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https://github.com/zerdicorp/soft_body_simulation

In my opinion - one of the coolest simulations!
https://github.com/zerdicorp/soft_body_simulation

2d physics physics-simulation simulation soft-body soft-body-simulation

Last synced: 10 months ago
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In my opinion - one of the coolest simulations!

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# soft_body_simulation :panda_face: :soccer:

#### In my opinion - one of the coolest simulations!



## What can you say about it? :raising_hand:

_**I have only two words for you: INCREDIBLY COOL!**_



I've always wanted to create some kind of simulation related to physics.  

And finally, **I did it**!  



_P.S. The work I have done is not perfect.  

I didn't go deep into formulas.  

I didn't try to create a comprehensive universal soft body engine.  

Not at all.  

I am driven only by wild curiosity, what are you talking about? :D_



## How it works? :hatching_chick:

> Everything written below is just a **crooked interpretation** of the coolest articles on **soft body physics**.  

> Want two-page formulas and buzzwords? Google it! :3

> 

> _Who seeks will find._  

> _Whoever goes will come._  

> _Those who google will not notice the answer in the first link._



### #1 ~ «Introduction»

Well, let's understand how **soft body simulation** works.  



First, we need to understand **what the body itself** is. And by the way, it won't take long to find the answer (that's why I'm here lol):

- Particles



Yes, **particles** are everywhere.  

It is from these little freaks that everything around us consists: the phone that you hold in your hands, and the hands themselves.  



And, you know, if you want to create a **soft body**, you don't have to **beat around the bush** - **steal the idea from nature**!



### #2 ~ «Particles»

_So, okay, we have particles. But what exactly are they?_



Here is the basic set of properties for each **particle**:

- **location**

- **velocity**



I mean, it's pretty primitive.  

We have a particle location **(x, y)** and a **velocity vector**.  

It remains for each frame to update the location, adding velocity to it.  



_It's all? Do we have a soft body?_



**Lol, no.. :D**



### #3 ~ «Springs»

Having only **particles**, you can get, for example, a **gas**, but obviously not a **soft body**, because, as you know, a body is a body, because it is an **ordered set of interconnected particles** (_crystal lattice_).  



And, if we were making a regular **rigid body**, we wouldn't even have to tie anything.  

But here's a **soft body**..  

It should behave like **jelly**, or any other **soft** object, that is, **deform, and then recover**.  



And the **«Spring Mass System»** will help us to achieve this effect.  



I will not retell [smart definitions from Wikipedia](https://en.wikipedia.org/wiki/Soft-body_dynamics), but I will explain in simple words:  



Our task is to **split the particles into pairs**. Each pair forms a **spring**.  

Next, we need to go through all the **springs** (_pairs of two particles_) and, based on some data, calculate the **next position of the particles** in space.  



Thus, the **particles become bound to each other**.  

And the **system of spring masses** allows you to achieve the effect of **jelly**, since when the particles move away from each other, they are forced to move towards each other (**spring compression**), otherwise, if the particles are too close to each other (closer than a certain distance / **state of rest**), they forced to move in opposite directions (**stretching the spring**).  



Summarizing the above, we have:

- **Particles**

- **Springs (a pair of two particles)**



This is actually enough to create a **soft body**.  



### #4 ~ «Soft body»

Well, let's briefly go through the main steps:

1. Create **particles**.

2. Connect them with **springs**.

3. Iterate through the springs every frame and apply all **sorts of tricky formulas** to achieve the spring effect (move away the particles - they return to each other; bring the particles closer - they push each other with all their might; stretch the spring and release it - it will contract and stretch, making **harmonic oscillations**, until it reaches a **state of rest**).



Apart from the **spring mass system**, you will probably need a **gravity simulation** (just add a constant to the y-axis of the velocity vector every frame), a **collision resolution algorithm** (because you don't want your soft body to fall forever) and **a lot of curiosity** (no way without it)!  



## Demo 🔥



  

    

  




## Thanks! Gonkee :sparkling_heart: (u r cutie btw)

* #### [But How DO Soft Body Simulations Work?](https://www.youtube.com/watch?v=kyQP4t_wOGI&t=527s&ab_channel=Gonkee) by Gonkee