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Скачать или смотреть How to Properly Control Trail Emission in Unity Using TrailRenderer

  • vlogize
  • 2025-08-11
  • 0
How to Properly Control Trail Emission in Unity Using TrailRenderer
turn trailrenderer emitting offc#unity game engine
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Описание к видео How to Properly Control Trail Emission in Unity Using TrailRenderer

Learn how to manage trail emission times effectively in Unity's `TrailRenderer` to solve common issues related to improper emission stoppage.
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This video is based on the question https://stackoverflow.com/q/65124636/ asked by the user 'Angga Dwi Krishnajaya' ( https://stackoverflow.com/u/13126758/ ) and on the answer https://stackoverflow.com/a/65131405/ provided by the user 'Renge' ( https://stackoverflow.com/u/3987342/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: turn trailrenderer emitting off

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Managing Trail Emission in Unity with TrailRenderer

As a game developer, you may encounter challenges when working with Unity’s TrailRenderer component. One common problem is controlling the emission of trails, particularly when you want to stop emitting them after a set duration. In this post, we'll explore a specific issue with trail emission timing and provide a clear solution to help you effectively manage your trail renderer's behavior.

The Problem: Trail Emission Doesn't Stop

In our case, the objective is to create a timer for the trail emission that automatically stops emitting after a specified period. However, the original code provided leads to the trail continuously emitting without stopping even after the timer has run out. Here’s the core part of the code in question:

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

The developer found that the TrailRenderer wouldn't cease emitting trails even after completing the set 2-second timer. The root of this issue lies in the constant resetting of the emitTimer variable every frame, which keeps it perpetually at 2 seconds. Let's take a closer look at how we can fix this.

Solution: Fixing the Timer Logic

To effectively manage the emission time, we need to ensure that our emitTimer is set only once when the trail starts emitting, rather than being reset every frame. Below are the steps to correct the logic in your Update() method.

Step 1: Modify the Start Method

We will ensure that we only set the emitTimer once at the start of the emission, rather than in the Update() loop. Here’s how to adjust the logic:

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

Step 2: Update the Update Method

Now, let's modify the Update() method to prevent the timer from resetting on every frame. Instead, it should only check if the trail is emitting and then count down the timer accordingly:

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

Conclusion

By following the steps above, you'll be able to manage the emission of trails effectively in Unity using TrailRenderer. Making sure the emitTimer is only set once during the start of an emission prevents it from resetting each frame, allowing for a smoother and more predictable behavior.

Feel free to implement this logic in your own projects to enhance your game's trail rendering capabilities!



With a clear understanding of how to manage trail emission, you'll find it easier to create engaging visuals while maintaining control over your game elements. Happy coding!

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