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Fixed in 2017.2.0f3

Fixed in 2017.1, 2017.2



Found in


Issue ID




Particle System bursts twice when instantiated at a runtime



How to reproduce:
1. Open attached Unity project " (4.3 MB)" (attached to additional email)
2. Load "Bug" scene
3. Enter the Play mode
4. Press "Burst" button

Actual Result: ParticleSystem emits burst twice when added at a runtime.
Expected Result: ParticleSystem emits burst once.

Regression first introduced in: 2017.1.0a3
Reproducible with: 2017.3.0a1, 2017.2.0b4, 2017.1.0p2, 2017.1.0a3
Not reproducible with: 5.6.2p4, 2017.1.0a2

* If the same prefab is added to the scene in edit mode, it works correctly on play mode.
* In the 5.5 version either in edit and play modes multiple bursts occur.

Comments (4)

  1. 96d30cd5678df901432045d9681ae7fc?d=mm


    Feb 18, 2018 15:37

    Also getting this in 2017.2.0f3, as 1155032854 said.

  2. B4a2fae6cad9ea0eb67b42ff74d37d76?d=mm


    Nov 28, 2017 02:46

    I somehow solved the problem by using "Stop action" in particle system to disable particle instead of using my own script.

    Also, use sub-emitter to emit child particles, disable "emission" in particle system of any child object, this also solved the problem for me.

  3. B4a2fae6cad9ea0eb67b42ff74d37d76?d=mm


    Nov 28, 2017 02:17

    Still getting this in 2017.2.0f3

    When I play a particle system it always burst twice.

  4. 8eee75331ba9d2c426f3c4a9662136f7?d=mm


    Aug 28, 2017 13:10

    Getting this also in Unity 2017.1.0p1-p5

    It's really a gamebreaker if you depend on your ParticleSystems to spawn one mesh particle

    it happens for existing particle systems too, even when not instantiating them from code as well!

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