Three.js - 从本地存储中保存和加载 json 格式的模型
json格式的模型，是three.js所独有的格式
示例：https://ithanmang.gitee.io/threejs/home/201808/20180827/01-save%20and%20load%20json%20file.html
把模型保存成json对象非常同意，只需要.toJSON()即可，然后在通过JSON.stringify()方法将json对象转换成json字符串，然后通过localStorge.setItem()方法将json字符串保存在本地存储中。
主要代码
// 保存
this.save = function () {
localStorage.setItem('cylinder', JSON.stringify(cylinder.toJSON()));
};
// 加载
this.load = function () {
let cylinderJson = localStorage.getItem('cylinder');
if (cylinderJson) {
scene.remove(loadedMesh);
// 将 cylinderJson 字符串转换为 json 对象
let loadedGeometry = JSON.parse(cylinderJson);
console.log(loadedGeometry);
// 解析 json 对象
let loader = new THREE.ObjectLoader();
loadedMesh = loader.parse(loadedGeometry);
loadedMesh.position.x = -10;
console.log(loadedMesh);
scene.add(loadedMesh);
// 加载完之后清除本地存储
localStorage.clear();
}
};
①点击保存之后看下本地存储
此时的字符串，已经保存在了本地，当然，你也可以以文件的形式保存。
②读取本地存储的数据
// 将 cylinderJson 字符串转换为 json 对象
let loadedGeometry = JSON.parse(cylinderJson);
console.log(loadedGeometry);
示例代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>保存和加载模型</title>
<style>
body {
margin: 0;
overflow: hidden; /* 溢出隐藏 */
}
</style>
<script src="../../libs/build/three-r93.js"></script>
<script src="../../libs/examples/js/Detector.js"></script>
<script src="../../libs/examples/js/libs/dat.gui.min.js"></script>
<script src="../../libs/examples/js/libs/stats.min.js"></script>
<script src="../../libs/examples/js/controls/OrbitControls.js"></script>
</head>
<body>
<script>
let scene, camera, renderer, controls, guiControls, cylinder;
let stats = initStats();
/* 场景 */
function initScene() {
scene = new THREE.Scene();
}
/* 相机 */
function initCamera() {
camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 10000);
camera.position.set(5, 5, 20);
camera.lookAt(new THREE.Vector3(0, 0, 0));
}
/* 渲染器 */
function initRender() {
renderer = new THREE.WebGLRenderer({antialias: true});
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
}
/* 灯光 */
function initLight() {
}
/* 控制器 */
function initControls() {
controls = new THREE.OrbitControls(camera, renderer.domElement);
/* 属性参数默认 */
}
/* 调试插件 */
let loadedMesh;
function initGui() {
guiControls = new function () {
this.radiusTop = cylinder.geometry.parameters.radiusTop;
this.radiusBottom = cylinder.geometry.parameters.radiusBottom;
this.height = cylinder.geometry.parameters.height;
this.radialSegments = cylinder.geometry.parameters.radialSegments;
this.redraw = function () {
/* 移除模型重新绘制 */
scene.remove(cylinder);
cylinder = createMesh(new THREE.CylinderGeometry(
guiControls.radiusTop,
guiControls.radiusBottom,
guiControls.height,
guiControls.radialSegments));
scene.add(cylinder);
};
this.save = function () {
localStorage.setItem('cylinder', JSON.stringify(cylinder.toJSON()));
};
this.load = function () {
let cylinderJson = localStorage.getItem('cylinder');
if (cylinderJson) {
scene.remove(loadedMesh);
// 将 cylinderJson 字符串转换为 json 对象
let loadedGeometry = JSON.parse(cylinderJson);
console.log(loadedGeometry);
// 解析 json 对象
let loader = new THREE.ObjectLoader();
loadedMesh = loader.parse(loadedGeometry);
loadedMesh.position.x = -10;
console.log(loadedMesh);
scene.add(loadedMesh);
// 加载完之后清除本地存储
localStorage.clear();
}
};
};
let controls = new dat.GUI({width: 300});
controls.add(guiControls, 'radiusTop', 1, 5).onChange(guiControls.redraw);
controls.add(guiControls, 'radiusBottom', 1, 5).onChange(guiControls.redraw);
controls.add(guiControls, 'height', 1, 10).onChange(guiControls.redraw);
controls.add(guiControls, 'radialSegments', 3, 20).onChange(guiControls.redraw);
controls.add(guiControls, 'save');
controls.add(guiControls, 'load');
}
/* 场景中的内容 */
function initContent() {
let cylinderGeometry = new THREE.CylinderGeometry(2, 2, 5, 3);
cylinder = new createMesh(cylinderGeometry);
cylinder.name = '测试';
// let json = cylinder.toJSON();
// let jsonString = JSON.stringify(json);
//
// alert(jsonString);
scene.add(cylinder);
}
/* 创建网格 */
function createMesh(geometry) {
let material = new THREE.MeshNormalMaterial();
let mesh = new THREE.Mesh(geometry, material);
return mesh;
}
/* 性能插件 */
function initStats() {
let stats = new Stats();
document.body.appendChild(stats.domElement);
return stats;
}
/* 窗口变动触发 */
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
/* 数据更新 */
function update() {
stats.update();
}
/* 初始化 */
function init() {
initScene();
initCamera();
initRender();
initLight();
initControls();
initContent();
initGui();
/* 监听事件 */
window.addEventListener('resize', onWindowResize, false);
}
/* 循环渲染 */
function animate() {
requestAnimationFrame(animate);
renderer.render(scene, camera);
update();
}
/* 初始加载 */
(function () {
console.log("three init start...");
init();
animate();
console.log("three init send...");
})();
</script>
</body>
</html>