misc_exporter_gltf

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.js

import * as THREE from "three";
import { GLTFExporter } from "three/examples/jsm/exporters/GLTFExporter.js";
import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";
import { KTX2Loader } from "three/examples/jsm/loaders/KTX2Loader.js";
import { MeshoptDecoder } from "three/examples/jsm/libs/meshopt_decoder.module.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "misc_exporter_gltf",
  useLoaders: [GLTFLoader, KTX2Loader],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "webgl - exporter - gltf"
      }
    ]
  ],
  init: ({
    window,
    canvas,
    GUI,
    Stats,
    needToDispose,
    useFrame,
    saveFile,
    requestLoading,
    cancelLoading
  }) => {
    function exportGLTF(input) {
      const gltfExporter = new GLTFExporter();
      const options = {
        trs: params.trs,
        onlyVisible: params.onlyVisible,
        binary: params.binary,
        maxTextureSize: params.maxTextureSize
      };
      requestLoading({
        title: "生成中",
        mask: true
      });
      gltfExporter.parse(
        input,
        async function(result) {
          cancelLoading();
          const prefix = Math.floor(Date.now() / 1e3);
          if (result instanceof ArrayBuffer) {
            await saveFile(prefix + "scene.glb", result);
          } else {
            const output = JSON.stringify(result);
            await saveFile(prefix + "scene.gltf", output);
          }
        },
        function(error) {
          console.log("An error happened during parsing", error);
        },
        options
      );
    }
    let camera, object, object2, material, geometry, scene1, scene2, renderer;
    let gridHelper, sphere, model, coffeemat;
    const params = {
      trs: false,
      onlyVisible: true,
      binary: false,
      maxTextureSize: 4096,
      exportScene1,
      exportScenes,
      exportSphere,
      exportModel,
      exportObjects,
      exportSceneObject,
      exportCompressedObject
    };
    init();
    function init() {
      const data = new Uint8ClampedArray(100 * 100 * 4);
      for (let y = 0; y < 100; y++) {
        for (let x = 0; x < 100; x++) {
          const stride = 4 * (100 * y + x);
          data[stride] = Math.round(255 * y / 99);
          data[stride + 1] = Math.round(255 - 255 * y / 99);
          data[stride + 2] = 0;
          data[stride + 3] = 255;
        }
      }
      const gradientTexture = new THREE.DataTexture(data, 100, 100, THREE.RGBAFormat);
      gradientTexture.minFilter = THREE.LinearFilter;
      gradientTexture.magFilter = THREE.LinearFilter;
      gradientTexture.needsUpdate = true;
      scene1 = new THREE.Scene();
      scene1.name = "Scene1";
      camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 2e3);
      camera.position.set(600, 400, 0);
      camera.name = "PerspectiveCamera";
      scene1.add(camera);
      const ambientLight = new THREE.AmbientLight(13421772);
      ambientLight.name = "AmbientLight";
      scene1.add(ambientLight);
      const dirLight = new THREE.DirectionalLight(16777215, 3);
      dirLight.target.position.set(0, 0, -1);
      dirLight.add(dirLight.target);
      dirLight.lookAt(-1, -1, 0);
      dirLight.name = "DirectionalLight";
      scene1.add(dirLight);
      gridHelper = new THREE.GridHelper(2e3, 20, 12698049, 9276813);
      gridHelper.position.y = -50;
      gridHelper.name = "Grid";
      scene1.add(gridHelper);
      const axes = new THREE.AxesHelper(500);
      axes.name = "AxesHelper";
      scene1.add(axes);
      const mapGrid = new THREE.TextureLoader().load("textures/uv_grid_opengl.jpg");
      mapGrid.wrapS = mapGrid.wrapT = THREE.RepeatWrapping;
      mapGrid.colorSpace = THREE.SRGBColorSpace;
      material = new THREE.MeshBasicMaterial({
        color: 16777215,
        map: mapGrid
      });
      object = new THREE.Mesh(new THREE.IcosahedronGeometry(75, 0), material);
      object.position.set(-200, 0, 200);
      object.name = "Icosahedron";
      scene1.add(object);
      material = new THREE.MeshBasicMaterial({
        color: 255,
        wireframe: true
      });
      object = new THREE.Mesh(new THREE.OctahedronGeometry(75, 1), material);
      object.position.set(0, 0, 200);
      object.name = "Octahedron";
      scene1.add(object);
      material = new THREE.MeshBasicMaterial({
        color: 16711680,
        transparent: true,
        opacity: 0.5
      });
      object = new THREE.Mesh(new THREE.TetrahedronGeometry(75, 0), material);
