JavaFX Fluid Simulation

[boreal socket]

hm looks fine to me

might need more context

[grand garnet]

ok updated master 3

[boreal socket]

going to check in like 10min

[grand garnet]

ok sure

[boreal socket]

it is because you forgot to set simulationStarted = false in the endSimulation method

[grand garnet]

ohhh

wait nvm 😭

[boreal socket]

yeah thats fine

thats the use of interrupted

[boreal socket]

it still works fine right?

[grand garnet]

nope i can still interact with it

[boreal socket]

oh you might need a break in that statement

in the try catch

also the error is printing because of e.printStacktrace()

[grand garnet]

here?

[grand garnet]

yeahh

[boreal socket]

also I still recommend not to use Thread.sleep here

[grand garnet]

does the UI look nice btw?

[grand garnet]

what should i use instead?

[boreal socket]

yeah why not, but it could get some improvements

[boreal socket]

I would slightly do the loop differently

[grand garnet]

YES IT WORKS

[grand garnet]

coudl you elaborate?

[boreal socket]

I would have a continous loop (while(true), which will update fluid.step as fast as possible), but only render the n number of times per second based on the FPS you try to implement

[grand garnet]

ahh so theres no set TPS?

[boreal socket]

yeah, why would you want tps?

ok there are some reasons

[grand garnet]

to prevent too many updates?

[boreal socket]

but I wouldnt do it in this case

[grand garnet]

oh

i mean it works fine for now maybe later i can change it

[boreal socket]

you probably wont change it

whatever

your simulation

I would do it differently but 🤷‍♂️

[grand garnet]

i will if i have time 😭

I gotta do the whole writeup and everything

[boreal socket]

all good its fine

[grand garnet]

so this is all a rush from now on

[boreal socket]

yeah try to get it working first

[grand garnet]

yeahh

it works good now

I got two main bits left which is the implementation of barriers

and recording the fluid e.g. saving the fluid data somewhere in a file

[boreal socket]

btw in which way do you want to store recordings?

[cedar tiger]

@grand garnet

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[grand garnet]

hmm not so sure yet

probably save the arrays and just re render

maybe i can implement some sort of compression

[boreal socket]

Yeah otherwise it’s going to be really big

Just store the changes or smth might be the best idea to easily implement

[cedar tiger]

@grand garnet

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[grand garnet]

hello guys

[grand garnet]

wdym the changes

ohh you mean the fluid inputs?

[boreal socket]

yeah or smth like that

[grand garnet]

ahh ok

i got a quick question

so i'm just looking at the input handling stuff

for (FluidInput source : sourceQueue) {
       sourceConsumer.accept(source);
}

sourceQueue.clear();```

is it more efficient doing this or is it more efficient dequeuing a node one at a time and then accepting it

[cedar tiger]

@grand garnet

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[grand garnet]

hello

got some bad news

teacher doesn't like the fact that i used a List in my queue class 😭

package com.fluidity.program.utilities;

import java.util.ArrayList;
import java.util.List;
import java.util.NoSuchElementException;

public class Queue<T> {
    private List<T> queue;
    private int MAX_SIZE;

    public Queue() {
        this.queue = new ArrayList<>();
    }

    public void enqueue(T data) {
        if (queue.size() == MAX_SIZE && MAX_SIZE != 0) {
            throw new ArrayIndexOutOfBoundsException();
        }
        queue.add(data);
    }

    public T dequeue() {
        if (isEmpty()) {
            throw new NoSuchElementException();
        }

        return queue.remove(queue.size() - 1);
    }

    public T peek() {
        return queue.get(queue.size() - 1);
    }

    public boolean isEmpty() {
        return queue.isEmpty();
    }

    public void setMAX_SIZE(int MAX_SIZE) {
        this.MAX_SIZE = MAX_SIZE;
    }

    public int size() {
        return queue.size();
    }

    public Queue<T> copy() {
        Queue<T> copy = new Queue<>();
        copy.queue = new ArrayList<>(queue);
        copy.setMAX_SIZE(MAX_SIZE);
        return copy;
    }

    @Override
    public String toString() {
        StringBuilder output = new StringBuilder();
        for (T t : queue) {
            output.append(t.toString())
                    .append(" ");
        }
        output.append("\n");
        return output.toString();
    }
}

this is my queue implementation

however he doesn't like that I use the list for it 😭

[lilac marlin]

Did he give any feedback on what he wants instead? I haven't checked the full topic given it's length.

