# PhysicsChainDefinition

> Create a default PhysicsChain definition.

## Definition

* **Type:** Constructor
* **Namespace:** [Unity.U2D.Physics](/engine/6000.6/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

## PhysicsChainDefinition()

Create a default [PhysicsChain](/engine/6000.6/script-reference/unity/u2d/physics/physicschain.md) definition.

```csharp
public PhysicsChainDefinition()
```

## PhysicsChainDefinition(bool)

Create a default [PhysicsChain](/engine/6000.6/script-reference/unity/u2d/physics/physicschain.md) definition.

```csharp
public PhysicsChainDefinition(bool useSettings)
```

### Parameters

**** (\[bool]\(https\://learn.microsoft.com/dotnet/api/system.boolean)): Controls whether the default come settings from the physics settings or not.