misc_exporter_obj

对应 three.js 示例地址。

仅需关注 init 函数的内容，其他部分都是示例小程序所使用的描述配置。

example.jstypings.d.ts

import * as THREE from "three";
import { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
import { OBJExporter } from "three/examples/jsm/exporters/OBJExporter.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "misc_exporter_obj",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "webgl - exporter - obj"
      }
    ]
  ],
  init: ({
    window,
    canvas,
    GUI,
    Stats,
    needToDispose,
    useFrame,
    saveFile,
    requestLoading,
    cancelLoading
  }) => {
    let camera, scene, renderer;
    const params = {
      addTriangle,
      addCube,
      addCylinder,
      addMultiple,
      addTransformed,
      addPoints,
      exportToObj
    };
    init();
    function init() {
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 1e3);
      camera.position.set(0, 0, 400);
      scene = new THREE.Scene();
      const ambientLight = new THREE.AmbientLight(16777215);
      scene.add(ambientLight);
      const directionalLight = new THREE.DirectionalLight(16777215, 2.5);
      directionalLight.position.set(0, 1, 1);
      scene.add(directionalLight);
      const gui = new GUI();
      let h = gui.addFolder("Geometry Selection");
      h.add(params, "addTriangle").name("Triangle");
      h.add(params, "addCube").name("Cube");
      h.add(params, "addCylinder").name("Cylinder");
      h.add(params, "addMultiple").name("Multiple objects");
      h.add(params, "addTransformed").name("Transformed objects");
      h.add(params, "addPoints").name("Point Cloud");
      h = gui.addFolder("Export");
      h.add(params, "exportToObj").name("Export OBJ");
      gui.open();
      addGeometry(1);
      window.addEventListener("resize", onWindowResize);
      const controls = new OrbitControls(camera, renderer.domElement);
      controls.enablePan = false;
      needToDispose(renderer, scene, controls);
    }
    function exportToObj() {
      const exporter = new OBJExporter();
      const result = exporter.parse(scene);
      saveString(result, "object.obj");
    }
    function addGeometry(type) {
      for (let i = 0; i < scene.children.length; i++) {
        const child = scene.children[i];
        if (child.isMesh || child.isPoints) {
          child.geometry.dispose();
          scene.remove(child);
          i--;
        }
      }
      if (type === 1) {
        const material = new THREE.MeshLambertMaterial({ color: 52224 });
        const geometry = generateTriangleGeometry();
        scene.add(new THREE.Mesh(geometry, material));
      } else if (type === 2) {
        const material = new THREE.MeshLambertMaterial({ color: 52224 });
        const geometry = new THREE.BoxGeometry(100, 100, 100);
        scene.add(new THREE.Mesh(geometry, material));
      } else if (type === 3) {
        const material = new THREE.MeshLambertMaterial({ color: 52224 });
        const geometry = new THREE.CylinderGeometry(50, 50, 100, 30, 1);
        scene.add(new THREE.Mesh(geometry, material));
      } else if (type === 4 || type === 5) {
        const material = new THREE.MeshLambertMaterial({ color: 52224 });
        const geometry = generateTriangleGeometry();
        const mesh = new THREE.Mesh(geometry, material);
        mesh.position.x = -200;
        scene.add(mesh);
        const geometry2 = new THREE.BoxGeometry(100, 100, 100);
        const mesh2 = new THREE.Mesh(geometry2, material);
        scene.add(mesh2);
        const geometry3 = new THREE.CylinderGeometry(50, 50, 100, 30, 1);
        const mesh3 = new THREE.Mesh(geometry3, material);
        mesh3.position.x = 200;
        scene.add(mesh3);
        if (type === 5) {
          mesh.rotation.y = Math.PI / 4;
          mesh2.rotation.y = Math.PI / 4;
          mesh3.rotation.y = Math.PI / 4;
        }
      } else if (type === 6) {
        const points = [0, 0, 0, 100, 0, 0, 100, 100, 0, 0, 100, 0];
        const colors = [0.5, 0, 0, 0.5, 0, 0, 0, 0.5, 0, 0, 0.5, 0];
        const geometry = new THREE.BufferGeometry();
        geometry.setAttribute("position", new THREE.Float32BufferAttribute(points, 3));
        geometry.setAttribute("color", new THREE.Float32BufferAttribute(colors, 3));
        const material = new THREE.PointsMaterial({ size: 10, vertexColors: true });
        const pointCloud = new THREE.Points(geometry, material);
        pointCloud.name = "point cloud";
        scene.add(pointCloud);
      }
    }
    function addTriangle() {
      addGeometry(1);
    }
    function addCube() {
      addGeometry(2);
    }
    function addCylinder() {
      addGeometry(3);
    }
    function addMultiple() {
      addGeometry(4);
    }
    function addTransformed() {
      addGeometry(5);
    }
    function addPoints() {
      addGeometry(6);
    }
    async function saveString(data, filename) {
      try {
        await requestLoading("生成中");
        await saveFile(filename, data);
      } catch (e) {
      } finally {
        cancelLoading();
      }
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function animate() {
      renderer.render(scene, camera);
    }
    function generateTriangleGeometry() {
      const geometry = new THREE.BufferGeometry();
      const vertices = [];
      vertices.push(-50, -50, 0);
      vertices.push(50, -50, 0);
      vertices.push(50, 50, 0);
      geometry.setAttribute("position", new THREE.Float32BufferAttribute(vertices, 3));
      geometry.computeVertexNormals();
      return geometry;
    }
  }
};
export {
  exampleInfo as default
};