[grand garnet]

yeahh he said to use an array implementation

and then change lengths manually

i implemented it and it works fine

thing is im planning to do some sort of fluid saving so I can backtrack though the fluid

@Override
    public void run() {
        this.running = true;
        this.FLUID_WIDTH = fluid.WIDTH;
        this.FLUID_HEIGHT = fluid.HEIGHT;

        final double TIME_PER_TICK = 1.0 / TPS;
        final double TIME_PER_FRAME = 1.0 / DESIRED_FPS;
        long lastTime = System.nanoTime();
        double unprocessedTime = 0;
        double frameTime = 0;

        while (running) {
            long now = System.nanoTime();
            long passedTime = now - lastTime;
            lastTime = now;
            unprocessedTime += passedTime / 1_000_000_000.0;
            frameTime += passedTime / 1_000_000_000.0;

            // Update fluid and handle inputs as many times as needed to catch up with the target TPS
            while (unprocessedTime > TIME_PER_TICK) {
                fluid.step(TIME_PER_TICK);
                addSourcesFromUI(fluid);
                unprocessedTime -= TIME_PER_TICK;
            }

            // Render if it's time for a new frame
            if (frameTime >= TIME_PER_FRAME) {
                if (densityPlot) {
                    render(fluid.dens.clone()); // Render with the most recent fluid density
                } else if (xVelocityPlot) {
                    render(fluid.u.clone()); // Render with the most recent fluid density
                } else if (yVelocityPlot) {
                    render(fluid.v.clone()); // Render with the most recent fluid density
                }

                frameTime = 0;
            }

            // Sleep to cap the rendering FPS
            long sleepTime = (long) ((TIME_PER_FRAME - frameTime) * 1_000_000_000);
            if (sleepTime > 0) {
                try {
                    Thread.sleep(sleepTime / 1_000_000, (int) (sleepTime % 1_000_000));
                } catch (InterruptedException e) {
                    e.printStackTrace();
                    break;
                }
            }
        }
    }```

[cedar tiger]

Detected code, here are some useful tools:

Formatted code

@Override
public void run() {
  this .running = true;
  this .FLUID_WIDTH = fluid.WIDTH;
  this .FLUID_HEIGHT = fluid.HEIGHT;
  final double TIME_PER_TICK = 1.0 / TPS;
  final double TIME_PER_FRAME = 1.0 / DESIRED_FPS;
  long lastTime = System.nanoTime();
  double unprocessedTime = 0;
  double frameTime = 0;
  while (running) {
    long now = System.nanoTime();
    long passedTime = now - lastTime;
    lastTime = now;
    unprocessedTime += passedTime / 1_000_000_000.0;
    frameTime += passedTime / 1_000_000_000.0;
    // Update fluid and handle inputs as many times as needed to catch up with the target TPS
    while (unprocessedTime > TIME_PER_TICK) {
      fluid.step(TIME_PER_TICK);
      addSourcesFromUI(fluid);
      unprocessedTime -= TIME_PER_TICK;
    }
    // Render if it's time for a new frame
    if (frameTime >= TIME_PER_FRAME) {
      if (densityPlot) {
        render(fluid.dens.clone());
        // Render with the most recent fluid density
      }
      else if (xVelocityPlot) {
        render(fluid.u.clone());
        // Render with the most recent fluid density
      }
      else if (yVelocityPlot) {
        render(fluid.v.clone());
        // Render with the most recent fluid density
      }
      frameTime = 0;
    }
    // Sleep to cap the rendering FPS
    long sleepTime = (long ) ((TIME_PER_FRAME - frameTime) * 1_000_000_000);
    if (sleepTime > 0) {
      try {
        Thread.sleep(sleepTime / 1_000_000, (int ) (sleepTime % 1_000_000));
      } catch (InterruptedException e) {
        e.printStackTrace();
        break ;
      }
    }
  }
}

[grand garnet]

this doesn't really require any prerequisite knowledge about the simulation but how can I save the fluid at 10fps whilst the simulation is running at 60fps?

anyone know?

i was thinking of having a frameCount variable and resetting it every 10 frames that are rendered?

[hollow sage]

how tf does this thread has 3k messages, what happened here 💀

[slender kindle]

it changed on auto close time, OP asked to be open for a while

[lilac marlin]

before your if (frameTime >= TIME_PER_FRAME) { a modulus operator on frameTime to check if it's 0 and then log it?

