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Question Particle System Broken in Certain Scenes

Discussion in 'General Graphics' started by DRRosen3, Oct 25, 2022.

  1. DRRosen3

    DRRosen3

    Joined:
    Jan 30, 2014
    Posts:
    683
    What might cause a Particle System to not render properly in certain scenes?

    This is what the effect looks like...


    This is what it looks like in a scene where it works...


    ...and this is what it looks like in another scene...
     
    DRRosen3, Oct 25, 2022
    #1

  2. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    2,240
    Is it using additive blend mode in any of its shaders? If so, that would cause it to only work against a dark background.
     
    richardkettlewell, Oct 26, 2022
    #2

  3. DRRosen3

    DRRosen3

    Joined:
    Jan 30, 2014
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    683
    I wasn't aware of that. Is this a URP "issue"? Is there a workaround/solution that would get it to work regardless of the background?
     
    DRRosen3, Oct 26, 2022
    #3

  4. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    2,240
    It's just how the maths for that blend mode works. Additive blending adds the 2 colors together (background + particles). so if the background is white, there isn't anywhere brighter to go from there, so the pixels stay white.

    The workaround is to use a different render mode, such as Fade. But it may require some modification of the art content too, to get the look you want.
     
    richardkettlewell, Oct 27, 2022
    #4
    BrandyStarbrite likes this.

  5. DRRosen3

    DRRosen3

    Joined:
    Jan 30, 2014
    Posts:
    683
    We ended up switching the Blend Mode to Alpha, and adjusting our textures accordingly. Thanks for the help!
     
    DRRosen3, Oct 27, 2022
    #5
    richardkettlewell likes this.