What could be the reason behind the malfunctioning of my three.js lighting system?

I am struggling to identify the issue with this code snippet (http://jsfiddle.net/resistdesign/s6npL/). Despite referencing the documentation and some examples, the lights don't seem to be functioning as expected.

var camera, scene, renderer, geometry, material, mesh, light1;

init();
animate();

function init() {

    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000);
    camera.position.z = 500;
    scene.add(camera);

    geometry = new THREE.CubeGeometry(200, 200, 200);
    material = new THREE.MeshPhongMaterial( { ambient: 0x555555, color: 0x555555, specular: 0xffffff, shininess: 50, shading: THREE.SmoothShading } );

    mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);

    scene.add( new THREE.AmbientLight( 0x000000 ) );

    light1 = new THREE.PointLight( 0xff0040, 2, 50 );
    scene.add( light1 );

    renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);

    document.body.appendChild(renderer.domElement);

}

function animate() {

    requestAnimationFrame(animate);
    render();

}

function render() {

    var time = Date.now() * 0.0005;

    mesh.rotation.x += 0.01;
    mesh.rotation.y += 0.02;

    light1.position.x = Math.sin( time * 0.7 ) * 30;
    light1.position.y = Math.cos( time * 0.5 ) * 40;
    light1.position.z = Math.cos( time * 0.3 ) * 30;

    renderer.render(scene, camera);

}

Answer №1

It appears as though there may have been a misunderstanding regarding the arguments of PointLight(). The third argument actually represents the distance at which the intensity of the light becomes zero. To correct this, you can add the following lines inside the init() function:

light1 = new THREE.PointLight( 0xff0040, 1, 5000 );
light1.position.set( 500, 500, 500 );

Furthermore, it is advisable to refrain from updating the light1.position within the render() routine until you are certain that the desired outcome is achieved.

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