      object.position.set(200, 0, 200);
      object.name = "Tetrahedron";
      scene1.add(object);
      material = new THREE.MeshStandardMaterial({
        color: 16776960,
        metalness: 0.5,
        roughness: 1,
        flatShading: true
      });
      material.map = gradientTexture;
      material.bumpMap = mapGrid;
      sphere = new THREE.Mesh(new THREE.SphereGeometry(70, 10, 10), material);
      sphere.position.set(0, 0, 0);
      sphere.name = "Sphere";
      scene1.add(sphere);
      material = new THREE.MeshStandardMaterial({
        color: 16711935,
        flatShading: true
      });
      object = new THREE.Mesh(new THREE.CylinderGeometry(10, 80, 100), material);
      object.position.set(200, 0, 0);
      object.name = "Cylinder";
      scene1.add(object);
      material = new THREE.MeshStandardMaterial({
        color: 16711680,
        roughness: 1
      });
      object = new THREE.Mesh(new THREE.TorusKnotGeometry(50, 15, 40, 10), material);
      object.position.set(-200, 0, 0);
      object.name = "Cylinder";
      scene1.add(object);
      const mapWood = new THREE.TextureLoader().load("textures/hardwood2_diffuse.jpg");
      material = new THREE.MeshStandardMaterial({ map: mapWood, side: THREE.DoubleSide });
      object = new THREE.Mesh(new THREE.BoxGeometry(40, 100, 100), material);
      object.position.set(-200, 0, 400);
      object.name = "Cube";
      scene1.add(object);
      object2 = new THREE.Mesh(new THREE.BoxGeometry(40, 40, 40, 2, 2, 2), material);
      object2.position.set(0, 0, 50);
      object2.rotation.set(0, 45, 0);
      object2.name = "SubCube";
      object.add(object2);
      const group1 = new THREE.Group();
      group1.name = "Group";
      scene1.add(group1);
      const group2 = new THREE.Group();
      group2.name = "subGroup";
      group2.position.set(0, 50, 0);
      group1.add(group2);
      object2 = new THREE.Mesh(new THREE.BoxGeometry(30, 30, 30), material);
      object2.name = "Cube in group";
      object2.position.set(0, 0, 400);
      group2.add(object2);
      geometry = new THREE.BufferGeometry();
      let numPoints = 100;
      let positions = new Float32Array(numPoints * 3);
      for (let i = 0; i < numPoints; i++) {
        positions[i * 3] = i;
        positions[i * 3 + 1] = Math.sin(i / 2) * 20;
        positions[i * 3 + 2] = 0;
      }
      geometry.setAttribute("position", new THREE.BufferAttribute(positions, 3));
      object = new THREE.Line(geometry, new THREE.LineBasicMaterial({ color: 16776960 }));
      object.position.set(-50, 0, -200);
      scene1.add(object);
      geometry = new THREE.BufferGeometry();
      numPoints = 5;
      const radius = 70;
      positions = new Float32Array(numPoints * 3);
      for (let i = 0; i < numPoints; i++) {
        const s = i * Math.PI * 2 / numPoints;
        positions[i * 3] = radius * Math.sin(s);
        positions[i * 3 + 1] = radius * Math.cos(s);
        positions[i * 3 + 2] = 0;
      }
      geometry.setAttribute("position", new THREE.BufferAttribute(positions, 3));
      object = new THREE.LineLoop(geometry, new THREE.LineBasicMaterial({ color: 16776960 }));
      object.position.set(0, 0, -200);
      scene1.add(object);
      numPoints = 100;
      const pointsArray = new Float32Array(numPoints * 3);
      for (let i = 0; i < numPoints; i++) {
        pointsArray[3 * i] = -50 + Math.random() * 100;
        pointsArray[3 * i + 1] = Math.random() * 100;
        pointsArray[3 * i + 2] = -50 + Math.random() * 100;
      }
      const pointsGeo = new THREE.BufferGeometry();
      pointsGeo.setAttribute("position", new THREE.BufferAttribute(pointsArray, 3));
      const pointsMaterial = new THREE.PointsMaterial({ color: 16776960, size: 5 });
      const pointCloud = new THREE.Points(pointsGeo, pointsMaterial);
      pointCloud.name = "Points";
      pointCloud.position.set(-200, 0, -200);
      scene1.add(pointCloud);
      const cameraOrtho = new THREE.OrthographicCamera(
        window.innerWidth / -2,
        window.innerWidth / 2,
        window.innerHeight / 2,
        window.innerHeight / -2,
        0.1,
        10
      );
      scene1.add(cameraOrtho);
      cameraOrtho.name = "OrthographicCamera";
      material = new THREE.MeshLambertMaterial({
        color: 16776960,
        side: THREE.DoubleSide
      });
      object = new THREE.Mesh(new THREE.CircleGeometry(50, 20, 0, Math.PI * 2), material);
      object.position.set(200, 0, -400);
      scene1.add(object);
