A gallery for images and models rendered as particles with three.js
- three.js - A Javascript 3D Library
- WebGL Enabled Browser
Download the minified script as well as a copy of three.js and include it in your markup.
<script src="js/three.min.js"></script>
<script src="js/particlesaga.min.js"></script>To prepare ParticleSaga scene you'll then need to define a set of targets (images and/or models) to map the particles to.
var targets = [
{
type: ParticleSaga.ImageTarget,
url: 'images/excellent.png',
options: {
size: 3
}
}, {
type: ParticleSaga.ModelTarget,
url: 'models/unicorn.json',
options: {
color: {
r: 0.8,
g: 1,
b: 1
},
scale: 1.5,
size: 3,
respondsToMouse: true
}
}
];Next you just need to instantiate a scene with this target data and then either start a slideshow or control the sequence manually.
// The scene's context element contains the canvas
var saga = document.getElementById('saga');
var scene = new ParticleSaga.Scene(saga, targets, {
numParticles: 40000,
sort: ParticleSaga.VertexSort.leftToRight
});
// init will make all targets begin loading assets
// and create everything else needed in the scene.
scene.load(function() {
scene.setTarget(0);
scene.startSlideshow();
});All targets need to be defined in with json and passed into the scene constructor. The definition consists of the target type, an asset URL, and a set of options. Optionally you can include a container element to assist with sizing and positioning of the particle display - the scene's context element will be used by default.
ImageTargets generate particles in the XY plane based on random non-transparent pixels. The particles are scaled to fill the container using an aspect-fill scaling.
For best results you should use a high-contrast image with transparent negative space and a lot of padding around content you don't want to have cropped since it's going to be scaled to fill the container.
Example definition:
{
type: ParticleSaga.ImageTarget,
url: 'images/excellent.png',
options: {
size: 3
}
}Attributes
| Property | Type | Description |
|---|---|---|
| type | Value must be ParticleSaga.ImageTarget |
The target class (must extend ParticleSaga.AbstractTarget) |
| url | String |
Path to the image |
| container | Element |
Element to constrain position of target with. Default is the scene's context |
| options | PlainObject |
Options list to override default values described below |
Options
| Property | Type | Description |
|---|---|---|
| respondsToMouse | Boolean |
Whether or not to rotate the particle system along with the mouse position. Default is false |
| size | Number |
Sets the size of the particles. Default is 1.0 |
ModelTargets load a json mesh file using a THREE.JSONLoader. You can find model exporters here.
Example definition:
{
type: ParticleSaga.ModelTarget,
url: 'models/unicorn.json',
options: {
color: {
r: 0.8,
g: 1,
b: 1
},
initialMatrices: [
new THREE.Matrix4().makeTranslation(0, -2, 0),
new THREE.Matrix4().makeRotationY(Math.PI/2)
],
respondsToMouse: true,
scale: 1.5,
size: 3
}
}Optimization: If you inspect the models used in the examples you'll notice that a lot of data have been stripped out since we only really need the vertices here.
Attributes
| Property | Type | Description |
|---|---|---|
| type | Value must be ParticleSaga.ModelTarget |
The target class (must extend ParticleSaga.AbstractTarget) |
| url | String |
Path to the model json |
| options | PlainObject |
Options list to override default values described below |
Options
| Property | Type | Description |
|---|---|---|
| color | PlainObject containing r, g, and b properties with 0-1 values Ex/ {r: 0.5, g: 0.9, b: 1} |
Particle colors |
| initialMatrices | Array.<THREE.Matrix4> |
Initial transformations applied to the imported geometry. Default is [] |
| respondsToMouse | Boolean |
Whether or not to rotate the particle system along with the mouse position. Default is false |
| scale | Number |
Scales the intial geometry by this value. Default is 1.0 |
| size | Number |
Sets the size of the particles. Default is 1.0 |
MultiTargets can combine a list of other targets into a single geometry to display with the main scene's particles.
