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Geometries

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This course was updated in 2024. For the newer content, please visit Geometries

Video Lecture

Geometries

Description

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Three.js has many classes for creating common geometries.

Start Scripts

./dist/client/index.html

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Three.js TypeScript Tutorials by Sean Bradley : https://sbcode.net/threejs</title>
    <style>
      body {
        overflow: hidden;
        margin: 0px;
      }

      #debug1 {
        font-family: monospace;
        font-size: larger;
        position: absolute;
        left: 0px;
        top: 50px;
        border: 1px solid red;
        width: 180px;
        height: 310px;
        color: white;
        pointer-events: none;
      }
    </style>
  </head>

  <body>
    <div id="debug1"></div>
    <script type="module" src="bundle.js"></script>
  </body>
</html>

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'dat.gui'

const scene = new THREE.Scene()
scene.add(new THREE.AxesHelper(5))

const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000)
camera.position.x = -2
camera.position.y = 4
camera.position.z = 5

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

new OrbitControls(camera, renderer.domElement)

const boxGeometry = new THREE.BoxGeometry()
// const sphereGeometry = new THREE.SphereGeometry()
// const icosahedronGeometry = new THREE.IcosahedronGeometry()

//console.log(boxGeometry)

const material = new THREE.MeshBasicMaterial({
  color: 0x00ff00,
  wireframe: true,
})

const cube = new THREE.Mesh(boxGeometry, material)
//cube.position.x = 5
scene.add(cube)

// const sphere = new THREE.Mesh(sphereGeometry, material)
// sphere.position.x = -5
// scene.add(sphere)

// const icosahedron = new THREE.Mesh(icosahedronGeometry, material)
// scene.add(icosahedron)

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight
  camera.updateProjectionMatrix()
  renderer.setSize(window.innerWidth, window.innerHeight)
  render()
}

const stats = new Stats()
document.body.appendChild(stats.dom)

const gui = new GUI()
const cubeFolder = gui.addFolder('Cube')
const cubeRotationFolder = cubeFolder.addFolder('Rotation')
cubeRotationFolder.add(cube.rotation, 'x', 0, Math.PI * 2, 0.01)
cubeRotationFolder.add(cube.rotation, 'y', 0, Math.PI * 2, 0.01)
cubeRotationFolder.add(cube.rotation, 'z', 0, Math.PI * 2, 0.01)
const cubePositionFolder = cubeFolder.addFolder('Position')
cubePositionFolder.add(cube.position, 'x', -10, 10)
cubePositionFolder.add(cube.position, 'y', -10, 10)
cubePositionFolder.add(cube.position, 'z', -10, 10)
const cubeScaleFolder = cubeFolder.addFolder('Scale')
cubeScaleFolder.add(cube.scale, 'x', -5, 5, 0.1) //.onFinishChange(() => console.dir(cube.geometry))
cubeScaleFolder.add(cube.scale, 'y', -5, 5, 0.1)
cubeScaleFolder.add(cube.scale, 'z', -5, 5, 0.1)
cubeFolder.add(cube, 'visible', true)
cubeFolder.open()

// const cubeData = {
//     width: 1,
//     height: 1,
//     depth: 1,
//     widthSegments: 1,
//     heightSegments: 1,
//     depthSegments: 1,
// }
// const cubePropertiesFolder = cubeFolder.addFolder('Properties')
// cubePropertiesFolder
//     .add(cubeData, 'width', 1, 30)
//     .onChange(regenerateBoxGeometry)
//     .onFinishChange(() => console.dir(cube.geometry))
// cubePropertiesFolder.add(cubeData, 'height', 1, 30).onChange(regenerateBoxGeometry)
// cubePropertiesFolder.add(cubeData, 'depth', 1, 30).onChange(regenerateBoxGeometry)
// cubePropertiesFolder.add(cubeData, 'widthSegments', 1, 30).onChange(regenerateBoxGeometry)
// cubePropertiesFolder.add(cubeData, 'heightSegments', 1, 30).onChange(regenerateBoxGeometry)
// cubePropertiesFolder.add(cubeData, 'depthSegments', 1, 30).onChange(regenerateBoxGeometry)

// function regenerateBoxGeometry() {
//     const newGeometry = new THREE.BoxGeometry(
//         cubeData.width,
//         cubeData.height,
//         cubeData.depth,
//         cubeData.widthSegments,
//         cubeData.heightSegments,
//         cubeData.depthSegments
//     )
//     cube.geometry.dispose()
//     cube.geometry = newGeometry
// }