      object = new THREE.Mesh(new THREE.RingGeometry(10, 50, 20, 5, 0, Math.PI * 2), material);
      object.position.set(0, 0, -400);
      scene1.add(object);
      object = new THREE.Mesh(new THREE.CylinderGeometry(25, 75, 100, 40, 5), material);
      object.position.set(-200, 0, -400);
      scene1.add(object);
      const points = [];
      for (let i = 0; i < 50; i++) {
        points.push(
          new THREE.Vector2(Math.sin(i * 0.2) * Math.sin(i * 0.1) * 15 + 50, (i - 5) * 2)
        );
      }
      object = new THREE.Mesh(new THREE.LatheGeometry(points, 20), material);
      object.position.set(200, 0, 400);
      scene1.add(object);
      material = new THREE.MeshBasicMaterial({
        color: 16711680
      });
      object = new THREE.Mesh(new THREE.BoxGeometry(200, 200, 200), material);
      object.position.set(0, 0, 0);
      object.name = "CubeHidden";
      object.visible = false;
      scene1.add(object);
      const loader = new GLTFLoader();
      loader.load("models/gltf/ShaderBall.glb", function(gltf) {
        model = gltf.scene;
        model.scale.setScalar(50);
        model.position.set(200, -40, -200);
        scene1.add(model);
      });
      material = new THREE.MeshBasicMaterial({
        color: 16777215
      });
      object = new THREE.InstancedMesh(new THREE.BoxGeometry(10, 10, 10, 2, 2, 2), material, 50);
      const matrix = new THREE.Matrix4();
      const color = new THREE.Color();
      for (let i = 0; i < 50; i++) {
        matrix.setPosition(
          Math.random() * 100 - 50,
          Math.random() * 100 - 50,
          Math.random() * 100 - 50
        );
        object.setMatrixAt(i, matrix);
        object.setColorAt(i, color.setHSL(i / 50, 1, 0.5));
      }
      object.position.set(400, 0, 200);
      scene1.add(object);
      scene2 = new THREE.Scene();
      object = new THREE.Mesh(new THREE.BoxGeometry(100, 100, 100), material);
      object.position.set(0, 0, 0);
      object.name = "Cube2ndScene";
      scene2.name = "Scene2";
      scene2.add(object);
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      renderer.toneMapping = THREE.ACESFilmicToneMapping;
      renderer.toneMappingExposure = 1;
      window.addEventListener("resize", onWindowResize);
      const ktx2Loader = new KTX2Loader().setTranscoderPath("jsm/libs/basis/").detectSupport(renderer);
      const gltfLoader = new GLTFLoader().setPath("models/gltf/");
      gltfLoader.setKTX2Loader(ktx2Loader);
      gltfLoader.setMeshoptDecoder(MeshoptDecoder);
      gltfLoader.load("coffeemat.glb", function(gltf) {
        gltf.scene.position.x = 400;
        gltf.scene.position.z = -200;
        scene1.add(gltf.scene);
        coffeemat = gltf.scene;
      });
      const gui = new GUI();
      let h = gui.addFolder("Settings");
      h.add(params, "trs").name("Use TRS");
      h.add(params, "onlyVisible").name("Only Visible Objects");
      h.add(params, "binary").name("Binary (GLB)");
      h.add(params, "maxTextureSize", 2, 8192).name("Max Texture Size").step(1);
      h = gui.addFolder("Export");
      h.add(params, "exportScene1").name("Export Scene 1");
      h.add(params, "exportScenes").name("Export Scene 1 and 2");
      h.add(params, "exportSphere").name("Export Sphere");
      h.add(params, "exportModel").name("Export Model");
      h.add(params, "exportObjects").name("Export Sphere With Grid");
      h.add(params, "exportSceneObject").name("Export Scene 1 and Object");
      h.add(params, "exportCompressedObject").name("Export Coffeemat (from compressed data)");
      gui.open();
      needToDispose(renderer, scene1, scene2);
    }
    function exportScene1() {
      exportGLTF(scene1);
    }
    function exportScenes() {
      exportGLTF([scene1, scene2]);
    }
    function exportSphere() {
      exportGLTF(sphere);
    }
    function exportModel() {
      exportGLTF(model);
    }
    function exportObjects() {
      exportGLTF([sphere, gridHelper]);
    }
    function exportSceneObject() {
      exportGLTF([scene1, gridHelper]);
    }
    function exportCompressedObject() {
      exportGLTF([coffeemat]);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function animate() {
      const timer = Date.now() * 1e-4;
      camera.position.x = Math.cos(timer) * 800;
      camera.position.z = Math.sin(timer) * 800;
      camera.lookAt(scene1.position);
      renderer.render(scene1, camera);
    }
  }
};
export {
  exampleInfo as default
};

typings.d.ts

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;