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three.js如何提取鼠標點擊選中的模型

請問three.js如何提取鼠標點擊選中的模型？
代碼如下：

<!DOCTYPE html>

<html>

<head>
    <title>測試</title>
    <script type="text/javascript" src="../libs/three.js"></script>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>

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

<script type="text/javascript">

    function init() {

        var scene = new THREE.Scene();

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

        var renderer = new THREE.WebGLRenderer();

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

        var planeGeometry = new THREE.PlaneGeometry(60, 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 = 15;
        plane.position.y = 0;
        plane.position.z = 0;

        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.castShadow = true;

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

        scene.add(cube);

        var sphereGeometry = new THREE.SphereGeometry(4, 20, 20);
        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);

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

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

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

        renderer.render(scene, camera);


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

我想鼠標點擊選中球體或者正方體，并分別設(shè)置他們的透明度，謝謝！

回答

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