From f76fe4dbc31e1f6c82dd506dcfff507ef969954f Mon Sep 17 00:00:00 2001
From: "Mr.doob" <info@mrdoob.com>
Date: Fri, 4 Mar 2016 19:37:42 +0000
Subject: [PATCH] Added WebVR RollerCoaster example.

---
 examples/files.js                 |   5 +-
 examples/js/RollerCoaster.js      | 544 ++++++++++++++++++++++++++++++
 examples/js/WebVR.js              |  83 +++++
 examples/webvr_rollercoaster.html | 237 +++++++++++++
 4 files changed, 867 insertions(+), 2 deletions(-)
 create mode 100644 examples/js/RollerCoaster.js
 create mode 100644 examples/js/WebVR.js
 create mode 100644 examples/webvr_rollercoaster.html

diff --git a/examples/files.js b/examples/files.js
index 1145a29f4e..f5fe64da97 100644
--- a/examples/files.js
+++ b/examples/files.js
@@ -235,8 +235,9 @@ var files = {
 	],
 	"webvr": [
 		"webvr_cubes",
-		"webvr_video",
-		"webvr_stereo_pano"
+		"webvr_rollercoaster",
+		"webvr_stereo_pano",
+		"webvr_video"
 	],
 	"css3d": [
 		"css3d_molecules",
diff --git a/examples/js/RollerCoaster.js b/examples/js/RollerCoaster.js
new file mode 100644
index 0000000000..b9a280ea4b
--- /dev/null
+++ b/examples/js/RollerCoaster.js
@@ -0,0 +1,544 @@
+/**
+ * @author mrdoob / http://mrdoob.com/
+ */
+
+var RollerCoasterGeometry = function ( curve, size ) {
+
+	THREE.BufferGeometry.call( this );
+
+	var vertices = [];
+	var normals = [];
+	var colors = [];
+
+	var color1 = [ 1, 1, 1 ];
+	var color2 = [ 1, 1, 0 ];
+
+	var up = new THREE.Vector3( 0, 1, 0 );
+	var forward = new THREE.Vector3();
+	var right = new THREE.Vector3();
+
+	var quaternion = new THREE.Quaternion();
+	var prevQuaternion = new THREE.Quaternion();
+	prevQuaternion.setFromAxisAngle( up , Math.PI / 2 );
+
+	var point = new THREE.Vector3();
+	var prevPoint = new THREE.Vector3();
+	prevPoint.copy( curve.getPointAt( 0 ) );
+
+	// shapes
+
+	var step = [
+		new THREE.Vector3( -2.25,  0, 0 ),
+		new THREE.Vector3(  0,  -0.5, 0 ),
+		new THREE.Vector3(  0, -1.75, 0 ),
+
+		new THREE.Vector3(  0,  -0.5, 0 ),
+		new THREE.Vector3(  2.25,  0, 0 ),
+		new THREE.Vector3(  0, -1.75, 0 )
+	];
+
+	var PI2 = Math.PI * 2;
+
+	var sides = 5;
+	var tube1 = [];
+
+	for ( var i = 0; i < sides; i ++ ) {
+
+		var angle = ( i / sides ) * PI2;
+		tube1.push( new THREE.Vector3( Math.sin( angle ) * 0.6, Math.cos( angle ) * 0.6, 0 ) );
+
+	}
+
+	var sides = 6;
+	var tube2 = [];
+
+	for ( var i = 0; i < sides; i ++ ) {
+
+		var angle = ( i / sides ) * PI2;
+		tube2.push( new THREE.Vector3( Math.sin( angle ) * 0.25, Math.cos( angle ) * 0.25, 0 ) );
+
+	}
+
+	var vector = new THREE.Vector3();
+	var normal = new THREE.Vector3();
+
+	var drawShape = function ( shape, color ) {
+
+		normal.set( 0, 0, -1 ).applyQuaternion( quaternion );
+
+		for ( var j = 0; j < shape.length; j ++ ) {
+
+			vector.copy( shape[ j ] );
+			vector.applyQuaternion( quaternion );
+			vector.add( point );
+
+			vertices.push( vector.x, vector.y, vector.z );
+			normals.push( normal.x, normal.y, normal.z );
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+
+		}
+
+		normal.set( 0, 0, 1 ).applyQuaternion( quaternion );
+
+		for ( var j = shape.length - 1; j >= 0; j -- ) {
+
+			vector.copy( shape[ j ] );
+			vector.applyQuaternion( quaternion );
+			vector.add( point );
+
+			vertices.push( vector.x, vector.y, vector.z );
+			normals.push( normal.x, normal.y, normal.z );
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+
