# asset.ruler

> Talos next · Since next

Set an imported model's unit scale from two points on it (file space) and their real distance in metres, one undo step.

Clears targetSizeM.

| | |
|---|---|
| Title | Scale a scan by a ruler |
| Mode | `editor` |
| Token cost | about 145 tokens (listed only when its toolset is enabled) |
| Toolset | `assets` |

## Arguments

| Argument | Type | Required | Default | Allowed values | Description |
|---|---|---|---|---|---|
| `a` | `number[]` | yes |  |  | [x, y, z] in the file's space |
| `asset` | `string` | yes |  |  |  |
| `b` | `number[]` | yes |  |  |  |
| `metres` | `number` | yes |  |  | The real distance between a and b |

## Example

An MCP `tools/call` with the required arguments (placeholders in angle brackets).

```json
{
  "name": "asset.ruler",
  "arguments": {
    "a": [],
    "asset": "<asset>",
    "b": [],
    "metres": 0
  }
}
```