Search Unity

  1. Megacity Metro Demo now available. Download now.
    Dismiss Notice
  2. Unity support for visionOS is now available. Learn more in our blog post.
    Dismiss Notice

What is the relationship between particle Start Speed and Velocity over Lifetime?

Discussion in 'General Graphics' started by viveadam, Jul 13, 2020.

  1. viveadam

    viveadam

    Joined:
    May 4, 2020
    Posts:
    5
    I'm a little unclear on what the relationship is between the particle "start" attributes and the "over time" attributes. For example, it seems like the "over time" attributes have more influence, but if I set the start size to 0, particles stay at scale 0. Is "over time" a percent then? If so, a percent of what? Similarly, for velocity, does the "over time" velocity get added to the start speed? Or is it multiplied? Or what?

    Sorry if this is a basic question, but it's something I've never been clear on.

    Thanks!
     
  2. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    2,281
    For velocity, I believe the “over lifetime” module replaces the start speed.

    For color, the modules multiply with the start color.
     
    viveadam likes this.
  3. viveadam

    viveadam

    Joined:
    May 4, 2020
    Posts:
    5
    Awesome, thanks! Do you happen to know for scale?
     
  4. richardkettlewell

    richardkettlewell

    Unity Technologies

    Joined:
    Sep 9, 2015
    Posts:
    2,281
    That’s a multiplier too.
     
    viveadam likes this.