, SceneItem>
```

IDs are assigned sequentially when items are spawned and do not change.

---

## `SceneGroups`

Used by the Grouping feature to let several items (or nested groups) be selected, moved, and managed as one.

```ts
type GroupChild =
  | { kind: "item"; id: number }
  | { kind: "group"; id: number }

type SceneGroup = {
  name: string
  children: GroupChild[]
}

type SceneGroups = Record<number, SceneGroup>
```

Group IDs are assigned sequentially from the store's `nextGroupId` counter, independent of item IDs. A group's `children` reference item/group IDs directly — there is no `groupId` field on `SceneItem` itself.

---

## `SceneStore` (Zustand)

The complete editor state. Fields marked 💾 are persisted to `localStorage` under the key `scene-storage`.

| Field | Type | Default | 💾 | Description |
|---|---|---|---|---|
| `items` | `SceneItems` | `{}` | ✅ | All scene objects |
| `selected` | `number \| null` | `null` | ✅ | Currently selected item ID |
| `skyColor` | `string` | `"#ffffff"` | ✅ | Background color |
| `showGrid` | `boolean` | `true` | ✅ | Grid visibility |
| `customItems` | `CustomItem[]` | `[]` | ✅ | User-uploaded GLB assets |
| `showLights` | `boolean` | `true` | ✅ | Light helper visibility |
| `showWalls` | `boolean` | `true` | ✅ | Wall visibility |
| `showAreas` | `boolean` | `true` | ✅ | Area Collider visibility (Canvas Toggles) |
| `cameraTarget` | `number[]` | `[0,0,0]` | ✅ | OrbitControls look-at point |
| `cameraRotation` | `number[]` | `[0,0,0]` | ✅ | Editor camera rotation |
| `cameraQuaternion` | `[x,y,z,w]` | `[0,0,0,0]` | ✅ | Editor camera quaternion |
| `graphicalCoding` | `{ nodes, connections } \| null` | `null` | ✅ | Legacy node-graph coding state (superseded by `blockCoding`) |
| `blockCoding` | `{ scripts: unknown[] } \| null` | `null` | ✅ | Block Coding scripts — see [Block Coding data structure](./data-structure-block-coding.md) |
| `backgroundSound` | `string \| null` | `null` | ✅ | Uploaded ambient sound storage path (World Settings → Sound) |
| `groups` | `SceneGroups` | `{}` | ✅ | All item/group hierarchies |
| `nextGroupId` | `number` | `1` | ✅ | Next group ID to assign |
| `selectedGroup` | `number \| null` | `null` | — | Currently selected group ID |
| `multiSelectedItems` | `number[]` | `[]` | — | Item IDs in a multi-select (shift-click) |
| `multiSelectedGroups` | `number[]` | `[]` | — | Group IDs in a multi-select |
| `past` / `future` | `HistorySnapshot[]` | `[]` | — | Undo/redo stacks — see [Undo/Redo](#undoredo) below |
| `message` | `string \| null` | `null` | — | Transient toast message |
| `hovered` | `number \| null` | `null` | — | Item ID currently hovered in canvas or panel |
| `focusItem` | `number \| null` | `null` | — | Item ID the camera should focus on |
| `isDragging` | `boolean` | `false` | — | Pointer drag state |
| `isTyping` | `boolean` | `false` | — | Text input focus state |
| `orbitControls` | `OrbitControlsImpl \| null` | `null` | — | Live OrbitControls ref |
| `api` | `ScreenshotAPI \| null` | `null` | — | Screenshot renderer ref |

💾 reflects the `partialize` allowlist in `lib/SceneStore.ts` — `selectedGroup`, `multiSelectedItems`, `multiSelectedGroups`, `past`, `future`, and the transient/ref fields below them are intentionally excluded, so undo history and multi-selection do not survive a page refresh.

---

## Undo/Redo

`past`/`future` hold up to `MAX_HISTORY` (50) `HistorySnapshot`s:

```ts
type HistorySnapshot = {
  items: SceneItems
  groups: SceneGroups
  nextGroupId: number
}
```

- Mutations that go through `setItems`, `updateItem`, `batchUpdateItems`, or any group action (`createGroup`, `createGroupFromSelection`, `disbandGroup`, `renameGroup`) push the *pre-change* state onto `past` and clear `future`.
- Pushes are coalesced: rapid successive edits (e.g. dragging a gizmo) within 400ms of the last push are merged into one history entry, so undo steps back per gesture rather than per frame.
- `undo()`/`redo()` swap `items`/`groups`/`nextGroupId` between `past`/`future` and clear the current selection state (`selectedGroup`, `multiSelectedItems`, `multiSelectedGroups`).
- History is in-memory only — it is not part of `partialize` and does not round-trip through save/load or the database JSON.

---

## `ITEMS_CONFIG` spawn defaults

When an item is added to the scene, it is initialized with these values from `items-config.tsx`:

| Type | `dimensions` | `color` | `rotation` | `spawnY` | `customAttributes` |
|---|---|---|---|---|---|
| `Cube` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `0.5` | — |
| `Sphere` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `0.5` | — |
| `Cylinder` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `0.5` | — |
| `Cone` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `0.5` | — |
| `Floor` | `[10,0.1,10]` | `#ffffff` | `[0,0,0]` | `0` | — |
| `Wall` | `[20,5,0.1]` | `#ffffff` | `[0,90,0]` | `2.5` | — |
| `Point Light` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `5` | `intensity: 50, target: [0,0,0]` |
| `Directional Light` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `5` | `intensity: 20, target: [0,0,0]` |
| `Entrance` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `0.1` | — |
| `Exit` | `[1,1,1]` | `#962929` | `[0,0,0]` | `0.1` | — |
| `Billboard` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `4` | `file: "/img/default-img.png"` |
| `LiveKitStream` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `4` | `LiveKitRoomID: "Gas Station"` |
| `VideoWall` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `4` | — |
| `Presentation` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `4` | — |
| `Camera` | `[1,1,1]` | `#444444` | `[0,0,0]` | `4` | `zoom: 1, target: [0,0,0]` |
| `Text` | `[0.5,0.5,0.5]` | `black` | `[0,0,0]` | `2` | `text: "Text", fontWeight: "regular", fontSize: 5` |
| `Custom` | `[1,1,1]` | `#ffffff` | `[0,0,0]` | `1` | — |
| `Area` | `[10,0.1,10]` | `#ffffff` | `[0,0,0]` | `0` | — |