webgl_points_dynamic

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 { EffectComposer } from "three/examples/jsm/postprocessing/EffectComposer.js";
import { RenderPass } from "three/examples/jsm/postprocessing/RenderPass.js";
import { ShaderPass } from "three/examples/jsm/postprocessing/ShaderPass.js";
import { BloomPass } from "three/examples/jsm/postprocessing/BloomPass.js";
import { FilmPass } from "three/examples/jsm/postprocessing/FilmPass.js";
import { FocusShader } from "three/examples/jsm/shaders/FocusShader.js";
import { OBJLoader } from "three/examples/jsm/loaders/OBJLoader.js";
import { OutputPass } from "three/examples/jsm/postprocessing/OutputPass.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_points_dynamic",
  useLoaders: [OBJLoader],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- webgl dynamic particles + postprocessing"
      }
    ],
    [
      {
        tag: "text",
        content: "models by"
      },
      {
        tag: "a",
        link: "http://sketchup.google.com/3dwarehouse/details?mid=2c6fd128fca34052adc5f5b98d513da1",
        content: "Reallusion"
      },
      {
        tag: "a",
        link: "http://sketchup.google.com/3dwarehouse/details?mid=f526cc4abf7cb68d76cab47c765b7255",
        content: "iClone"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let camera, scene, renderer, mesh;
    let parent;
    const meshes = [], clonemeshes = [];
    let composer, effectFocus;
    const clock = new THREE.Clock();
    let stats;
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(20, window.innerWidth / window.innerHeight, 1, 5e4);
      camera.position.set(0, 700, 7e3);
      scene = new THREE.Scene();
      scene.background = new THREE.Color(260);
      scene.fog = new THREE.FogExp2(260, 675e-7);
      camera.lookAt(scene.position);
      const loader = new OBJLoader();
      loader.load("models/obj/male02/male02.obj", function(object) {
        const positions = combineBuffer(object, "position");
        createMesh(positions, scene, 4.05, -500, -350, 600, 16742212);
        createMesh(positions, scene, 4.05, 500, -350, 0, 16733474);
        createMesh(positions, scene, 4.05, -250, -350, 1500, 16750882);
        createMesh(positions, scene, 4.05, -250, -350, -1500, 16751103);
      });
      loader.load("models/obj/female02/female02.obj", function(object) {
        const positions = combineBuffer(object, "position");
        createMesh(positions, scene, 4.05, -1e3, -350, 0, 16768324);
        createMesh(positions, scene, 4.05, 0, -350, 0, 16777215);
        createMesh(positions, scene, 4.05, 1e3, -350, 400, 16729122);
        createMesh(positions, scene, 4.05, 250, -350, 1500, 16750933);
        createMesh(positions, scene, 4.05, 250, -350, 2500, 16742365);
      });
      renderer = new THREE.WebGLRenderer({ canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      renderer.autoClear = false;
      parent = new THREE.Object3D();
      scene.add(parent);
      const grid = new THREE.Points(
        new THREE.PlaneGeometry(15e3, 15e3, 64, 64),
        new THREE.PointsMaterial({ color: 16711680, size: 10 })
      );
      grid.position.y = -400;
      grid.rotation.x = -Math.PI / 2;
      parent.add(grid);
      const renderModel = new RenderPass(scene, camera);
      const effectBloom = new BloomPass(0.75);
      const effectFilm = new FilmPass();
      effectFocus = new ShaderPass(FocusShader);
      effectFocus.uniforms["screenWidth"].value = window.innerWidth * window.devicePixelRatio;
      effectFocus.uniforms["screenHeight"].value = window.innerHeight * window.devicePixelRatio;
      const outputPass = new OutputPass();
      composer = new EffectComposer(renderer);
      composer.addPass(renderModel);
      composer.addPass(effectBloom);
      composer.addPass(effectFilm);
      composer.addPass(effectFocus);
      composer.addPass(outputPass);
      stats = new Stats(renderer);
      window.addEventListener("resize", onWindowResize);
      needToDispose(renderer, scene);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      camera.lookAt(scene.position);
      renderer.setSize(window.innerWidth, window.innerHeight);
      composer.setSize(window.innerWidth, window.innerHeight);
      effectFocus.uniforms["screenWidth"].value = window.innerWidth * window.devicePixelRatio;
      effectFocus.uniforms["screenHeight"].value = window.innerHeight * window.devicePixelRatio;
    }
    function combineBuffer(model, bufferName) {
      let count = 0;
      model.traverse(function(child) {
        if (child.isMesh) {
          const buffer = child.geometry.attributes[bufferName];
