Three js in a class
<p>I tried to set all the necessary functionality into one class in order to create a simple three.js scene with a cube. I don't get any errors, but the scene stays black when I open it in the browser.
Here is my code:</p>

<pre><code>class SceneInit {

    constructor(fov = 45,camera,scene,controls,renderer)
    {
        this.camera = camera;
        this.scene = scene;
        this.controls = controls;
        this.renderer = renderer;
        this.fov = fov;

    }



    initScene() {
        this.camera = new THREE.PerspectiveCamera(this.fov, window.innerWidth / window.innerHeight, 1, 1000);
        this.camera.position.z = 15;

        this.controls = new THREE.TrackballControls( this.camera );
        //this.controls.addEventListener('change', this.renderScene);

        this.scene = new THREE.Scene();

        //specify a canvas which is already created in the HTML file and tagged by an id        //aliasing enabled
        this.renderer = new THREE.WebGLRenderer({canvas: document.getElementById('myThreeJsCanvas') , antialias: true});
        this.renderer.setSize(window.innerWidth, window.innerHeight);
        document.body.appendChild(this.renderer.domElement);


        //ambient light which is for the whole scene
        let ambientLight = new THREE.AmbientLight(0xffffff, 0.7);
        ambientLight.castShadow = false;
        this.scene.add(ambientLight);

        //spot light which is illuminating the chart directly
        let spotLight = new THREE.SpotLight(0xffffff, 0.55);
        spotLight.castShadow = true;
        spotLight.position.set(0,40,10);
        this.scene.add(spotLight);


        //if window resizes
        window.addEventListener('resize', this.onWindowResize, false);
    }


    animate(){
        requestAnimationFrame( this.animate.bind(this) );
        this.render();
        this.controls.update();
    }


    render(){
        this.renderer.render( this.scene, this.camera );
    }


    onWindowResize() {
    this.camera.aspect = window.innerWidth / window.innerHeight;
    this.camera.updateProjectionMatrix();
    this.renderer.setSize( window.innerWidth, window.innerHeight );
}

}
</code></pre>

<p>And then I try to instantiate a new object and add an object to the scene. When I try to print the children of the scene, it returns me the right objects, but as I mentioned before the scene stays black. Only the renderer window is getting drawed in the browser.</p>

<pre><code>let test = new SceneInit(45);
test.initScene();
test.animate();


let geometry = new THREE.BoxBufferGeometry( 200, 200, 200 );
let material = new THREE.MeshBasicMaterial();
let mesh = new THREE.Mesh( geometry, material );

test.scene.add(mesh);
console.log(test.scene.children); //returns 3 objects (ambientLight, spotLight, mesh)
</code></pre>