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webgl_geometry_nurbs.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - geometry - NURBS</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;
text-align:center;
}
</style>
</head>
<body>
<canvas id="debug" style="position:absolute; left:100px"></canvas>
<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - NURBS curve and surface example</div>
<script src="../build/three.js"></script>
<script src="js/curves/NURBSCurve.js"></script>
<script src="js/curves/NURBSSurface.js"></script>
<script src="js/curves/NURBSUtils.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
var group;
var targetRotation = 0;
var targetRotationOnMouseDown = 0;
var mouseX = 0;
var mouseXOnMouseDown = 0;
var windowHalfX = window.innerWidth / 2;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
var info = document.createElement( 'div' );
info.style.position = 'absolute';
info.style.top = '30px';
info.style.width = '100%';
info.style.textAlign = 'center';
info.innerHTML = 'Drag to spin';
container.appendChild( info );
camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 2000 );
camera.position.set( 0, 150, 750 );
scene = new THREE.Scene();
scene.background = new THREE.Color( 0xf0f0f0 );
scene.add( new THREE.AmbientLight( 0x808080 ) );
var light = new THREE.DirectionalLight( 0xffffff, 1 );
light.position.set( 1, 1, 1 );
scene.add( light );
group = new THREE.Group();
group.position.y = 50;
scene.add( group );
// NURBS curve
var nurbsControlPoints = [];
var nurbsKnots = [];
var nurbsDegree = 3;
for ( var i = 0; i <= nurbsDegree; i ++ ) {
nurbsKnots.push( 0 );
}
for ( var i = 0, j = 20; i < j; i ++ ) {
nurbsControlPoints.push(
new THREE.Vector4(
Math.random() * 400 - 200,
Math.random() * 400,
Math.random() * 400 - 200,
1 // weight of control point: higher means stronger attraction
)
);
var knot = ( i + 1 ) / ( j - nurbsDegree );
nurbsKnots.push( THREE.Math.clamp( knot, 0, 1 ) );
}
var nurbsCurve = new THREE.NURBSCurve( nurbsDegree, nurbsKnots, nurbsControlPoints );
var nurbsGeometry = new THREE.BufferGeometry();
nurbsGeometry.setFromPoints( nurbsCurve.getPoints( 200 ) );
var nurbsMaterial = new THREE.LineBasicMaterial( { color: 0x333333 } );
var nurbsLine = new THREE.Line( nurbsGeometry, nurbsMaterial );
nurbsLine.position.set( 200, - 100, 0 );
group.add( nurbsLine );
var nurbsControlPointsGeometry = new THREE.BufferGeometry();
nurbsControlPointsGeometry.setFromPoints( nurbsCurve.controlPoints );
var nurbsControlPointsMaterial = new THREE.LineBasicMaterial( { color: 0x333333, opacity: 0.25, transparent: true } );
var nurbsControlPointsLine = new THREE.Line( nurbsControlPointsGeometry, nurbsControlPointsMaterial );
nurbsControlPointsLine.position.copy( nurbsLine.position );
group.add( nurbsControlPointsLine );
// NURBS surface
var nsControlPoints = [
[
new THREE.Vector4( - 200, - 200, 100, 1 ),
new THREE.Vector4( - 200, - 100, - 200, 1 ),
new THREE.Vector4( - 200, 100, 250, 1 ),
new THREE.Vector4( - 200, 200, - 100, 1 )
],
[
new THREE.Vector4( 0, - 200, 0, 1 ),
new THREE.Vector4( 0, - 100, - 100, 5 ),
new THREE.Vector4( 0, 100, 150, 5 ),
new THREE.Vector4( 0, 200, 0, 1 )
],
[
new THREE.Vector4( 200, - 200, - 100, 1 ),
new THREE.Vector4( 200, - 100, 200, 1 ),
new THREE.Vector4( 200, 100, - 250, 1 ),
new THREE.Vector4( 200, 200, 100, 1 )
]
];
var degree1 = 2;
var degree2 = 3;
var knots1 = [ 0, 0, 0, 1, 1, 1 ];
var knots2 = [ 0, 0, 0, 0, 1, 1, 1, 1 ];
var nurbsSurface = new THREE.NURBSSurface( degree1, degree2, knots1, knots2, nsControlPoints );
var map = new THREE.TextureLoader().load( 'textures/UV_Grid_Sm.jpg' );
map.wrapS = map.wrapT = THREE.RepeatWrapping;
map.anisotropy = 16;
function getSurfacePoint( u, v, target ) {
return nurbsSurface.getPoint( u, v, target );
}
var geometry = new THREE.ParametricBufferGeometry( getSurfacePoint, 20, 20 );
var material = new THREE.MeshLambertMaterial( { map: map, side: THREE.DoubleSide } );
var object = new THREE.Mesh( geometry, material );
object.position.set( - 200, 100, 0 );
object.scale.multiplyScalar( 1 );
group.add( object );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
stats = new Stats();
container.appendChild( stats.dom );
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
windowHalfX = window.innerWidth / 2;
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
//
function onDocumentMouseDown( event ) {
event.preventDefault();
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
document.addEventListener( 'mouseout', onDocumentMouseOut, false );
mouseXOnMouseDown = event.clientX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
}
function onDocumentMouseMove( event ) {
mouseX = event.clientX - windowHalfX;
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.02;
}
function onDocumentMouseUp() {
document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentMouseOut() {
document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentTouchStart( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseXOnMouseDown = event.touches[ 0 ].pageX - windowHalfX;
targetRotationOnMouseDown = targetRotation;
}
}
function onDocumentTouchMove( event ) {
if ( event.touches.length == 1 ) {
event.preventDefault();
mouseX = event.touches[ 0 ].pageX - windowHalfX;
targetRotation = targetRotationOnMouseDown + ( mouseX - mouseXOnMouseDown ) * 0.05;
}
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;
renderer.render( scene, camera );
}
</script>
</body>
</html>