03-start.html


<!DOCTYPE html>
<html>
<head>
    <title>three.js webgl - Start</title>
    <meta charset="utf-8">
    <script src="../frameworks/three.min.js"></script>
    <script src="../frameworks/dat.gui.min.js"></script>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
    <script>

    var renderer;
    var scene;
    var camera;
    var clock;
    var control;

    function init() {

        scene = new THREE.Scene();

        camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);

        renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(0x000000, 1.0);
        renderer.physicallyCorrectLights = true;
        renderer.gammaInput = true;
        renderer.gammaOutput = true;
        renderer.shadowMap.enabled = true;
        renderer.toneMapping = THREE.ReinhardToneMapping;
        renderer.setPixelRatio( window.devicePixelRatio );
        renderer.setSize( window.innerWidth, window.innerHeight );

        var planeGeometry = new THREE.PlaneGeometry(20, 20);
        var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffffff});
        var plane = new THREE.Mesh(planeGeometry, planeMaterial);
        plane.receiveShadow = true;
        plane.rotation.x = -0.5 * Math.PI;
        plane.position.x = 0;
        plane.position.y = -2;
        plane.position.z = 0;

        scene.add(plane);

        
        var startShape = new THREE.Shape([
            new THREE.Vector2(0,3),
            new THREE.Vector2(1,1),
            new THREE.Vector2(3,0),
            new THREE.Vector2(1,-1),
            new THREE.Vector2(0,-3),
            new THREE.Vector2(-1,-1),
            new THREE.Vector2(-3,0),
            new THREE.Vector2(-1,1)
        ]);
        var startGeometry = new THREE.ShapeGeometry( startShape );
        var startMaterial = new THREE.MeshLambertMaterial({color: 0x827a06, transparent:true, opacity:1, side: THREE.DoubleSide });
        var start = new THREE.Mesh(startGeometry, startMaterial);
        start.name='start';
        start.position.set(0,1,0);
        start.castShadow = true;

        scene.add(start);

        camera.position.x = 15;
        camera.position.y = 16;
        camera.position.z = 13;
        camera.lookAt(scene.position);


        var ambient = new THREE.AmbientLight(0xffffff,0.3);
        scene.add(ambient);
        var light = new THREE.DirectionalLight(0xffffff, 1, 100, 2 );
        light.position.set(10, 20 , 20); 
        light.castShadow = true;
        scene.add(light);

        control = new function() {
            this.rotationSpeed = 0.5;
            this.opacity = 1;
            this.color = 0x827a06;
        };
        addControlGui(control);

        clock = new THREE.Clock();
        document.body.appendChild(renderer.domElement);

        render();
    }

    function addControlGui(controlObject) {
        var gui = new dat.GUI();
        gui.add(controlObject, 'rotationSpeed', -1, 1);
        gui.add(controlObject, 'opacity', 0.1, 1);
        gui.addColor(controlObject, 'color');
    }


    function render() {

        var delta =  clock.getDelta();
        var rotSpeed = delta*control.rotationSpeed;
        camera.position.x = camera.position.x * Math.cos(rotSpeed) + camera.position.z * Math.sin(rotSpeed);
        camera.position.z = camera.position.z * Math.cos(rotSpeed) - camera.position.x * Math.sin(rotSpeed);
        camera.lookAt(scene.position);

        scene.getObjectByName('start').material.opacity = control.opacity;
        scene.getObjectByName('start').material.color = new THREE.Color(control.color);

        requestAnimationFrame(render);
        renderer.render(scene, camera);
    }


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

    window.addEventListener("DOMContentLoaded", function(event) {
            init();
    });
    window.addEventListener('resize', handleResize, false);

    </script>
</head>
<body>
</body>
</html>