一、uv坐标

相当于x、y轴，通过自定义uv坐标可以截取所需的纹理范围

javascript"><template><div id="container"></div>
</template><script setup>
import * as THREE from "three";
import { onMounted } from "vue";
import { OrbitControls } from "three/addons/controls/OrbitControls.js";// 场景
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x666666);// 相机
const camera = new THREE.PerspectiveCamera();
// camera.position.x = 10;
camera.position.y = 0;
camera.position.z = 2;// 创建矩形
const geometry = new THREE.PlaneGeometry(1, 1)
const texture = new THREE.TextureLoader().load('/textureMsg/cloud.jpeg') // 纹理贴图// UV像素的取值范围 分别为四个顶点的坐标 左上 右上 左下 右下
const uv = new Float32Array([0, 1,1, 1,0, 0,1, 0
])// UV像素的颜色值
// const colors = new Float32Array([
//   1.0, 0.0, 0.0, // 红色
//   0.0, 1.0, 0.0, // 绿色
//   0.0, 0.0, 1.0  // 蓝色
// ]);// const colorAttribute = new THREE.BufferAttribute(colors, 3); // 每个颜色有3个分量 (r, g, b)
// geometry.setAttribute('color', colorAttribute);// // 设置矩形的uv 
geometry.attributes.uv = new THREE.BufferAttribute(uv, 2) // uv坐标 2表示只有x,y  3是x,y,z// 材质
const material = new THREE.MeshBasicMaterial({side: THREE.DoubleSide, // 双面可见map: texture,  // 纹理贴图// vertexColors: true // 顶点颜色
})console.log(geometry, 'geometry')// 创建网格
const cube = new THREE.Mesh(geometry, material)
scene.add(cube)// 添加坐标辅助线
const axesHelper = new THREE.AxesHelper( 5 );
scene.add( axesHelper );onMounted(() => {// 渲染器const renderer = new THREE.WebGLRenderer();renderer.setSize(window.innerWidth, window.innerHeight);// 将渲染器添加到页面document.getElementById("container").appendChild(renderer.domElement);// 轨道控制器const controls = new OrbitControls(camera, renderer.domElement);// 动画function animate() {// 更新动画requestAnimationFrame(animate);// 轨道控制器更新controls.update();renderer.render(scene, camera);}animate();
});
</script>

二、效果

1、原图

2、截取后