webgl_modifier_subdivision

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 { LoopSubdivision } from "three-subdivide";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_modifier_subdivision",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "webgl - modifier -"
      },
      {
        tag: "a",
        link: "https://github.com/stevinz/three-subdivide",
        content: "subdivision"
      }
    ],
    [
      {
        tag: "text",
        content: "See external"
      },
      {
        tag: "a",
        link: "https://github.com/stevinz/three-subdivide",
        content: "three-subdivide"
      },
      {
        tag: "text",
        content: "for more information on subdivision surfaces."
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let renderer, scene, camera;
    let texture;
    let meshNormal, meshSmooth;
    let wireNormal, wireSmooth;
    let wireMaterial;
    const params = {
      geometry: "Box",
      iterations: 3,
      split: true,
      uvSmooth: false,
      preserveEdges: false,
      flatOnly: false,
      maxTriangles: 25e3,
      flatShading: false,
      textured: true,
      wireframe: false
    };
    init();
    function init() {
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      scene = new THREE.Scene();
      camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight);
      camera.position.set(0, 0.7, 2.1);
      const controls = new OrbitControls(camera, renderer.domElement);
      controls.addEventListener("change", render);
      controls.rotateSpeed = 0.5;
      controls.minZoom = 1;
      controls.target.set(0, 0, 0);
      controls.update();
      scene.add(new THREE.HemisphereLight(16777215, 7566195, 3));
      const frontLight = new THREE.DirectionalLight(16777215, 1.5);
      const backLight = new THREE.DirectionalLight(16777215, 1.5);
      frontLight.position.set(0, 1, 1);
      backLight.position.set(0, 1, -1);
      scene.add(frontLight, backLight);
      texture = new THREE.TextureLoader().load("./textures/uv_grid_opengl.jpg", () => {
        texture.wrapS = THREE.RepeatWrapping;
        texture.wrapT = THREE.RepeatWrapping;
        texture.colorSpace = THREE.SRGBColorSpace;
        render();
      });
      meshNormal = new THREE.Mesh(new THREE.BufferGeometry(), new THREE.MeshBasicMaterial());
      meshSmooth = new THREE.Mesh(new THREE.BufferGeometry(), new THREE.MeshBasicMaterial());
      meshNormal.position.set(-0.7, 0, 0);
      meshSmooth.position.set(0.7, 0, 0);
      scene.add(meshNormal, meshSmooth);
      wireMaterial = new THREE.MeshBasicMaterial({
        color: 16777215,
        depthTest: true,
        wireframe: true
      });
      wireNormal = new THREE.Mesh(new THREE.BufferGeometry(), wireMaterial);
      wireSmooth = new THREE.Mesh(new THREE.BufferGeometry(), wireMaterial);
      wireNormal.visible = false;
      wireSmooth.visible = false;
      wireNormal.position.copy(meshNormal.position);
      wireSmooth.position.copy(meshSmooth.position);
      scene.add(wireNormal, wireSmooth);
      updateMeshes();
      window.addEventListener("resize", onWindowResize);
      const geomTypes = [
        "Box",
        "Capsule",
        "Circle",
        "Cone",
        "Cylinder",
        "Dodecahedron",
        "Icosahedron",
        "Lathe",
        "Octahedron",
        "Plane",
        "Ring",
        "Sphere",
        "Tetrahedron",
        "Torus",
        "TorusKnot"
      ];
      const gui = new GUI();
      const folder1 = gui.addFolder("Subdivide Params");
      const geomController = folder1.add(params, "geometry", geomTypes).onFinishChange(() => {
        const geom = params.geometry.toLowerCase();
        params.split = geom === "box" || geom === "ring" || geom === "plane";
        params.uvSmooth = geom === "circle" || geom === "plane" || geom === "ring";
        refreshDisplay();
      });
      folder1.add(params, "iterations").min(0).max(5).step(1).onFinishChange(updateMeshes);
      const splitController = folder1.add(params, "split").onFinishChange(updateMeshes);
      const uvSmoothController = folder1.add(params, "uvSmooth").onFinishChange(updateMeshes);
      const preserveController = folder1.add(params, "preserveEdges").onFinishChange(updateMeshes);
      folder1.add(params, "flatOnly").onFinishChange(updateMeshes);
      folder1.add(params, "maxTriangles").onFinishChange(updateMeshes);
