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webgl_geometry_extrude_splines.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - geometry - spline extrusion</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 - spline extrusion examples by <a href="http://www.lab4games.net/zz85/blog" target="_blank" rel="noopener">zz85</a></div>
<script src="../build/three.js"></script>
<script src="js/controls/OrbitControls.js"></script>
<!-- where curves formulas are defined -->
<script src="js/CurveExtras.js"></script>
<script src="js/libs/stats.min.js"></script>
<script src="js/libs/dat.gui.min.js"></script>
<script>
var container, stats;
var camera, scene, renderer, splineCamera, cameraHelper, cameraEye;
var binormal = new THREE.Vector3();
var normal = new THREE.Vector3();
var pipeSpline = new THREE.CatmullRomCurve3( [
new THREE.Vector3( 0, 10, - 10 ), new THREE.Vector3( 10, 0, - 10 ),
new THREE.Vector3( 20, 0, 0 ), new THREE.Vector3( 30, 0, 10 ),
new THREE.Vector3( 30, 0, 20 ), new THREE.Vector3( 20, 0, 30 ),
new THREE.Vector3( 10, 0, 30 ), new THREE.Vector3( 0, 0, 30 ),
new THREE.Vector3( - 10, 10, 30 ), new THREE.Vector3( - 10, 20, 30 ),
new THREE.Vector3( 0, 30, 30 ), new THREE.Vector3( 10, 30, 30 ),
new THREE.Vector3( 20, 30, 15 ), new THREE.Vector3( 10, 30, 10 ),
new THREE.Vector3( 0, 30, 10 ), new THREE.Vector3( - 10, 20, 10 ),
new THREE.Vector3( - 10, 10, 10 ), new THREE.Vector3( 0, 0, 10 ),
new THREE.Vector3( 10, - 10, 10 ), new THREE.Vector3( 20, - 15, 10 ),
new THREE.Vector3( 30, - 15, 10 ), new THREE.Vector3( 40, - 15, 10 ),
new THREE.Vector3( 50, - 15, 10 ), new THREE.Vector3( 60, 0, 10 ),
new THREE.Vector3( 70, 0, 0 ), new THREE.Vector3( 80, 0, 0 ),
new THREE.Vector3( 90, 0, 0 ), new THREE.Vector3( 100, 0, 0 )
] );
var sampleClosedSpline = new THREE.CatmullRomCurve3( [
new THREE.Vector3( 0, - 40, - 40 ),
new THREE.Vector3( 0, 40, - 40 ),
new THREE.Vector3( 0, 140, - 40 ),
new THREE.Vector3( 0, 40, 40 ),
new THREE.Vector3( 0, - 40, 40 )
] );
sampleClosedSpline.curveType = 'catmullrom';
sampleClosedSpline.closed = true;
// Keep a dictionary of Curve instances
var splines = {
GrannyKnot: new THREE.Curves.GrannyKnot(),
HeartCurve: new THREE.Curves.HeartCurve( 3.5 ),
VivianiCurve: new THREE.Curves.VivianiCurve( 70 ),
KnotCurve: new THREE.Curves.KnotCurve(),
HelixCurve: new THREE.Curves.HelixCurve(),
TrefoilKnot: new THREE.Curves.TrefoilKnot(),
TorusKnot: new THREE.Curves.TorusKnot( 20 ),
CinquefoilKnot: new THREE.Curves.CinquefoilKnot( 20 ),
TrefoilPolynomialKnot: new THREE.Curves.TrefoilPolynomialKnot( 14 ),
FigureEightPolynomialKnot: new THREE.Curves.FigureEightPolynomialKnot(),
DecoratedTorusKnot4a: new THREE.Curves.DecoratedTorusKnot4a(),
DecoratedTorusKnot4b: new THREE.Curves.DecoratedTorusKnot4b(),
DecoratedTorusKnot5a: new THREE.Curves.DecoratedTorusKnot5a(),
DecoratedTorusKnot5c: new THREE.Curves.DecoratedTorusKnot5c(),
PipeSpline: pipeSpline,
SampleClosedSpline: sampleClosedSpline
};
var parent, tubeGeometry, mesh;
var params = {
spline: 'GrannyKnot',
scale: 4,
extrusionSegments: 100,
radiusSegments: 3,
closed: true,
animationView: false,
lookAhead: false,
cameraHelper: false,
};
var material = new THREE.MeshLambertMaterial( { color: 0xff00ff } );
var wireframeMaterial = new THREE.MeshBasicMaterial( { color: 0x000000, opacity: 0.3, wireframe: true, transparent: true } );
function addTube() {
if ( mesh !== undefined ) {
parent.remove( mesh );
mesh.geometry.dispose();
}
var extrudePath = splines[ params.spline ];
tubeGeometry = new THREE.TubeBufferGeometry( extrudePath, params.extrusionSegments, 2, params.radiusSegments, params.closed );
addGeometry( tubeGeometry );
setScale();
}
function setScale() {
mesh.scale.set( params.scale, params.scale, params.scale );
}
function addGeometry( geometry ) {
// 3D shape
