Phenomenon is a very small, low-level WebGL library that provides the essentials to deliver a high performance experience. Its core functionality is built around the idea of moving millions of particles around using the power of the GPU.
- Small in size, no dependencies
- GPU based for high performance
- Low-level & highly configurable
- Helper functions with options
- Add & destroy instances dynamically
- Dynamic attribute switching
Want to see some magic right away? Have a look here!
$ npm install --save phenomenon
// Import the library import Phenomenon from 'phenomenon'; // Create a renderer const phenomenon = new Phenomenon(options); // Add an instance phenomenon.add("particles", options);
For a better understanding of how to use the library, read along or have a look at the demo!
Returns an instance of Phenomenon.
Throughout this documentation we'll refer to an instance of this as
The element where the scene, with all of its instances, will be rendered to. The provided element has to be
<canvas> otherwise it won't work.
Overrides that are used when getting the WebGL context from the canvas. The library overrides two settings by default.
||Setting this property to
||Setting this property to
Read more about all the possible overrides on MDN.
The context identifier defining the drawing context associated to the canvas. For WebGL 2.0 use
Overrides that can be used to alter the behaviour of the experience.
||The resolution multiplier by which the scene is rendered relative to the canvas' resolution. Use
||The color in
||The distance in 3D space between the center of the scene and the camera.|
||A boolean indicating whether the scene should start rendering automatically.|
||Shared values between all instances that can be updated at any given moment. By default this feature is used to render all the instances with the same
||A setup hook that is called before first render which can be used for gl context changes.|
||A render hook that is invoked after every rendered frame. Use this to update
Update all values that are based on the dimensions of the canvas to make it look good on all screen sizes.
Toggle the rendering state of the scene. When shouldRender is false
requestAnimationFrame is disabled so no resources are used.
An optional boolean to set the rendering state to a specific value. Leaving this value empty will result in a regular boolean switch.
This function is used to add instances to the renderer. These instances can be as simple or complex as you'd like them to be. There's no limit to how many of these you can add. Make sure they all have a different key!
Every instance should have a unique name. This name can also be used to destroy the instance specifically later.
An object containing overrides for parameters that are used when getting the WebGL context from the canvas.
||Values used in the program that are stored once, directly on the GPU.|
||Values used in the program that can be updated on the fly.|
||-||The vertex shader is used to position the geometry in 3D space.|
||-||The fragment shader is used to provide the geometry with color or texture.|
||The amount of duplicates that will be created for the same instance.|
||The way the instance will be rendered. Particles = 0, triangles = 4.|
||Vertices (and optional normals) of a model.|
||Modifiers to alter the attributes data on initialize.|
||A render hook that is invoked after every rendered frame.|
Note: Less instances with a higher multiplier will be faster than more instances with a lower multiplier!
Remove an instance from the scene (and from memory) by its key.
Remove all instances and the renderer itself. The canvas element will remain in the DOM.
Dynamically override an attribute with the same logic that is used during initial creation of the instance. The function requires an object with a name, size and data attribute.
Note: The calculation of the data function is done on the CPU. Be sure to check for dropped frames with a lot of particles.
Attributes can also be switched. In the demo this is used to continue with a new start position identical to the end position. This can be achieved with
.prepareBuffer(attribute) in which the data function is replaced with the final array.
Are you excited about this library and have interesting ideas on how to improve it? Please tell me or contribute directly!
npm install > npm start > http://localhost:8080
MIT © Colin van Eenige