webgl_interactive_buffergeometry

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";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_interactive_buffergeometry",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "webgl - interactive - buffergeometry"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let stats;
    let camera, scene, renderer;
    let raycaster, pointer;
    let mesh, line;
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(27, window.innerWidth / window.innerHeight, 1, 3500);
      camera.position.z = 2750;
      scene = new THREE.Scene();
      scene.background = new THREE.Color(328965);
      scene.fog = new THREE.Fog(328965, 2e3, 3500);
      scene.add(new THREE.AmbientLight(4473924, 3));
      const light1 = new THREE.DirectionalLight(16777215, 1.5);
      light1.position.set(1, 1, 1);
      scene.add(light1);
      const light2 = new THREE.DirectionalLight(16777215, 4.5);
      light2.position.set(0, -1, 0);
      scene.add(light2);
      const triangles = 5e3;
      let geometry = new THREE.BufferGeometry();
      const positions = new Float32Array(triangles * 3 * 3);
      const normals = new Float32Array(triangles * 3 * 3);
      const colors = new Float32Array(triangles * 3 * 3);
      const color = new THREE.Color();
      const n = 800, n2 = n / 2;
      const d = 120, d2 = d / 2;
      const pA = new THREE.Vector3();
      const pB = new THREE.Vector3();
      const pC = new THREE.Vector3();
      const cb = new THREE.Vector3();
      const ab = new THREE.Vector3();
      for (let i = 0; i < positions.length; i += 9) {
        const x = Math.random() * n - n2;
        const y = Math.random() * n - n2;
        const z = Math.random() * n - n2;
        const ax = x + Math.random() * d - d2;
        const ay = y + Math.random() * d - d2;
        const az = z + Math.random() * d - d2;
        const bx = x + Math.random() * d - d2;
        const by = y + Math.random() * d - d2;
        const bz = z + Math.random() * d - d2;
        const cx = x + Math.random() * d - d2;
        const cy = y + Math.random() * d - d2;
        const cz = z + Math.random() * d - d2;
        positions[i] = ax;
        positions[i + 1] = ay;
        positions[i + 2] = az;
        positions[i + 3] = bx;
        positions[i + 4] = by;
        positions[i + 5] = bz;
        positions[i + 6] = cx;
        positions[i + 7] = cy;
        positions[i + 8] = cz;
        pA.set(ax, ay, az);
        pB.set(bx, by, bz);
        pC.set(cx, cy, cz);
        cb.subVectors(pC, pB);
        ab.subVectors(pA, pB);
        cb.cross(ab);
        cb.normalize();
        const nx = cb.x;
        const ny = cb.y;
        const nz = cb.z;
        normals[i] = nx;
        normals[i + 1] = ny;
        normals[i + 2] = nz;
        normals[i + 3] = nx;
        normals[i + 4] = ny;
        normals[i + 5] = nz;
        normals[i + 6] = nx;
        normals[i + 7] = ny;
        normals[i + 8] = nz;
        const vx = x / n + 0.5;
        const vy = y / n + 0.5;
        const vz = z / n + 0.5;
        color.setRGB(vx, vy, vz);
        colors[i] = color.r;
        colors[i + 1] = color.g;
        colors[i + 2] = color.b;
        colors[i + 3] = color.r;
        colors[i + 4] = color.g;
        colors[i + 5] = color.b;
        colors[i + 6] = color.r;
        colors[i + 7] = color.g;
        colors[i + 8] = color.b;
      }
      geometry.setAttribute("position", new THREE.BufferAttribute(positions, 3));
      geometry.setAttribute("normal", new THREE.BufferAttribute(normals, 3));
      geometry.setAttribute("color", new THREE.BufferAttribute(colors, 3));
      geometry.computeBoundingSphere();
      let material = new THREE.MeshPhongMaterial({
        color: 11184810,
        specular: 16777215,
        shininess: 250,
        side: THREE.DoubleSide,
        vertexColors: true
      });
      mesh = new THREE.Mesh(geometry, material);
      scene.add(mesh);
      raycaster = new THREE.Raycaster();
      pointer = new THREE.Vector2();
      geometry = new THREE.BufferGeometry();
      geometry.setAttribute("position", new THREE.BufferAttribute(new Float32Array(4 * 3), 3));
      material = new THREE.LineBasicMaterial({ color: 16777215, transparent: true });
      line = new THREE.Line(geometry, material);
      scene.add(line);
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      stats = new Stats(renderer);
      window.addEventListener("resize", onWindowResize);
      canvas.addEventListener("pointermove", onPointerMove);
      needToDispose(renderer, scene);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function onPointerMove(event) {
      pointer.x = event.clientX / window.innerWidth * 2 - 1;
      pointer.y = -(event.clientY / window.innerHeight) * 2 + 1;
    }
    function animate() {
      render();
      stats.update();
    }
    function render() {
      const time = Date.now() * 1e-3;
      mesh.rotation.x = time * 0.15;
      mesh.rotation.y = time * 0.25;
      raycaster.setFromCamera(pointer, camera);
      const intersects = raycaster.intersectObject(mesh);
      if (intersects.length > 0) {
        const intersect = intersects[0];
        const face = intersect.face;
        const linePosition = line.geometry.attributes.position;
        const meshPosition = mesh.geometry.attributes.position;
        linePosition.copyAt(0, meshPosition, face.a);
        linePosition.copyAt(1, meshPosition, face.b);
        linePosition.copyAt(2, meshPosition, face.c);
        linePosition.copyAt(3, meshPosition, face.a);
        mesh.updateMatrix();
        line.geometry.applyMatrix4(mesh.matrix);
        line.visible = true;
      } else {
        line.visible = false;
      }
      renderer.render(scene, camera);
    }
  }
};
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;

webgl_interactive_buffergeometry ​

webgl_interactive_buffergeometry