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261 lines
6.7 KiB
261 lines
6.7 KiB
2 years ago
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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 webgl - geometry - NURBS</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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<style>
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body {
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background-color: #f0f0f0;
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color: #444;
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}
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a {
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color: #08f;
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}
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</style>
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - NURBS curve and surface example
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.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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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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import { NURBSCurve } from 'three/addons/curves/NURBSCurve.js';
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import { NURBSSurface } from 'three/addons/curves/NURBSSurface.js';
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import { ParametricGeometry } from 'three/addons/geometries/ParametricGeometry.js';
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let container, stats;
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let camera, scene, renderer;
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let group;
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let targetRotation = 0;
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let targetRotationOnPointerDown = 0;
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let pointerX = 0;
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let pointerXOnPointerDown = 0;
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let windowHalfX = window.innerWidth / 2;
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init();
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animate();
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function init() {
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container = document.createElement( 'div' );
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document.body.appendChild( container );
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camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 2000 );
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camera.position.set( 0, 150, 750 );
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scene = new THREE.Scene();
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scene.background = new THREE.Color( 0xf0f0f0 );
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scene.add( new THREE.AmbientLight( 0x808080 ) );
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const light = new THREE.DirectionalLight( 0xffffff, 1 );
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light.position.set( 1, 1, 1 );
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scene.add( light );
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group = new THREE.Group();
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group.position.y = 50;
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scene.add( group );
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// NURBS curve
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const nurbsControlPoints = [];
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const nurbsKnots = [];
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const nurbsDegree = 3;
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for ( let i = 0; i <= nurbsDegree; i ++ ) {
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nurbsKnots.push( 0 );
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}
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for ( let i = 0, j = 20; i < j; i ++ ) {
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nurbsControlPoints.push(
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new THREE.Vector4(
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Math.random() * 400 - 200,
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Math.random() * 400,
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Math.random() * 400 - 200,
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1 // weight of control point: higher means stronger attraction
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)
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);
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const knot = ( i + 1 ) / ( j - nurbsDegree );
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nurbsKnots.push( THREE.MathUtils.clamp( knot, 0, 1 ) );
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}
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const nurbsCurve = new NURBSCurve( nurbsDegree, nurbsKnots, nurbsControlPoints );
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const nurbsGeometry = new THREE.BufferGeometry();
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nurbsGeometry.setFromPoints( nurbsCurve.getPoints( 200 ) );
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const nurbsMaterial = new THREE.LineBasicMaterial( { color: 0x333333 } );
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const nurbsLine = new THREE.Line( nurbsGeometry, nurbsMaterial );
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nurbsLine.position.set( 200, - 100, 0 );
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group.add( nurbsLine );
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const nurbsControlPointsGeometry = new THREE.BufferGeometry();
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nurbsControlPointsGeometry.setFromPoints( nurbsCurve.controlPoints );
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const nurbsControlPointsMaterial = new THREE.LineBasicMaterial( { color: 0x333333, opacity: 0.25, transparent: true } );
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const nurbsControlPointsLine = new THREE.Line( nurbsControlPointsGeometry, nurbsControlPointsMaterial );
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nurbsControlPointsLine.position.copy( nurbsLine.position );
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group.add( nurbsControlPointsLine );
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// NURBS surface
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const nsControlPoints = [
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[
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new THREE.Vector4( - 200, - 200, 100, 1 ),
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new THREE.Vector4( - 200, - 100, - 200, 1 ),
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new THREE.Vector4( - 200, 100, 250, 1 ),
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new THREE.Vector4( - 200, 200, - 100, 1 )
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],
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[
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new THREE.Vector4( 0, - 200, 0, 1 ),
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new THREE.Vector4( 0, - 100, - 100, 5 ),
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new THREE.Vector4( 0, 100, 150, 5 ),
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new THREE.Vector4( 0, 200, 0, 1 )
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],
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[
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new THREE.Vector4( 200, - 200, - 100, 1 ),
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new THREE.Vector4( 200, - 100, 200, 1 ),
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new THREE.Vector4( 200, 100, - 250, 1 ),
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new THREE.Vector4( 200, 200, 100, 1 )
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]
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];
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const degree1 = 2;
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const degree2 = 3;
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const knots1 = [ 0, 0, 0, 1, 1, 1 ];
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const knots2 = [ 0, 0, 0, 0, 1, 1, 1, 1 ];
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const nurbsSurface = new NURBSSurface( degree1, degree2, knots1, knots2, nsControlPoints );
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const map = new THREE.TextureLoader().load( 'textures/uv_grid_opengl.jpg' );
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map.wrapS = map.wrapT = THREE.RepeatWrapping;
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map.anisotropy = 16;
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function getSurfacePoint( u, v, target ) {
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return nurbsSurface.getPoint( u, v, target );
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}
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const geometry = new ParametricGeometry( getSurfacePoint, 20, 20 );
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const material = new THREE.MeshLambertMaterial( { map: map, side: THREE.DoubleSide } );
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const object = new THREE.Mesh( geometry, material );
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object.position.set( - 200, 100, 0 );
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object.scale.multiplyScalar( 1 );
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group.add( object );
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//
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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container.appendChild( renderer.domElement );
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stats = new Stats();
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container.appendChild( stats.dom );
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container.style.touchAction = 'none';
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container.addEventListener( 'pointerdown', onPointerDown );
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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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windowHalfX = window.innerWidth / 2;
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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//
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function onPointerDown( event ) {
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if ( event.isPrimary === false ) return;
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pointerXOnPointerDown = event.clientX - windowHalfX;
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targetRotationOnPointerDown = targetRotation;
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document.addEventListener( 'pointermove', onPointerMove );
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document.addEventListener( 'pointerup', onPointerUp );
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}
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function onPointerMove( event ) {
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if ( event.isPrimary === false ) return;
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pointerX = event.clientX - windowHalfX;
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targetRotation = targetRotationOnPointerDown + ( pointerX - pointerXOnPointerDown ) * 0.02;
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}
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function onPointerUp() {
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if ( event.isPrimary === false ) return;
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document.removeEventListener( 'pointermove', onPointerMove );
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document.removeEventListener( 'pointerup', onPointerUp );
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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group.rotation.y += ( targetRotation - group.rotation.y ) * 0.05;
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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