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# isActive

A Boolean that indicates whether the joint is active.

```
var isActive: Bool { get }
```

## Discussion

Inactive joints do not participate in the physics simulation.

One example is a joint that does not reference any [`Entity`](/documentation/RealityKit/Entity) with [`PhysicsBodyMode.dynamic`](/documentation/RealityKit/PhysicsBodyMode/dynamic),
or when one or both the referenced entities are not active.

---

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