+		}
+
+	};
+
+	var vector1 = new THREE.Vector3();
+	var vector2 = new THREE.Vector3();
+	var vector3 = new THREE.Vector3();
+	var vector4 = new THREE.Vector3();
+
+	var normal1 = new THREE.Vector3();
+	var normal2 = new THREE.Vector3();
+	var normal3 = new THREE.Vector3();
+	var normal4 = new THREE.Vector3();
+
+	var extrudeShape = function ( shape, offset, color ) {
+
+		for ( var j = 0, jl = shape.length; j < jl; j ++ ) {
+
+			var point1 = shape[ j ];
+			var point2 = shape[ ( j + 1 ) % jl ];
+
+			vector1.copy( point1 ).add( offset );
+			vector1.applyQuaternion( quaternion );
+			vector1.add( point );
+
+			vector2.copy( point2 ).add( offset );
+			vector2.applyQuaternion( quaternion );
+			vector2.add( point );
+
+			vector3.copy( point2 ).add( offset );
+			vector3.applyQuaternion( prevQuaternion );
+			vector3.add( prevPoint );
+
+			vector4.copy( point1 ).add( offset );
+			vector4.applyQuaternion( prevQuaternion );
+			vector4.add( prevPoint );
+
+			vertices.push( vector1.x, vector1.y, vector1.z );
+			vertices.push( vector2.x, vector2.y, vector2.z );
+			vertices.push( vector4.x, vector4.y, vector4.z );
+
+			vertices.push( vector2.x, vector2.y, vector2.z );
+			vertices.push( vector3.x, vector3.y, vector3.z );
+			vertices.push( vector4.x, vector4.y, vector4.z );
+
+			//
+
+			normal1.copy( point1 );
+			normal1.applyQuaternion( quaternion );
+			normal1.normalize();
+
+			normal2.copy( point2 );
+			normal2.applyQuaternion( quaternion );
+			normal2.normalize();
+
+			normal3.copy( point2 );
+			normal3.applyQuaternion( prevQuaternion );
+			normal3.normalize();
+
+			normal4.copy( point1 );
+			normal4.applyQuaternion( prevQuaternion );
+			normal4.normalize();
+
+			normals.push( normal1.x, normal1.y, normal1.z );
+			normals.push( normal2.x, normal2.y, normal2.z );
+			normals.push( normal4.x, normal4.y, normal4.z );
+
+			normals.push( normal2.x, normal2.y, normal2.z );
+			normals.push( normal3.x, normal3.y, normal3.z );
+			normals.push( normal4.x, normal4.y, normal4.z );
+
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+			colors.push( color[ 0 ], color[ 1 ], color[ 2 ] );
+
+		}
+
+	};
+
+	var offset = new THREE.Vector3();
+
+	for ( var i = 1; i <= size; i ++ ) {
+
+		point.copy( curve.getPointAt( i / size ) );
+
+		up.set( 0, 1, 0 );
+
+		forward.subVectors( point, prevPoint ).normalize();
+		right.crossVectors( up, forward ).normalize();
+		up.crossVectors( forward, right );
+
+		var angle = Math.atan2( forward.x, forward.z );
+
+		quaternion.setFromAxisAngle( up, angle );
+
+		if ( i % 2 === 0 ) {
+
+			drawShape( step, color2 );
+
+		}
+
+		extrudeShape( tube1, offset.set( 0, -1.25, 0 ), color2 );
+		extrudeShape( tube2, offset.set( 2, 0, 0 ), color1 );
+		extrudeShape( tube2, offset.set( -2, 0, 0 ), color1 );
+
+		prevPoint.copy( point );
+		prevQuaternion.copy( quaternion );
+
+	}
+
+	// console.log( vertices.length );
+
+	this.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) );
+	this.addAttribute( 'normal', new THREE.BufferAttribute( new Float32Array( normals ), 3 ) );
+	this.addAttribute( 'color', new THREE.BufferAttribute( new Float32Array( colors ), 3 ) );
+
+};
+
+RollerCoasterGeometry.prototype = Object.create( THREE.BufferGeometry.prototype );
+
+var RollerCoasterLiftersGeometry = function ( curve, size ) {
+
+	THREE.BufferGeometry.call( this );
+
