# 🌊 Fluid.js 🌊
A JavaScript library that allows for easy deployment of WebGL rendered fluid simulations based on the Navier-Stokes Equations for Incompressible Flow.
Set up is easy and customization is rich, get a beautifully rendered WebGL fluid simulation running in your responsive web project in less than five minutes.
This library is an extension on the fluid simulation implemented by [PavelDoGreat](https://github.com/PavelDoGreat/WebGL-Fluid-Simulation).
> This project is in early-development and open to contribution. Do not use this library in your production level project unless you have properly evaluated the performance and browser compatibility.
Getting Started
--
###### CDN
```HTML
```
###### Terminal
```shell script
npm i fluid-canvas
```
###### Clone
```shell script
git clone https://github.com/malik-tillman/Fluid-JS.git
```
Usage
--
##### Add Fluid.js to your ``
```html
Fluid JS Example
```
##### Create a `canvas` element to render the fluid
> Give it an identifier to reference in javascript
```html
. . .
```
##### Now we can initialize the `canvas` as our fluid's surface
```javascript
import Fluid from 'fluid';
const canvas = document.getElementById('renderSurface');
let myFluid = new Fluid(canvas);
myFluid.activate();
```
> Or do it with an inline script tag
```html
```
##### You may also want to add some styles
```css
body {
margin: 0;
}
canvas {
width: 100vw;
height: 100vh;
}
```
##### Full Example Code
```html
Fluid JS Example
```
Configuring Fluid Behavior
--
There are two ways you can configure the fluid simulation's behavior.
#### Mapping Behaviors
---
Map multiple behavior properties at once.
> `.mapBehaviors` does not dynamically assign values. This means you must `.activate` your fluid every time you map new behavior properties.
##### Syntax
```javascript
fluid.mapBehaviors({
property: value
});
```
##### Example
```javascript
fluid.mapBehaviors({
sim_resolution: 128,
dye_resolution: 512,
paused: false,
embedded_dither: true,
dissipation: .97,
velocity: .98,
pressure: .8,
pressure_iteration: 20,
curl: 0,
emitter_size: 0.5,
render_shaders: true,
multi_color: true,
render_bloom: false,
bloom_iterations: 8,
bloom_resolution: 256,
intensity: 0.8,
threshold: 0.6,
soft_knee: 0.7,
background_color: { r: 15, g: 15, b: 15 },
transparent: false
});
fluid.activate();
```
> These are the main behavior configurations. Documentation on each property and how to use them is currently in the works.
#### Dynamic Assignment
---
This method allows for most fluid behaviors to be adjusted `on-the-fly`. This means you can change a property without having to re-activate your simulation.
##### Syntax
```javascript
fluid.PARAMS.property = value;
```
##### Example
```javascript
fluid.PARAMS.curl = 25;
```
> Documentation in-progress
#### Changing Background
---
You may set the background mode to `'solid'`, `'gradient'`, or `'image'`. Applying a background requires you specify a mode and a value for that mode. You also have the option of adding addition configurations for the background.
> The value is the same it would be if you was using regular CSS.
##### Syntax
```javascript
fluid.applyBackground(mode, value, options);
```
##### Example
```javascript
// Solid Background
fluid.applyBackground('solid', '#e66465');
// Gradient Background
fluid.applyBackground('gradient', '#e66465, #9198e5', 'linear');
fluid.applyBackground('gradient', '#e66465, #9198e5', 'radial');
fluid.applyBackground('gradient', '#f69d3c, #3f87a6', 'conic');
fluid.applyBackground('gradient', '#f69d3c, #3f87a6 50px', 'repeating-linear');
fluid.applyBackground('gradient', '#f69d3c, #3f87a6 50px', 'repeating-radial');
// Image Background
fluid.applyBackground(
'image',
'./image.jpg',
{
repeat: 'repeat',
position: 'center',
size: '100px',
color: 'none'
}
);
```
> Documentation in-progress
#### Setting Dither
---
By default, the simulation will utilize the embedded dither. But you have the option to use a custom image.
For this set `.PARAM.embedded_dither` to `false`. This will search for a dither image in `ROOT/assets/dither.png`.
```javascript
fluid.PARAMS.embedded_dither = false;
```
You may also change this default path with `.setDitherURL`.
```javascript
fluid.setDitherURL('../images/myDither.png');
```
> Documentation in-progress
Browser Support
--
These browsers are guaranteed working as per my testing:
- Chrome
- FireFox
- Safari
- Opera
- Edge (IE11)
References
--
- [Mozilla WebGL Docs](https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API)
- [Fast Fluid Dynamics Simulation on the GPU](http://developer.download.nvidia.com/books/HTML/gpugems/gpugems_ch38.html)
- [Based on PavelDoGreat's Fluid Simulation](https://github.com/PavelDoGreat/WebGL-Fluid-Simulation)
- [MHarr's Fluids-2d with ThreeJS](https://github.com/mharrys/fluids-2d)
- [Haxiomic's GPU-Fluid-Experiment](https://github.com/haxiomic/GPU-Fluid-Experiments)