webgl_shadowmesh

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 { ShadowMesh } from "three/examples/jsm/objects/ShadowMesh.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_shadowmesh",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- shadow mesh"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let SCREEN_WIDTH = window.innerWidth;
    let SCREEN_HEIGHT = window.innerHeight;
    const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera(55, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 3e3);
    const clock = new THREE.Clock();
    const renderer = new THREE.WebGLRenderer({ stencil: true, canvas });
    const sunLight = new THREE.DirectionalLight("rgb(255,255,255)", 3);
    let useDirectionalLight = true;
    let arrowHelper1, arrowHelper2, arrowHelper3;
    const arrowDirection = new THREE.Vector3();
    const arrowPosition1 = new THREE.Vector3();
    const arrowPosition2 = new THREE.Vector3();
    const arrowPosition3 = new THREE.Vector3();
    let groundMesh;
    let lightSphere, lightHolder;
    let pyramid, pyramidShadow;
    let sphere, sphereShadow;
    let cube, cubeShadow;
    let cylinder, cylinderShadow;
    let torus, torusShadow;
    const normalVector = new THREE.Vector3(0, 1, 0);
    const planeConstant = 0.01;
    const groundPlane = new THREE.Plane(normalVector, planeConstant);
    const lightPosition4D = new THREE.Vector4();
    let verticalAngle = 0;
    let horizontalAngle = 0;
    let frameTime = 0;
    const TWO_PI = Math.PI * 2;
    init();
    function init() {
      scene.background = new THREE.Color(38655);
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
      renderer.setAnimationLoop(animate);
      window.addEventListener("resize", onWindowResize);
      camera.position.set(0, 2.5, 10);
      scene.add(camera);
      onWindowResize();
      sunLight.position.set(5, 7, -1);
      sunLight.lookAt(scene.position);
      scene.add(sunLight);
      lightPosition4D.x = sunLight.position.x;
      lightPosition4D.y = sunLight.position.y;
      lightPosition4D.z = sunLight.position.z;
      lightPosition4D.w = 1e-3;
      arrowDirection.subVectors(scene.position, sunLight.position).normalize();
      arrowPosition1.copy(sunLight.position);
      arrowHelper1 = new THREE.ArrowHelper(
        arrowDirection,
        arrowPosition1,
        0.9,
        16776960,
        0.25,
        0.08
      );
      scene.add(arrowHelper1);
      arrowPosition2.copy(sunLight.position).add(new THREE.Vector3(0, 0.2, 0));
      arrowHelper2 = new THREE.ArrowHelper(
        arrowDirection,
        arrowPosition2,
        0.9,
        16776960,
        0.25,
        0.08
      );
      scene.add(arrowHelper2);
      arrowPosition3.copy(sunLight.position).add(new THREE.Vector3(0, -0.2, 0));
      arrowHelper3 = new THREE.ArrowHelper(
        arrowDirection,
        arrowPosition3,
        0.9,
        16776960,
        0.25,
        0.08
      );
      scene.add(arrowHelper3);
      const lightSphereGeometry = new THREE.SphereGeometry(0.09);
      const lightSphereMaterial = new THREE.MeshBasicMaterial({ color: "rgb(255,255,255)" });
      lightSphere = new THREE.Mesh(lightSphereGeometry, lightSphereMaterial);
      scene.add(lightSphere);
      lightSphere.visible = false;
      const lightHolderGeometry = new THREE.CylinderGeometry(0.05, 0.05, 0.13);
      const lightHolderMaterial = new THREE.MeshBasicMaterial({ color: "rgb(75,75,75)" });
      lightHolder = new THREE.Mesh(lightHolderGeometry, lightHolderMaterial);
      scene.add(lightHolder);
      lightHolder.visible = false;
      const groundGeometry = new THREE.BoxGeometry(30, 0.01, 40);
      const groundMaterial = new THREE.MeshLambertMaterial({ color: "rgb(0,130,0)" });
      groundMesh = new THREE.Mesh(groundGeometry, groundMaterial);
      groundMesh.position.y = 0;
      scene.add(groundMesh);
      const cubeGeometry = new THREE.BoxGeometry(1, 1, 1);
      const cubeMaterial = new THREE.MeshLambertMaterial({
        color: "rgb(255,0,0)",
        emissive: 2097152
      });
      cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
      cube.position.z = -1;
      scene.add(cube);
      cubeShadow = new ShadowMesh(cube);
      scene.add(cubeShadow);
      const cylinderGeometry = new THREE.CylinderGeometry(0.3, 0.3, 2);
      const cylinderMaterial = new THREE.MeshPhongMaterial({
        color: "rgb(0,0,255)",
        emissive: 32
      });
      cylinder = new THREE.Mesh(cylinderGeometry, cylinderMaterial);
      cylinder.position.z = -2.5;
