webgl_geometry_csg

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 { Evaluator, Brush, SUBTRACTION, ADDITION, INTERSECTION } from "three-bvh-csg";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_geometry_csg",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "bvh csg  -"
      },
      {
        tag: "a",
        link: "https://github.com/gkjohnson/three-bvh-csg",
        content: "three-bvh-csg"
      }
    ],
    [
      {
        tag: "text",
        content: "See"
      },
      {
        tag: "a",
        link: "https://github.com/gkjohnson/three-bvh-csg",
        content: "main project repository"
      },
      {
        tag: "text",
        content: "for more information and examples on constructive solid geometry."
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let stats;
    let camera, scene, renderer;
    let baseBrush, brush;
    let core;
    let result, evaluator, wireframe;
    const params = {
      operation: SUBTRACTION,
      useGroups: true,
      wireframe: false
    };
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 100);
      camera.position.set(-1, 1, 1).normalize().multiplyScalar(10);
      scene = new THREE.Scene();
      scene.background = new THREE.Color(16573676);
      const ambient = new THREE.HemisphereLight(16777215, 12571858, 3);
      scene.add(ambient);
      const directionalLight = new THREE.DirectionalLight(16777215, 0.3);
      directionalLight.position.set(1, 4, 3).multiplyScalar(3);
      directionalLight.castShadow = true;
      directionalLight.shadow.mapSize.setScalar(2048);
      directionalLight.shadow.bias = -1e-4;
      directionalLight.shadow.normalBias = 1e-4;
      scene.add(directionalLight);
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      renderer.shadowMap.enabled = true;
      renderer.shadowMap.type = THREE.PCFSoftShadowMap;
      stats = new Stats(renderer);
      const plane = new THREE.Mesh(
        new THREE.PlaneGeometry(),
        new THREE.ShadowMaterial({
          color: 14162784,
          transparent: true,
          opacity: 0.075,
          side: THREE.DoubleSide
        })
      );
      plane.position.y = -3;
      plane.rotation.x = -Math.PI / 2;
      plane.scale.setScalar(10);
      plane.receiveShadow = true;
      scene.add(plane);
      evaluator = new Evaluator();
      baseBrush = new Brush(
        new THREE.IcosahedronGeometry(2, 3),
        new THREE.MeshStandardMaterial({
          flatShading: true,
          polygonOffset: true,
          polygonOffsetUnits: 1,
          polygonOffsetFactor: 1
        })
      );
      brush = new Brush(
        new THREE.CylinderGeometry(1, 1, 5, 45),
        new THREE.MeshStandardMaterial({
          color: 8440772,
          polygonOffset: true,
          polygonOffsetUnits: 1,
          polygonOffsetFactor: 1
        })
      );
      core = new Brush(
        new THREE.IcosahedronGeometry(0.15, 1),
        new THREE.MeshStandardMaterial({
          flatShading: true,
          color: 16750592,
          emissive: 16750592,
          emissiveIntensity: 0.35,
          polygonOffset: true,
          polygonOffsetUnits: 1,
          polygonOffsetFactor: 1
        })
      );
      core.castShadow = true;
      scene.add(core);
      wireframe = new THREE.Mesh(
        void 0,
        new THREE.MeshBasicMaterial({ color: 38536, wireframe: true })
      );
      scene.add(wireframe);
      const controls = new OrbitControls(camera, renderer.domElement);
      controls.minDistance = 5;
      controls.maxDistance = 75;
      const gui = new GUI();
      gui.add(params, "operation", { SUBTRACTION, INTERSECTION, ADDITION });
      gui.add(params, "wireframe");
      gui.add(params, "useGroups");
      window.addEventListener("resize", onWindowResize);
      onWindowResize();
      needToDispose(renderer, scene, controls);
    }
    function updateCSG() {
      evaluator.useGroups = params.useGroups;
      result = evaluator.evaluate(baseBrush, brush, params.operation, result);
      result.castShadow = true;
      result.receiveShadow = true;
      scene.add(result);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    const startTime = Date.now();
    function animate() {
      const t = Date.now() - startTime + 9e3;
      baseBrush.rotation.x = t * 1e-4;
      baseBrush.rotation.y = t * 25e-5;
      baseBrush.rotation.z = t * 5e-4;
      baseBrush.updateMatrixWorld();
      brush.rotation.x = t * -2e-4;
      brush.rotation.y = t * -5e-4;
      brush.rotation.z = t * -1e-3;
      const s = 0.5 + 0.5 * (1 + Math.sin(t * 1e-3));
      brush.scale.set(s, 1, s);
      brush.updateMatrixWorld();
      updateCSG();
      wireframe.geometry = result.geometry;
      wireframe.visible = params.wireframe;
      renderer.render(scene, camera);
      stats.update();
    }
  }
};
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;