webgl_geometry_nurbs

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 { NURBSCurve } from "three/examples/jsm/curves/NURBSCurve.js";
import { NURBSSurface } from "three/examples/jsm/curves/NURBSSurface.js";
import { NURBSVolume } from "three/examples/jsm/curves/NURBSVolume.js";
import { ParametricGeometry } from "three/examples/jsm/geometries/ParametricGeometry.js";

/** @type {import("@minisheeep/mp-three-examples").OfficialExampleInfo} */
const exampleInfo = {
  name: "webgl_geometry_nurbs",
  useLoaders: [],
  info: [
    [
      {
        tag: "a",
        link: "https://threejs.org",
        content: "three.js"
      },
      {
        tag: "text",
        content: "- NURBS curve and surface example"
      }
    ]
  ],
  init: ({ window, canvas, GUI, Stats, needToDispose, useFrame }) => {
    let stats;
    let camera, scene, renderer;
    let group;
    let targetRotation = 0;
    let targetRotationOnPointerDown = 0;
    let pointerX = 0;
    let pointerXOnPointerDown = 0;
    let windowHalfX = window.innerWidth / 2;
    init();
    function init() {
      camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 2e3);
      camera.position.set(0, 150, 750);
      scene = new THREE.Scene();
      scene.background = new THREE.Color(15790320);
      scene.add(new THREE.AmbientLight(16777215));
      const light = new THREE.DirectionalLight(16777215, 3);
      light.position.set(1, 1, 1);
      scene.add(light);
      group = new THREE.Group();
      group.position.y = 50;
      scene.add(group);
      const nurbsControlPoints = [];
      const nurbsKnots = [];
      const nurbsDegree = 3;
      for (let i = 0; i <= nurbsDegree; i++) {
        nurbsKnots.push(0);
      }
      for (let i = 0, j = 20; i < j; i++) {
        nurbsControlPoints.push(
          new THREE.Vector4(
            Math.random() * 400 - 200,
            Math.random() * 400,
            Math.random() * 400 - 200,
            1
            // weight of control point: higher means stronger attraction
          )
        );
        const knot = (i + 1) / (j - nurbsDegree);
        nurbsKnots.push(THREE.MathUtils.clamp(knot, 0, 1));
      }
      const nurbsCurve = new NURBSCurve(nurbsDegree, nurbsKnots, nurbsControlPoints);
      const nurbsGeometry = new THREE.BufferGeometry();
      nurbsGeometry.setFromPoints(nurbsCurve.getPoints(200));
      const nurbsMaterial = new THREE.LineBasicMaterial({ color: 3355443 });
      const nurbsLine = new THREE.Line(nurbsGeometry, nurbsMaterial);
      nurbsLine.position.set(0, -100, 0);
      group.add(nurbsLine);
      const nurbsControlPointsGeometry = new THREE.BufferGeometry();
      nurbsControlPointsGeometry.setFromPoints(nurbsCurve.controlPoints);
      const nurbsControlPointsMaterial = new THREE.LineBasicMaterial({
        color: 3355443,
        opacity: 0.25,
        transparent: true
      });
      const nurbsControlPointsLine = new THREE.Line(
        nurbsControlPointsGeometry,
        nurbsControlPointsMaterial
      );
      nurbsControlPointsLine.position.copy(nurbsLine.position);
      group.add(nurbsControlPointsLine);
      {
        let getSurfacePoint = function(u, v, target) {
          return nurbsSurface.getPoint(u, v, target);
        };
        const nsControlPoints = [
          [
            new THREE.Vector4(-200, -200, 100, 1),
            new THREE.Vector4(-200, -100, -200, 1),
            new THREE.Vector4(-200, 100, 250, 1),
            new THREE.Vector4(-200, 200, -100, 1)
          ],
          [
            new THREE.Vector4(0, -200, 0, 1),
