[two.png](https://github.com/Unity-Technologies/arfoundation-demos/blob/master/Assets/ImageTracking/TrackedImages/two.png) which can be printed out or displayed on digital devices. The images are 2048x2048 pixels with a real world size of 0.2159 x 0.2159 meters.
The Prefabs for each number are prefab variants derived from [`OnePrefab.prefab`](https://github.com/Unity-Technologies/arfoundation-demos/blob/master/Assets/ImageTracking/Art/One/OnePrefab.prefab). They use a small quad that uses the [`MobileARShadow.shader`](https://github.com/Unity-Technologies/arfoundation-demos/blob/master/Assets/Common/Shaders/MobileARShadow.shader) in order to accurately show a shadow of the 3D number.
the script [`NumberManager.cs`](https://github.com/Unity-Technologies/arfoundation-demos/blob/master/Assets/ImageTracking/Scripts/NumberManager.cs) handles setting up a contraint (in this case used to billboard the model) on the 3D number objects and provides a function to enable and disabling the rendering of the 3D model.
the script [`NumberManager.cs`](https://github.com/Unity-Technologies/arfoundation-demos/blob/master/Assets/ImageTracking/Scripts/NumberManager.cs) handles setting up a [`contraint`](https://docs.unity3d.com/Manual/Constraints.html) (in this case used to billboard the model) on the 3D number objects and provides a function to enable and disabling the rendering of the 3D model.
GitHub