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跟场景相关的函数:
Scene.add() : 在场景中添加物体。
Scene.remove():从场景中移除物体。
Scene.children():获取场景中所有子对象的列表。
Scene.getChildByName():利用name属性,从场景中获取某个指定的物体。
Scene.traverse():我们可以将一个函数传递给traverse()函数,这个传递过来的函数将会在场景的每一个子对象上调用一次。
<!DOCTYPE html> <!-- 场景 --> <html> <head> <title>Example 02.01 - Basic Scene</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(); // create a camera, which defines where we're looking at. var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000); scene.add(camera); // create a render and set the size var renderer = new THREE.WebGLRenderer(); renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0)); renderer.setSize(window.innerWidth, window.innerHeight); renderer.shadowMapEnabled = true; // create the ground plane var planeGeometry = new THREE.PlaneGeometry(60, 40, 1, 1); var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffffff}); var plane = new THREE.Mesh(planeGeometry, planeMaterial); plane.receiveShadow = true; // rotate and position the plane plane.rotation.x = -0.5 * Math.PI; plane.position.x = 0; plane.position.y = 0; plane.position.z = 0; // add the plane to the scene scene.add(plane); // position and point the camera to the center of the scene camera.position.x = -30; camera.position.y = 40; camera.position.z = 30; camera.lookAt(scene.position); // add subtle ambient lighting // 环境光 var ambientLight = new THREE.AmbientLight(0x0c0c0c); scene.add(ambientLight); // add spotlight for the shadows var spotLight = new THREE.SpotLight(0xffffff); spotLight.position.set(-40, 60, -10); spotLight.castShadow = true; // 聚光灯光源 scene.add(spotLight); // 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.rotationSpeed = 0.02; this.numberOfObjects = scene.children.length; // 把最后添加的方块从场景中移除 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; } }; // 随机在场景中添加一个方块 this.addCube = function () { var cubeSize = Math.ceil((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; cube.name = "cube-" + scene.children.length; // position the cube randomly in the scene cube.position.x = -30 + Math.round((Math.random() * planeGeometry.parameters.width)); cube.position.y = Math.round((Math.random() * 5)); cube.position.z = -20 + Math.round((Math.random() * planeGeometry.parameters.height)); // 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, 'outputObjects'); gui.add(controls, 'numberOfObjects').listen(); render(); function render() { stats.update(); // rotate the cubes around its axes /** * 我们可以将一个函数传递给traverse()函数,这个传递过来的函数将会在场景的每一个子对象上调用一次。 * 在render()函数里,将使用traverse()函数更新每个方块的旋转弧度(特意忽略了地面的plane对象。) * 当然也可以通过for循环遍历children这个属性数组来达到同样的目的。 */ scene.traverse(function (e) { if (e instanceof THREE.Mesh && e != plane) { 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>
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