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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js vr - roller coaster</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
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+ <link type="text/css" rel="stylesheet" href="main.css">
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+ </head>
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+ <body>
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+ <script type="importmap">
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+ {
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+ "imports": {
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+ "three": "../build/three.webgpu.js",
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+ "three/webgpu": "../build/three.webgpu.js",
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+ "three/addons/": "./jsm/"
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+ }
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+ }
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+ </script>
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+
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+ <script type="module">
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+
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+ import * as THREE from 'three';
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+
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+ import {
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+ RollerCoasterGeometry,
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+ RollerCoasterShadowGeometry,
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+ RollerCoasterLiftersGeometry,
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+ TreesGeometry,
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+ SkyGeometry
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+ } from 'three/addons/misc/RollerCoaster.js';
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+ import { VRButton } from 'three/addons/webxr/VRButton.js';
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+
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+ let mesh, material, geometry;
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+
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+ const renderer = new THREE.WebGPURenderer( { antialias: true, forceWebGL: true, colorBufferType: THREE.UnsignedByteType, multiview: false } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ renderer.setAnimationLoop( animate );
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+ renderer.xr.enabled = true;
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+ renderer.xr.setReferenceSpaceType( 'local' );
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+ document.body.appendChild( renderer.domElement );
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+
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+ document.body.appendChild( VRButton.createButton( renderer ) );
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+
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+ //
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+
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+ const scene = new THREE.Scene();
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+ scene.background = new THREE.Color( 0xf0f0ff );
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+
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+ const light = new THREE.HemisphereLight( 0xfff0f0, 0x60606, 3 );
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+ light.position.set( 1, 1, 1 );
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+ scene.add( light );
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+
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+ const train = new THREE.Object3D();
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+ scene.add( train );
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+
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+ const camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 500 );
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+ train.add( camera );
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+
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+ // environment
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+
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+ geometry = new THREE.PlaneGeometry( 500, 500, 15, 15 );
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+ geometry.rotateX( - Math.PI / 2 );
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+
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+ const positions = geometry.attributes.position.array;
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+ const vertex = new THREE.Vector3();
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+
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+ for ( let i = 0; i < positions.length; i += 3 ) {
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+
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+ vertex.fromArray( positions, i );
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+
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+ vertex.x += Math.random() * 10 - 5;
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+ vertex.z += Math.random() * 10 - 5;
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+
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+ const distance = ( vertex.distanceTo( scene.position ) / 5 ) - 25;
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+ vertex.y = Math.random() * Math.max( 0, distance );
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+
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+ vertex.toArray( positions, i );
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+
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+ }
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+
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+ geometry.computeVertexNormals();
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+
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+ material = new THREE.MeshLambertMaterial( {
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+ color: 0x407000
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+ } );
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+
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+ mesh = new THREE.Mesh( geometry, material );
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+ scene.add( mesh );
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+
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+ geometry = new TreesGeometry( mesh );
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+ material = new THREE.MeshBasicMaterial( {
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+ side: THREE.DoubleSide, vertexColors: true
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+ } );
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+ mesh = new THREE.Mesh( geometry, material );
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+ scene.add( mesh );
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+
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+ geometry = new SkyGeometry();
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+ material = new THREE.MeshBasicMaterial( { color: 0xffffff } );
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+ mesh = new THREE.Mesh( geometry, material );
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+ scene.add( mesh );
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+
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+ //
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+
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+ const PI2 = Math.PI * 2;
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+
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+ const curve = ( function () {
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+
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+ const vector = new THREE.Vector3();
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+ const vector2 = new THREE.Vector3();
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+
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+ return {
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+
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+ getPointAt: function ( t ) {
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+
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+ t = t * PI2;
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+
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+ const x = Math.sin( t * 3 ) * Math.cos( t * 4 ) * 50;
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+ const y = Math.sin( t * 10 ) * 2 + Math.cos( t * 17 ) * 2 + 5;
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+ const z = Math.sin( t ) * Math.sin( t * 4 ) * 50;
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+
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+ return vector.set( x, y, z ).multiplyScalar( 2 );
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+
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+ },
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+
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+ getTangentAt: function ( t ) {
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+
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+ const delta = 0.0001;
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+ const t1 = Math.max( 0, t - delta );
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+ const t2 = Math.min( 1, t + delta );
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+
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+ return vector2.copy( this.getPointAt( t2 ) )
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+ .sub( this.getPointAt( t1 ) ).normalize();
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+
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+ }
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+
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+ };
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+
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+ } )();
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+
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+ geometry = new RollerCoasterGeometry( curve, 1500 );
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+ material = new THREE.MeshPhongMaterial( {
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+ vertexColors: true
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+ } );
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+ mesh = new THREE.Mesh( geometry, material );
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+ scene.add( mesh );
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+
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+ geometry = new RollerCoasterLiftersGeometry( curve, 100 );
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+ material = new THREE.MeshPhongMaterial();
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+ mesh = new THREE.Mesh( geometry, material );
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+ mesh.position.y = 0.1;
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+ scene.add( mesh );
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+
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+ geometry = new RollerCoasterShadowGeometry( curve, 500 );
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+ material = new THREE.MeshBasicMaterial( {
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+ color: 0x305000, depthWrite: false, transparent: true
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+ } );
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+ mesh = new THREE.Mesh( geometry, material );
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+ mesh.position.y = 0.1;
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+ scene.add( mesh );
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+
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+ const funfairs = [];
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+
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+ //
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+
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+ geometry = new THREE.CylinderGeometry( 10, 10, 5, 15 );
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+ material = new THREE.MeshLambertMaterial( {
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+ color: 0xff8080
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+ } );
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+ mesh = new THREE.Mesh( geometry, material );
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+ mesh.position.set( - 80, 10, - 70 );
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+ mesh.rotation.x = Math.PI / 2;
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+ scene.add( mesh );
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+
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+ funfairs.push( mesh );
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+
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+ geometry = new THREE.CylinderGeometry( 5, 6, 4, 10 );
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+ material = new THREE.MeshLambertMaterial( {
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+ color: 0x8080ff
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+ } );
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+ mesh = new THREE.Mesh( geometry, material );
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+ mesh.position.set( 50, 2, 30 );
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+ scene.add( mesh );
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+
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+ funfairs.push( mesh );
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+
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+ //
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ //
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+
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+ const position = new THREE.Vector3();
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+ const tangent = new THREE.Vector3();
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+
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+ const lookAt = new THREE.Vector3();
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+
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+ let velocity = 0;
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+ let progress = 0;
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+
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+ let prevTime = performance.now();
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+
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+ function animate() {
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+
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+ const time = performance.now();
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+ const delta = time - prevTime;
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+
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+ for ( let i = 0; i < funfairs.length; i ++ ) {
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+
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+ funfairs[ i ].rotation.y = time * 0.0004;
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+
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+ }
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+
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+ //
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+
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+ progress += velocity;
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+ progress = progress % 1;
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+
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+ position.copy( curve.getPointAt( progress ) );
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+ position.y += 0.3;
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+
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+ train.position.copy( position );
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+
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+ tangent.copy( curve.getTangentAt( progress ) );
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+
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+ velocity -= tangent.y * 0.0000001 * delta;
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+ velocity = Math.max( 0.00004, Math.min( 0.0002, velocity ) );
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+
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+ train.lookAt( lookAt.copy( position ).sub( tangent ) );
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+
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+ //
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+
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+ renderer.render( scene, camera );
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+
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+ prevTime = time;
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Rik Cabanier
