javascript
/
three.js
spogulis no https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Scenegraph - Sun Earth</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
        color: white;
        font-family: monospace;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    #ui {
        position: absolute;
        right: 1em;
        top: 1em;
        background: rgba(64, 64, 64, 0.8);
        padding: .5em;
    }
    #ui .axisgrid {
        display: flex;
        align-items: center;
    }
    #ui .axisgrid:nth-child(odd) {
      background: rgba(72, 72, 72, 0.8);
    }
    #ui .label {
        width: 8em;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    #ui .checkbox {
        display: flex;
        align-items: center;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
    <div id="ui"></div>
  </body>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>

<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js",
    "three/addons/": "../../examples/jsm/"
  }
}
</script>

<script type="module">
import * as THREE from 'three';
import {GUI} from 'three/addons/libs/lil-gui.module.min.js';

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({antialias: true, canvas});
  const gui = new GUI();

  const fov = 40;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 1000;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.set(0, 50, 0);
  camera.up.set(0, 0, 1);
  camera.lookAt(0, 0, 0);

  const scene = new THREE.Scene();

  {
    const color = 0xFFFFFF;
    const intensity = 3;
    const light = new THREE.PointLight(color, intensity);
    scene.add(light);
  }

  const objects = [];

  const radius = 1;
  const widthSegments = 6;
  const heightSegments = 6;
  const sphereGeometry = new THREE.SphereGeometry(
      radius, widthSegments, heightSegments);

  const solarSystem = new THREE.Object3D();
  scene.add(solarSystem);
  objects.push(solarSystem);

  const sunMaterial = new THREE.MeshPhongMaterial({emissive: 0xFFFF00});
  const sunMesh = new THREE.Mesh(sphereGeometry, sunMaterial);
  sunMesh.scale.set(5, 5, 5);
  solarSystem.add(sunMesh);
  objects.push(sunMesh);

  const earthOrbit = new THREE.Object3D();
  earthOrbit.position.x = 10;
  solarSystem.add(earthOrbit);
  objects.push(earthOrbit);

  const earthMaterial = new THREE.MeshPhongMaterial({color: 0x2233FF, emissive: 0x112244});
  const earthMesh = new THREE.Mesh(sphereGeometry, earthMaterial);
  earthOrbit.add(earthMesh);
  objects.push(earthMesh);

  const moonOrbit = new THREE.Object3D();
  moonOrbit.position.x = 2;
  earthOrbit.add(moonOrbit);

  const moonMaterial = new THREE.MeshPhongMaterial({color: 0x888888, emissive: 0x222222});
  const moonMesh = new THREE.Mesh(sphereGeometry, moonMaterial);
  moonMesh.scale.set(.5, .5, .5);
  moonOrbit.add(moonMesh);
  objects.push(moonMesh);

  // Turns both axes and grid visible on/off
  // GUI requires a property that returns a bool
  // to decide to make a checkbox so we make a setter
  // can getter for `visible` which we can tell GUI
  // to look at.
  class AxisGridHelper {
    constructor(node, units = 10) {
      const axes = new THREE.AxesHelper();
      axes.material.depthTest = false;
      axes.renderOrder = 2;  // after the grid
      node.add(axes);

      const grid = new THREE.GridHelper(units, units);
      grid.material.depthTest = false;
      grid.renderOrder = 1;
      node.add(grid);

      this.grid = grid;
      this.axes = axes;
      this.visible = false;
    }
    get visible() {
      return this._visible;
    }
    set visible(v) {
      this._visible = v;
      this.grid.visible = v;
      this.axes.visible = v;
    }
  }

  function makeAxisGrid(node, label, units) {
    const helper = new AxisGridHelper(node, units);
    gui.add(helper, 'visible').name(label);
  }

  makeAxisGrid(solarSystem, 'solarSystem', 26);
  makeAxisGrid(sunMesh, 'sunMesh');
  makeAxisGrid(earthOrbit, 'earthOrbit');
  makeAxisGrid(earthMesh, 'earthMesh');
  makeAxisGrid(moonOrbit, 'moonOrbit');
  makeAxisGrid(moonMesh, 'moonMesh');

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function render(time) {
    time *= 0.001;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    objects.forEach((obj) => {
      obj.rotation.y = time;
    });

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>