Three.js - TorusGeometry 圆环几何体
圆环是一种管状形状，看起来像甜甜圈。您可以使用 THREE.TorusGeometry 在 Three.js 中创建圆环。参数 radiusSegments 和 tuberculosisSegments 是沿半径和管的段数。使用 arc 属性，您可以控制圆环是否绘制了完整的圆。
const torus = new THREE.TorusGeometry( radius, tubeRadius, radialSegments, tubularSegments, arc )
示例
查看以下示例。
torus.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Three.js - Torus</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: -applesystem, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu,
Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
html,
body {
height: 100vh;
width: 100vw;
}
#threejs-container {
position: block;
width: 100%;
height: 100%;
}
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.7.7/dat.gui.js"></script>
</head>
<body>
<div id="threejs-container"></div>
<script type="module">
// Torus geometry
// creating a torus, a donut like shape in Three.js
// GUI
const gui = new dat.GUI()
// sizes
let width = window.innerWidth
let height = window.innerHeight
// scene
const scene = new THREE.Scene()
scene.background = new THREE.Color(0x262626)
// camera
const camera = new THREE.PerspectiveCamera(30, width / height, 0.1, 100)
camera.position.set(0, 0, 10)
const camFolder = gui.addFolder('Camera')
camFolder.add(camera.position, 'z').min(10).max(60).step(10)
camFolder.open()
// torus
const geometry = new THREE.TorusGeometry()
const material = new THREE.MeshBasicMaterial({
color: 0xffffff,
wireframe: true
})
const materialFolder = gui.addFolder('Material')
materialFolder.add(material, 'wireframe')
materialFolder.open()
const torus = new THREE.Mesh(geometry, material)
scene.add(torus)
const torusProps = {
radius: 1,
tubeRadius: 0.5,
radialSegments: 8,
tubularSegments: 6,
arc: 2 * Math.PI
}
const props = gui.addFolder('Properties')
props
.add(torusProps, 'radius', 1, 50)
.step(1)
.onChange(redraw)
.onFinishChange(() => console.dir(torus.geometry))
props.add(torusProps, 'tubeRadius', 0.1, 50).step(0.1).onChange(redraw)
props.add(torusProps, 'radialSegments', 1, 50).step(1).onChange(redraw)
props.add(torusProps, 'tubularSegments', 1, 50).step(1).onChange(redraw)
props.add(torusProps, 'arc', 0, 2 * Math.PI).onChange(redraw)
props.open()
function redraw() {
let newGeometry = new THREE.TorusGeometry(
torusProps.radius,
torusProps.tubeRadius,
torusProps.radialSegments,
torusProps.tubularSegments,
torusProps.arc
)
torus.geometry.dispose()
torus.geometry = newGeometry
}
// responsiveness
window.addEventListener('resize', () => {
width = window.innerWidth
height = window.innerHeight
camera.aspect = width / height
camera.updateProjectionMatrix()
renderer.setSize(window.innerWidth, window.innerHeight)
renderer.render(scene, camera)
})
// renderer
const renderer = new THREE.WebGL1Renderer()
renderer.setSize(width, height)
renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2))
// animation
function animate() {
requestAnimationFrame(animate)
torus.rotation.x += 0.005
torus.rotation.y += 0.01
renderer.render(scene, camera)
}
// rendering the scene
const container = document.querySelector('#threejs-container')
container.append(renderer.domElement)
renderer.render(scene, camera)
animate()
</script>
</body>
</html>
threejs_geometries.html
