---
title: rotationStiffness
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/ikrig/joint/rotationstiffness
---

# rotationStiffness

The per-axis rotational stiffness of the joint.

## Declaration

```swift
var rotationStiffness: SIMD3<Float>
```

## Discussion

Discussion A joint with higher stiffness rotates less to reach demands. Values are in the closed range [0, 1], where 0 means free to rotate, and 1 is no movement.