mesh = new THREE.Mesh( geometry, material );
var wireframe = new THREE.Mesh( geometry, wireframeMaterial );
mesh.add( wireframe );
parent.add( mesh );
}
function animateCamera() {
cameraHelper.visible = params.cameraHelper;
cameraEye.visible = params.cameraHelper;
}
init();
animate();
function init() {
container = document.getElementById( 'container' );
// camera
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.01, 10000 );
camera.position.set( 0, 50, 500 );
// scene
scene = new THREE.Scene();
scene.background = new THREE.Color( 0xf0f0f0 );
// light
var light = new THREE.DirectionalLight( 0xffffff );
light.position.set( 0, 0, 1 );
scene.add( light );
// tube
parent = new THREE.Object3D();
scene.add( parent );
splineCamera = new THREE.PerspectiveCamera( 84, window.innerWidth / window.innerHeight, 0.01, 1000 );
parent.add( splineCamera );
cameraHelper = new THREE.CameraHelper( splineCamera );
scene.add( cameraHelper );
addTube();
// debug camera
cameraEye = new THREE.Mesh( new THREE.SphereBufferGeometry( 5 ), new THREE.MeshBasicMaterial( { color: 0xdddddd } ) );
parent.add( cameraEye );
cameraHelper.visible = params.cameraHelper;
cameraEye.visible = params.cameraHelper;
// renderer
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
// stats
stats = new Stats();
container.appendChild( stats.dom );
// dat.GUI
var gui = new dat.GUI( { width: 300 } );
var folderGeometry = gui.addFolder( 'Geometry' );
folderGeometry.add( params, 'spline', Object.keys( splines ) ).onChange( function () {
addTube();
} );
folderGeometry.add( params, 'scale', 2, 10 ).step( 2 ).onChange( function () {
setScale();
} );
folderGeometry.add( params, 'extrusionSegments', 50, 500 ).step( 50 ).onChange( function () {
addTube();
} );
folderGeometry.add( params, 'radiusSegments', 2, 12 ).step( 1 ).onChange( function () {
addTube();
} );
folderGeometry.add( params, 'closed' ).onChange( function () {
addTube();
} );
folderGeometry.open();
var folderCamera = gui.addFolder( 'Camera' );
folderCamera.add( params, 'animationView' ).onChange( function () {
animateCamera();
} );
folderCamera.add( params, 'lookAhead' ).onChange( function () {
animateCamera();
} );
folderCamera.add( params, 'cameraHelper' ).onChange( function () {
animateCamera();
} );
folderCamera.open();
var controls = new THREE.OrbitControls( camera, renderer.domElement );
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
// animate camera along spline
var time = Date.now();
var looptime = 20 * 1000;
var t = ( time % looptime ) / looptime;
var pos = tubeGeometry.parameters.path.getPointAt( t );
pos.multiplyScalar( params.scale );
// interpolation
var segments = tubeGeometry.tangents.length;
var pickt = t * segments;
var pick = Math.floor( pickt );
var pickNext = ( pick + 1 ) % segments;
binormal.subVectors( tubeGeometry.binormals[ pickNext ], tubeGeometry.binormals[ pick ] );
binormal.multiplyScalar( pickt - pick ).add( tubeGeometry.binormals[ pick ] );
var dir = tubeGeometry.parameters.path.getTangentAt( t );
var offset = 15;
normal.copy( binormal ).cross( dir );
// we move on a offset on its binormal
pos.add( normal.clone().multiplyScalar( offset ) );
splineCamera.position.copy( pos );
cameraEye.position.copy( pos );
// using arclength for stablization in look ahead
var lookAt = tubeGeometry.parameters.path.getPointAt( ( t + 30 / tubeGeometry.parameters.path.getLength() ) % 1 ).multiplyScalar( params.scale );
// camera orientation 2 - up orientation via normal
if ( ! params.lookAhead ) lookAt.copy( pos ).add( dir );
splineCamera.matrix.lookAt( splineCamera.position, lookAt, normal );
splineCamera.rotation.setFromRotationMatrix( splineCamera.matrix, splineCamera.rotation.order );
cameraHelper.update();
renderer.render( scene, params.animationView === true ? splineCamera : camera );
}
</script>
</body>
</html>