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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 (65)

  1. 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

  2. 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.

  3. Maverick

    Aug 31, 2016 16:11

    Still present in 5.4.0.p4

  4. Ryan-Gatts

    Aug 23, 2016 01:27

    Still occurs in 5.4.0f3

  5. 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.

  6. isbeorn

    Aug 19, 2016 06:28

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

  7. Dimetrock

    Aug 18, 2016 07:38

    - bug is present in 5.4.0f3

  8. Laious

    Aug 15, 2016 16:49

    Same for me... It was working fine on 5.3

  9. Louis-N-D

    Aug 05, 2016 21:38

    Filed a bug for this in the final 5.4 release and it got flagged as a duplicate of this bug. Just wanted to confirm here that the release version of 5.4 definitely still exhibits this bug.

  10. Louis-N-D

    Jul 29, 2016 19:03

    Yep. Upgraded to the 5.4 release last night and this suddenly reared its ugly (and very repetitive) head.

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