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# sources

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

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

## 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`](/documentation/RealityKit/BlendTreeSourceNode), this structure blends its animation into
the output. If a source is a [`BlendTreeBlendNode`](/documentation/RealityKit/BlendTreeBlendNode), this structure
blends the output of its sources into this structure’s output.

---

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