Sign in to follow this  
Beeeph

Unity How to simulate pressure with particles?

Recommended Posts

I'm trying to simulate pressure with a collection of spherical particles in a Unity game I'm building. A couple notes about the problem:

- The goal is to fill a constantly changing 2d space/void with small, frictionless spheres. The game is trying to simulate the ever-growing pressure of more objects being shoved into this space.

- The level itself is constantly scrolling from left to right, meaning if the space's dimensions are not changed by

the user it will automatically get smaller (the leftmost part of the space will continually scroll off-screen).
I'm wondering what some approaches are that I can take to tackling these problems...

1. Knowing when to detect when there is space to fill and then add spheres to the space.
2. Removing spheres from the space when it is shrinking.
3. Strategies to simulate pressure on the spheres such that they "explode outwards" when more space is created.

The current approach I am contemplating is using a constantly moving wall, that is off screen and moves with the screen, as the attached image illustrates.

This moving wall will push and trap the spheres into the space. As for adding new spheres, I was going to have either (1) spheres replicate themselves upon detecting free space, OR (2) spawn them at the left side of the space (where the wall is) - pushing the rest of the spheres to fill the space. I foresee problems with idea #1 because this likely wouldn't really create/simulate pressure; idea #2 seems more promising, but raises the question of how to provide a location for these new sphere particles to spawn (and the ramifications of spawning them when there IS no space).

Thanks so much in advance for your wisdom!

Share this post


Link to post
Share on other sites
Take a look at [url="http://en.wikipedia.org/wiki/Coulomb_law"]http://en.wikipedia.org/wiki/Coulomb_law[/url] (coulomb's law). It is used in [url="http://en.wikipedia.org/wiki/Force-based_layout"]http://en.wikipedia....ce-based_layout[/url] (Force-based graph drawing).

You can use coulomb's law between all the particles, and then they will repel each other.
More particles will give more tension or pressure. Edited by Lars-Kristian

Share this post


Link to post
Share on other sites
Pressure can be seen as the sum total of all the particles colliding with the container's walls over a period of time. If you're looking to go the realistic route you could give all your particles an initial kinetic energy based on the temperature of the fluid you're simulating, and if you use elastic collisions you should find that as you decrease the volume there are more particle collisions per second.

Share this post


Link to post
Share on other sites
I would go woth a dynamic vector.fiekd where its a vector field that details pressure differential with direction and magnitude. the origins of each vector would be laid out as a grid.

To calculate the vector flow fiekd id have the same sort of grid but this one would be a scalar field that sources its values from the scene. Then calculate the flow vectors.'technically a tensor field' and it's done

typos phone and some body probably already said this.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

  • Partner Spotlight

  • Forum Statistics

    • Total Topics
      627654
    • Total Posts
      2978444
  • Similar Content

    • By STRATUM the Game
      Hey, everyone! This is my first post here.
      I would like to know what you think about my project called STRATUM. It's a 2D platformer that is heavily based on storytelling and boss fighting while trekking through the world.

      Everything in STRATUM takes place in the first century AD, in a world that wraps our own universe, called  The Stratum. A parallel Universe that is the home of the Christian deities . In this game you will play as a Dacian warrior, unfamiliar with everything in this world, you’ll get to know and understand The Stratum together with him.
      The main thing that I want with STRATUM is to reinvent the known lore and history of the Christian deities and realms. 
      The story is unconventional, it plays down a lot of the mysticism of Hell or Heaven and it gives it a more rational view while keeping the fantastic in it. What do I mean by that? Well, think about Hell. What do you know about it? It's a bad place where bad people go, right? Well, that's not the case in STRATUM. I don't want to describe such a world. In STRATUM, there is a reason for everything, especially for the way Hell is what it is in the game. "Hell" is called The Black Stratum in the game.
      This world is not very different from Earth, but it is governed by different natural laws.
      The story will also involve the reason why this world entered in touch with ours.

       
      What do you think about all that I said? Would you be interested in such a game? I have to say that everything is just a work of fiction made with my imagination. I do not want to offend anyone's beliefs.
      I want this to be a one man game. I have been working alone on it (this was my decision from the beginning) from art to effects to programming to music to sound effects to everything.
      I also have a youtube video HERE if you want to see the way the game moves and the way my music sounds.
      Please, any kind of feedback will be highly appreciated. If you have something bad to say, do it, don't keep it for yourself only. I want to hear anything that you don't like about my project.
       
    • By LimeJuice
      Hi, it's my first post on this forum and I would like to share the game I am working on at the moment.
      Graphics have been made with Blender3D using Cycle as a renderer and I am using Unity3D. It's a 2D game, one touch side-scrolling game for iOS and Android.
      Here some pictures, and you can have a look to the gameplay on this video :
      Feedbacks ?
      And if you want to try it, send me your email and I will add you to the beta tester list!
       
       








    • By Kirill Kot
      An adventure indie game with quests in a beautiful, bright world. Characters with unique traits, goals, and benefits. Active gameplay will appeal to players found of interactivity, especially lovers of quests and investigations.
      Available on:
      Gameroom (just open the web page and relax)
      AppStore
      GooglePlay
      WindowsPhone

    • By Kirill Kot
      Big Quest: Bequest. An adventure indie game with quests in a beautiful, bright world. Characters with unique traits, goals, and benefits.
      Mobile game, now available on Gameroom. Just open the web page and relax.
    • By Kirill Kot
      Big Quest: Bequest. An adventure indie game with quests in a beautiful, bright world. Characters with unique traits, goals, and benefits.
      Mobile game, now available on Gameroom. Just open the web page and relax.
  • Popular Now