# Sandbox.ModelBuilder.AddFixedJoint

```csharp
FixedJointBuilder AddFixedJoint(int body1, int body2, System.Nullable<Transform> frame1 = null, System.Nullable<Transform> frame2 = null, bool collision = False)
```

### Parameters

- `body1` (`int`)
- `body2` (`int`)
- `frame1` (`System.Nullable<Transform>`), default `null`
- `frame2` (`System.Nullable<Transform>`), default `null`
- `collision` (`bool`), default `False`

### Returns

`FixedJointBuilder`

Declared in [Sandbox.ModelBuilder](/api/Sandbox.ModelBuilder).
Assembly: `Sandbox.Engine`.