# Vector3.SubtractDirection

```csharp
Vector3 SubtractDirection(in Vector3 direction, float strength = 1)
```

Given a vector like 1,1,1 and direction 1,0,0, will return 0,1,1.
This is useful for velocity collision type events, where you want to
cancel out velocity based on a normal.
For this to work properly, direction should be a normal, but you can scale
how much you want to subtract by scaling the direction. Ie, passing in a direction
with a length of 0.5 will remove half the direction.

### Parameters

- `in direction` (`Vector3`)
- `strength` (`float`), default `1`

### Returns

`Vector3`

Declared in [Vector3](/api/Vector3).
Assembly: `Sandbox.System`.