Describes a VisualElement background.
| renderTexture | The RenderTexture to display as a background. |
| sprite | The sprite to display as a background. |
| texture | The texture to display as a background. |
| vectorImage | The VectorImage to display as a background. |
| GetSelectedImage | Retrieves the selected asset which can be of a type of Texture, Sprite, RenderTexture or VectorImage. |
| IsEmpty | Help verify whether an asset has been assigned or not. |
| FromRenderTexture | Creates a background from a RenderTexture. |
| FromSprite | Creates a background from a Sprite. |
| FromTexture2D | Creates a background from a Texture2D. |
| FromVectorImage | Creates a background from a VectorImage. |