# BuildTimeOnly

> Updates the sprite atlas cache when the Player or bundles builds containing Sprite with the legacy packing tag.

## Definition

* **Type:** Field
* **Namespace:** [UnityEditor](/engine/6000.6/script-reference/unityeditor.md)
* **Assembly:** UnityEditor.CoreModule

> **Warning:**
>
> **Deprecated.** Sprite Packing Tags are deprecated. Please use Sprite Atlas asset.

```csharp
BuildTimeOnly = 1
```

### Remarks

Note that the [SpriteAtlas](/engine/6000.6/script-reference/unityengine/u2d/spriteatlas.md) is not packed.