      const folder2 = gui.addFolder("Material");
      folder2.add(params, "flatShading").onFinishChange(updateMaterial);
      folder2.add(params, "textured").onFinishChange(updateMaterial);
      folder2.add(params, "wireframe").onFinishChange(updateWireframe);
      function refreshDisplay() {
        geomController.updateDisplay();
        splitController.updateDisplay();
        uvSmoothController.updateDisplay();
        preserveController.updateDisplay();
        updateMeshes();
      }
      needToDispose(renderer, scene, controls);
    }
    function getGeometry() {
      switch (params.geometry.toLowerCase()) {
        case "box":
          return new THREE.BoxGeometry();
        case "capsule":
          return new THREE.CapsuleGeometry(0.5, 0.5, 3, 5);
        case "circle":
          return new THREE.CircleGeometry(0.6, 10);
        case "cone":
          return new THREE.ConeGeometry(0.6, 1.5, 5, 3);
        case "cylinder":
          return new THREE.CylinderGeometry(0.5, 0.5, 1, 5, 4);
        case "dodecahedron":
          return new THREE.DodecahedronGeometry(0.6);
        case "icosahedron":
          return new THREE.IcosahedronGeometry(0.6);
        case "lathe":
          const points = [];
          for (let i = 0; i < 65; i += 5) {
            const x = (Math.sin(i * 0.2) * Math.sin(i * 0.1) * 15 + 50) * 1.2;
            const y = (i - 5) * 3;
            points.push(new THREE.Vector2(x * 75e-4, y * 5e-3));
          }
          const latheGeometry = new THREE.LatheGeometry(points, 4);
          latheGeometry.center();
          return latheGeometry;
        case "octahedron":
          return new THREE.OctahedronGeometry(0.7);
        case "plane":
          return new THREE.PlaneGeometry();
        case "ring":
          return new THREE.RingGeometry(0.3, 0.6, 10);
        case "sphere":
          return new THREE.SphereGeometry(0.6, 8, 4);
        case "tetrahedron":
          return new THREE.TetrahedronGeometry(0.8);
        case "torus":
          return new THREE.TorusGeometry(0.48, 0.24, 4, 6);
        case "torusknot":
          return new THREE.TorusKnotGeometry(0.38, 0.18, 20, 4);
      }
    }
    function updateMeshes() {
      const normalGeometry = getGeometry();
      const smoothGeometry = LoopSubdivision.modify(normalGeometry, params.iterations, params);
      meshNormal.geometry.dispose();
      meshSmooth.geometry.dispose();
      meshNormal.geometry = normalGeometry;
      meshSmooth.geometry = smoothGeometry;
      wireNormal.geometry.dispose();
      wireSmooth.geometry.dispose();
      wireNormal.geometry = normalGeometry.clone();
      wireSmooth.geometry = smoothGeometry.clone();
      updateMaterial();
    }
    function disposeMaterial(material) {
      const materials = Array.isArray(material) ? material : [material];
      for (let i = 0; i < materials.length; i++) {
        if (materials[i].dispose) materials[i].dispose();
      }
    }
    function updateMaterial() {
      disposeMaterial(meshNormal.material);
      disposeMaterial(meshSmooth.material);
      const materialParams = {
        color: params.textured ? 16777215 : 8421504,
        flatShading: params.flatShading,
        map: params.textured ? texture : null,
        polygonOffset: true,
        polygonOffsetFactor: 1,
        // positive value pushes polygon further away
        polygonOffsetUnits: 1
      };
      switch (params.geometry.toLowerCase()) {
        case "circle":
        case "lathe":
        case "plane":
        case "ring":
          materialParams.side = THREE.DoubleSide;
          break;
        case "box":
        case "capsule":
        case "cone":
        case "cylinder":
        case "dodecahedron":
        case "icosahedron":
        case "octahedron":
        case "sphere":
        case "tetrahedron":
        case "torus":
        case "torusknot":
          materialParams.side = THREE.FrontSide;
          break;
      }
      meshNormal.material = meshSmooth.material = new THREE.MeshStandardMaterial(materialParams);
      render();
    }
    function updateWireframe() {
      wireNormal.visible = wireSmooth.visible = params.wireframe;
      render();
    }
    function onWindowResize() {
      renderer.setSize(window.innerWidth, window.innerHeight);
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      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;