+	var vertices = [];
+	var normals = [];
+
+	var quaternion = new THREE.Quaternion();
+
+	var up = new THREE.Vector3( 0, 1, 0 );
+
+	var point = new THREE.Vector3();
+	var tangent = new THREE.Vector3();
+
+	// shapes
+
+	var tube1 = [
+		new THREE.Vector3(  0,  0.5, -0.5 ),
+		new THREE.Vector3(  0,  0.5,  0.5 ),
+		new THREE.Vector3(  0, -0.5,  0 )
+	];
+
+	var tube2 = [
+		new THREE.Vector3( -0.5, 0,  0.5 ),
+		new THREE.Vector3( -0.5, 0, -0.5 ),
+		new THREE.Vector3(  0.5, 0,  0 )
+	];
+
+	var tube3 = [
+		new THREE.Vector3(  0.5, 0, -0.5 ),
+		new THREE.Vector3(  0.5, 0,  0.5 ),
+		new THREE.Vector3( -0.5, 0,  0 )
+	];
+
+	var vector1 = new THREE.Vector3();
+	var vector2 = new THREE.Vector3();
+	var vector3 = new THREE.Vector3();
+	var vector4 = new THREE.Vector3();
+
+	var normal1 = new THREE.Vector3();
+	var normal2 = new THREE.Vector3();
+	var normal3 = new THREE.Vector3();
+	var normal4 = new THREE.Vector3();
+
+	var extrudeShape = function ( shape, fromPoint, toPoint ) {
+
+		for ( var j = 0, jl = shape.length; j < jl; j ++ ) {
+
+			var point1 = shape[ j ];
+			var point2 = shape[ ( j + 1 ) % jl ];
+
+			vector1.copy( point1 )
+			vector1.applyQuaternion( quaternion );
+			vector1.add( fromPoint );
+
+			vector2.copy( point2 )
+			vector2.applyQuaternion( quaternion );
+			vector2.add( fromPoint );
+
+			vector3.copy( point2 )
+			vector3.applyQuaternion( quaternion );
+			vector3.add( toPoint );
+
+			vector4.copy( point1 )
+			vector4.applyQuaternion( quaternion );
+			vector4.add( toPoint );
+
+			vertices.push( vector1.x, vector1.y, vector1.z );
+			vertices.push( vector2.x, vector2.y, vector2.z );
+			vertices.push( vector4.x, vector4.y, vector4.z );
+
+			vertices.push( vector2.x, vector2.y, vector2.z );
+			vertices.push( vector3.x, vector3.y, vector3.z );
+			vertices.push( vector4.x, vector4.y, vector4.z );
+
+			//
+
+			normal1.copy( point1 );
+			normal1.applyQuaternion( quaternion );
+			normal1.normalize();
+
+			normal2.copy( point2 );
+			normal2.applyQuaternion( quaternion );
+			normal2.normalize();
+
+			normal3.copy( point2 );
+			normal3.applyQuaternion( quaternion );
+			normal3.normalize();
+
+			normal4.copy( point1 );
+			normal4.applyQuaternion( quaternion );
+			normal4.normalize();
+
+			normals.push( normal1.x, normal1.y, normal1.z );
+			normals.push( normal2.x, normal2.y, normal2.z );
+			normals.push( normal4.x, normal4.y, normal4.z );
+
+			normals.push( normal2.x, normal2.y, normal2.z );
+			normals.push( normal3.x, normal3.y, normal3.z );
+			normals.push( normal4.x, normal4.y, normal4.z );
+
+		}
+
+	};
+
+	var fromPoint = new THREE.Vector3();
+	var toPoint = new THREE.Vector3();
+
+	for ( var i = 1; i <= size; i ++ ) {
+
+		point.copy( curve.getPointAt( i / size ) );
+		tangent.copy( curve.getTangentAt( i / size ) );
+
+		var angle = Math.atan2( tangent.x, tangent.z );
+
+		quaternion.setFromAxisAngle( up, angle );
+
+		//
+
+		if ( point.y > 100 ) {
+
+			fromPoint.set( -7.5, -3.5, 0 );
+			fromPoint.applyQuaternion( quaternion );
+			fromPoint.add( point );
+
+			toPoint.set( 7.5, -3.5, 0 );
+			toPoint.applyQuaternion( quaternion );
+			toPoint.add( point );
+
+			extrudeShape( tube1, fromPoint, toPoint );
+
+			fromPoint.set( -7, -3, 0 );
+			fromPoint.applyQuaternion( quaternion );
+			fromPoint.add( point );
+
+			toPoint.set( -7, -point.y, 0 );
