<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Mesh Normal Material</title>
<script src="../../three-part/threejs/three.js"></script>
<script src="../../three-part/utils/stats.min.js"></script>
<script src="../../three-part/utils/dat.gui.min.js"></script>
<script src="../controls/TrackballControls.js"></script>
<script src="../util/util.js"></script>
<style>
body {
margin: 0;
overflow: hidden;
}
</style>
</head>
<body>
<div id="container"></div>
<script type="text/javascript">
init();
function init() {
// show FPS
let stats = initStats();
// resize
window.addEventListener('resize', onResize, false);
let scene = new THREE.Scene();
let camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.x = -20;
camera.position.y = 50;
camera.position.z = 40;
camera.lookAt(new THREE.Vector3(10, 0, 0));
let renderer = new THREE.WebGLRenderer();
renderer.setClearColor(new THREE.Color(0x000000));
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
document.getElementById("container").appendChild(renderer.domElement);
// init trackball control
let trackballControls = initTrackballControls(camera, renderer);
let clock = new THREE.Clock();
let groundGeom = new THREE.PlaneGeometry(100, 100, 4, 4);
let groundMesh = new THREE.Mesh(groundGeom, new THREE.MeshBasicMaterial({
color: 0x777777
}));
groundMesh.rotation.x = -Math.PI / 2;
groundMesh.position.y = -20;
scene.add(groundMesh);
let sphereGeometry = new THREE.SphereGeometry(14, 20, 20);
// A material that maps the normal vectors to RGB colors.
let meshMaterial = new THREE.MeshNormalMaterial();
let sphere = new THREE.Mesh(sphereGeometry, meshMaterial);
sphere.position.x = 0;
sphere.position.y = 3;
sphere.position.z = 2;
scene.add(sphere);
// add ambient light
let ambientLight = new THREE.AmbientLight(0x0c0c0c);
scene.add(ambientLight);
// add spotlight
let spotLight = new THREE.SpotLight(0xffffff);
spotLight.position.set(-40, 60, -10);
spotLight.castShadow = true;
scene.add(spotLight);
for (let f = 0, fl = sphere.geometry.faces.length; f < fl; f++) {
let face = sphere.geometry.faces[f];
// calc center point of face
let centroid = new THREE.Vector3(0, 0, 0);
centroid.add(sphere.geometry.vertices[face.a]);
centroid.add(sphere.geometry.vertices[face.b]);
centroid.add(sphere.geometry.vertices[face.c]);
centroid.divideScalar(3);
/**
* ArrowHelper(dir : Vector3, origin : Vector3, length : Number, hex : Number, headLength : Number, headWidth : Number )
* dir -- direction from origin. Must be a unit vector.
* origin -- Point at which the arrow starts.
* length -- length of the arrow. Default is 1.
* hex -- hexadecimal value to define color. Default is 0xffff00.
* headLength -- The length of the head of the arrow. Default is 0.2 * length.
* headWidth -- The length of the width of the arrow. Default is 0.2 * headLength.
* @type {ArrowHelper}
*/
let arrow = new THREE.ArrowHelper(face.normal, centroid, 2, 0x3333FF, 0.5, 0.5);
sphere.add(arrow);
}
// attributes which can be modified in GUI
const controls = {
};
// init GUI
initGUI();
renderScene();
function initGUI(){
let gui = new dat.GUI();
}
function onResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function renderScene(){
trackballControls.update(clock.getDelta());
stats.update();
requestAnimationFrame(renderScene);
renderer.render(scene, camera);
}
}
</script>
</body>
</html>
运行结果：
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