---
title: isAdditive
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/entityaction/isadditive
---

# isAdditive

A Boolean value that determines whether this action additively blends with the prior stage.

## Declaration

```swift
var isAdditive: Bool { get }
```

## Discussion

Discussion When true, the action’s animation output is relative to an absolute base value, and the animation system blends the result additively with the prior blend stage. Apply actions additively by configuring them to produce animation offsets, such as delta values. The default value is false.