// const sphereData = {
//     radius: 1,
//     widthSegments: 8,
//     heightSegments: 6,
//     phiStart: 0,
//     phiLength: Math.PI * 2,
//     thetaStart: 0,
//     thetaLength: Math.PI,
// }
// const sphereFolder = gui.addFolder('Sphere')
// const spherePropertiesFolder = sphereFolder.addFolder('Properties')
// spherePropertiesFolder.add(sphereData, 'radius', 0.1, 30).onChange(regenerateSphereGeometry)
// spherePropertiesFolder.add(sphereData, 'widthSegments', 1, 32).onChange(regenerateSphereGeometry)
// spherePropertiesFolder.add(sphereData, 'heightSegments', 1, 16).onChange(regenerateSphereGeometry)
// spherePropertiesFolder
//     .add(sphereData, 'phiStart', 0, Math.PI * 2)
//     .onChange(regenerateSphereGeometry)
// spherePropertiesFolder
//     .add(sphereData, 'phiLength', 0, Math.PI * 2)
//     .onChange(regenerateSphereGeometry)
// spherePropertiesFolder.add(sphereData, 'thetaStart', 0, Math.PI).onChange(regenerateSphereGeometry)
// spherePropertiesFolder.add(sphereData, 'thetaLength', 0, Math.PI).onChange(regenerateSphereGeometry)

// function regenerateSphereGeometry() {
//     const newGeometry = new THREE.SphereGeometry(
//         sphereData.radius,
//         sphereData.widthSegments,
//         sphereData.heightSegments,
//         sphereData.phiStart,
//         sphereData.phiLength,
//         sphereData.thetaStart,
//         sphereData.thetaLength
//     )
//     sphere.geometry.dispose()
//     sphere.geometry = newGeometry
// }

// const icosahedronData = {
//     radius: 1,
//     detail: 0,
// }
// const icosahedronFolder = gui.addFolder('Icosahedron')
// const icosahedronPropertiesFolder = icosahedronFolder.addFolder('Properties')
// icosahedronPropertiesFolder
//     .add(icosahedronData, 'radius', 0.1, 10)
//     .onChange(regenerateIcosahedronGeometry)
// icosahedronPropertiesFolder
//     .add(icosahedronData, 'detail', 0, 5)
//     .step(1)
//     .onChange(regenerateIcosahedronGeometry)

// function regenerateIcosahedronGeometry() {
//     const newGeometry = new THREE.IcosahedronGeometry(
//         icosahedronData.radius,
//         icosahedronData.detail
//     )
//     icosahedron.geometry.dispose()
//     icosahedron.geometry = newGeometry
// }

//const debug = document.getElementById('debug1') as HTMLDivElement

function animate() {
  requestAnimationFrame(animate)

  render()

  //debug.innerText = 'Matrix\n' + cube.matrix.elements.toString().replace(/,/g, '\n')

  stats.update()
}

function render() {
  renderer.render(scene, camera)
}

animate()

Final Script

./src/client/client.ts

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import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'dat.gui'

const scene = new THREE.Scene()
scene.add(new THREE.AxesHelper(5))

const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000)
camera.position.x = -2
camera.position.y = 4
camera.position.z = 5

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)

new OrbitControls(camera, renderer.domElement)

const boxGeometry = new THREE.BoxGeometry()
const sphereGeometry = new THREE.SphereGeometry()
const icosahedronGeometry = new THREE.IcosahedronGeometry()

//console.dir(boxGeometry)
const material = new THREE.MeshBasicMaterial({
  color: 0x00ff00,
  wireframe: true,
})

const cube = new THREE.Mesh(boxGeometry, material)
cube.position.x = 5
scene.add(cube)

const sphere = new THREE.Mesh(sphereGeometry, material)
sphere.position.x = -5
scene.add(sphere)

const icosahedron = new THREE.Mesh(icosahedronGeometry, material)
scene.add(icosahedron)

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight
  camera.updateProjectionMatrix()
  renderer.setSize(window.innerWidth, window.innerHeight)
  render()
}

const stats = new Stats()
document.body.appendChild(stats.dom)

const gui = new GUI()
const cubeFolder = gui.addFolder('Cube')
const cubeRotationFolder = cubeFolder.addFolder('Rotation')
cubeRotationFolder.add(cube.rotation, 'x', 0, Math.PI * 2, 0.01)
cubeRotationFolder.add(cube.rotation, 'y', 0, Math.PI * 2, 0.01)
cubeRotationFolder.add(cube.rotation, 'z', 0, Math.PI * 2, 0.01)
const cubePositionFolder = cubeFolder.addFolder('Position')
cubePositionFolder.add(cube.position, 'x', -10, 10)
cubePositionFolder.add(cube.position, 'y', -10, 10)
cubePositionFolder.add(cube.position, 'z', -10, 10)
const cubeScaleFolder = cubeFolder.addFolder('Scale')
cubeScaleFolder.add(cube.scale, 'x', -5, 5, 0.1).onFinishChange(() => console.dir(cube.geometry))
cubeScaleFolder.add(cube.scale, 'y', -5, 5, 0.1)
cubeScaleFolder.add(cube.scale, 'z', -5, 5, 0.1)
cubeFolder.add(cube, 'visible', true)
cubeFolder.open()

