How to Spawn Only One Object in Unity AR Foundation

Learn how to prevent multiple object spawns in Unity AR by implementing a simple boolean check. Perfect for beginners working on augmented reality projects!
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How to Spawn Only One Object in Unity AR Foundation

If you're diving into the world of Unity and augmented reality (AR), you may encounter a frustrating issue: your objects keep spawning every time the screen is tapped. This can be particularly challenging for projects aimed at young audiences, where accidental taps are common.

In this guide, we will explore an effective solution to ensure that only one object spawns when the screen is touched, preventing overlap of objects and enhancing the gaming experience for kids.

Understanding the Problem

In Unity, particularly when utilizing AR Foundation, tapping the screen may result in multiple objects being spawned if the logic isn't managed properly. For example, if a child touches the screen multiple times while looking around, new objects can appear over existing ones, causing chaos in the game environment.

The goal is to ensure that when a player taps the screen, an object is instantiated only once.

The Solution

Step 1: Add a Boolean Check

To achieve the desired functionality, we will introduce a simple boolean variable in your script that will track whether the object has already been spawned. Here's how you can set this up:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Modify Object Spawning Logic

Next, you'll need to integrate this boolean into your existing touch detection logic. This ensures that once the object is spawned, subsequent taps won't trigger additional spawns. Update your touch input code as follows:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Modify the Update Function

Finally, incorporate your check into the Update() method. This adjustment allows the program to only show the marker (the visual representation of where the object will be placed) when the object hasn’t been spawned yet:

[[See Video to Reveal this Text or Code Snippet]]

Full Code Example

Here’s how your complete script will look with these modifications:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

This simple check using the boolean variable effectively limits the spawning of your AR object to just once. By following these steps, you can improve the user experience for your target audience and eliminate the clutter caused by multiple object spawns.

If you're new to Unity or C# and are working on your first AR project, remember that small changes make a big difference. Keep experimenting, and you'll become more adept in no time!

Feel free to reach out if you have any additional questions or need further assistance with Unity development!

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