WhoAteDaCake

Hot reloading engine

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// @flow
// $FlowIgnore
import * as BABYLON from 'babylonjs';
import shortid from 'shortid';

type Color = {
  r: number,
  b: number,
  g: number,
};

export default class Scene {
  _scene: BABYLON.Scene;
  _camera: BABYLON.ArcRotateCamera;
  _light: BABYLON.HemisphericLight;

  constructor(engine: BABYLON.Engine, canvas: HTMLElement) {
    const scene = new BABYLON.Scene(engine);
    scene.clearColor = new BABYLON.Color4(0.5, 0.8, 0.6, 0.8);

    const camera = new BABYLON.ArcRotateCamera('Camera', 1.5 * Math.PI, Math.PI / 8, 50, BABYLON.Vector3.Zero(), scene);
    camera.setTarget(BABYLON.Vector3.Zero());
    camera.attachControl(canvas, false);

    const light = new BABYLON.HemisphericLight('light1', new BABYLON.Vector3(1, 1, 1), scene);
    light.intensity = 0.5;

    const sphereMaterial = new BABYLON.StandardMaterial('texture1', scene);
    sphereMaterial.alpha = 1;
    // sphereMaterial.diffuseColor = new BABYLON.Color3(0.5, 0.5, 0.5);
    sphereMaterial.diffuseColor = new BABYLON.Color3(0, 0, 0.5);

    const boxCfg = {
      size: 5,
      updatable: true,
    };

    const sphere = BABYLON.MeshBuilder.CreateBox('sphere1', boxCfg, scene);
    sphere.material = sphereMaterial;
    sphere.position.y = 5;

    this._scene = scene;
    this._camera = camera;
    this._light = light;
  }
  render = () => {
    this._scene.render();
  }
  dispose = () => {
    this._scene.dispose();
  }
}


import { Engine } from 'babylonjs';
import Scene from './Scene';

export default class RenderEngine {
  constructor(container) {
    this._container = container;
  }
  animate() {
    this._engine.runRenderLoop(this._scene.render);
    window.addEventListener('resize', this._engine.resize);
  }
  createScene() {
    this._scene = new Scene(this._engine, this._canvas);
  }
  render = () => {
    this._canvas = document.createElement('canvas');
    this._container.appendChild(this._canvas);
    this._engine = new Engine(this._canvas, false);
    this.createScene();
    this.animate();
  }
  reRender = () => {
    this._engine.dispose();
    this._container.removeChild(this._canvas);

    this.render();
  }
}


const root = document.getElementById('root');
const engine = new RenderEngine(root);
engine.render();

if (module.hot) {
  module.hot.accept('./RenderEngine', () => {
    engine.reRender();
  });
}

I am currently learning babylon.js and with my set up I have hot reloading, so when any files are changed, engine.reRender() will be called.

To test it out I change up color of sphereMaterial. It creates new canvas, but for some reason it still shows the old colors...

Is there any way to clear out the scene and engine to load the webgl with new configuration?

Thank you.

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Hey WATC... it sounds to me like it is (re-) loading the old Scene.js from the browser cache, instead of using the new/modified Scene.js from disk file.

https://stackoverflow.com/questions/118884/how-to-force-browser-to-reload-cached-css-js-files

Lots of talk about this issue... at that url.  Hope this helps.

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