# terrainmod

> Talos 0.7 · Since 0.6

An op the entity contributes to a terrain, applied after the terrain file's own stack and moving with the entity (a pad flattened under a building).

Needs a `terrain` entity in the scene (`terrainmod-no-terrain`).

Use it in a scene entity's `components` list as `{ "type": "terrainmod", … }`. The contract writes the fields flat and refuses unknown keys.

## Fields

| Field | Type | Required | Default | Allowed values | Description |
|---|---|---|---|---|---|
| `terrain` | `string` | no |  |  | The terrain entity; the only one when absent. |
| `priority` | `integer` | no | `0` |  | Stack position among entity ops; after the file's stack. Default 0. |
| `op` | `TerrainOp` | yes |  |  | Positions in the op are in this entity's local frame. |

## Rules that can refuse it

- `terrainmod-no-terrain`