learningThreeJS/c02_01-fog.html at master · sqlcn/learningThreeJS · GitHub

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<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>chapter02 02-fog</title>
    <script src="libs/three.js"></script>
    <script src="libs/stats.js"></script>
    <script src="libs/dat.gui.js"></script>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>

<body>
    <div id="WebGL-output"></div>
    <div id="Stats-output"></div>

    <script>
        function initStats() {
            var stats = new Stats();
            stats.setMode(0);
            stats.domElement.style.position = 'absolute';
            stats.domElement.style.left = '0px';
            stats.domElement.style.top = '0px';
            document.getElementById("Stats-output").appendChild(stats.domElement);
            return stats;
        }

        var scene;
        var camera;
        var renderer;

        function init() {
            var stats = initStats();

            // var controls = {
            //     rotationSpeed: 0.02,
            //     bouncingSpeed: 0.03
            // }

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

            renderer = new THREE.WebGLRenderer();
            renderer.setClearColor(0xEEEEEE);
            renderer.setSize(window.innerWidth, window.innerHeight);
            renderer.shadowMapEnabled = true;

            var axes = new THREE.AxesHelper(10);
            scene.add(axes);

            var planeGeometry = new THREE.PlaneGeometry(60, 20, 1, 1);
            var planeMaterial = new THREE.MeshLambertMaterial({ color: 0xcccccc });
            var plane = new THREE.Mesh(planeGeometry, planeMaterial);

            plane.rotation.x = -0.5 * Math.PI;
            plane.position.x = 15;
            plane.position.y = 0;
            plane.position.z = 0;
            plane.receiveShadow = true;

            scene.add(plane);

            var cubeGeometry = new THREE.BoxGeometry(4, 4, 4);
            var cubeMaterial = new THREE.MeshLambertMaterial({ color: 0xff0000 });
            var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);

            cube.position.x = -4;
            cube.position.y = 3;
            cube.position.z = 0;
            cube.castShadow = true;

            scene.add(cube);

            var sphereGeometry = new THREE.SphereGeometry(4, 16, 16)
            var sphereMaterial = new THREE.MeshLambertMaterial({ color: 0x7777ff });
            var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);

            sphere.position.x = 20;
            sphere.position.y = 4;
            sphere.position.z = 2;
            sphere.castShadow = true;

            scene.add(sphere);

            var spotLight = new THREE.SpotLight(0xffffff);
            spotLight.position.set(-40, 60, -10);
            spotLight.castShadow = true

            scene.add(spotLight);

            camera.position.x = -30;
            camera.position.y = 40;
            camera.position.z = 30
            camera.lookAt(scene.position);

            scene.fog = new THREE.Fog(0xffffff, 0.01, 200);
            // scene.fog = new THREE.FogExp2(0xffffff, 0.02);

            document.getElementById("WebGL-output").appendChild(renderer.domElement);

            var controls = new function () {
                this.rotationSpeed = 0.02;
                this.bouncingSpeed = 0.03;
                this.numberOfObjects = scene.children.length;
                this.addCube = function () {
                    var cubeSize = Math.ceil(3 * Math.random());
                    var cubeGeometry = new THREE.BoxGeometry(cubeSize, cubeSize, cubeSize);
                    var cubeMaterial = new THREE.MeshLambertMaterial({ color: Math.random() * 0xffffff });
                    var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
                    cube.castShadow = true;
                    cube.name = "cube-" + scene.children.length;
                    cube.position.x = -15 + Math.round(Math.random() * 60);
                    cube.position.y = Math.round(5 * Math.random());
                    cube.position.z = -10 + Math.round(Math.random() * 20);
                    scene.add(cube);
                    this.numberOfObjects = scene.children.length;
                }
            }

            var gui = new dat.GUI();
            gui.add(controls, 'rotationSpeed', 0, 0.5);
            gui.add(controls, 'bouncingSpeed', 0, 0.5);
            gui.add(controls, 'addCube');
            gui.add(controls, 'numberOfObjects').listen();

            var step = 0;
            function renderScene() {
                stats.update();
                requestAnimationFrame(renderScene);
                renderer.render(scene, camera);

                scene.traverse(function (obj) {
                    if (obj instanceof THREE.Mesh && obj != plane) {
                        obj.rotation.x += controls.rotationSpeed;
                        obj.rotation.y += controls.rotationSpeed;
                        obj.rotation.z += controls.rotationSpeed;
                    }
                });

                step += controls.bouncingSpeed;
                sphere.position.x = 20 + (10 * (Math.cos(step)));
                sphere.position.y = 2 + (10 * Math.abs(Math.sin(step)));

            }
            renderScene();
        };

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

        window.addEventListener('resize', onResize, false);
        window.onload = init;

    </script>
</body>

</html>