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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - geometry - catmull spline editor</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}
			#info {
				position: absolute;
				top: 0px;
				width: 100%;
				padding: 5px;
				font-family:Monospace;
				font-size:13px;
				text-align:center;
			}
		</style>
	</head>
	<body>

		<div id="container"></div>
		<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - geometry - catmull spline editor</div>

		<script src="./node_modules/three/build/three.min.js"></script>

		<script src="./node_modules/three/examples/js/controls/DragControls.js"></script>
		<script src="./node_modules/three/examples/js/controls/OrbitControls.js"></script>
		<script src="./node_modules/three/examples/js/controls/TransformControls.js"></script>

		<script src="./node_modules/three/examples/js/libs/stats.min.js"></script>
		<script src="./node_modules/three/examples/js/libs/dat.gui.min.js"></script>

		<script>
			String.prototype.format = function () {
				var str = this;
				for ( var i = 0; i < arguments.length; i ++ ) {
					str = str.replace( '{' + i + '}', arguments[ i ] );
				}
				return str;
			};
			var container, stats;
			var camera, scene, renderer;
			var splineHelperObjects = [], splineOutline;
			var splinePointsLength = 4;
			var positions = [];
			var point = new THREE.Vector3();
			var options;
			var geometry = new THREE.BoxBufferGeometry( 20, 20, 20 );
			var transformControl;
			var ARC_SEGMENTS = 200;
			var splines = {};
			var params = {
				uniform: true,
				tension: 0.5,
				centripetal: true,
				chordal: true,
				addPoint: addPoint,
				removePoint: removePoint,
				exportSpline: exportSpline
			};
			init();
			animate();
			function init() {
				container = document.getElementById( 'container' );
				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xf0f0f0 );
				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.set( 0, 250, 1000 );
                scene.add( camera );
                
                scene.add( new THREE.AmbientLight( 0xf0f0f0 ) );
                
				var light = new THREE.SpotLight( 0xffffff, 1.5 );
				light.position.set( 0, 1500, 200 );
				light.castShadow = true;
				light.shadow = new THREE.LightShadow( new THREE.PerspectiveCamera( 70, 1, 200, 2000 ) );
				light.shadow.bias = -0.000222;
				light.shadow.mapSize.width = 1024;
				light.shadow.mapSize.height = 1024;
                scene.add( light );
                
                spotlight = light;
                
				var planeGeometry = new THREE.PlaneBufferGeometry( 2000, 2000 );
				planeGeometry.rotateX( - Math.PI / 2 );
				var planeMaterial = new THREE.ShadowMaterial( { opacity: 0.2 } );
				var plane = new THREE.Mesh( planeGeometry, planeMaterial );
				plane.position.y = -200;
				plane.receiveShadow = true;
                scene.add( plane );
                
				var helper = new THREE.GridHelper( 2000, 100 );
				helper.position.y = - 199;
				helper.material.opacity = 0.25;
				helper.material.transparent = true;
                scene.add( helper );
                
				//var axes = new THREE.AxesHelper( 1000 );
				//axes.position.set( - 500, - 500, - 500 );
				//scene.add( axes );
				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.shadowMap.enabled = true;
				container.appendChild( renderer.domElement );
				stats = new Stats();
				container.appendChild( stats.dom );
				var gui = new dat.GUI();
				gui.add( params, 'uniform' );
				gui.add( params, 'tension', 0, 1 ).step( 0.01 ).onChange( function( value ) {
					splines.uniform.tension = value;
					updateSplineOutline();
				});
				gui.add( params, 'centripetal' );
				gui.add( params, 'chordal' );
				gui.add( params, 'addPoint' );
				gui.add( params, 'removePoint' );
				gui.add( params, 'exportSpline' );
                gui.open();
                
				// Controls
				var controls = new THREE.OrbitControls( camera, renderer.domElement );
				controls.damping = 0.2;
				controls.addEventListener( 'change', render );
				controls.addEventListener( 'start', function() {
					cancelHideTransorm();
				} );
				controls.addEventListener( 'end', function() {
					delayHideTransform();
				} );
				transformControl = new THREE.TransformControls( camera, renderer.domElement );
				transformControl.addEventListener( 'change', render );
				scene.add( transformControl );
				// Hiding transform situation is a little in a mess :()
				transformControl.addEventListener( 'change', function( e ) {
					cancelHideTransorm();
				} );
				transformControl.addEventListener( 'mouseDown', function( e ) {
					cancelHideTransorm();
				} );
				transformControl.addEventListener( 'mouseUp', function( e ) {
					delayHideTransform();
				} );
				transformControl.addEventListener( 'objectChange', function( e ) {
					updateSplineOutline();
                } );
                
