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# voxelBoundingBox(atIndex:)

Returns the extent of the specified voxel’s volume in the world coordinate space of the asset from which the voxel array was created.

```
func voxelBoundingBox(atIndex index: MDLVoxelIndex) -> MDLAxisAlignedBoundingBox
```

## Parameters

`index`

An index describing the location of a voxel within the three-dimensional grid of the voxel array. (The w component is ignored for this query.)

## Return Value

The bounding box for the single voxel at the specified index, in the world coordinate space of the asset from which the voxel array was created.

## Discussion

The coordinate space for spatial locations of voxels is the world space of the asset from which the voxel array was created, or for voxel arrays created with the [`init(data:boundingBox:voxelExtent:)`](/documentation/ModelIO/MDLVoxelArray/init(data:boundingBox:voxelExtent:)) initializer, the bounding box specified at initialization.

---

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