+			toPoint.applyQuaternion( quaternion );
+			toPoint.add( point );
+
+			extrudeShape( tube2, fromPoint, toPoint );
+
+			fromPoint.set( 7, -3, 0 );
+			fromPoint.applyQuaternion( quaternion );
+			fromPoint.add( point );
+
+			toPoint.set( 7, -point.y, 0 );
+			toPoint.applyQuaternion( quaternion );
+			toPoint.add( point );
+
+			extrudeShape( tube3, fromPoint, toPoint );
+
+		} else {
+
+			fromPoint.set( 0, -2, 0 );
+			fromPoint.applyQuaternion( quaternion );
+			fromPoint.add( point );
+
+			toPoint.set( 0, -point.y, 0 );
+			toPoint.applyQuaternion( quaternion );
+			toPoint.add( point );
+
+			extrudeShape( tube3, fromPoint, toPoint );
+
+		}
+
+	}
+
+	this.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) );
+	this.addAttribute( 'normal', new THREE.BufferAttribute( new Float32Array( normals ), 3 ) );
+
+};
+
+RollerCoasterLiftersGeometry.prototype = Object.create( THREE.BufferGeometry.prototype );
+
+var RollerCoasterShadowGeometry = function ( curve, size ) {
+
+	THREE.BufferGeometry.call( this );
+
+	var vertices = [];
+
+	var up = new THREE.Vector3( 0, 1, 0 );
+	var forward = new THREE.Vector3();
+
+	var quaternion = new THREE.Quaternion();
+	var prevQuaternion = new THREE.Quaternion();
+	prevQuaternion.setFromAxisAngle( up , Math.PI / 2 );
+
+	var point = new THREE.Vector3();
+
+	var prevPoint = new THREE.Vector3();
+	prevPoint.copy( curve.getPointAt( 0 ) );
+	prevPoint.y = 0;
+
+	var vector1 = new THREE.Vector3();
+	var vector2 = new THREE.Vector3();
+	var vector3 = new THREE.Vector3();
+	var vector4 = new THREE.Vector3();
+
+	for ( var i = 1; i <= size; i ++ ) {
+
+		point.copy( curve.getPointAt( i / size ) );
+		point.y = 0;
+
+		forward.subVectors( point, prevPoint );
+
+		var angle = Math.atan2( forward.x, forward.z );
+
+		quaternion.setFromAxisAngle( up, angle );
+
+		vector1.set( -3, 0, 0 );
+		vector1.applyQuaternion( quaternion );
+		vector1.add( point );
+
+		vector2.set(  3, 0, 0 );
+		vector2.applyQuaternion( quaternion );
+		vector2.add( point );
+
+		vector3.set(  3, 0, 0 );
+		vector3.applyQuaternion( prevQuaternion );
+		vector3.add( prevPoint );
+
+		vector4.set( -3, 0, 0 );
+		vector4.applyQuaternion( prevQuaternion );
+		vector4.add( prevPoint );
+
+		vertices.push( vector1.x, vector1.y, vector1.z );
+		vertices.push( vector2.x, vector2.y, vector2.z );
+		vertices.push( vector4.x, vector4.y, vector4.z );
+
+		vertices.push( vector2.x, vector2.y, vector2.z );
+		vertices.push( vector3.x, vector3.y, vector3.z );
+		vertices.push( vector4.x, vector4.y, vector4.z );
+
+		prevPoint.copy( point );
+		prevQuaternion.copy( quaternion );
+
+	}
+
+	this.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) );
+
+};
+
+RollerCoasterShadowGeometry.prototype = Object.create( THREE.BufferGeometry.prototype );
+
+var SkyGeometry = function () {
+
+	THREE.BufferGeometry.call( this );
+
+	var vertices = [];
+
+	for ( var i = 0; i < 100; i ++ ) {
+
+		var x = Math.random() * 8000 - 4000;
+		var y = Math.random() * 500 + 500;
+		var z = Math.random() * 8000 - 4000;
+
+		var size = Math.random() * 400 + 200;
+
+		vertices.push( x - size, y, z - size );
+		vertices.push( x + size, y, z - size );
+		vertices.push( x - size, y, z + size );
+
+		vertices.push( x + size, y, z - size );
+		vertices.push( x + size, y, z + size );
+		vertices.push( x - size, y, z + size );
+
+	}
+
+
+	this.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) );