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import { Loader, TypedArray } from 'three';
/**
 * 官网示例的多端使用封装把版本
 * */
export interface OfficialExampleInfo extends MiniProgramMeta {
  /*** 示例名称（保持和官网一致）*/
  name: string;
  /** main */
  init: (context: LoadContext) => void;
}

export interface LoadContext {
  //为了减少官方代码的改动，实际上等同于 canvas
  window: EventTarget & { innerWidth: number; innerHeight: number; devicePixelRatio: number };
  /** HTMLCanvasElement */
  canvas: any;
  /** https://www.npmjs.com/package/lil-gui */
  GUI: any;
  /**
   * https://www.npmjs.com/package/stats.js
   * 也可以使用其他受支持的版本
   * */
  Stats: any;
  /** 收集需要 dispose 的对象（官方示例没有处理这部分）*/
  needToDispose: (...objs: any[]) => void | ((fromFn: () => any[]) => void);

  /**基于 raq 的通用封装 */
  useFrame(animateFunc: (/** ms */ delta: number) => void): { cancel: () => void };

  /** 显示加载模态框 */
  requestLoading(text?: string): Promise<void>;

  /** 隐藏加载模态框*/
  cancelLoading(): void;

  /** 保存文件的通用封装*/
  saveFile(
    fileName: string,
    data: ArrayBuffer | TypedArray | DataView | string
  ): Promise<string | null>;

  /** 示例使用 DracoDecoder 时的资源路径 */
  DecoderPath: {
    GLTF: string;
    STANDARD: string;
  };

  /** 为资源路径拼上 CDN 前缀 */
  withCDNPrefix(path: string): string;

  /**
   * 在小程序中应使用 import { VideoTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/VideoTexture.js';
   * 正常情况（web） 可直接使用 THREE.VideoTexture
   * */
  getVideoTexture(videoOptions: VideoOptions): Promise<[{ isVideoTexture: true }, video: any]>;

  /**
   * 在小程序中应使用 import { CameraTexture } from '@minisheep/three-platform-adapter/override/jsm/textures/CameraTexture.js';
   * 正常情况（web） 可参考示例 webgl_materials_video_webcam
   * */
  getCameraTexture(): { isVideoTexture: true };

  /** 用于动态修改 info 中的占位符*/
  bindInfoText(template: `$${string}$`, initValue?: string): { value: string };

  /** 分屏控件对应的事件回调 */
  onSlideStart(handle: () => void): void;
  /** 分屏控件对应的事件回调 */
  onSlideEnd(handle: () => void): void;
  /** 分屏控件对应的事件回调 */
  onSlideChange(handle: (offset: number, boxSize: number) => void): void;
}

export type VideoOptions = {
  src: string;
  /** 相当于 HTMLVideoElement 的 naturalWidth (小程序中获取不到)*/
  width: number;
  /** 相当于 HTMLVideoElement 的 naturalHeight (小程序中获取不到)*/
  height: number;
  loop?: boolean;
  autoplay?: boolean;
  muted?: boolean;
};

/** 示例小程序中使用的一些配置 */
export interface MiniProgramMeta {
  /** 用于统计加载相关信息 */
  useLoaders: Loader[];
  /** 通用 info */
  info: TagItem[][];
  /** 特殊 info */
  infoPanel?: {
    left?: [string, string][];
    right?: [string, string][];
  };
  /** 分屏控件配置 */
  needSlider?: {
    /** 方向 */
    direction?: 'horizontal' | 'vertical';
    /** 初始偏移 0-100 */
    initPosition?: number;
  };
  /** 操作摇杆控件 */
  needArrowControls?: boolean;
  /** 默认需要的画布类型 */
  canvasType?: '2d' | 'webgl' | 'webgl2';
  /** 为保持效果一致所需要的画布样式 */
  canvasStyle?: {
    bgColor?: string;
    width?: number | string;
    height?: number | string;
  };
  /** 部分示例需要在加载前进行一些提示 */
  initAfterConfirm?: {
    /**
     * 提示类型
     * @default 'default'
     * */
    type?: 'warning' | 'default';
    text: string[];
  };
}

export interface BaseTag<T extends string> {
  tag: T;
  content: string;
}

export interface ATag extends BaseTag<'a'> {
  link: string;
}

export type TextTag = BaseTag<'text'>;

export type TagItem = TextTag | ATag;

misc_exporter_obj ​

misc_exporter_obj