chapter-04/02-depth-material.html

<!DOCTYPE html>

<html>

<head>
    <title>Example 04.02 - Depth Material</title>
    <script type="text/javascript" src="../libs/three.js"></script>

    <script type="text/javascript" src="../libs/stats.js"></script>
    <script type="text/javascript" src="../libs/dat.gui.js"></script>
    <style>
        body {
            /* set margin to 0 and overflow to hidden, to go fullscreen */
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>

<div id="Stats-output">
</div>
<!-- Div which will hold the Output -->
<div id="WebGL-output">
</div>

<!-- Javascript code that runs our Three.js examples -->
<script type="text/javascript">

    // once everything is loaded, we run our Three.js stuff.
    function init() {

        var stats = initStats();

        // create a scene, that will hold all our elements such as objects, cameras and lights.
        var scene = new THREE.Scene();
        scene.overrideMaterial = new THREE.MeshDepthMaterial();

        // create a camera, which defines where we're looking at.
        var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 10, 130);

        // create a render and set the size
        var renderer = new THREE.WebGLRenderer();

        renderer.setClearColor(new THREE.Color(0x00000, 1.0));
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.shadowMapEnabled = true;

        // position and point the camera to the center of the scene
        camera.position.x = -50;
        camera.position.y = 40;
        camera.position.z = 50;
        camera.lookAt(scene.position);

        // add the output of the renderer to the html element
        document.getElementById("WebGL-output").appendChild(renderer.domElement);

        // call the render function
        var step = 0;

        var controls = new function () {
            this.cameraNear = camera.near;
            this.cameraFar = camera.far;
            this.rotationSpeed = 0.02;
            this.numberOfObjects = scene.children.length;

            this.removeCube = function () {
                var allChildren = scene.children;
                var lastObject = allChildren[allChildren.length - 1];
                if (lastObject instanceof THREE.Mesh) {
                    scene.remove(lastObject);
                    this.numberOfObjects = scene.children.length;
                }
            };

            this.addCube = function () {

                var cubeSize = Math.ceil(3 + (Math.random() * 3));
                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;

                // position the cube randomly in the scene
                cube.position.x = -60 + Math.round((Math.random() * 100));
                cube.position.y = Math.round((Math.random() * 10));
                cube.position.z = -100 + Math.round((Math.random() * 150));

                // add the cube to the scene
                scene.add(cube);
                this.numberOfObjects = scene.children.length;
            };

            this.outputObjects = function () {
                console.log(scene.children);
            }
        };

        var gui = new dat.GUI();
        gui.add(controls, 'rotationSpeed', 0, 0.5);
        gui.add(controls, 'addCube');
        gui.add(controls, 'removeCube');
        gui.add(controls, 'cameraNear', 0, 50).onChange(function (e) {
            camera.near = e;
        });
        gui.add(controls, 'cameraFar', 50, 200).onChange(function (e) {
            camera.far = e;
        });

        var i = 0;
        while (i < 10) {
            controls.addCube();
            i++;
        }


        render();

        function render() {
            stats.update();

            // rotate the cubes around its axes
            scene.traverse(function (e) {
                if (e instanceof THREE.Mesh) {

                    e.rotation.x += controls.rotationSpeed;
                    e.rotation.y += controls.rotationSpeed;
                    e.rotation.z += controls.rotationSpeed;
                }
            });

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

        function initStats() {

            var stats = new Stats();

            stats.setMode(0); // 0: fps, 1: ms

            // Align top-left
            stats.domElement.style.position = 'absolute';
            stats.domElement.style.left = '0px';
            stats.domElement.style.top = '0px';

            document.getElementById("Stats-output").appendChild(stats.domElement);

            return stats;
        }
    }
    window.onload = init;
</script>
</body>
</html>