Example definition:
{
type: ParticleSaga.MultiTarget,
container: document.getElementById('multitarget-references'),
options: {
size: 3
},
targets: [
{
type: ParticleSaga.ModelTarget,
url: 'models/unicorn.json',
container: document.getElementById('unicorn-multitarget-reference'),
options: {
scale: 1.2,
color: {
r: 0.8,
g: 1,
b: 0.2
}
}
}, {
type: ParticleSaga.ImageTarget,
url: 'images/excellent.png',
container: document.getElementById('excellent-multitarget-reference')
}
]
}Optimization: If you inspect the models used in the examples you'll notice that a lot of data have been stripped out since we only really need the vertices here.
Attributes
| Property | Type | Description |
|---|---|---|
| type | Value must be ParticleSaga.MultiTarget |
The target class (must extend ParticleSaga.AbstractTarget) |
| container | Element |
Element to constrain position of target with. Default is the scene's context |
| options | PlainObject |
Options list to override default values described below |
| targets | Array |
List of targets mostly identical to those above, however some properties such as size will be inherited from the MultiTarget's options instead |
Options
| Property | Type | Description |
|---|---|---|
| color | PlainObject containing r, g, and b properties with 0-1 values Ex/ {r: 0.5, g: 0.9, b: 1} |
Default particle colors - will be overridden by any specified model target color in the nested targets array. |
| respondsToMouse | Boolean |
Whether or not to rotate the particle system along with the mouse position. Default is false |
| size | Number |
Sets the size of the particles. Default is 1.0 |
The scene is the top level object that you'll be interacting with after declaring your targets in order to control the gallery.
Attributes
| Property | Type | Description |
|---|---|---|
| context | Element |
The element to append canvas to and to derive max sizing from |
| targets | Array |
List of targets as defined above |
| options | PlainObject |
Options list to override default values described below |
Options
| Property | Type | Description |
|---|---|---|
| fov | Number |
Camera field of view degrees. Default is 45 |
| maxMouseRotation | Number |
Max radians the mouse position can rotate the particle system's about the y-axis by in either direction. Default is π/6 |
| mouseRotationFriction | Number |
Ratio of decay for how quickly the particle system will catch up to the mouse triggered rotation. Default is 0.2 |
| numFloatingParticles | Number |
Number of particles that will appear in a random position rather than attached to a target. Default is 40 |
| numParticles | Number |
Number of particles rendered on screen. Note that this does not have to match any other particle/vertex count - they will be evenly distributed or repeated as necessary. Default is 10000 |
| particleRevertDelay | Number |
Delay in milliseconds for each particle to begin morph. Default is 0.01 |
| revertDuration | Number |
Morph duration in milliseconds for each particle. Default is 800 |
| sizeAttenuation | Boolean |
Specify whether particles' size will get smaller with the distance. Default is true. |
| slideshowDuration | Number |
Duration in milliseconds between each slide if slideshow is enabled. Default is 5000 |
| sort | Function |
Javascript (a, b) sort method to be applied to each target's vertices initially. See VertexSort.coffee for some quick options. Default is null |
| Method | Params | Description |
|---|---|---|
| load | (optional) onAssetsLoad {Function} |
Triggers loading of all initial targets with optional callback |
| loadTarget | target {PlainObject}, onLoad {Function} |
Load an individual target with an optional callback. This can also be used to load targets beyond the initial ones |
| destroy | Halts all animation and attempts to dump all references (also calls relevant three.js dispose methods on scene children) | |
| setTarget | index {Integer} animated {Boolean} (default=true) |
Morph to the target you supplied at that index |
| nextTarget | animated {Boolean} (default=true) |
Morph to next target (wraps around) |
| prevTarget | animated {Boolean} (default=true) |
Morph to previous target (wraps around) |
| startSlideshow | Start interval going through each target | |
| stopSlideshow | Stops interval going through each target |
Requires Grunt and related dependencies (Node.js and npm).
After satisfying those requirements you can install the project-specific dependencies and build as follows:
$ cd path/to/particle-saga
$ npm install
$ grunt deploy
Special thanks to Eric Moncada, Jeff Yamada, Brijan Powell, and Impossible Bureau. This originally came about while working on our ever-upcoming website where we wanted to showcase our team using individual models that Eric made after scanning us all with a Kinect, and then the idea of intertwining these with images came through Brijan's designs.
3D models used in examples extracted from originals by izuzf (Helm) and simon_k (Gryphon)
Images used in examples come from Wikimedia Commons Olav den helliges saga, Pomerania coat of arms