const cubeData = {
  width: 1,
  height: 1,
  depth: 1,
  widthSegments: 1,
  heightSegments: 1,
  depthSegments: 1,
}
const cubePropertiesFolder = cubeFolder.addFolder('Properties')
cubePropertiesFolder
  .add(cubeData, 'width', 1, 30)
  .onChange(regenerateBoxGeometry)
  .onFinishChange(() => console.dir(cube.geometry))
cubePropertiesFolder.add(cubeData, 'height', 1, 30).onChange(regenerateBoxGeometry)
cubePropertiesFolder.add(cubeData, 'depth', 1, 30).onChange(regenerateBoxGeometry)
cubePropertiesFolder.add(cubeData, 'widthSegments', 1, 30).onChange(regenerateBoxGeometry)
cubePropertiesFolder.add(cubeData, 'heightSegments', 1, 30).onChange(regenerateBoxGeometry)
cubePropertiesFolder.add(cubeData, 'depthSegments', 1, 30).onChange(regenerateBoxGeometry)

function regenerateBoxGeometry() {
  const newGeometry = new THREE.BoxGeometry(
    cubeData.width,
    cubeData.height,
    cubeData.depth,
    cubeData.widthSegments,
    cubeData.heightSegments,
    cubeData.depthSegments
  )
  cube.geometry.dispose()
  cube.geometry = newGeometry
}

const sphereData = {
  radius: 1,
  widthSegments: 8,
  heightSegments: 6,
  phiStart: 0,
  phiLength: Math.PI * 2,
  thetaStart: 0,
  thetaLength: Math.PI,
}
const sphereFolder = gui.addFolder('Sphere')
const spherePropertiesFolder = sphereFolder.addFolder('Properties')
spherePropertiesFolder.add(sphereData, 'radius', 0.1, 30).onChange(regenerateSphereGeometry)
spherePropertiesFolder.add(sphereData, 'widthSegments', 1, 32).onChange(regenerateSphereGeometry)
spherePropertiesFolder.add(sphereData, 'heightSegments', 1, 16).onChange(regenerateSphereGeometry)
spherePropertiesFolder.add(sphereData, 'phiStart', 0, Math.PI * 2).onChange(regenerateSphereGeometry)
spherePropertiesFolder.add(sphereData, 'phiLength', 0, Math.PI * 2).onChange(regenerateSphereGeometry)
spherePropertiesFolder.add(sphereData, 'thetaStart', 0, Math.PI).onChange(regenerateSphereGeometry)
spherePropertiesFolder.add(sphereData, 'thetaLength', 0, Math.PI).onChange(regenerateSphereGeometry)

function regenerateSphereGeometry() {
  const newGeometry = new THREE.SphereGeometry(
    sphereData.radius,
    sphereData.widthSegments,
    sphereData.heightSegments,
    sphereData.phiStart,
    sphereData.phiLength,
    sphereData.thetaStart,
    sphereData.thetaLength
  )
  sphere.geometry.dispose()
  sphere.geometry = newGeometry
}

const icosahedronData = {
  radius: 1,
  detail: 0,
}
const icosahedronFolder = gui.addFolder('Icosahedron')
const icosahedronPropertiesFolder = icosahedronFolder.addFolder('Properties')
icosahedronPropertiesFolder.add(icosahedronData, 'radius', 0.1, 10).onChange(regenerateIcosahedronGeometry)
icosahedronPropertiesFolder.add(icosahedronData, 'detail', 0, 5).step(1).onChange(regenerateIcosahedronGeometry)

function regenerateIcosahedronGeometry() {
  const newGeometry = new THREE.IcosahedronGeometry(icosahedronData.radius, icosahedronData.detail)
  icosahedron.geometry.dispose()
  icosahedron.geometry = newGeometry
}

const debug = document.getElementById('debug1') as HTMLDivElement

function animate() {
  requestAnimationFrame(animate)

  render()

  debug.innerText = 'Matrix\n' + cube.matrix.elements.toString().replace(/,/g, '\n')

  stats.update()
}

function render() {
  renderer.render(scene, camera)
}

animate()

Transformation matrix : Wikipedia

THREE.Matrix4

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