				var dragcontrols = new THREE.DragControls( splineHelperObjects, camera, renderer.domElement ); //
				dragcontrols.enabled = false;
				dragcontrols.addEventListener( 'hoveron', function ( event ) {
					transformControl.attach( event.object );
					cancelHideTransorm();
				} );
				dragcontrols.addEventListener( 'hoveroff', function ( event ) {
					delayHideTransform();
				} );
				var hiding;
				function delayHideTransform() {
					cancelHideTransorm();
					hideTransform();
				}
				function hideTransform() {
					hiding = setTimeout( function() {
						transformControl.detach( transformControl.object );
					}, 2500 )
				}
				function cancelHideTransorm() {
					if ( hiding ) clearTimeout( hiding );
				}
				/*******
				 * Curves
				 *********/
				for ( var i = 0; i < splinePointsLength; i ++ ) {
					addSplineObject( positions[ i ] );
				}
				positions = [];
				for ( var i = 0; i < splinePointsLength; i ++ ) {
					positions.push( splineHelperObjects[ i ].position );
				}
				var geometry = new THREE.BufferGeometry();
				geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( ARC_SEGMENTS * 3 ), 3 ) );
				var curve = new THREE.CatmullRomCurve3( positions );
				curve.curveType = 'catmullrom';
				curve.mesh = new THREE.Line( geometry.clone(), new THREE.LineBasicMaterial( {
					color: 0xff0000,
					opacity: 0.35,
					linewidth: 2
					} ) );
				curve.mesh.castShadow = true;
				splines.uniform = curve;
				curve = new THREE.CatmullRomCurve3( positions );
				curve.curveType = 'centripetal';
				curve.mesh = new THREE.Line( geometry.clone(), new THREE.LineBasicMaterial( {
					color: 0x00ff00,
					opacity: 0.35,
					linewidth: 2
					} ) );
				curve.mesh.castShadow = true;
				splines.centripetal = curve;
				curve = new THREE.CatmullRomCurve3( positions );
				curve.curveType = 'chordal';
				curve.mesh = new THREE.Line( geometry.clone(), new THREE.LineBasicMaterial( {
					color: 0x0000ff,
					opacity: 0.35,
					linewidth: 2
					} ) );
				curve.mesh.castShadow = true;
				splines.chordal = curve;
				for ( var k in splines ) {
					var spline = splines[ k ];
					scene.add( spline.mesh );
				}
				load( [ new THREE.Vector3( 289.76843686945404, 452.51481137238443, 56.10018915737797 ),
						new THREE.Vector3( -53.56300074753207, 171.49711742836848, -14.495472686253045 ),
						new THREE.Vector3( -91.40118730204415, 176.4306956436485, -6.958271935582161 ),
						new THREE.Vector3( -383.785318791128, 491.1365363371675, 47.869296953772746 ) ] );
			}
			function addSplineObject( position ) {
				var material = new THREE.MeshLambertMaterial( { color: Math.random() * 0xffffff } );
				var object = new THREE.Mesh( geometry, material );
				if ( position ) {
					object.position.copy( position );
				} else {
					object.position.x = Math.random() * 1000 - 500;
					object.position.y = Math.random() * 600;
					object.position.z = Math.random() * 800 - 400;
				}
				object.castShadow = true;
				object.receiveShadow = true;
				scene.add( object );
				splineHelperObjects.push( object );
				return object;
			}
			function addPoint() {
				splinePointsLength ++;
				positions.push( addSplineObject().position );
				updateSplineOutline();
			}
			function removePoint() {
				if ( splinePointsLength <= 4 ) {
					return;
				}
				splinePointsLength --;
				positions.pop();
				scene.remove( splineHelperObjects.pop() );
				updateSplineOutline();
			}
			function updateSplineOutline() {
				for ( var k in splines ) {
					var spline = splines[ k ];
					var splineMesh = spline.mesh;
					var position = splineMesh.geometry.attributes.position;
					for ( var i = 0; i < ARC_SEGMENTS; i ++ ) {
						var t = i /  ( ARC_SEGMENTS - 1 );
						spline.getPoint( t, point );
						position.setXYZ( i, point.x, point.y, point.z );
					}
					position.needsUpdate = true;
				}
			}
			function exportSpline() {
				var strplace = [];
				for ( var i = 0; i < splinePointsLength; i ++ ) {
					var p = splineHelperObjects[ i ].position;
					strplace.push( 'new THREE.Vector3({0}, {1}, {2})'.format( p.x, p.y, p.z ) )
				}
				console.log( strplace.join( ',\n' ) );
				var code = '[' + ( strplace.join( ',\n\t' ) ) + ']';
				prompt( 'copy and paste code', code );
			}
			function load( new_positions ) {
				while ( new_positions.length > positions.length ) {
					addPoint();
				}
				while ( new_positions.length < positions.length ) {
					removePoint();
				}
				for ( var i = 0; i < positions.length; i ++ ) {
					positions[ i ].copy( new_positions[ i ] );
				}
				updateSplineOutline();
			}
			function animate() {
				requestAnimationFrame( animate );
				render();
				stats.update();
				transformControl.update();
			}
			function render() {
				splines.uniform.mesh.visible = params.uniform;
				splines.centripetal.mesh.visible = params.centripetal;
				splines.chordal.mesh.visible = params.chordal;
				renderer.render( scene, camera );
			}
		</script>

	</body>
</html>