webgl_loader_nrrd

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 { TrackballControls } from "three/examples/jsm/controls/TrackballControls.js";
import { NRRDLoader } from "three/examples/jsm/loaders/NRRDLoader.js";
import { VTKLoader } from "three/examples/jsm/loaders/VTKLoader.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_loader_nrrd",
  useLoaders: [NRRDLoader, VTKLoader],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- NRRD format loader test"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let stats, camera, controls, scene, renderer;
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.01, 1e10);
      camera.position.z = 300;
      scene = new THREE.Scene();
      scene.add(camera);
      const hemiLight = new THREE.HemisphereLight(16777215, 0, 3);
      scene.add(hemiLight);
      const dirLight = new THREE.DirectionalLight(16777215, 1.5);
      dirLight.position.set(200, 200, 200);
      scene.add(dirLight);
      const loader = new NRRDLoader();
      loader.load("models/nrrd/I.nrrd", function(volume) {
        const geometry = new THREE.BoxGeometry(volume.xLength, volume.yLength, volume.zLength);
        const material = new THREE.MeshBasicMaterial({ color: 65280 });
        const cube = new THREE.Mesh(geometry, material);
        cube.visible = false;
        const box = new THREE.BoxHelper(cube);
        scene.add(box);
        box.applyMatrix4(volume.matrix);
        scene.add(cube);
        const sliceZ = volume.extractSlice("z", Math.floor(volume.RASDimensions[2] / 4));
        scene.add(sliceZ.mesh);
        const sliceY = volume.extractSlice("y", Math.floor(volume.RASDimensions[1] / 2));
        scene.add(sliceY.mesh);
        const sliceX = volume.extractSlice("x", Math.floor(volume.RASDimensions[0] / 2));
        scene.add(sliceX.mesh);
        gui.add(sliceX, "index", 0, volume.RASDimensions[0], 1).name("indexX").onChange(function() {
          sliceX.repaint.call(sliceX);
        });
        gui.add(sliceY, "index", 0, volume.RASDimensions[1], 1).name("indexY").onChange(function() {
          sliceY.repaint.call(sliceY);
        });
        gui.add(sliceZ, "index", 0, volume.RASDimensions[2], 1).name("indexZ").onChange(function() {
          sliceZ.repaint.call(sliceZ);
        });
        gui.add(volume, "lowerThreshold", volume.min, volume.max, 1).name("Lower Threshold").onChange(function() {
          volume.repaintAllSlices();
        });
        gui.add(volume, "upperThreshold", volume.min, volume.max, 1).name("Upper Threshold").onChange(function() {
          volume.repaintAllSlices();
        });
        gui.add(volume, "windowLow", volume.min, volume.max, 1).name("Window Low").onChange(function() {
          volume.repaintAllSlices();
        });
        gui.add(volume, "windowHigh", volume.min, volume.max, 1).name("Window High").onChange(function() {
          volume.repaintAllSlices();
        });
      });
      const vtkmaterial = new THREE.MeshLambertMaterial({
        wireframe: false,
        side: THREE.DoubleSide,
        color: 16711680
      });
      const vtkloader = new VTKLoader();
      vtkloader.load("models/vtk/liver.vtk", function(geometry) {
        geometry.computeVertexNormals();
        const mesh = new THREE.Mesh(geometry, vtkmaterial);
        scene.add(mesh);
        const visibilityControl = {
          visible: true
        };
        gui.add(visibilityControl, "visible").name("Model Visible").onChange(function() {
          mesh.visible = visibilityControl.visible;
          renderer.render(scene, camera);
        });
      });
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      controls = new TrackballControls(camera, renderer.domElement);
      controls.minDistance = 100;
      controls.maxDistance = 500;
      controls.rotateSpeed = 5;
      controls.zoomSpeed = 5;
      controls.panSpeed = 2;
      stats = new Stats(renderer);
      const gui = new GUI();
      window.addEventListener("resize", onWindowResize);
      needToDispose(renderer, loader, scene, controls, vtkloader);
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
      controls.handleResize();
    }
    function animate() {
      controls.update();
      renderer.render(scene, camera);
      stats.update();
    }
  }
};
export {
  exampleInfo as default
};

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 {
  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: Record<string, 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_loader_nrrd ​

webgl_loader_nrrd