Quick Links: Download Gideros Studio | Gideros Documentation | Gideros community chat | DONATE
Variable time step — Gideros Forum
  • Home
    • ›

    Variable time step

    billydbbillydb Member
    in General questions
    Hi I've been trying to find out how to get the box2d stuff to not slow down on low end phones and best I can tell it needs a variable (or mixed variable and fixed) time step in the World:step instead of the fixed 1/60. Does anyone have an example of this or tutorial to point to, all I can find is Unity or Cocos tuts that sort of help but I usually get stuck with the different languages
    +1 -1Share on Facebook

    Comments

    • piepie Member
      @billydb please post a link to one of those tutorials to help helping :)
      +1 -1Share on Facebook
    • billydbbillydb Member
      https://gafferongames.com/post/fix_your_timestep/
      +1 -1Share on Facebook
    • billydbbillydb Member
      If there's any way someone can translate that to lua / gideros that's be awesome! I am way to dumb for this :)
      +1 -1Share on Facebook
    • SinisterSoftSinisterSoft Maintainer
      set the step to the delta - here you are (in your frame event):
      local delta=e.deltaTime
world:step(delta,1,5) -- instead of 1 and 5  use whatever you have now.

      Likes: totebo

      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
      +1 -1 (+1 / -0 )Share on Facebook
    • billydbbillydb Member
      The problem is it's very unstable and breaks things randomly when your framerate fluctuates. Has anyone seen a lua version of the variable time step setup? I kind of get that you record your previous frame times and create a time step based on the average of the last 10 or frames but my attempts to implement have ended in disaster :)
      +1 -1Share on Facebook
    • SinisterSoftSinisterSoft Maintainer
      No, you base the movement on the time from the last frame to the current one - the delta. No need to average it out.
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
      +1 -1Share on Facebook
    • billydbbillydb Member
      Yeah but I mean basing it on delta time is unstable so there’s some sort hybrid between a fixed time and delta time that isn’t unstable, according to that article, but I’m failing to implement it
      +1 -1Share on Facebook
    Sign In or Register to comment.