@nkduy/scenejs

SceneJS

Particle effect renderer based on three.js and the Minecraft Bedrock particle format.

Installation

npm i scenejs

Usage

This is the simplest possible implementation of a SceneJS emitter into your scene

// Import scenejs
import SceneJS from "scenejs";
// Load JSON File
import RainbowParticle from "./rainbow.particle.json";

// Setup SceneJS Scene
const scenejs_scene = new SceneJS.Scene();
// Setup Emitter
const emitter = new SceneJS.Emitter(scenejs_scene, RainbowParticle);
// Add emitter into Three.JS scene
threejs_scene.add(scenejs_scene.space);
// Play Effect
emitter.playLoop();

// Update particle rotation in your app's rendering loop
scenejs_scene.updateFacingRotation(camera);

Development

• npm i: Install dependencies
• npm run watch: Activate compiler
• npm run build: Build for production

API

Scene

new SceneJS.Scene(options?)

Creates a new scene, which can hold multiple emitters

• options: Object:
  • fetchTexture: Function

Properties

• emitters: Array List of all emitters
• space: three.js Object3D Global particle space. Add this to your three.js scene.
• global_options: Object
  • max_emitter_particles: Number Maximum amount of particles per emitter
  • tick_rate: Number Emitter tick rate per second.
  • loop_mode: String Default emitter loop mode
  • parent_mode: String Default emitter parent mode
  • scale: Number Emitter scale. The default is 1 for block space. Set to 16 to run in a pixel space environment like Pixel Studio.

SceneJSScene#updateFacingRotation(camera)

Updates the particle facing rotation for all emitters

• camera: Camera three.js camera to orient the particle towards

SceneJSScene#fetchTexture( config )

Method to provide visuals for a texture. Null by default. Gets called by configs if the texture is updated. Should return a data URL, or a promise resulting in a data URL.

• config: Config Particle config that is requesting the texture

 

Emitter

new SceneJS.Emitter(scene, config?, options?)

Creates a new particle emitter

• scene: SceneJS Scene: SceneJS scene to add this emitter to
• config: Config: Config instance
• scene: Scene: SceneJS Scene
• options: Object:
  • loop_mode: String How the emitter loops: auto, once or looping. Default: auto
  • loop_mode: String How the emitter is located in the world: world, entity or locator. Default: world

Emitter#updateFacingRotation(camera)

Updates the particle facing rotation

• camera: Camera three.js camera to orient the particle towards

Emitter#delete()

Deletes the emitter

 

Default Playback Loop

Emitter#playLoop()

Starts to play the particle effect using the default play loop

Emitter#toggleLoop()

Pause/resume the default playback loop

Emitter#stopLoop()

Stops the default playback loop

 

Control Emitter

Emitter#start()

Starts the emitter, setting the time to 0 and initializing all variables

Emitter#tick()

Runs an emitter tick

Emitter#stop(clear_particles)

Stops the emitter

Emitter#jumpTo(second)

Jumps to a specific time in the emitter. This is optimited to run as few operations as possible so you can use it to hook the emitter to a custom playback loop

 

Config

Configs store the configuration of an emitter. All emitters have a config by default.

new SceneJS.Config(scene, config, options)

Creates a new emitter config instance

• scene: SceneJS Scene: SceneJS scene
• config: Config: Config instance
• options: Object:
  • path: String Location of the particle file that the config is based on.

Config#reset()

Resets the config to default values

Config#set(key, value)

Sets a property of the config to a specific value

• key: String Key of the value to change
• value: Any Value to set

Config#setFromJSON(data)

Loads the configuration from a JSON particle file

• json: Object Particle file content

Config#onTextureUpdate()

Method that runs when the texture of the config is updated. Null by default