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ParticleStrip smearing, ghosting, flickering…

Discussion in 'Visual Effect Graph' started by tom2918, Oct 14, 2020.

  1. tom2918

    tom2918

    Joined:
    Jun 4, 2018
    Posts:
    8
    Hi, I’m struggling with artifacts on moving particles lines. They look nice in the VFX RibbonPack sample, but when they are thinner and move faster, they show strong artifacts. It looks like an antialias problem. Currently using TAA and the other options are even worse. Tried to find a solution the last days without success. Any help or hint will be highly appreciated.

    Screenshots: https://www.dropbox.com/s/az6t6nq6r6sa01r/artifacts.mov?dl=0

    Many thanks!
     
    tom2918, Oct 14, 2020
    #1

  2. JulienF_Unity

    JulienF_Unity

    Unity Technologies

    Joined:
    Dec 17, 2015
    Posts:
    306
    Hi, this seems like a specific issue with TAA.

    Particle strips don't generate motion vectors at the moment, so they are very prone to TAA issues like ghosting. Adding motion vector generation for strips is planned.
     
    JulienF_Unity, Oct 15, 2020
    #2

  3. tom2918

    tom2918

    Joined:
    Jun 4, 2018
    Posts:
    8
    Thank you for your response! When will strips get motion vectors? I'm preparing this for an exhibition in two weeks. Maybe there is a workaround for the time being you can suggest? An additional problem is that the smearing ignores stereoscopic depth. So the visuals look even more messy in stereo.
     
    tom2918, Oct 16, 2020
    #3

  4. JulienF_Unity

    JulienF_Unity

    Unity Technologies

    Joined:
    Dec 17, 2015
    Posts:
    306
    When you say other AA solutions than TAA are even worse, what's the issue exactly? From your video it seems to be TAA artifacts.
     
    JulienF_Unity, Oct 16, 2020
    #4