            new THREE.Vector4(0, -100, -100, 5),
            new THREE.Vector4(0, 100, 150, 5),
            new THREE.Vector4(0, 200, 0, 1)
          ],
          [
            new THREE.Vector4(200, -200, -100, 1),
            new THREE.Vector4(200, -100, 200, 1),
            new THREE.Vector4(200, 100, -250, 1),
            new THREE.Vector4(200, 200, 100, 1)
          ]
        ];
        const degree1 = 2;
        const degree2 = 3;
        const knots1 = [0, 0, 0, 1, 1, 1];
        const knots2 = [0, 0, 0, 0, 1, 1, 1, 1];
        const nurbsSurface = new NURBSSurface(degree1, degree2, knots1, knots2, nsControlPoints);
        const map = new THREE.TextureLoader().load("textures/uv_grid_opengl.jpg");
        map.wrapS = map.wrapT = THREE.RepeatWrapping;
        map.anisotropy = 16;
        map.colorSpace = THREE.SRGBColorSpace;
        const geometry = new ParametricGeometry(getSurfacePoint, 20, 20);
        const material = new THREE.MeshLambertMaterial({ map, side: THREE.DoubleSide });
        const object = new THREE.Mesh(geometry, material);
        object.position.set(-400, 100, 0);
        object.scale.multiplyScalar(1);
        group.add(object);
      }
      {
        let getSurfacePointFront = function(u, v, target) {
          return nurbsVolume.getPoint(u, v, 0, target);
        }, getSurfacePointMiddle = function(u, v, target) {
          return nurbsVolume.getPoint(u, v, 0.5, target);
        }, getSurfacePointBack = function(u, v, target) {
          return nurbsVolume.getPoint(u, v, 1, target);
        }, getSurfacePointTop = function(u, w, target) {
          return nurbsVolume.getPoint(u, 1, w, target);
        }, getSurfacePointSide = function(v, w, target) {
          return nurbsVolume.getPoint(0, v, w, target);
        };
        const nsControlPoints = [
          [
            [new THREE.Vector4(-200, -200, -200, 1), new THREE.Vector4(-200, -200, 200, 1)],
            [new THREE.Vector4(-200, -100, -200, 1), new THREE.Vector4(-200, -100, 200, 1)],
            [new THREE.Vector4(-200, 100, -200, 1), new THREE.Vector4(-200, 100, 200, 1)],
            [new THREE.Vector4(-200, 200, -200, 1), new THREE.Vector4(-200, 200, 200, 1)]
          ],
          [
            [new THREE.Vector4(0, -200, -200, 1), new THREE.Vector4(0, -200, 200, 1)],
            [new THREE.Vector4(0, -100, -200, 1), new THREE.Vector4(0, -100, 200, 1)],
            [new THREE.Vector4(0, 100, -200, 1), new THREE.Vector4(0, 100, 200, 1)],
            [new THREE.Vector4(0, 200, -200, 1), new THREE.Vector4(0, 200, 200, 1)]
          ],
          [
            [new THREE.Vector4(200, -200, -200, 1), new THREE.Vector4(200, -200, 200, 1)],
            [new THREE.Vector4(200, -100, 0, 1), new THREE.Vector4(200, -100, 100, 1)],
            [new THREE.Vector4(200, 100, 0, 1), new THREE.Vector4(200, 100, 100, 1)],
            [new THREE.Vector4(200, 200, 0, 1), new THREE.Vector4(200, 200, 100, 1)]
          ]
        ];
        const degree1 = 2;
        const degree2 = 3;
        const degree3 = 1;
        const knots1 = [0, 0, 0, 1, 1, 1];
        const knots2 = [0, 0, 0, 0, 1, 1, 1, 1];
        const knots3 = [0, 0, 1, 1];
        const nurbsVolume = new NURBSVolume(
          degree1,
          degree2,
          degree3,
          knots1,
          knots2,
          knots3,
          nsControlPoints
        );
        const map = new THREE.TextureLoader().load("textures/uv_grid_opengl.jpg");
        map.wrapS = map.wrapT = THREE.RepeatWrapping;
        map.anisotropy = 16;
        map.colorSpace = THREE.SRGBColorSpace;
