Three.js - 平面几何学

THREE.PlaneGeometry 创建一个简单的 2D 矩形。它采用四个参数，即必需的 width 和 height，以及可选的 widthSegments 和 heightSegments。

width - 矩形的宽度。
height - 矩形的高度。
widthSegments - 宽度应该划分的段数。其默认值为 1。
heightSegments - 高度应该划分的段数。其默认值为 1。

const plane = new THREE.PlaneGeometry(
   width, height,
   widthSegments, heightSegments
)

示例

查看以下示例。

plane.html

实时演示

<!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 - Plane</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">
         // Plane geometry
         // A rotating 2d rectangle 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()
         // Light
         const ambientLight = new THREE.AmbientLight(0xffffff, 1)
         scene.add(ambientLight)
         const pointLight = new THREE.PointLight(0xffffff, 0.2)
         pointLight.position.x = 2
         pointLight.position.y = 3
         pointLight.position.z = 4
         scene.add(pointLight)
         // plane
         const geometry = new THREE.PlaneGeometry(1, 1)
         const material = new THREE.MeshBasicMaterial({
            color: 0xffffff,
            wireframe: true,
            side: THREE.DoubleSide
         })
         const materialFolder = gui.addFolder('Material')
         materialFolder.add(material, 'wireframe')
         materialFolder.open()
         const plane = new THREE.Mesh(geometry, material)
         scene.add(plane)
         // experimenting plane properties
         const planeProps = {
            width: 1,
            height: 1,
            widthSegments: 1,
            heightSegments: 1
         }
         const props = gui.addFolder('Properties')
         props
            .add(planeProps, 'width', 1, 30)
            .step(1)
            .onChange(redraw)
            .onFinishChange(() => console.dir(plane.geometry))
         props.add(planeProps, 'height', 1, 30).step(1).onChange(redraw)
         props.add(planeProps, 'widthSegments', 1, 30).step(1).onChange(redraw)
         props.add(planeProps, 'heightSegments', 1, 30).step(1).onChange(redraw)
         props.open()
         function redraw() {
            let newGeometry = new THREE.PlaneGeometry(
               planeProps.width,
               planeProps.height,
               planeProps.widthSegments,
               planeProps.heightSegments
            )
            plane.geometry.dispose()
            plane.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)
            plane.rotation.x += 0.005
            plane.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>

输出

threejs_geometries.htm

打印页面

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