      scene.add(cylinder);
      cylinderShadow = new ShadowMesh(cylinder);
      scene.add(cylinderShadow);
      const torusGeometry = new THREE.TorusGeometry(1, 0.2, 10, 16, TWO_PI);
      const torusMaterial = new THREE.MeshPhongMaterial({
        color: "rgb(255,0,255)",
        emissive: 2097184
      });
      torus = new THREE.Mesh(torusGeometry, torusMaterial);
      torus.position.z = -6;
      scene.add(torus);
      torusShadow = new ShadowMesh(torus);
      scene.add(torusShadow);
      const sphereGeometry = new THREE.SphereGeometry(0.5, 20, 10);
      const sphereMaterial = new THREE.MeshPhongMaterial({
        color: "rgb(255,255,255)",
        emissive: 2236962
      });
      sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);
      sphere.position.set(4, 0.5, 2);
      scene.add(sphere);
      sphereShadow = new ShadowMesh(sphere);
      scene.add(sphereShadow);
      const pyramidGeometry = new THREE.CylinderGeometry(0, 0.5, 2, 4);
      const pyramidMaterial = new THREE.MeshPhongMaterial({
        color: "rgb(255,255,0)",
        emissive: 4456448,
        flatShading: true,
        shininess: 0
      });
      pyramid = new THREE.Mesh(pyramidGeometry, pyramidMaterial);
      pyramid.position.set(-4, 1, 2);
      scene.add(pyramid);
      pyramidShadow = new ShadowMesh(pyramid);
      scene.add(pyramidShadow);
      const gui = new GUI();
      gui.add(
        {
          lightButtonHandler
        },
        "lightButtonHandler"
      ).name("Switch Light");
      needToDispose(renderer, scene);
    }
    function animate() {
      frameTime = clock.getDelta();
      cube.rotation.x += 1 * frameTime;
      cube.rotation.y += 1 * frameTime;
      cylinder.rotation.y += 1 * frameTime;
      cylinder.rotation.z -= 1 * frameTime;
      torus.rotation.x -= 1 * frameTime;
      torus.rotation.y -= 1 * frameTime;
      pyramid.rotation.y += 0.5 * frameTime;
      horizontalAngle += 0.5 * frameTime;
      if (horizontalAngle > TWO_PI) horizontalAngle -= TWO_PI;
      cube.position.x = Math.sin(horizontalAngle) * 4;
      cylinder.position.x = Math.sin(horizontalAngle) * -4;
      torus.position.x = Math.cos(horizontalAngle) * 4;
      verticalAngle += 1.5 * frameTime;
      if (verticalAngle > TWO_PI) verticalAngle -= TWO_PI;
      cube.position.y = Math.sin(verticalAngle) * 2 + 2.9;
      cylinder.position.y = Math.sin(verticalAngle) * 2 + 3.1;
      torus.position.y = Math.cos(verticalAngle) * 2 + 3.3;
      cubeShadow.update(groundPlane, lightPosition4D);
      cylinderShadow.update(groundPlane, lightPosition4D);
      torusShadow.update(groundPlane, lightPosition4D);
      sphereShadow.update(groundPlane, lightPosition4D);
      pyramidShadow.update(groundPlane, lightPosition4D);
      renderer.render(scene, camera);
    }
    function onWindowResize() {
      SCREEN_WIDTH = window.innerWidth;
      SCREEN_HEIGHT = window.innerHeight;
      renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
      camera.aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
      camera.updateProjectionMatrix();
    }
    function lightButtonHandler() {
      useDirectionalLight = !useDirectionalLight;
      if (useDirectionalLight) {
        scene.background.setHex(38655);
        groundMesh.material.color.setHex(33280);
        sunLight.position.set(5, 7, -1);
        sunLight.lookAt(scene.position);
        lightPosition4D.x = sunLight.position.x;
        lightPosition4D.y = sunLight.position.y;
        lightPosition4D.z = sunLight.position.z;
        lightPosition4D.w = 1e-3;
        arrowHelper1.visible = true;
        arrowHelper2.visible = true;
        arrowHelper3.visible = true;
        lightSphere.visible = false;
        lightHolder.visible = false;
      } else {
        scene.background.setHex(0);
        groundMesh.material.color.setHex(9868950);
        sunLight.position.set(0, 6, -2);
        sunLight.lookAt(scene.position);
        lightSphere.position.copy(sunLight.position);
        lightHolder.position.copy(lightSphere.position);
        lightHolder.position.y += 0.12;
        lightPosition4D.x = sunLight.position.x;
        lightPosition4D.y = sunLight.position.y;
        lightPosition4D.z = sunLight.position.z;
        lightPosition4D.w = 0.9;
        arrowHelper1.visible = false;
        arrowHelper2.visible = false;
        arrowHelper3.visible = false;
        lightSphere.visible = true;
        lightHolder.visible = true;
      }
    }
  }
};
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_shadowmesh ​

webgl_shadowmesh