Add changing sunlight?

[helxsz]

@Maurizzzio I am now experimenting to add a changing sunlight to the city scene, so it means when it is enabled, the changing sunlight would dynamically change the shadow of the tree and building and car.

so instead of using createSceneLights() in the Application.js, I have added this function to the World.js. and more than that,

    World.lightChangingEnabled = true;
    changeSunLight:function(){
        var light = T3.ObjectManager.get('directional-light-3');
        var angle   = Date.now()/1000 * Math.PI;
        // angle    = Math.PI*2
        light.position.x    = Math.cos(angle*-0.1)*20;
        light.position.y    = 10 + Math.sin(angle*0.5)*6;
        light.position.z    = Math.sin(angle*-0.1)*20; 
    },

    render: function () {
        if(World.lightChangingEnabled)  this.changeSunLight();
        World.renderer.render(scene, T3.World.activeCamera.real);
    }

so far, now it enables the random sunlight, what I am going to do is to simulate the changing sunlight as a sunlight in the day from sunrise to sun down, it is important to make sure the directional light 's position. I am trying to figure out, if you have any further ideas to simulate it