Kursach_StealthAction/.opencode/skills/terrain-create/SKILL.md

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---
name: terrain-create
description: Create a new GameObject with a `Terrain` + `TerrainCollider` backed by a freshly created `TerrainData` asset. Set heightmap resolution and the terrain world size (width/height/length). Returns the new GameObject reference and instanceId.
metadata:
generated-by: mcp-plugin-dotnet
---
# Terrain / Create Terrain
Create a new GameObject hosting a `Terrain` and a `TerrainCollider` in the active scene, backed by a new `TerrainData` asset saved to the project.
## Inputs
- `name` — optional GameObject name (default `Terrain`).
- `terrainDataAssetPath` — project path for the new `TerrainData` asset (default `Assets/TerrainData_<name>.asset`). Must start with `Assets/` and end with `.asset`.
- `heightmapResolution` — heightmap resolution; rounded to a valid `2^n + 1` value (default 513).
- `width` / `length` — horizontal terrain size in world units (X / Z, default 1000 each).
- `height` — vertical terrain size in world units (Y, default 600).
- `position` — optional world position of the terrain GameObject (default zero).
## Behavior
Creates the `TerrainData`, sets its `heightmapResolution` and `size`, writes it as an asset, then creates the GameObject via `Terrain.CreateTerrainGameObject`, positions it, marks the scene dirty, repaints, and returns the new GameObject reference and instanceId. Runs on the Unity main thread.
## How to Call
```bash
unity-mcp-cli run-tool terrain-create --input '{
"name": "string_value",
"terrainDataAssetPath": "string_value",
"heightmapResolution": 0,
"width": 0,
"length": 0,
"height": 0,
"position": "string_value"
}'
```
> For complex input (multi-line strings, code), save the JSON to a file and use:
> ```bash
> unity-mcp-cli run-tool terrain-create --input-file args.json
> ```
>
> Or pipe via stdin (recommended):
> ```bash
> unity-mcp-cli run-tool terrain-create --input-file - <<'EOF'
> {"param": "value"}
> EOF
> ```
### Troubleshooting
If `unity-mcp-cli` is not found, either install it globally (`npm install -g unity-mcp-cli`) or use `npx unity-mcp-cli` instead.
Read the /unity-initial-setup skill for detailed installation instructions.
## Input
| Name | Type | Required | Description |
|------|------|----------|-------------|
| `name` | `string` | No | Name of the new Terrain GameObject. |
| `terrainDataAssetPath` | `string` | No | Project path for the new TerrainData asset (Assets/...asset). Defaults to Assets/TerrainData_<name>.asset. |
| `heightmapResolution` | `integer` | No | Heightmap resolution. Rounded up to a valid (2^n + 1) value. |
| `width` | `number` | No | Terrain width in world units (X axis). |
| `length` | `number` | No | Terrain length in world units (Z axis). |
| `height` | `number` | No | Terrain height in world units (Y axis). |
| `position` | `any` | No | World-space position of the terrain GameObject. |
### Input JSON Schema
```json
{
"type": "object",
"properties": {
"name": {
"type": "string"
},
"terrainDataAssetPath": {
"type": "string"
},
"heightmapResolution": {
"type": "integer"
},
"width": {
"type": "number"
},
"length": {
"type": "number"
},
"height": {
"type": "number"
},
"position": {
"$ref": "#/$defs/UnityEngine.Vector3"
}
},
"$defs": {
"UnityEngine.Vector3": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
},
"z": {
"type": "number"
}
},
"required": [
"x",
"y",
"z"
],
"additionalProperties": false
}
}
}
```
## Output
### Output JSON Schema
```json
{
"type": "object",
"properties": {
"result": {
"$ref": "#/$defs/com.IvanMurzak.Unity.MCP.Editor.API.Tool_Terrain-TerrainCreateResponse"
}
},
"$defs": {
"AIGD.GameObjectRef": {
"type": "object",
"properties": {
"instanceID": {
"$ref": "#/$defs/UnityEngine.EntityId",
"description": "instanceID of the UnityEngine.Object. If it is '0' and 'path', 'name', 'assetPath' and 'assetGuid' is not provided, empty or null, then it will be used as 'null'. Priority: 1 (Recommended)"
},
"path": {
"type": "string",
"description": "Path of a GameObject in the hierarchy Sample 'character/hand/finger/particle'. Priority: 2."
},
"name": {
"type": "string",
"description": "Name of a GameObject in hierarchy. Priority: 3."
},
"assetType": {
"$ref": "#/$defs/System.Type",
"description": "Type of the asset."
},
"assetPath": {
"type": "string",
"description": "Path to the asset within the project. Starts with 'Assets/'"
},
"assetGuid": {
"type": "string",
"description": "Unique identifier for the asset."
}
},
"required": [
"instanceID"
],
"description": "Find GameObject in opened Prefab or in the active Scene."
},
"UnityEngine.EntityId": {
"type": "string",
"pattern": "^[0-9]+$"
},
"System.Type": {
"type": "string"
},
"AIGD.ComponentRef": {
"type": "object",
"properties": {
"index": {
"type": "integer",
"description": "Component 'index' attached to a gameObject. The first index is '0' and that is usually Transform or RectTransform. Priority: 2. Default value is -1."
},
"typeName": {
"type": "string",
"description": "Component type full name. Sample 'UnityEngine.Transform'. If the gameObject has two components of the same type, the output component is unpredictable. Priority: 3. Default value is null."
},
"instanceID": {
"$ref": "#/$defs/UnityEngine.EntityId",
"description": "instanceID of the UnityEngine.Object. If this is '0', then it will be used as 'null'."
}
},
"required": [
"index",
"instanceID"
],
"description": "Component reference. Used to find a Component at GameObject."
},
"UnityEngine.Vector3": {
"type": "object",
"properties": {
"x": {
"type": "number"
},
"y": {
"type": "number"
},
"z": {
"type": "number"
}
},
"required": [
"x",
"y",
"z"
],
"additionalProperties": false
},
"com.IvanMurzak.Unity.MCP.Editor.API.Tool_Terrain-TerrainCreateResponse": {
"type": "object",
"properties": {
"gameObjectRef": {
"$ref": "#/$defs/AIGD.GameObjectRef",
"description": "Reference to the created Terrain GameObject."
},
"terrainRef": {
"$ref": "#/$defs/AIGD.ComponentRef",
"description": "Reference to the created Terrain component."
},
"instanceId": {
"$ref": "#/$defs/UnityEngine.EntityId",
"description": "Instance id of the created GameObject."
},
"gameObjectName": {
"type": "string",
"description": "Name of the created GameObject."
},
"terrainDataAssetPath": {
"type": "string",
"description": "Project path of the created TerrainData asset."
},
"heightmapResolution": {
"type": "integer",
"description": "Resolved heightmap resolution."
},
"size": {
"$ref": "#/$defs/UnityEngine.Vector3",
"description": "Resolved terrain size (X=width, Y=height, Z=length)."
}
},
"required": [
"instanceId",
"heightmapResolution",
"size"
]
}
},
"required": [
"result"
]
}
```