webgl_geometry_spline_editor

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 { TransformControls } from "three/examples/jsm/controls/TransformControls.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_geometry_spline_editor",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- geometry - catmull spline editor"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let camera, scene, renderer;
    const splineHelperObjects = [];
    let splinePointsLength = 4;
    const positions = [];
    const point = new THREE.Vector3();
    const raycaster = new THREE.Raycaster();
    const pointer = new THREE.Vector2();
    const onUpPosition = new THREE.Vector2();
    const onDownPosition = new THREE.Vector2();
    const geometry = new THREE.BoxGeometry(20, 20, 20);
    let transformControl;
    const ARC_SEGMENTS = 200;
    const splines = {};
    const params = {
      uniform: true,
      tension: 0.5,
      centripetal: true,
      chordal: true,
      addPoint,
      removePoint,
      exportSpline
    };
    init();
    function init() {
      scene = new THREE.Scene();
      scene.background = new THREE.Color(15790320);
      camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 1, 1e4);
      camera.position.set(0, 250, 1e3);
      scene.add(camera);
      scene.add(new THREE.AmbientLight(15790320, 3));
      const light = new THREE.SpotLight(16777215, 4.5);
      light.position.set(0, 1500, 200);
      light.angle = Math.PI * 0.2;
      light.decay = 0;
      light.castShadow = true;
      light.shadow.camera.near = 200;
      light.shadow.camera.far = 2e3;
      light.shadow.bias = -222e-6;
      light.shadow.mapSize.width = 1024;
      light.shadow.mapSize.height = 1024;
      scene.add(light);
      const planeGeometry = new THREE.PlaneGeometry(2e3, 2e3);
      planeGeometry.rotateX(-Math.PI / 2);
      const planeMaterial = new THREE.ShadowMaterial({ color: 0, opacity: 0.2 });
      const plane = new THREE.Mesh(planeGeometry, planeMaterial);
      plane.position.y = -200;
      plane.receiveShadow = true;
      scene.add(plane);
      const helper = new THREE.GridHelper(2e3, 100);
      helper.position.y = -199;
      helper.material.opacity = 0.25;
      helper.material.transparent = true;
      scene.add(helper);
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.shadowMap.enabled = true;
      const gui = new GUI();
      gui.add(params, "uniform").onChange(render);
      gui.add(params, "tension", 0, 1).step(0.01).onChange(function(value) {
        splines.uniform.tension = value;
        updateSplineOutline();
        render();
      });
      gui.add(params, "centripetal").onChange(render);
      gui.add(params, "chordal").onChange(render);
      gui.add(params, "addPoint");
      gui.add(params, "removePoint");
      gui.add(params, "exportSpline");
      gui.open();
      const controls = new OrbitControls(camera, renderer.domElement);
      controls.damping = 0.2;
      controls.addEventListener("change", render);
      transformControl = new TransformControls(camera, renderer.domElement);
      transformControl.addEventListener("change", render);
      transformControl.addEventListener("dragging-changed", function(event) {
        controls.enabled = !event.value;
      });
      if (transformControl.isObject3D) {
        scene.add(transformControl);
      } else {
        const gizmo = transformControl.getHelper();
        scene.add(gizmo);
      }
      transformControl.addEventListener("objectChange", function() {
        updateSplineOutline();
      });
      canvas.addEventListener("pointerdown", onPointerDown);
      canvas.addEventListener("pointerup", onPointerUp);
      canvas.addEventListener("pointermove", onPointerMove);
      window.addEventListener("resize", onWindowResize);
      for (let i = 0; i < splinePointsLength; i++) {
        addSplineObject(positions[i]);
      }
      positions.length = 0;
      for (let i = 0; i < splinePointsLength; i++) {
        positions.push(splineHelperObjects[i].position);
      }
      const geometry2 = new THREE.BufferGeometry();
      geometry2.setAttribute(
        "position",
        new THREE.BufferAttribute(new Float32Array(ARC_SEGMENTS * 3), 3)
      );
      let curve = new THREE.CatmullRomCurve3(positions);
      curve.curveType = "catmullrom";
      curve.mesh = new THREE.Line(
        geometry2.clone(),
        new THREE.LineBasicMaterial({
          color: 16711680,
          opacity: 0.35
        })
      );
      curve.mesh.castShadow = true;
      splines.uniform = curve;
      curve = new THREE.CatmullRomCurve3(positions);
      curve.curveType = "centripetal";
