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博主的案例並不難，只是爲了更好的給想入門threeJS的同學一點點經驗！！！！！
本章節學習的內容可以從的官方文檔中找到
涉及的知識點博主已經從three源碼庫裏面摘要出來放在對應的註釋裏面
今天學習Helper裏面的CameraHelper助手！
順便加入了鼠標控制相機的組件OrbitControls，不懂可以先忽略！
效果圖：
代碼：
<html>
<head>
<title>Helper04-CameraHelper</title>
<style>
body {
margin: 0;
}
canvas {
width: 100%;
height: 100%
}
</style>
</head>
<body>
<script src="../../../build/three.js"></script>
<script src="../../js/controls/OrbitControls.js"></script>
<script>
var camera, scene, renderer, geometry, material, animate, controls; //常用變量
var cube,helper; //自定義對象變量
init();
animate();
function init() {
scene = new THREE.Scene();
scene.background = new THREE.Color(0xcfcfcf);
camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.set(0, 0, 5);
//相機助手
helper = new THREE.CameraHelper(camera);
scene.add(helper);
renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
//OrbitControls控件操作模塊
controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.addEventListener('change', function () {
renderer.render(scene, camera);
});
geometry = new THREE.BoxGeometry(1, 1, 2); //寬，高，深
material = new THREE.MeshBasicMaterial({
color: 0x00ff00,
wireframe: false
}); //wireframe默認爲false
cube = new THREE.Mesh(geometry, material);
scene.add(cube);
}
function animate() {
requestAnimationFrame(animate);
controls.update();
cube.rotation.x += 0.01;
renderer.render(scene, camera);
};
</script>
</body>
</html>