Augmented Reality for Developers

Handling empty scenes

If you delete all the pictures from the scene, we'll respawn a new one, so there's always at least one present. One way to detect the presence of pictures is to use tags. Let's add a Picture tag to our project and assign it to the DefaultPicture. Then we can see when all pictures are deleted, and we will know when to respawn one:

1. In Unity, with DefaultPicture selected, click the Tag list and choose Add Tag.
2. Press the + to add a new tag and name it Picture.

 

3. Now, back in the DefaultPicture's Inspector, use the Tag list again and select Picture,
4. Press Apply to save the prefab,

Now we can add the following code to GameController:

File: GameController.cs private int delay = 1; void Update() { if (delay == 0 && GameObject.FindGameObjectsWithTag("Picture").Length ...