add all the stars, better visibility

input.example.csv

@@ -0,0 +1,11 @@
+1 ;* 61 Cyg B;Er*;082.3171310715589 -05.8262372280102;K7V   ;3.4964 
+2 ;* 61 Cyg A;BY*;082.3197403091576 -05.8181041502094;K5V   ;3.4965 
+3 ;GAT 1383  ;PM*;085.6450087237446 -07.3769487234860;M5.5V ;14.5094
+4 ;BD+40 4631;PM*;089.4905214280362 -08.8259946066449;K8V   ;19.837 
+5 ;V* EV Lac ;Er*;100.6067176270883 -13.0693645782006;M4.0Ve;5.0515 
+6 ;G 216-43  ;PM*;107.6831520259098 -14.9929080409418;M4.5  ;35.6304
+7 ;BD+45 4378;SB*;113.6133003656408 -15.1866691700906;K7V   ;17.1213
+8 ;LP 149-14 ;PM*;114.0239531748840 -14.2146886796646;M5.0V ;19.189 
+9 ;HD 38B    ;PM*;114.6501340218375 -16.3243260935338;M0.5V ;11.518 
+10;HD 38A    ;SB*;114.6505214717521 -16.3226459980874;K6V   ;11.5207
+11;BD+44 4548;PM*;114.5559641502924 -16.3315501979801;M2Ve  ;11.5035

package.json

@@ -15,6 +15,7 @@
     "@types/three": "^0.148.0",
     "@typescript-eslint/eslint-plugin": "^5.48.2",
     "@typescript-eslint/parser": "^5.48.2",
+    "csv-parse": "^5.3.3",
     "eslint": "^8.32.0",
     "eslint-config-prettier": "^8.6.0",
     "eslint-plugin-prettier": "^4.2.1",

simbad4csv2json.js

@@ -0,0 +1,38 @@
+import { parse } from 'csv-parse'
+import { readFile, writeFile } from 'fs/promises'
+;(async () => {
+  const content = await readFile('input.csv')
+  const records = []
+  const columns = ['id', 'name', 'type', 'coords', 'spectral', 'distance']
+  const parser = parse(content, {
+    bom: true,
+    delimiter: ';',
+    trim: true,
+    columns,
+  })
+
+  parser.on('readable', () => {
+    let record
+    while ((record = parser.read()) !== null) {
+      // objects without spectral class are probably not stars
+      if (record.spectral === '~') continue
+
+      const [phi, theta] = record.coords.split(' ').map((n) => parseFloat(n))
+
+      records.push({
+        id: parseInt(record.id),
+        name: record.name,
+        type: record.type,
+        spectral: record.spectral,
+        radius: parseFloat(record.distance),
+        phi,
+        theta,
+      })
+    }
+  })
+
+  parser.on('end', async () => {
+    await writeFile('output.json', JSON.stringify(records))
+    console.log('wrote', records.length, 'records to output.json')
+  })
+})()

src/main.ts

@@ -11,10 +11,10 @@ import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
 import { planeGeometry } from './plane'
 import { renderStars, Star } from './stars'
 
-function init() {
+async function init() {
   const w = window.innerWidth
   const h = window.innerHeight
-  const radius = 50
+  const radius = 5
   const infoEl = document.getElementById('info')!
 
   const renderer = new WebGLRenderer({ antialias: true })
@@ -24,18 +24,19 @@ function init() {
   const camera = new PerspectiveCamera(30, w / h, 0.01, 1001)
   camera.position.x = 0
   camera.position.y = radius
-  camera.position.z = radius * 2
+  camera.position.z = radius * 5
 
   const controls = new OrbitControls(camera, renderer.domElement)
   controls.enableZoom = true
   controls.enableRotate = true
   controls.enablePan = true
-  controls.maxDistance = radius * 2.5
+  controls.maxDistance = radius * 5
   controls.minDistance = 0.1
   controls.listenToKeyEvents(window)
 
   const plane = planeGeometry(radius)
-  const stars = renderStars(radius)
+  const stars = await renderStars(radius)
+  infoEl.innerText = `Currently diplaying ${stars.children.length} stars.`
 
   scene.add(stars)
   scene.add(plane)
@@ -55,7 +56,7 @@ function init() {
     pointer.y = -(event.clientY / window.innerHeight) * 2 + 1
   })
   document.addEventListener('click', () => {
-    infoEl.innerText = 'Click a star to get options.'
+    infoEl.innerText = `Currently diplaying ${stars.children.length} stars.`
     for (let star of stars.children) {
       ;(star as Star).highlighted = false
     }
@@ -100,11 +101,17 @@ function init() {
 
     renderer.render(scene, camera)
 
+    const distanceToPlane = camera.position.distanceTo(plane.children[0].position)
+
     // update label positions in HTML space
     // Attention: This has to happen after the render call, to avoid flickering
-    for (let star of stars.children) {
+    for (let star of stars.children as Star[]) {
-      ;(star as Star).setLabelPos(camera, w, h)
+      star.setLabelPos(camera, w, h)
-      // set label z-index to distance to make them overlap intuitively
+      if (camera.position.distanceTo(star.coords) > distanceToPlane) {
+        star.dimLabel()
+      } else {
+        star.undimLabel()
+      }
     }
   })
 

src/plane.ts

@@ -1,9 +1,32 @@
-import { BufferGeometry, Group, Line, LineBasicMaterial, Shape, Vector3 } from 'three'
+import {
+  BufferGeometry,
+  Group,
+  Line,
+  LineBasicMaterial,
+  MeshBasicMaterial,
+  Shape,
+  ShapeGeometry,
+  Mesh,
+  Vector3,
+  DoubleSide,
+} from 'three'
 
 export function planeGeometry(radius: number, n = 5) {
-  const material = new LineBasicMaterial({ color: 0x205020 })
+  const lineMaterial = new LineBasicMaterial({ color: 0x205020 })
+  const shapeMaterial = new MeshBasicMaterial({
+    color: 0x0,
+    transparent: true,
+    opacity: 0.8,
+    side: DoubleSide,
+  })
   const plane = new Group()
 