      curve.mesh = new THREE.Line(
        geometry2.clone(),
        new THREE.LineBasicMaterial({
          color: 65280,
          opacity: 0.35
        })
      );
      curve.mesh.castShadow = true;
      splines.centripetal = curve;
      curve = new THREE.CatmullRomCurve3(positions);
      curve.curveType = "chordal";
      curve.mesh = new THREE.Line(
        geometry2.clone(),
        new THREE.LineBasicMaterial({
          color: 255,
          opacity: 0.35
        })
      );
      curve.mesh.castShadow = true;
      splines.chordal = curve;
      for (const k in splines) {
        const spline = splines[k];
        scene.add(spline.mesh);
      }
      load([
        new THREE.Vector3(289.76843686945404, 452.51481137238443, 56.10018915737797),
        new THREE.Vector3(-53.56300074753207, 171.49711742836848, -14.495472686253045),
        new THREE.Vector3(-91.40118730204415, 176.4306956436485, -6.958271935582161),
        new THREE.Vector3(-383.785318791128, 491.1365363371675, 47.869296953772746)
      ]);
      render();
      needToDispose(renderer, scene, controls);
    }
    function addSplineObject(position) {
      const material = new THREE.MeshLambertMaterial({ color: Math.random() * 16777215 });
      const object = new THREE.Mesh(geometry, material);
      if (position) {
        object.position.copy(position);
      } else {
        object.position.x = Math.random() * 1e3 - 500;
        object.position.y = Math.random() * 600;
        object.position.z = Math.random() * 800 - 400;
      }
      object.castShadow = true;
      object.receiveShadow = true;
      scene.add(object);
      splineHelperObjects.push(object);
      return object;
    }
    function addPoint() {
      splinePointsLength++;
      positions.push(addSplineObject().position);
      updateSplineOutline();
      render();
    }
    function removePoint() {
      if (splinePointsLength <= 4) {
        return;
      }
      const point2 = splineHelperObjects.pop();
      splinePointsLength--;
      positions.pop();
      if (transformControl.object === point2) transformControl.detach();
      scene.remove(point2);
      updateSplineOutline();
      render();
    }
    function updateSplineOutline() {
      for (const k in splines) {
        const spline = splines[k];
        const splineMesh = spline.mesh;
        const position = splineMesh.geometry.attributes.position;
        for (let i = 0; i < ARC_SEGMENTS; i++) {
          const t = i / (ARC_SEGMENTS - 1);
          spline.getPoint(t, point);
          position.setXYZ(i, point.x, point.y, point.z);
        }
        position.needsUpdate = true;
      }
    }
    function exportSpline() {
      const strplace = [];
      for (let i = 0; i < splinePointsLength; i++) {
        const p = splineHelperObjects[i].position;
        strplace.push(`new THREE.Vector3(${p.x}, ${p.y}, ${p.z})`);
      }
      console.log(strplace.join(",\n"));
      const code = "[" + strplace.join(",\n	") + "]";
      console.log("copy and paste code", code);
    }
    function load(new_positions) {
      while (new_positions.length > positions.length) {
        addPoint();
      }
      while (new_positions.length < positions.length) {
        removePoint();
      }
      for (let i = 0; i < positions.length; i++) {
        positions[i].copy(new_positions[i]);
      }
      updateSplineOutline();
    }
    function render() {
      splines.uniform.mesh.visible = params.uniform;
      splines.centripetal.mesh.visible = params.centripetal;
      splines.chordal.mesh.visible = params.chordal;
      renderer.render(scene, camera);
    }
    function onPointerDown(event) {
      onDownPosition.x = event.clientX;
      onDownPosition.y = event.clientY;
    }
    function onPointerUp(event) {
      onUpPosition.x = event.clientX;
      onUpPosition.y = event.clientY;
      if (onDownPosition.distanceTo(onUpPosition) === 0) {
        transformControl.detach();
        render();
      }
    }
    function onPointerMove(event) {
      pointer.x = event.clientX / window.innerWidth * 2 - 1;
      pointer.y = -(event.clientY / window.innerHeight) * 2 + 1;
      raycaster.setFromCamera(pointer, camera);
      const intersects = raycaster.intersectObjects(splineHelperObjects, false);
      if (intersects.length > 0) {
        const object = intersects[0].object;
        if (object !== transformControl.object) {
          transformControl.attach(object);
        }
      }
    }
    function onWindowResize() {
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
      render();
    }
  }
};
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;