script.js

import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import rhino3dm from 'rhino3dm'

const downloadButton = document.getElementById("downloadButton")
downloadButton.onclick = download

let rhino, doc
rhino3dm().then(async m => {
  console.log('Loaded rhino3dm.')
  rhino = m // global
  init()
  create()
})

function create() {

  doc = new rhino.File3dm()
  const loader = new THREE.BufferGeometryLoader();

  // -- POINTS / POINTCLOUDS -- //

  // POINTS

  let ptA = [0, 0, 0]

  const geometry = new THREE.BufferGeometry()
  const vertices = new Float32Array(ptA)
  geometry.setAttribute('position', new THREE.BufferAttribute(vertices, 3))
  const pointsMaterial = new THREE.PointsMaterial({ color: 0xff0000 })
  const threejsPoint = new THREE.Points(geometry, pointsMaterial)

  scene.add(threejsPoint)
  doc.objects().addPoint(ptA)

  // POINTCLOUD

  const ptB = [10, 0, 0]
  const ptC = [10, 10, 0]
  const ptD = [0, 10, 0]
  const ptE = [20, 20, 20]
  const ptF = [30, 0, 0]
  const ptG = [35, 5, 0]
  const ptH = [40, -5, 0]
  const ptI = [45, 5, 0]
  const ptJ = [50, 0, 0]

  const red = { r: 255, g: 0, b: 0, a: 0 }

  const pointCloud = new rhino.PointCloud()
  pointCloud.add(ptA, red)
  pointCloud.add(ptB, red)
  pointCloud.add(ptC, red)
  pointCloud.add(ptD, red)
  pointCloud.add(ptE, red)
  pointCloud.add(ptF, red)
  pointCloud.add(ptG, red)
  pointCloud.add(ptH, red)
  pointCloud.add(ptI, red)
  pointCloud.add(ptJ, red)

  const threejsPointsGeometry = loader.parse(pointCloud.toThreejsJSON())
  const threejsPoints = new THREE.Points(threejsPointsGeometry, pointsMaterial)

  scene.add(threejsPoints)
  doc.objects().add(pointCloud, null)

  // -- CURVES -- //

  // LINE //

  const line = new rhino.LineCurve(ptA, ptE)

  const lineGeometry = new THREE.BufferGeometry()
  const lineVertices = new Float32Array(line.line.from.concat(line.line.to))
  lineGeometry.setAttribute('position', new THREE.BufferAttribute(lineVertices, 3))
  const lineMaterial = new THREE.LineBasicMaterial({ color: 0x0000ff })
  const lineObject = new THREE.Line(lineGeometry, lineMaterial)
  scene.add(lineObject)
  doc.objects().add(line.toNurbsCurve(), null)

  // CIRCLE //

  const circle = new rhino.Circle(10)

  const circleGeometry = new THREE.RingGeometry(circle.radius, circle.radius, 32)
  const circleObject = new THREE.Line(circleGeometry, lineMaterial)
  circleObject.position.fromArray(circle.center)
  scene.add(circleObject)
  doc.objects().add(circle.toNurbsCurve(), null)

  // ARC //

  const arc = new rhino.Arc(circle, Math.PI)
  const arcGeometry = new THREE.RingGeometry(arc.radius, arc.radius, 32, 1, 0, arc.angleRadians)
  const arcObject = new THREE.Line(arcGeometry, lineMaterial)

  scene.add(arcObject)
  doc.objects().add(arc.toNurbsCurve(), null)

  // ELLIPSE //

  // CURVE //

  const curvePoints = new rhino.Point3dList()
  curvePoints.add(ptF[0], ptF[1], ptF[2])
  curvePoints.add(ptG[0], ptG[1], ptG[2])
  curvePoints.add(ptH[0], ptH[1], ptH[2])
  curvePoints.add(ptI[0], ptI[1], ptI[2])
  curvePoints.add(ptJ[0], ptJ[1], ptJ[2])

  const nurbsCurve = rhino.NurbsCurve.create(false, 3, curvePoints)

  let cPts = []
  let domain = nurbsCurve.domain
  let pointCount = 20
  let divisions = pointCount - 1.0

  for (let i = 0; i < 20; i++) {

    let t = domain[0] + (i / divisions) * (domain[1] - domain[0]);

    const tPt = nurbsCurve.pointAt(t)

    cPts.push(tPt[0])
    cPts.push(tPt[1])
    cPts.push(tPt[2])

  }

  const curveGeometry = new THREE.BufferGeometry()
  const curveVertices = new Float32Array(cPts)
  curveGeometry.setAttribute('position', new THREE.BufferAttribute(curveVertices, 3))
  const curveObject = new THREE.Line(curveGeometry, lineMaterial)

  scene.add(curveObject)
  doc.objects().add(nurbsCurve, null)

  // -- MESHES -- //

  const mesh = new rhino.Mesh()
  mesh.vertices().add(ptA[0], ptA[1], ptA[2])
  mesh.vertices().add(ptB[0], ptB[1], ptB[2])
  mesh.vertices().add(ptC[0], ptC[1], ptC[2])

  mesh.faces().addFace(0, 1, 2)

  mesh.vertexColors().add(255, 0, 255)
  mesh.vertexColors().add(0, 255, 255)
  mesh.vertexColors().add(255, 255, 255)

  mesh.normals().computeNormals()

  const meshGeometry = loader.parse(mesh.toThreejsJSON())
  const threejsMesh = new THREE.Mesh(meshGeometry, new THREE.MeshStandardMaterial({ vertexColors: true }))
  scene.add(threejsMesh)
  doc.objects().add(mesh, null)

  // hide spinner
  document.getElementById('loader').style.display = 'none'

  // enable download button
  downloadButton.disabled = false

  console.log(scene)

}

// download button handler
function download() {
  const options = new rhino.File3dmWriteOptions()
  options.version = 7
  let buffer = doc.toByteArray(options)
  saveByteArray('rhinoObjectTypes' + options.version + '.3dm', buffer)
}

function saveByteArray(fileName, byte) {
  let blob = new Blob([byte], { type: 'application/octect-stream' })
  let link = document.createElement('a')
  link.href = window.URL.createObjectURL(blob)
  link.download = fileName
  link.click()
}

// BOILERPLATE //

let scene, camera, renderer

function init() {

  // Rhino models are z-up, so set this as the default
  THREE.Object3D.DefaultUp = new THREE.Vector3(0, 0, 1)

  scene = new THREE.Scene()
  scene.background = new THREE.Color(1, 1, 1)
  camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000)
  camera.position.z = 50

  renderer = new THREE.WebGLRenderer({ antialias: true })
  renderer.setPixelRatio(window.devicePixelRatio)
  renderer.setSize(window.innerWidth, window.innerHeight)
  document.body.appendChild(renderer.domElement)

  const controls = new OrbitControls(camera, renderer.domElement)

  const light = new THREE.DirectionalLight()
  scene.add(light)

  window.addEventListener('resize', onWindowResize, false)

  animate()
}

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

function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight
  camera.updateProjectionMatrix()
  renderer.setSize(window.innerWidth, window.innerHeight)
  animate()
}