[grand garnet]

yeah but this is for a 60fps loop

i want it so that no matter what TIME_PER_FRAME is, I can do some other functionality at the same time but at 4 FPS or something

unlesse the FPS < 4fps

which it wont be

because minimum is 15 in my sim

[lilac marlin]

But before that you can just put another if ((frameTime % (TIME_PER_FRAME/6)) == 0) you'd do it once every 10 FPS

[grand garnet]

ahhh yeah i get that

doesn't work 😭

btw frameTime isn't the current FPS

[cedar tiger]

@grand garnet

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[grand garnet]

.

helloooooo

just a quick question

if i plan to rollback the fluid, should i still be using a loop to render the rollbacks?

[grand garnet]

is there a method which makes sure a key can't be held but only pressed?

[upbeat narwhal]

:DD

[grand garnet]

sorry 😭

i just struggle with jfx lol

[upbeat narwhal]

nahh ur good

no one cares that u sent 3k messages

[grand garnet]

😭

have i seen u somewhere

wait

maths server maybe

[upbeat narwhal]

yea above

[grand garnet]

and above 😭

[upbeat narwhal]

ok me no pollute ur thread

good luck with it

[grand garnet]

no worries i dn't care much

thanks though

[lilac marlin]

in which regards?

[grand garnet]

doesn't run it at all

i justr made a variable which counts the number of frames

[cedar tiger]

@grand garnet

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[grand garnet]

hi

how do i make sure that the arrow keys don't affect sliders?

[median ingot]

Feels like a new question

[boreal socket]

If it’s just about that you would just add an event filter

[grand garnet]

i did but it doesnt work

[boreal socket]

ok?

share what you did

how am I supposed to help you otherwise?

[grand garnet]

oh yeah sorry

i thought u would know it's on master3 lmao

https://github.com/Pentium37/Fluidity/tree/master3

[boreal socket]

Okay yeah actually mb

[cedar tiger]

@grand garnet

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[grand garnet]

no worriesss

awake at 5:47 😭

[mint hawk]

this thread has 3118 messages

[cedar tiger]

@grand garnet

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[grand garnet]

helellalooooo

[grand garnet]

not anymore

[drifting hinge]

lol

[grizzled inlet]

let this thread rest it peace now

ur bullying

[upbeat narwhal]

let thread sleep

[drifting hinge]

Thread.sleep(Long.MAX_VALUE);

[cedar tiger]

@grand garnet

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[grizzled inlet]

i aplogize for reactinge to the message

[upbeat narwhal]

bros thread so inactive it got closed

[grand garnet]

😭

im just looking back on it for writing my writeup

hey @boreal socket when this thing kept causing my program to freeze, what can i say was the problem that we fixed using all the daemon and executor stuff?

[boreal socket]

not sure which freeze you are referring to

but setting it daemon is technically unrelated

[grand garnet]

well just the reason why I replaced my delta tome loop with urs tbh

[grand garnet]

daemon is for closing right?

[boreal socket]

I cant tell anymore tbh

but I think the freeze wasnt caused by the loop itself

it was caused by the underlying code

which was failing somehow before

but I cant tell anymore

[cedar tiger]

@grand garnet

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[grand garnet]

eh it's fine i waffled it

I kinda just need help trying to explain what an ExecutorService and setDaemon is in words

[boreal socket]

ok

what you got so far?

[grand garnet]

The fluid seems to flow in the direction of a velocity field that is transformed when a force is applied on the field. This is the kind of output that we require and it is the output which was required by our stakeholders for an ``intuitive" understanding. On top of this fix to the error, I have added some features that were meant to be added later but are however needed for now. This involves the use of what we call an ExecutorSerice and a specific attribute known as daemon.```

[boreal socket]

hm thats not really what the executor is used for here

you used it to run your simulation next to the javafx thread

without interfering it and thus blocking it

[grand garnet]

ahh ok

[boreal socket]

also I just see that you removed Platfom.runLater call

dont do that

your threaded application isnt really safe

[grand garnet]

it starts lagging 😭

[boreal socket]

then you did something else wrong

[grand garnet]

is this what an ExecutorService does?

[boreal socket]

you try to fix a bug with something completely unrelated

[boreal socket]

and thus creating a different problem/bug

[boreal socket]

I would summary ExecturoService contextless like this:
ExecutorService is an enhanced API to create Threads. It produces Future objects for tracking progress of one or more asynchronous tasks

in your case the task is the simulation

you want it to be threaded so that your javafx thread (rendering and stuff) wont get blocked by the simulation

you set the created thread for the simulation daemon, so that it wont block terminating the whole application if the javafx thread (aka all non-daemon threads) finished/failed/etc

Platform threads are designated daemon or non-daemon threads. When the Java virtual machine starts up, there is usually one non-daemon thread (the thread that typically calls the application's main method). The shutdown sequence begins when all started non-daemon threads have terminated. Unstarted non-daemon threads do not prevent the shutdown sequence from beginning.

