# sm.quat.rotX90

Returns the rotation constant for rotating 90 degrees around the X-axis.

**Kind:** Function

**Environments:** Game, Terrain

## Game

``` { .lua .api-signature }
sm.quat.rotX90(  )
```

[Open the full Game reference](../Game-Script-Environment/Static-Functions/sm.quat.md#rotx90)

**Returns:**

| Type | Description |
| --- | --- |
| [Quat](../Game-Script-Environment/Userdata/Quat.md) | The rotation quaternion. |

## Terrain

``` { .lua .api-signature }
sm.quat.rotX90(  )
```

[Open the full Terrain reference](../Terrain-Script-Environment/Static-Functions/sm.quat.md#rotx90)

**Returns:**

| Type | Description |
| --- | --- |
| [Quat](../Terrain-Script-Environment/Userdata/Quat.md) | The rotation quaternion. |