# Sandbox.PhysicsWorld.SetCollisionRules

```csharp
void SetCollisionRules(CollisionRules rules)
```

> **Obsolete.** Use CollisionRules Property

Used internally to set collision rules from gamemode's project settings.
You shouldn't need to call this yourself.

### Parameters

- `rules` (`CollisionRules`)

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