webgl_loader_ldraw

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 { OrbitControls } from "three/examples/jsm/controls/OrbitControls.js";
import { RoomEnvironment } from "three/examples/jsm/environments/RoomEnvironment.js";
import { LDrawLoader } from "three/examples/jsm/loaders/LDrawLoader.js";
import { LDrawUtils } from "three/examples/jsm/utils/LDrawUtils.js";
import { LDrawConditionalLineMaterial } from "three/examples/jsm/materials/LDrawConditionalLineMaterial.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_loader_ldraw",
  useLoaders: [LDrawLoader],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- LDrawLoader"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let camera, scene, renderer, controls, gui, guiData;
    let model;
    const ldrawPath = "models/ldraw/officialLibrary/";
    const modelFileList = {
      Car: "models/car.ldr_Packed.mpd",
      "Lunar Vehicle": "models/1621-1-LunarMPVVehicle.mpd_Packed.mpd",
      "Radar Truck": "models/889-1-RadarTruck.mpd_Packed.mpd",
      Trailer: "models/4838-1-MiniVehicles.mpd_Packed.mpd",
      Bulldozer: "models/4915-1-MiniConstruction.mpd_Packed.mpd",
      Helicopter: "models/4918-1-MiniFlyers.mpd_Packed.mpd",
      Plane: "models/5935-1-IslandHopper.mpd_Packed.mpd",
      Lighthouse: "models/30023-1-Lighthouse.ldr_Packed.mpd",
      "X-Wing mini": "models/30051-1-X-wingFighter-Mini.mpd_Packed.mpd",
      "AT-ST mini": "models/30054-1-AT-ST-Mini.mpd_Packed.mpd",
      "AT-AT mini": "models/4489-1-AT-AT-Mini.mpd_Packed.mpd",
      Shuttle: "models/4494-1-Imperial Shuttle-Mini.mpd_Packed.mpd",
      "TIE Interceptor": "models/6965-1-TIEIntercep_4h4MXk5.mpd_Packed.mpd",
      "Star fighter": "models/6966-1-JediStarfighter-Mini.mpd_Packed.mpd",
      "X-Wing": "models/7140-1-X-wingFighter.mpd_Packed.mpd",
      "AT-ST": "models/10174-1-ImperialAT-ST-UCS.mpd_Packed.mpd"
    };
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1e4);
      camera.position.set(150, 200, 250);
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      renderer.toneMapping = THREE.ACESFilmicToneMapping;
      const pmremGenerator = new THREE.PMREMGenerator(renderer);
      scene = new THREE.Scene();
      scene.background = new THREE.Color(14609389);
      scene.environment = pmremGenerator.fromScene(new RoomEnvironment()).texture;
      controls = new OrbitControls(camera, renderer.domElement);
      controls.enableDamping = true;
      guiData = {
        modelFileName: modelFileList["Car"],
        displayLines: true,
        conditionalLines: true,
        smoothNormals: true,
        buildingStep: 0,
        noBuildingSteps: "No steps.",
        flatColors: false,
        mergeModel: false
      };
      window.addEventListener("resize", onWindowResize);
      reloadObject(true);
      needToDispose(renderer, scene, controls);
    }
    function updateObjectsVisibility() {
      model.traverse((c) => {
        if (c.isLineSegments) {
          if (c.isConditionalLine) {
            c.visible = guiData.conditionalLines;
          } else {
            c.visible = guiData.displayLines;
          }
        } else if (c.isGroup) {
          c.visible = c.userData.buildingStep <= guiData.buildingStep;
        }
      });
    }
    function reloadObject(resetCamera) {
      if (model) {
        scene.remove(model);
      }
      model = null;
      const lDrawLoader = new LDrawLoader();
      lDrawLoader.setConditionalLineMaterial(LDrawConditionalLineMaterial);
      lDrawLoader.smoothNormals = guiData.smoothNormals && !guiData.flatColors;
      lDrawLoader.setPath(ldrawPath).load(guiData.modelFileName, function(group2) {
        if (model) {
          scene.remove(model);
        }
        model = group2;
        if (guiData.flatColors) {
          let convertMaterial = function(material) {
            const newMaterial = new THREE.MeshBasicMaterial();
            newMaterial.color.copy(material.color);
            newMaterial.polygonOffset = material.polygonOffset;
            newMaterial.polygonOffsetUnits = material.polygonOffsetUnits;
            newMaterial.polygonOffsetFactor = material.polygonOffsetFactor;
            newMaterial.opacity = material.opacity;
            newMaterial.transparent = material.transparent;
            newMaterial.depthWrite = material.depthWrite;
            newMaterial.toneMapping = false;
            return newMaterial;
          };
          model.traverse((c) => {
            if (c.isMesh) {
              if (Array.isArray(c.material)) {
                c.material = c.material.map(convertMaterial);
              } else {
                c.material = convertMaterial(c.material);
              }
            }
          });
        }
        if (guiData.mergeModel) model = LDrawUtils.mergeObject(model);
        model.rotation.x = Math.PI;
        scene.add(model);
        guiData.buildingStep = model.userData.numBuildingSteps - 1;
        updateObjectsVisibility();
        const bbox = new THREE.Box3().setFromObject(model);
        const size = bbox.getSize(new THREE.Vector3());
        const radius = Math.max(size.x, Math.max(size.y, size.z)) * 0.5;
        if (resetCamera) {
          controls.target0.copy(bbox.getCenter(new THREE.Vector3()));
          controls.position0.set(-2.3, 1, 2).multiplyScalar(radius).add(controls.target0);
          controls.reset();
        }
        createGUI();
      });
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function createGUI() {
      if (gui) {
        gui.destroy();
      }
      gui = new GUI();
      gui.add(guiData, "modelFileName", modelFileList).name("Model").onFinishChange(function() {
        reloadObject(true);
      });
      gui.add(guiData, "flatColors").name("Flat Colors").onChange(function() {
        reloadObject(false);
      });
      gui.add(guiData, "mergeModel").name("Merge model").onChange(function() {
        reloadObject(false);
      });
      if (model.userData.numBuildingSteps > 1) {
        gui.add(guiData, "buildingStep", 0, model.userData.numBuildingSteps - 1).step(1).name("Building step").onChange(updateObjectsVisibility);
      } else {
        gui.add(guiData, "noBuildingSteps").name("Building step").onChange(updateObjectsVisibility);
      }
      gui.add(guiData, "smoothNormals").name("Smooth Normals").onChange(function changeNormals() {
        reloadObject(false);
      });
      gui.add(guiData, "displayLines").name("Display Lines").onChange(updateObjectsVisibility);
      gui.add(guiData, "conditionalLines").name("Conditional Lines").onChange(updateObjectsVisibility);
    }
    function animate() {
      controls.update();
      render();
    }
    function render() {
      renderer.render(scene, 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;