+
+};
+
+SkyGeometry.prototype = Object.create( THREE.BufferGeometry.prototype );
+
+var TreesGeometry = function ( landscape ) {
+
+	THREE.BufferGeometry.call( this );
+
+	var vertices = [];
+	var colors = [];
+
+	var raycaster = new THREE.Raycaster();
+	raycaster.ray.direction.set( 0, -1, 0 );
+
+	for ( var i = 0; i < 2000; i ++ ) {
+
+		var x = Math.random() * 5000 - 2500;
+		var z = Math.random() * 5000 - 2500;
+
+		raycaster.ray.origin.set( x, 500, z );
+
+		var intersections = raycaster.intersectObject( landscape );
+
+		if ( intersections.length === 0 ) continue;
+
+		var y = intersections[ 0 ].point.y;
+
+		var height = Math.random() * 50 + 5;
+
+		var angle = Math.random() * Math.PI * 2;
+
+		vertices.push( x + Math.sin( angle ) * 10, y, z + Math.cos( angle ) * 10 );
+		vertices.push( x, y + height, z );
+		vertices.push( x + Math.sin( angle + Math.PI ) * 10, y, z + Math.cos( angle + Math.PI ) * 10 );
+
+		angle += Math.PI / 2;
+
+		vertices.push( x + Math.sin( angle ) * 10, y, z + Math.cos( angle ) * 10 );
+		vertices.push( x, y + height, z );
+		vertices.push( x + Math.sin( angle + Math.PI ) * 10, y, z + Math.cos( angle + Math.PI ) * 10 );
+
+		var random = Math.random() * 0.1;
+
+		for ( var j = 0; j < 6; j ++ ) {
+
+			colors.push( 0.2 + random, 0.4 + random, 0 );
+
+		}
+
+	}
+
+	this.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( vertices ), 3 ) );
+	this.addAttribute( 'color', new THREE.BufferAttribute( new Float32Array( colors ), 3 ) );
+
+};
+
+TreesGeometry.prototype = Object.create( THREE.BufferGeometry.prototype );
diff --git a/examples/js/WebVR.js b/examples/js/WebVR.js
new file mode 100644
index 0000000000..29f7c53961
--- /dev/null
+++ b/examples/js/WebVR.js
@@ -0,0 +1,83 @@
+/**
+ * @author mrdoob / http://mrdoob.com
+ * Based on @tojiro's vr-samples-utils.js
+ */
+
+var WEBVR = {
+
+	button: function ( effect ) {
+
+		var button = document.createElement( 'button' );
+		button.style.position = 'absolute';
+		button.style.left = 'calc(50% - 30px)';
+		button.style.bottom = '20px';
+		button.style.border = '0';
+		button.style.padding = '8px';
+		button.style.cursor = 'pointer';
+		button.style.backgroundColor = '#000';
+		button.style.color = '#fff';
+		button.style.fontFamily = 'sans-serif';
+		button.style.fontSize = '13px';
+		button.style.fontStyle = 'normal';
+		button.style.zIndex = '999';
+		button.textContent = 'ENTER VR';
+		button.onclick = function() {
+
+			effect.setFullScreen( true );
+
+		};
+		document.body.appendChild( button );
+
+	},
+
+	test: function () {
+
+		var message;
+
+		if ( navigator.getVRDisplays ) {
+
+			navigator.getVRDisplays().then( function ( displays ) {
+
+				if ( displays.length === 0 ) message = 'WebVR supported, but no VRDisplays found.';
+
+			} );
+
+		} else if ( navigator.getVRDevices ) {
+
+			message = 'Your browser supports WebVR but not the latest version. See <a href="http://webvr.info">webvr.info</a> for more info.';
+
+		} else {
+
+			message = 'Your browser does not support WebVR. See <a href="http://webvr.info">webvr.info</a> for assistance.';
+
+		}
+
+		if ( message !== undefined ) {
+
+			var container = document.createElement( 'div' );
+			container.style.position = 'absolute';
+			container.style.left = '0';
+			container.style.top = '0';
+			container.style.right = '0';
+			container.style.zIndex = '999';
