misc_exporter_usdz

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 { RoomEnvironment } from "three/examples/jsm/environments/RoomEnvironment.js";
import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";
import { USDZExporter } from "three/examples/jsm/exporters/USDZExporter.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "misc_exporter_usdz",
  useLoaders: [GLTFLoader],
  info: [
    [
      { tag: "a", link: "https://threejs.org", content: "three.js" },
      { tag: "text", content: "- USDZ exporter" }
    ],
    [
      { tag: "text", content: "Battle Damaged Sci-fi Helmet by" },
      { tag: "a", link: "https://sketchfab.com/theblueturtle_", content: "theblueturtle_" }
    ]
  ],
  init: ({
    window,
    canvas,
    GUI,
    Stats,
    needToDispose,
    useFrame,
    saveFile,
    requestLoading,
    cancelLoading
  }) => {
    let camera, scene, renderer;
    const params = {
      exportUSDZ() {
      }
    };
    init();
    render();
    function init() {
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.toneMapping = THREE.ACESFilmicToneMapping;
      camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.25, 20);
      camera.position.set(-2.5, 0.6, 3);
      const pmremGenerator = new THREE.PMREMGenerator(renderer);
      scene = new THREE.Scene();
      scene.background = new THREE.Color(15790320);
      scene.environment = pmremGenerator.fromScene(new RoomEnvironment(), 0.04).texture;
      const loader = new GLTFLoader().setPath("models/gltf/DamagedHelmet/glTF/");
      loader.load("DamagedHelmet.gltf", async function(gltf) {
        scene.add(gltf.scene);
        const shadowMesh = createSpotShadowMesh();
        shadowMesh.position.y = -1.1;
        shadowMesh.position.z = -0.25;
        shadowMesh.scale.setScalar(2);
        scene.add(shadowMesh);
        render();
        params.exportUSDZ = async function() {
          try {
            await requestLoading("生成中");
            const exporter = new USDZExporter();
            const result = await exporter.parseAsync(gltf.scene);
            await saveFile("asset.usdz", result.buffer);
          } catch (e) {
          } finally {
            cancelLoading();
          }
        };
      });
      const controls = new OrbitControls(camera, renderer.domElement);
      controls.addEventListener("change", render);
      controls.minDistance = 2;
      controls.maxDistance = 10;
      controls.target.set(0, -0.15, -0.2);
      controls.update();
      window.addEventListener("resize", onWindowResize);
      const gui = new GUI();
      gui.add(params, "exportUSDZ").name("Export USDZ");
      gui.open();
      needToDispose(renderer, scene, controls);
    }
    function createSpotShadowMesh() {
      const canvas2 = document.createElement("canvas");
      canvas2.width = 128;
      canvas2.height = 128;
      const context = canvas2.getContext("2d");
      const gradient = context.createRadialGradient(
        canvas2.width / 2,
        canvas2.height / 2,
        0,
        canvas2.width / 2,
        canvas2.height / 2,
        canvas2.width / 2
      );
      gradient.addColorStop(0.1, "rgba(130,130,130,1)");
      gradient.addColorStop(1, "rgba(255,255,255,1)");
      context.fillStyle = gradient;
      context.fillRect(0, 0, canvas2.width, canvas2.height);
      const shadowTexture = new THREE.CanvasTexture(canvas2);
      const geometry = new THREE.PlaneGeometry();
      const material = new THREE.MeshBasicMaterial({
        map: shadowTexture,
        blending: THREE.MultiplyBlending,
        toneMapped: false
      });
      const mesh = new THREE.Mesh(geometry, material);
      mesh.rotation.x = -Math.PI / 2;
      return mesh;
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
      render();
    }
    function render() {
      renderer.render(scene, camera);
    }
  }
};
export {
  exampleInfo as default
};

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_usdz ​

misc_exporter_usdz