        const geometryFront = new ParametricGeometry(getSurfacePointFront, 20, 20);
        const materialFront = new THREE.MeshLambertMaterial({ map, side: THREE.DoubleSide });
        const objectFront = new THREE.Mesh(geometryFront, materialFront);
        objectFront.position.set(400, 100, 0);
        objectFront.scale.multiplyScalar(0.5);
        group.add(objectFront);
        const geometryMiddle = new ParametricGeometry(getSurfacePointMiddle, 20, 20);
        const materialMiddle = new THREE.MeshLambertMaterial({ map, side: THREE.DoubleSide });
        const objectMiddle = new THREE.Mesh(geometryMiddle, materialMiddle);
        objectMiddle.position.set(400, 100, 0);
        objectMiddle.scale.multiplyScalar(0.5);
        group.add(objectMiddle);
        const geometryBack = new ParametricGeometry(getSurfacePointBack, 20, 20);
        const materialBack = new THREE.MeshLambertMaterial({ map, side: THREE.DoubleSide });
        const objectBack = new THREE.Mesh(geometryBack, materialBack);
        objectBack.position.set(400, 100, 0);
        objectBack.scale.multiplyScalar(0.5);
        group.add(objectBack);
        const geometryTop = new ParametricGeometry(getSurfacePointTop, 20, 20);
        const materialTop = new THREE.MeshLambertMaterial({ map, side: THREE.DoubleSide });
        const objectTop = new THREE.Mesh(geometryTop, materialTop);
        objectTop.position.set(400, 100, 0);
        objectTop.scale.multiplyScalar(0.5);
        group.add(objectTop);
        const geometrySide = new ParametricGeometry(getSurfacePointSide, 20, 20);
        const materialSide = new THREE.MeshLambertMaterial({ map, side: THREE.DoubleSide });
        const objectSide = new THREE.Mesh(geometrySide, materialSide);
        objectSide.position.set(400, 100, 0);
        objectSide.scale.multiplyScalar(0.5);
        group.add(objectSide);
      }
      renderer = new THREE.WebGLRenderer({ antialias: true, canvas });
      renderer.setPixelRatio(window.devicePixelRatio);
      renderer.setSize(window.innerWidth, window.innerHeight);
      renderer.setAnimationLoop(animate);
      stats = new Stats(renderer);
      canvas.addEventListener("pointerdown", onPointerDown);
      window.addEventListener("resize", onWindowResize);
      needToDispose(renderer, scene);
    }
    function onWindowResize() {
      windowHalfX = window.innerWidth / 2;
      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();
      renderer.setSize(window.innerWidth, window.innerHeight);
    }
    function onPointerDown(event) {
      if (event.isPrimary === false) return;
      pointerXOnPointerDown = event.clientX - windowHalfX;
      targetRotationOnPointerDown = targetRotation;
      canvas.addEventListener("pointermove", onPointerMove);
      canvas.addEventListener("pointerup", onPointerUp);
    }
    function onPointerMove(event) {
      if (event.isPrimary === false) return;
      pointerX = event.clientX - windowHalfX;
      targetRotation = targetRotationOnPointerDown + (pointerX - pointerXOnPointerDown) * 0.02;
    }
    function onPointerUp(event) {
      if (event.isPrimary === false) return;
      canvas.removeEventListener("pointermove", onPointerMove);
      canvas.removeEventListener("pointerup", onPointerUp);
    }
    function animate() {
      render();
      stats.update();
    }
    function render() {
      group.rotation.y += (targetRotation - group.rotation.y) * 0.05;
      renderer.render(scene, camera);
    }
  }
};
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_geometry_nurbs ​

webgl_geometry_nurbs