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Can a particle system be previewed on an activation track?

Discussion in 'Timeline' started by fastgamedev, Aug 28, 2017.

  1. fastgamedev

    fastgamedev

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    I have a particle system on an Activation Track. It works fine in play mode, but doesn't emit in Timeline preview mode. Wasn't this a feature of Timelines, previewing of particle systems?
     
  2. thierry_unity

    thierry_unity

    Unity Technologies

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    Hi @fastgamedev ,
    Yes previewing particles is part of timeline, just not from the activation track.
    You will need to use the controls track to be able to preview particles outside of playmode.
     
  3. fastgamedev

    fastgamedev

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    @thierry_unity ,
    Thank you, using the controls track worked, I can preview the main particle system. But now the sub-emitter particle system (set to emit at birth on the main one) is not emitting particles either in preview or in play mode. ("Control children" is checked on the control playable asset). How do I fix the sub-emitter?
     
  4. thierry_unity

    thierry_unity

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    Hi,
    We have an opened bug already about flickering sub-particles (Bug ID #888010 for references), I suppose you are hitting the same or similar issue.
    I'm not super familiar with sub-particles, maybe an example of your particles system could help me figure it out.
     
  5. fastgamedev

    fastgamedev

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    @thierry_unity ,
    I don't think this is the same bug, there is no flickering, it just doesn't work in preview and in play modes. I created a sample scene for you, attached.

    1. Play the timeline in preview mode. You will see that only the main particle system is activated.
    2. Play the scene and watch the timeline in play mode. You will see that the subemitter is activating, but its particles don't move.
    3. Disable the timeline and enable the particle system. You will see that the subemitter is activating and its particles move as in an explosion.

    #1 and #2 should look like #3.
     

    Attached Files:

  6. thierry_unity

    thierry_unity

    Unity Technologies

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    Great!
    We have to talk with the particles team but it's indeed a problem, it looks similar to the bug that was already sent to us.
    But there are some minor differences so I opened a new one #947038

    sorry about that, we will try to find a solution as soon as possible.
     
  7. fastgamedev

    fastgamedev

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  8. pixelsteam

    pixelsteam

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    Does anyone know if this issue has been solved...I seem to have the same challenge
     
  9. mikew_unity

    mikew_unity

    Unity Technologies

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    strange, we used control tracks with sub-emitters on the Baymax Dream project in quite a few places without issues. Wonder what might be different with what we did...
     
  10. seant_unity

    seant_unity

    Unity Technologies

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    We have put many fixes for particles systems since that post, but the specific issue with the posted particle system hasn't been resolved. That case has somehow slipped through the cracks.

    @pixelsteam If you have a specific particle system that isn't working, please file a bug with the particle system attached.
     
  11. unity_cdk3rzBCOnz3ow

    unity_cdk3rzBCOnz3ow

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    Still seeing this issue in 2018.4.2 --- sub emitters not triggering on control track.