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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GridHelper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>Helper07-GridHelper(網格助手)</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, light, helper; //自定義對象變量
var target = new THREE.Vector3(0, 0, 0);
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, 50, 150);
camera.lookAt(target);
camera.updateProjectionMatrix(); //相機更新
// DirectionalLight( color, intensity )
light = new THREE.DirectionalLight(0xFFFFFF, 2);
light.position.set(20, 20, 50);
//網格助手模塊
// GridHelper( size:網格的大小, divisions:跨網格的分割數, color1:中心線的顏色, color2:網格線條的顏色 )
var size = 120;
var divisions = 20;
var gridHelper = new THREE.GridHelper(size, divisions);
gridHelper.position.set(0,-20,0)
scene.add(gridHelper);
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);
});
// BoxGeometry( width, height, depth, widthSegments, heightSegments, depthSegments )
geometry = new THREE.BoxGeometry(30, 30, 30, 3, 3, 3);
material = new THREE.MeshBasicMaterial({
color: 0xcfffff,
wireframe: false
}); //wireframe默認爲false
cube = new THREE.Mesh(geometry, material);
// FaceNormalsHelper( object, size, hex, linewidth )
helper = new THREE.FaceNormalsHelper(cube, 10, 0x00ffcc, 1);
scene.add(cube, helper);
}
function animate() {
requestAnimationFrame(animate);
controls.update();
cube.rotation.x=cube.rotation.y+= 0.01;
if (helper) helper.update(); //判斷是否有法向助手，有則更新
renderer.render(scene, camera);
};
</script>
</body>
</html>