---
title: inertia
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/physicsmassproperties/inertia
---

# inertia

The inertia in kilograms per square meter.

## Declaration

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

## Discussion

Discussion The vector contains the diagonal elements of the diagonalized inertia matrix.

## See Also

### Getting mass properties

- [mass](realitykit/physicsmassproperties/mass.md)
- [centerOfMass](realitykit/physicsmassproperties/centerofmass.md)