three.js版本135自定义索引带uv贴图buffergeometry代码示例

Three.js Custom BufferGeometry using TypedArrays

three, geometry, example

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JavaScript

import * as THREE from 'https://cdn.skypack.dev/three@0.135.0';

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 = 100;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.z = 5;

const scene = new THREE.Scene();

{
    const color = 0xFFFFFF;
    const intensity = 1;
    const light = new THREE.DirectionalLight(color, intensity);
    light.position.set(-1, 2, 4);
    scene.add(light);
  }

// NOT A GOOD EXAMPLE OF HOW TO MAKE A CUBE!
  // Only trying to make it clear most vertices are unique
  const vertices = [
    // front
    { pos: [-1, -1,  1], norm: [ 0,  0,  1], uv: [0, 0], }, // 0
    { pos: [ 1, -1,  1], norm: [ 0,  0,  1], uv: [1, 0], }, // 1
    { pos: [-1,  1,  1], norm: [ 0,  0,  1], uv: [0, 1], }, // 2
    { pos: [ 1,  1,  1], norm: [ 0,  0,  1], uv: [1, 1], }, // 3
    // right
    { pos: [ 1, -1,  1], norm: [ 1,  0,  0], uv: [0, 0], }, // 4
    { pos: [ 1, -1, -1], norm: [ 1,  0,  0], uv: [1, 0], }, // 5
    { pos: [ 1,  1,  1], norm: [ 1,  0,  0], uv: [0, 1], }, // 6
    { pos: [ 1,  1, -1], norm: [ 1,  0,  0], uv: [1, 1], }, // 7
    // back
    { pos: [ 1, -1, -1], norm: [ 0,  0, -1], uv: [0, 0], }, // 8
    { pos: [-1, -1, -1], norm: [ 0,  0, -1], uv: [1, 0], }, // 9
    { pos: [ 1,  1, -1], norm: [ 0,  0, -1], uv: [0, 1], }, // 10
    { pos: [-1,  1, -1], norm: [ 0,  0, -1], uv: [1, 1], }, // 11
    // left
    { pos: [-1, -1, -1], norm: [-1,  0,  0], uv: [0, 0], }, // 12
    { pos: [-1, -1,  1], norm: [-1,  0,  0], uv: [1, 0], }, // 13
    { pos: [-1,  1, -1], norm: [-1,  0,  0], uv: [0, 1], }, // 14
    { pos: [-1,  1,  1], norm: [-1,  0,  0], uv: [1, 1], }, // 15
    // top
    { pos: [ 1,  1, -1], norm: [ 0,  1,  0], uv: [0, 0], }, // 16
    { pos: [-1,  1, -1], norm: [ 0,  1,  0], uv: [1, 0], }, // 17
    { pos: [ 1,  1,  1], norm: [ 0,  1,  0], uv: [0, 1], }, // 18
    { pos: [-1,  1,  1], norm: [ 0,  1,  0], uv: [1, 1], }, // 19
    // bottom
    { pos: [ 1, -1,  1], norm: [ 0, -1,  0], uv: [0, 0], }, // 20
    { pos: [-1, -1,  1], norm: [ 0, -1,  0], uv: [1, 0], }, // 21
    { pos: [ 1, -1, -1], norm: [ 0, -1,  0], uv: [0, 1], }, // 22
    { pos: [-1, -1, -1], norm: [ 0, -1,  0], uv: [1, 1], }, // 23
  ];
  const numVertices = vertices.length;
  const positionNumComponents = 3;
  const normalNumComponents = 3;
  const uvNumComponents = 2;
  const positions = new Float32Array(numVertices * positionNumComponents);
  const normals = new Float32Array(numVertices * normalNumComponents);
  const uvs = new Float32Array(numVertices * uvNumComponents);
  let posNdx = 0;
  let nrmNdx = 0;
  let uvNdx = 0;
  for (const vertex of vertices) {
    positions.set(vertex.pos, posNdx);
    normals.set(vertex.norm, nrmNdx);
    uvs.set(vertex.uv, uvNdx);
    posNdx += positionNumComponents;
    nrmNdx += normalNumComponents;
    uvNdx += uvNumComponents;
  }

const geometry = new THREE.BufferGeometry();
  geometry.setAttribute(
      'position',
      new THREE.BufferAttribute(positions, positionNumComponents));
  geometry.setAttribute(
      'normal',
      new THREE.BufferAttribute(normals, normalNumComponents));
  geometry.setAttribute(
      'uv',
      new THREE.BufferAttribute(uvs, uvNumComponents));

geometry.setIndex([
     0,  1,  2,   2,  1,  3,  // front
     4,  5,  6,   6,  5,  7,  // right
     8,  9, 10,  10,  9, 11,  // back
    12, 13, 14,  14, 13, 15,  // left
    16, 17, 18,  18, 17, 19,  // top
    20, 21, 22,  22, 21, 23,  // bottom
  ]);

const loader = new THREE.TextureLoader();
  const texture = loader.load('/uploads/2103/tree.png');

function makeInstance(geometry, color, x) {
    const material = new THREE.MeshPhongMaterial({color, map: texture});

const cube = new THREE.Mesh(geometry, material);
    scene.add(cube);

cube.position.x = x;
    return cube;
  }

const cubes = [
    makeInstance(geometry, 0x88FF88,  0),
    makeInstance(geometry, 0x8888FF, -4),
    makeInstance(geometry, 0xFF8888,  4),
  ];

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 = 1 + ndx * .1;
      const rot = time * speed;
      cube.rotation.x = rot;
      cube.rotation.y = rot;
    });

renderer.render(scene, camera);

requestAnimationFrame(render);
  }

requestAnimationFrame(render);
}

main();

编译

CSS

HTML

Three.js Custom BufferGeometry using TypedArrays

three, geometry, example

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Three.js Custom BufferGeometry using TypedArrays

three, geometry, example

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