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Fixed in 5.4.1



Found in


Issue ID




Two independent Particle systems appear to be using the exact same seed for randomisation



How to reproduce:

1. Open attached project
2. Open scene particles.unity
3. Play the scene
- Note how the coloured particles and the black particles appear to be moving in the exact same patterns
- This happens even if the particles aren't parented/childed to each other
- The particles in both separate systems should be moving in different ways

- Reproduced in Version 5.4.0b11 (323b0238353b), Version 5.4.0b6 (2c3d6b93e789)
- Not reproducible in Version 5.3.4p1 (e89f89413a91)

Comments (68)

  1. PieterAlbers

    Oct 25, 2016 10:29

    I still don't have randomized particles in 5.4.2

  2. chegarty3

    Oct 14, 2016 15:43

    Still seeing this issue in 5.4.1 even though it's claimed to be fixed. Different seeds produce the exact same pattern of particles. The workaround of manually randomizing the seed does nothing.

    ps.randomSeed = (uint)Random.Range(0, int.MaxValue);

  3. Soulice

    Oct 01, 2016 14:36

    Sorry, in 5.4.0f3

  4. Soulice

    Oct 01, 2016 14:35

    In 5.4.1 and still seeing this issue. Attached particle system to object and burst on collision, same pattern each burst

  5. env_warby

    Sep 06, 2016 22:46

    i just upgraded to the 5.4.0f3 release build and its definitely in there i saw it immediately / first thing i noticed that was different.

  6. Maverick

    Aug 31, 2016 16:11

    Still present in 5.4.0.p4

  7. Ryan-Gatts

    Aug 23, 2016 01:27

    Still occurs in 5.4.0f3

  8. isbeorn

    Aug 19, 2016 07:09

    Does 'Workaround is possible' mean that there is a workaround? What is it? Giving the particle systems new seeds doesn't seem to make any difference.

  9. isbeorn

    Aug 19, 2016 06:28

    I'm also suffering from this. In 5.4.0f3.

  10. Dimetrock

    Aug 18, 2016 07:38

    - bug is present in 5.4.0f3

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