+			container.align = 'center';
+			document.body.appendChild( container );
+
+			var error = document.createElement( 'div' );
+			error.style.fontFamily = 'sans-serif';
+			error.style.fontSize = '16px';
+			error.style.fontStyle = 'normal';
+			error.style.lineHeight = '26px';
+			error.style.backgroundColor = '#fff';
+			error.style.color = '#000';
+			error.style.padding = '10px 20px';
+			error.style.margin = '40px';
+			error.style.display = 'inline-block';
+			error.innerHTML = message;
+			container.appendChild( error );
+
+		}
+
+	}
+
+};
diff --git a/examples/webvr_rollercoaster.html b/examples/webvr_rollercoaster.html
new file mode 100644
index 0000000000..4e372d9121
--- /dev/null
+++ b/examples/webvr_rollercoaster.html
@@ -0,0 +1,237 @@
+<html>
+	<head>
+		<meta charset="utf-8">
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
+		<title>Roller Coaster</title>
+		<style>
+			body {
+				margin: 0px;
+				color: #fff;
+				font-family: Monospace;
+				background-color: #444;
+				overflow: hidden;
+			}
+			a {
+				color: #00f;
+			}
+		</style>
+	</head>
+	<body>
+
+		<script src="../build/three.min.js"></script>
+
+		<script src="js/RollerCoaster.js"></script>
+
+		<script src="js/WebVR.js"></script>
+		<script src="js/effects/VREffect.js"></script>
+		<script src="js/controls/VRControls.js"></script>
+
+		<script>
+
+			WEBVR.test();
+
+			//
+
+			var renderer = new THREE.WebGLRenderer( { antialias: true } );
+			renderer.setClearColor( 0xf0f0ff );
+			renderer.setSize( window.innerWidth, window.innerHeight );
+			document.body.appendChild( renderer.domElement );
+
+			var scene = new THREE.Scene();
+
+			var light = new THREE.HemisphereLight( 0xfff0f0, 0x606066 );
+			light.position.set( 1, 1, 1 );
+			scene.add( light );
+
+			var train = new THREE.Object3D();
+			scene.add( train );
+
+			var camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 5000 );
+			camera.rotation.y = Math.PI;
+			train.add( camera );
+
+			// environment
+
+			var geometry = new THREE.PlaneGeometry( 5000, 5000, 15, 15 );
+			geometry.applyMatrix( new THREE.Matrix4().makeRotationX( - Math.PI / 2 ) );
+			var material = new THREE.MeshLambertMaterial( { color: 0x407000, shading: THREE.FlatShading } );
+
+			for ( var i = 0; i < geometry.vertices.length; i ++ ) {
+
+				var vertex = geometry.vertices[ i ];
+
+				vertex.x += Math.random() * 100 - 50;
+				vertex.z += Math.random() * 100 - 50;
+
+				var distance = ( vertex.distanceTo( scene.position ) / 5 ) - 250;
+
+				vertex.y = Math.random() * Math.max( 0, distance );
+
+			}
+
+			geometry.computeFaceNormals();
+
+			var mesh = new THREE.Mesh( geometry, material );
+			scene.add( mesh );
+
+			var geometry = new TreesGeometry( mesh );
+			var material = new THREE.MeshBasicMaterial( { side: THREE.DoubleSide, vertexColors: THREE.VertexColors } );
+			var mesh = new THREE.Mesh( geometry, material );
+			scene.add( mesh );
+
+			var geometry = new SkyGeometry();
+			var material = new THREE.MeshBasicMaterial( { color: 0xffffff } );
+			var mesh = new THREE.Mesh( geometry, material );
+			scene.add( mesh );
+
+			//
+
+			var PI2 = Math.PI * 2;
+
+			var curve = ( function () {
+
+				var vector = new THREE.Vector3();
+				var vector2 = new THREE.Vector3();
+
+				return {
+
+					getPointAt: function ( t ) {
+
+						t = t * PI2;
+
