threejs实例（三）

纹理一般是指我们常见的在一些第三方程序中创建的图像，如Photoshop或GIMP。需要做的就是创建一个TextureLoader。调用它的load方法，同时传入图像的URL，并将材质的 map 属性设置为该方法的返回值，而不是设置它的 color属性。注意，使用的是 MeshBasicMaterial， 所以没有必要增加。但需要注意的是，并不是所有的几何体类型都支持多种材质。BoxGeometry 和 BoxGeometry 可以使用6种材料，每个面一个。ConeGeometry 和 ConeGeometry 可以使用2种材料，一种用于底部，一种用于侧面。

纹理演示

import * as THREE from 'three';
import {GUI} from 'three/addons/libs/lil-gui.module.min.js';

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});

  const fov = 75;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 5;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.z = 2;

  const scene = new THREE.Scene();

  const boxWidth = 1;
  const boxHeight = 1;
  const boxDepth = 1;
  const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);

  const cubes = [];  // just an array we can use to rotate the cubes
  const loader = new THREE.TextureLoader();

  const texture = loader.load('https://threejs.org/manual/examples/resources/images/wall.jpg');
  const material = new THREE.MeshBasicMaterial({
    map: texture,
  });
  const cube = new THREE.Mesh(geometry, material);
  scene.add(cube);
  cubes.push(cube);  // add to our list of cubes to rotate

  class DegRadHelper {
    constructor(obj, prop) {
      this.obj = obj;
      this.prop = prop;
    }
    get value() {
      return THREE.MathUtils.radToDeg(this.obj[this.prop]);
    }
    set value(v) {
      this.obj[this.prop] = THREE.MathUtils.degToRad(v);
    }
  }

  class StringToNumberHelper {
    constructor(obj, prop) {
      this.obj = obj;
      this.prop = prop;
    }
    get value() {
      return this.obj[this.prop];
    }
    set value(v) {
      this.obj[this.prop] = parseFloat(v);
    }
  }

  const wrapModes = {
    'ClampToEdgeWrapping': THREE.ClampToEdgeWrapping,
    'RepeatWrapping': THREE.RepeatWrapping,
    'MirroredRepeatWrapping': THREE.MirroredRepeatWrapping,
  };

  function updateTexture() {
    texture.needsUpdate = true;
  }

  const gui = new GUI();
  gui.add(new StringToNumberHelper(texture, 'wrapS'), 'value', wrapModes)
    .name('texture.wrapS')
    .onChange(updateTexture);
  gui.add(new StringToNumberHelper(texture, 'wrapT'), 'value', wrapModes)
    .name('texture.wrapT')
    .onChange(updateTexture);
  gui.add(texture.repeat, 'x', 0, 5, .01).name('texture.repeat.x');
  gui.add(texture.repeat, 'y', 0, 5, .01).name('texture.repeat.y');
  gui.add(texture.offset, 'x', -2, 2, .01).name('texture.offset.x');
  gui.add(texture.offset, 'y', -2, 2, .01).name('texture.offset.y');
  gui.add(texture.center, 'x', -.5, 1.5, .01).name('texture.center.x');
  gui.add(texture.center, 'y', -.5, 1.5, .01).name('texture.center.y');
  gui.add(new DegRadHelper(texture, 'rotation'), 'value', -360, 360)
    .name('texture.rotation');

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function render(time) {
    time *= 0.001;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    cubes.forEach((cube, ndx) => {
      const speed = .2 + ndx * .1;
      const rot = time * speed;
      cube.rotation.x = rot;
      cube.rotation.y = rot;
    });

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();

材质演示

const material = new THREE.MeshPhongMaterial({
  color: 0xFF0000,    // 红色 (也可以使用CSS的颜色字符串)
  flatShading: true,
});

const material = new THREE.MeshPhongMaterial();
material.color.setHSL(0, 1, .5);  // 红色
material.flatShading = true;

material.color.set(0x00FFFF);    // 同 CSS的 #RRGGBB 风格
material.color.set(cssString);   // 任何 CSS 颜色字符串, 比如 'purple', '#F32',
                                 // 'rgb(255, 127, 64)',
                                 // 'hsl(180, 50%, 25%)'
material.color.set(someColor)    // 其他一些 THREE.Color
material.color.setHSL(h, s, l)   // 其中 h, s, 和 l 从 0 到 1
material.color.setRGB(r, g, b)   // 其中 r, g, 和 b 从 0 到 1

const m1 = new THREE.MeshBasicMaterial({color: 0xFF0000});         // 红色
const m2 = new THREE.MeshBasicMaterial({color: 'red'});            // 红色
const m3 = new THREE.MeshBasicMaterial({color: '#F00'});           // 红色
const m4 = new THREE.MeshBasicMaterial({color: 'rgb(255,0,0)'});   // 红色
const m5 = new THREE.MeshBasicMaterial({color: 'hsl(0,100%,50%)'}); // 红色