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# boundingBox

The bounding region of the scene to which light probes are being added.

```
var boundingBox: MDLAxisAlignedBoundingBox { get set }
```

## Discussion

When you call the [`MDLAsset`](/documentation/ModelIO/MDLAsset) [`placeLightProbes(withDensity:heuristic:using:)`](/documentation/ModelIO/MDLAsset/placeLightProbes(withDensity:heuristic:using:)) method to automatically distribute light probes in a scene, Model I/O reads this property to ask your code which regions should be evaluated for light probe placement.

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