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# textureRegion

The region in the texture to update, in tiles.

```
var textureRegion: MTLRegion
```

## Discussion

When [`textureLevel`](/documentation/Metal/MTL4UpdateSparseTextureMappingOperation/textureLevel) is equal to the texture’s [`firstMipmapInTail`](/documentation/Metal/MTLTexture/firstMipmapInTail),
set `origin.y` to `0` and `size.height` to `1`.

---

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