+						var x = Math.sin( t * 3 ) * Math.cos( t * 4 ) * 50;
+						var y = Math.cos( t * 8 ) * 4 + Math.cos( t * 17 ) + 5;
+						var z = Math.sin( t ) * Math.sin( t * 4 ) * 50;
+
+						return vector.set( x, y, z ).multiplyScalar( 20 );
+
+					},
+
+					getTangentAt: function ( t ) {
+
+						var delta = 0.0001;
+						var t1 = Math.max( 0, t - delta );
+						var t2 = Math.min( 1, t + delta );
+
+						return vector2.copy( this.getPointAt ( t2 ) ).sub( this.getPointAt( t1 ) ).normalize();
+
+					}
+
+				};
+
+			} )();
+
+			var geometry = new RollerCoasterGeometry( curve, 1500 );
+			var material = new THREE.MeshStandardMaterial( {
+				roughness: 0.1,
+				metalness: 0,
+				vertexColors: THREE.VertexColors
+			} );
+			var mesh = new THREE.Mesh( geometry, material );
+			scene.add( mesh );
+
+			var geometry = new RollerCoasterLiftersGeometry( curve, 100 );
+			var material = new THREE.MeshStandardMaterial( {
+				roughness: 0.1,
+				metalness: 0
+			} );
+			var mesh = new THREE.Mesh( geometry, material );
+			mesh.position.y = 1;
+			scene.add( mesh );
+
+			var geometry = new RollerCoasterShadowGeometry( curve, 500 );
+			var material = new THREE.MeshBasicMaterial( { color: 0x000000, opacity: 0.1, depthWrite: false, transparent: true } );
+			var mesh = new THREE.Mesh( geometry, material );
+			mesh.position.y = 1;
+			scene.add( mesh );
+
+			var funfairs = [];
+
+			//
+
+			var geometry = new THREE.CylinderGeometry( 100, 100, 50, 15 );
+			var material = new THREE.MeshLambertMaterial( { color: 0xff8080, shading: THREE.FlatShading } );
+			var mesh = new THREE.Mesh( geometry, material );
+			mesh.position.set( - 800, 100, - 700 );
+			mesh.rotation.x = Math.PI / 2;
+			scene.add( mesh );
+
+			funfairs.push( mesh );
+
+			var geometry = new THREE.CylinderGeometry( 50, 60, 40, 10 );
+			var material = new THREE.MeshLambertMaterial( { color: 0x8080ff, shading: THREE.FlatShading } );
+			var mesh = new THREE.Mesh( geometry, material );
+			mesh.position.set( 500, 20, 300 );
+			scene.add( mesh );
+
+			funfairs.push( mesh );
+
+			//
+
+			var effect = new THREE.VREffect( renderer );
+			var controls = new THREE.VRControls( camera );
+
+			WEBVR.button( effect );
+
+			//
+
+			window.addEventListener( 'resize', function () {
+
+				camera.aspect = window.innerWidth / window.innerHeight;
+				camera.updateProjectionMatrix();
+
+				renderer.setSize( window.innerWidth, window.innerHeight );
+
+			}, false );
+
+			//
+
+			var position = new THREE.Vector3();
+			var tangent = new THREE.Vector3();
+
+			var lookAt = new THREE.Vector3();
+
+			var velocity = 0;
+			var progress = 0;
+
+			var animate = function ( time ) {
+
+				requestAnimationFrame( animate );
+
+				for ( var i = 0; i < funfairs.length; i ++ ) {
+
+					funfairs[ i ].rotation.y = time * 0.0002;
+
+				}
+
+				//
+
+				progress += velocity;
+				progress = progress % 1;
+
+				position.copy( curve.getPointAt( progress ) );
+				position.y += 3;
+
+				train.position.copy( position );
+
+				tangent.copy( curve.getTangentAt( progress ) );
+
+				velocity -= tangent.y * 0.0000015;
+				velocity = Math.max( velocity, 0.00004 );
+
+				train.lookAt( lookAt.copy( position ).add( tangent ) );
+
+				//
+
+				controls.update();
+
+				effect.render( scene, camera );
+
+			};
+
+			requestAnimationFrame( animate );
+
+		</script>
+
+	</body>
+</html>
-- 
GitLab