[grand garnet]

ah yes the run later works

[boreal socket]

only wrap it around the stuff that actually needs it though

[grand garnet]

yep

[boreal socket]

so changing the pixels on the canvas

[grand garnet]

only the render methdo

bro

i haven't slept in 2 days no joke

im gonna get a heart attack or smth 😭

i drank 5 monster energies today

need to finish this documentation 💀

[boreal socket]

bro be careful

water >>

[grand garnet]

yeahh

also

what exactly does the run later do and what does it solve?

idk how to put it in words lmao

[boreal socket]

it lets you run code on the JavaFX thread

so the render method is called on your custom thread

but you want to do stuff on the javafx thread

Platform.runLater gives you that ability

[grand garnet]

ahh

[boreal socket]

though you need to be careful

[grand garnet]

what does the later mean though?

during the next available time?

[boreal socket]

Run the specified Runnable on the JavaFX Application Thread at some unspecified time in the future.

[boreal socket]

yea

NOTE: applications should avoid flooding JavaFX with too many pending Runnables. Otherwise, the application may become unresponsive. Applications are encouraged to batch up multiple operations into fewer runLater calls. Additionally, long-running operations should be done on a background thread where possible, freeing up the JavaFX Application Thread for GUI operations.

[cedar tiger]

@grand garnet

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[grand garnet]

Hi

[grand garnet]

yes

also

I just want to say a huge thanks to @boreal socket , @steep elbow and @dense hare for helping me along this project lmao

i've come a long way ngl

and it's looking good rn

just trying to speedrun the writeup now

but i've done all the programming

they don't care about the niche features

so im getting rid of the recordings

[upbeat narwhal]

i don’t know how but i only just realized ur making a fluid simulation

i’m very much impressed and good luck with ur journey

[cedar tiger]

@grand garnet

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[grand garnet]

is there a way to generate a UML diagram for an intelliJ project?

[boreal socket]

there are some plugins

[grand garnet]

what's a good one?

[boreal socket]

🤷‍♂️

google ig

[cedar tiger]

@grand garnet

Your question has been closed due to inactivity.

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[grand garnet]

How do i reset a scene completely?

like say if i want a scene to be reset on the click of a button

hey @boreal socket what does this mean?

[boreal socket]

uh it got rejected?

lol

[grand garnet]

what got rejected 😭

[boreal socket]

your runnable

[grand garnet]

oh no

[boreal socket]

I guess your executor just got one thread

[grand garnet]

i think i reset my scene wrong 😭

[boreal socket]

and there is still running a different runnable on that

yeah probably

[grand garnet]

    public void resetScene(ProgramState scene) {
        initialiseUI(scene);
        setManager(scene);
        loadScene(scene);
    }```

[cedar tiger]

Detected code, here are some useful tools:

[grand garnet]

    @FXML
    private void onGoToSettingsClick() {
        simulationStarted = false;
        simulationFuture.cancel(true);
        EXECUTOR.close();
        manager.resetScene(ProgramState.SIMULATION);
        manager.loadScene(ProgramState.SETTINGS);
    }

[cedar tiger]

Detected code, here are some useful tools:

[grand garnet]

I end it like that

[boreal socket]

oh, you closed the executor

and probably never reinitialize it

[grand garnet]

ahh

yeah

it works

[boreal socket]

also thats not how you properly shutdown an executor service iirc

[grand garnet]

oh

i'll search it up

tysm though!

[boreal socket]

there is this, but idk

[grand garnet]

pretty sure that is my very last bug to talk about in the writeup

[boreal socket]

need to further read the docs

[drifting hinge]

Dang I read thru half of your convo, this stuff is interesting

how far are you done?

Is it fully concurrent?

[cedar tiger]

@grand garnet

Your question has been closed due to inactivity.

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to reopen it, or create a new thread.

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With enough info, someone knows the answer for sure 👍

[grand garnet]

hey guys

time for the comeback

how do i run this in CLI 😭

[grand garnet]

wdym

i finished all the coding and stuff and i've sent it in

it says this 🫥

[dense hare]

how are you creating the jar?

[drifting hinge]

the processing, is it multi-threaded?

did you create a fat jar?