+  const shape = new Shape()
+  shape.moveTo(0, 0).absarc(0, 0, radius, 0, Math.PI * 2, false)
+  const shapeGeometry = new ShapeGeometry(shape)
+  shapeGeometry.rotateX(Math.PI / 2)
+  plane.add(new Mesh(shapeGeometry, shapeMaterial))
+
   const xLine = new BufferGeometry().setFromPoints([
     new Vector3(-radius, 0, 0),
     new Vector3(radius, 0, 0),
@@ -19,9 +42,9 @@ export function planeGeometry(radius: number, n = 5) {
     new Vector3(0, 0, radius),
   ])
 
-  plane.add(new Line(xLine, material))
+  plane.add(new Line(xLine, lineMaterial))
-  plane.add(new Line(yLine, material))
+  plane.add(new Line(yLine, lineMaterial))
-  plane.add(new Line(zLine, material))
+  plane.add(new Line(zLine, lineMaterial))
 
   const step = Math.round(radius / n)
 
@@ -29,7 +52,7 @@ export function planeGeometry(radius: number, n = 5) {
     const shape = new Shape().moveTo(0, r).absarc(0, 0, r, 0, Math.PI * 2, false)
     shape.autoClose = true
     const geometry = new BufferGeometry().setFromPoints(shape.getPoints())
-    const line = new Line(geometry, material)
+    const line = new Line(geometry, lineMaterial)
     line.rotateX(Math.PI / 2)
     plane.add(line)
   }

src/stars.ts

@@ -27,14 +27,16 @@ export class Star extends Group {
   public starData: StarData
   public labelEl = document.createElement('label')
 
-  private coords = new Vector3()
+  private labelDimmed = false
+
+  public coords = new Vector3()
 
   private isHighlighted = false
-  private normalPointSize = 2
+  private normalPointSize: number
-  private highlightedPointSize = 3
+  private highlightedPointSize: number
 
   private lineMaterial = new LineBasicMaterial({ color: 0xffffff })
-  private pointMaterial = new PointsMaterial({ size: this.normalPointSize, vertexColors: true })
+  private pointMaterial = new PointsMaterial({ size: 1, vertexColors: true })
   private pointGeometry = new BufferGeometry()
 
   private whiteColor = new Float32BufferAttribute([255, 255, 255], 3)
@@ -42,10 +44,13 @@ export class Star extends Group {
 
   private point: Points<BufferGeometry, PointsMaterial>
 
-  constructor(starData: StarData) {
+  constructor(starData: StarData, maxRadius: number) {
     super()
 
     this.starData = starData
+    this.normalPointSize = maxRadius / 25
+    this.highlightedPointSize = this.normalPointSize * 1.5
+    this.pointMaterial.setValues({ size: this.normalPointSize })
 
     const { radius, phi, theta } = starData
     const sphericalCoords = new Spherical(radius, phi, theta)
@@ -70,7 +75,8 @@ export class Star extends Group {
 
     // label
     const container = document.getElementById('labels')!
-    this.labelEl.innerText = starData.name
+    // stars with a proper name start with NAME, so lets strip that away
+    this.labelEl.innerText = starData.name.replace(/^NAME /, '')
     container.appendChild(this.labelEl)
   }
 
@@ -106,17 +112,34 @@ export class Star extends Group {
     pos.y = Math.round((0.5 - pos.y / 2) * (height / dpr))
 
     this.labelEl.style.transform = `translate(${pos.x}px, ${pos.y}px)`
+
+    if (this.labelDimmed) {
+      this.labelEl.style.zIndex = '0'
+    } else {
       const zIndex = `${10000000 - Math.round(pos.z * 10000000)}` // ridiculous
       this.labelEl.style.zIndex = zIndex
     }
   }
 
-export function renderStars(maxRadius: number) {
+  public dimLabel() {
+    this.labelDimmed = true
+    this.labelEl.style.opacity = '0.3'
+    this.labelEl.style.zIndex = '0'
+  }
+
+  public undimLabel() {
+    this.labelEl.style.opacity = '1'
+    this.labelDimmed = false
+  }
+}
+
+export async function renderStars(maxRadius: number) {
   const group = new Group()
+  const data: StarData[] = (await import('./stars.json')).default
 
   data.forEach((starData) => {
     if (starData.radius > maxRadius) return
-    const star = new Star(starData)
+    const star = new Star(starData, maxRadius)
     group.add(star)
   })
 

yarn.lock

@@ -383,6 +383,11 @@ cross-spawn@^7.0.2:
     shebang-command "^2.0.0"
     which "^2.0.1"
 
+csv-parse@^5.3.3:
+  version "5.3.3"
+  resolved "https://registry.yarnpkg.com/csv-parse/-/csv-parse-5.3.3.tgz#3b75d2279e2edb550cbc54c65b25cbbf3d0033ad"
+  integrity sha512-kEWkAPleNEdhFNkHQpFHu9RYPogsFj3dx6bCxL847fsiLgidzWg0z/O0B1kVWMJUc5ky64zGp18LX2T3DQrOfw==
+
 debug@^4.1.1, debug@^4.3.2, debug@^4.3.4:
   version "4.3.4"
   resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.4.tgz#1319f6579357f2338d3337d2cdd4914bb5dcc865"