---
title: sources
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/blendtreeblendnode/sources
---

# sources

The nodes that branch from a node to form part of a blend tree.

## Declaration

```swift
var sources: [any BlendTreeNode]
```

## Discussion

Discussion This node combines the animations of each member of this array to a single animation that represents a blend of the sources. If a source is a BlendTreeSourceNode, this structure blends its animation into the output. If a source is a BlendTreeBlendNode, this structure blends the output of its sources into this structure’s output.