three完全开源扩展案例01-三角形渐变

演示地址

import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'

const box = document.getElementById('box')

const scene = new THREE.Scene()

const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 1000)

camera.position.set(0, 0, 500)

const renderer = new THREE.WebGLRenderer()

renderer.setSize(box.clientWidth, box.clientHeight)

new OrbitControls(camera, renderer.domElement)

window.onresize = () => {

  renderer.setSize(box.clientWidth, box.clientHeight)

  camera.aspect = box.clientWidth / box.clientHeight

  camera.updateProjectionMatrix()

}

box.appendChild(renderer.domElement)

initObject();
function initObject() {
  let geometry = new THREE.BufferGeometry(); // 使用BufferGeometry

  let vertices = new Float32Array([
    0, 0, 0, // 顶点p1
    0, 200, 0, // 顶点p2
    200, 0, 0 // 顶点p3
  ]);

  geometry.setAttribute('position', new THREE.BufferAttribute(vertices, 3));

  let colors = [
    1.0, 0.0, 0.0, // 颜色1 (红色)
    0.0, 1.0, 0.0, // 颜色2 (绿色)
    0.0, 0.0, 1.0  // 颜色3 (蓝色)
  ];

  // 创建顶点颜色属性
  let colorAttribute = new THREE.BufferAttribute(new Float32Array(colors), 3);
  geometry.setAttribute('color', colorAttribute);

  // 定义索引，创建三角形面
  let indices = [
    0, 1, 2 // 索引0, 1, 2 表示顶点数组中的p1, p2, p3
  ];
  let indexAttribute = new THREE.BufferAttribute(new Uint16Array(indices), 1);
  geometry.setIndex(indexAttribute);

  let material = new THREE.MeshBasicMaterial({
    vertexColors: true,
    side: THREE.DoubleSide,
    wireframe: false
  });

  let obj = new THREE.Mesh(geometry, material);
  scene.add(obj);
}
function animate() {

  requestAnimationFrame(animate)
  renderer.render(scene, camera)

}

animate()

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