          count += buffer.array.length;
        }
      });
      const combined = new Float32Array(count);
      let offset = 0;
      model.traverse(function(child) {
        if (child.isMesh) {
          const buffer = child.geometry.attributes[bufferName];
          combined.set(buffer.array, offset);
          offset += buffer.array.length;
        }
      });
      return new THREE.BufferAttribute(combined, 3);
    }
    function createMesh(positions, scene2, scale, x, y, z, color) {
      const geometry = new THREE.BufferGeometry();
      geometry.setAttribute("position", positions.clone());
      geometry.setAttribute("initialPosition", positions.clone());
      geometry.attributes.position.setUsage(THREE.DynamicDrawUsage);
      const clones = [
        [6e3, 0, -4e3],
        [5e3, 0, 0],
        [1e3, 0, 5e3],
        [1e3, 0, -5e3],
        [4e3, 0, 2e3],
        [-4e3, 0, 1e3],
        [-5e3, 0, -5e3],
        [0, 0, 0]
      ];
      for (let i = 0; i < clones.length; i++) {
        const c = i < clones.length - 1 ? 2434341 : color;
        mesh = new THREE.Points(geometry, new THREE.PointsMaterial({ size: 30, color: c }));
        mesh.scale.x = mesh.scale.y = mesh.scale.z = scale;
        mesh.position.x = x + clones[i][0];
        mesh.position.y = y + clones[i][1];
        mesh.position.z = z + clones[i][2];
        parent.add(mesh);
        clonemeshes.push({ mesh, speed: 0.5 + Math.random() });
      }
      meshes.push({
        mesh,
        verticesDown: 0,
        verticesUp: 0,
        direction: 0,
        speed: 15,
        delay: Math.floor(200 + 200 * Math.random()),
        start: Math.floor(100 + 200 * Math.random())
      });
    }
    function animate() {
      render();
      stats.update();
    }
    function render() {
      let delta = 10 * clock.getDelta();
      delta = delta < 2 ? delta : 2;
      parent.rotation.y += -0.02 * delta;
      for (let j = 0; j < clonemeshes.length; j++) {
        const cm = clonemeshes[j];
        cm.mesh.rotation.y += -0.1 * delta * cm.speed;
      }
      for (let j = 0; j < meshes.length; j++) {
        const data = meshes[j];
        const positions = data.mesh.geometry.attributes.position;
        const initialPositions = data.mesh.geometry.attributes.initialPosition;
        const count = positions.count;
        if (data.start > 0) {
          data.start -= 1;
        } else {
          if (data.direction === 0) {
            data.direction = -1;
          }
        }
        for (let i = 0; i < count; i++) {
          const px = positions.getX(i);
          const py = positions.getY(i);
          const pz = positions.getZ(i);
          if (data.direction < 0) {
            if (py > 0) {
              positions.setXYZ(
                i,
                px + 1.5 * (0.5 - Math.random()) * data.speed * delta,
                py + 3 * (0.25 - Math.random()) * data.speed * delta,
                pz + 1.5 * (0.5 - Math.random()) * data.speed * delta
              );
            } else {
              data.verticesDown += 1;
            }
          }
          if (data.direction > 0) {
            const ix = initialPositions.getX(i);
            const iy = initialPositions.getY(i);
            const iz = initialPositions.getZ(i);
            const dx = Math.abs(px - ix);
            const dy = Math.abs(py - iy);
            const dz = Math.abs(pz - iz);
            const d = dx + dy + dx;
            if (d > 1) {
              positions.setXYZ(
                i,
                px - (px - ix) / dx * data.speed * delta * (0.85 - Math.random()),
                py - (py - iy) / dy * data.speed * delta * (1 + Math.random()),
                pz - (pz - iz) / dz * data.speed * delta * (0.85 - Math.random())
              );
            } else {
              data.verticesUp += 1;
            }
          }
        }
        if (data.verticesDown >= count) {
          if (data.delay <= 0) {
            data.direction = 1;
            data.speed = 5;
            data.verticesDown = 0;
            data.delay = 320;
          } else {
            data.delay -= 1;
          }
        }
        if (data.verticesUp >= count) {
          if (data.delay <= 0) {
            data.direction = -1;
            data.speed = 15;
            data.verticesUp = 0;
            data.delay = 120;
          } else {
            data.delay -= 1;
          }
        }
        positions.needsUpdate = true;
      }
      composer.render(0.01);
    }
  }
};
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_points_dynamic ​

webgl_points_dynamic