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Some particles jitter when emitted, others do not

Discussion in 'General Graphics' started by brainwipe, Jul 28, 2018.

  1. brainwipe

    brainwipe

    Joined:
    Aug 21, 2017
    Posts:
    37
    I have a physics object that has two kinds of particle emitter on them for spewing out smoke. Each emitter is
    set up the same (except for some cosmetic differences). However, the particles from the smoke stacks seen below jitter, whereas the particles coming from the vents at the back are smooth. Why would the smoke stacks jitter?

    This only happens when moving at speed.



    One difference between these two objects is where they sit in the hierarchy. The object hierarchy is:
    • Cloudship [Rigidbody with forces acting on it]
      • Vents Empty Game Object
        • Left Vent Empty Game Object
          • Vent Particles [Particle Emitter]
        • (Same for right hand side)
      • Buildings Game Object
        • Smoke stack [Kinematic Rigidbody]
          • Particle Emitter
    Version: 2018.2.1
    Lightweight Render pipeline: 1.1.11

    Is there any more information you require?

    Thanks in advance.
     
  2. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    1,741
    Hey, it's hard to say, without knowing anything about the setup of your Particle System.

    Probably the best way to get help in this instance is to submit a minimal repro as a bug report, so we have all the necessary information. You may reply here with the case number once you have it, to speed things up.
     
    karl_jones and brainwipe like this.
  3. brainwipe

    brainwipe

    Joined:
    Aug 21, 2017
    Posts:
    37
    It took a few days to repro but I have done it! Bug report submitted.
     
  4. brainwipe

    brainwipe

    Joined:
    Aug 21, 2017
    Posts:
    37
    (It this moment in time, I think it's me doing something wrong rather than a bug with the editor or player)
     
  5. glenneroo

    glenneroo

    Joined:
    Oct 27, 2016
    Posts:
    63
    Did you ever figure this out? I am also having jittering issues with some of my particles.
     
  6. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    1,741
  7. karl_jones

    karl_jones

    Unity Technologies

    Joined:
    May 5, 2015
    Posts:
    4,918
    Yes I replied to the bug report.

    This is my reply

    TLDR
    Dont attach your camera to a moving object especially if it's using a rigid body. Instead, use a script(or cinemachine etc) to smoothly follow the object(lerp etc).
     
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