Javascript three.js-将摄影机移动到管内几何体
在3d场景中，通过从外部javascript文件加载200个点作为JSON数据来构建管状几何体。以下是完整的代码：Javascript three.js-将摄影机移动到管内几何体,javascript,three.js,Javascript,Three.js,在3d场景中，通过从外部javascript文件加载200个点作为JSON数据来构建管状几何体。以下是完整的代码： <!DOCTYPE html> <html lang="en"> <head> <title>3d Model using HTML5 and three.js</title> <meta charset="utf-8">
<!DOCTYPE html>
<html lang="en">
<head>
<title>3d Model using HTML5 and three.js</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;
}
#Find_panel {
position: absolute;
right: 5px;
top: 5px;
color: #fff;
text-align: left;
background: rgba(0, 0, 0, 0.5);
padding: 10px;
width: 290px;
height: 120px;
border: solid 1px black;
border-radius: 5px;
}
#Find_panel input {
padding: 2px 4px;
margin-bottom: 3px;
}
</style>
</head>
<body>
<input type="button" value="plot" onClick="return plotPath();" />
<script src="three.min.js" type="text/javascript"></script>
<script src="Curve.js" type="text/javascript"></script>
<script src="TubeGeometry.js" type="text/javascript"></script>
<script src="Stats.js" type="text/javascript"></script>
<script src="Detector.js" type="text/javascript"></script>
<script src="path.js" type="text/javascript"></script>
<script>
// variables
var container, stats, form;
var camera, scene, renderer, splineCamera, cameraHelper, cameraEye;
var text, plane, tube, tubeMesh, parent;
var targetRotation = 0;
var targetRotationOnMouseDown = 0;
var mouseX = 0;
var mouseXOnMouseDown = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var binormal = new THREE.Vector3();
var normal = new THREE.Vector3();
var materials = [];
var onMouseDownMouseX = 0, onMouseDownMouseY = 0,
lon = 0, onMouseDownLon = 0,isUserInteracting = false,
lat = 0, onMouseDownLat = 0,
phi = 0, theta = 0;
function plotPath()
{
var obj = getPath();
var segments = 50;
var closed = false;
var debug = true;
var radiusSegments = 12;
var tube;
var points = [];
var x=0,y=0,z=0;
for(var i=0; i<obj.path.length; i++)
{
console.log(obj.path[i].point);
points.push(obj.path[i].point);
extrudePath = new THREE.SplineCurve3(points);
extrudePath.dynamic = true;
tube = new THREE.TubeGeometry(extrudePath, segments, 2, radiusSegments, closed, debug);
tube.dynamic = true;
tubeMesh = new THREE.Mesh(tube ,new THREE.MeshBasicMaterial({
color: 0x000000,side: THREE.DoubleSide,
opacity: 0.5,transparent: true,
wireframe: true}));
tubeMesh.__dirtyVertices = true;
tubeMesh.dynamic = true;
parent = new THREE.Object3D();
parent.position.y = 100;
if ( tube.debug ) tubeMesh.add( tube.debug );
parent.add( tubeMesh );
}
scene.add( tubeMesh );
scene.add(parent);
animate();
}
init();
//animate();
function init(){
// container
container = document.createElement( 'div' );
document.body.appendChild( container );
// renderer
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
// scene
scene = new THREE.Scene();
// camera
camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1100);
camera.position.set(0, 50, 500);
camera.lookAt(parent);
// CONTROLS
controls = new THREE.TrackballControls( this.camera, container );
// light
scene.add( new THREE.AmbientLight( 0x404040 ) );
light = new THREE.DirectionalLight( 0xffffff );
light.position.set( 0, 1, 0 );
scene.add( light );
// Grid
geometry = new THREE.Geometry();
geometry.vertices.push( new THREE.Vector3( - 500, 0, 0 ) );
geometry.vertices.push( new THREE.Vector3( 500, 0, 0 ) );
for ( var i = 0; i <= 20; i ++ ) {
line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: 0x000000, opacity: 0.2 } ) );
line.position.z = ( i * 50 ) - 500;
scene.add( line );
line = new THREE.Line( geometry, new THREE.LineBasicMaterial( { color: 0x000000, opacity: 0.2 } ) );
line.position.x = ( i * 50 ) - 500;
line.rotation.y = 90 * Math.PI / 180;
scene.add( line );
}
// projector
projector = new THREE.Projector();
// stats
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
//container.appendChild( stats.domElement );
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'mouseover', onDocumentMouseOver, false );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'touchstart', onDocumentTouchStart, false );
document.addEventListener( 'touchmove', onDocumentTouchMove, false );
document.addEventListener( 'mousewheel', onDocumentMouseWheel, false );
document.addEventListener( 'DOMMouseScroll', onDocumentMouseWheel, false);
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
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 );
isUserInteracting = true;
onPointerDownPointerX = event.clientX;
onPointerDownPointerY = event.clientY;
onPointerDownLon = lon;
onPointerDownLat = lat;
}
function onDocumentMouseMove( event ) {
if ( isUserInteracting ) {
lon = ( onPointerDownPointerX - event.clientX ) * 0.1 + onPointerDownLon;
lat = ( event.clientY - onPointerDownPointerY ) * 0.1 + onPointerDownLat;
}
}
function onDocumentMouseUp( event ) {
isUserInteracting = false;
document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentMouseOut( event ) {
document.removeEventListener( 'mousemove', onDocumentMouseMove, false );
document.removeEventListener( 'mouseup', onDocumentMouseUp, false );
document.removeEventListener( 'mouseout', onDocumentMouseOut, false );
}
function onDocumentMouseOver( event ) {
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 onDocumentMouseWheel( event ) {
// WebKit
if ( event.wheelDeltaY ) {
fov -= event.wheelDeltaY * 0.05;
// Opera / Explorer 9
} else if ( event.wheelDelta ) {
fov -= event.wheelDelta * 0.05;
// Firefox
} else if ( event.detail ) {
fov += event.detail * 1.0;
}
camera.projectionMatrix.makePerspective( fov, window.innerWidth / window.innerHeight, 1, 1100 );
render();
}
function animate() {
requestAnimationFrame( animate );
render();
update();
}
function update()
{
controls.update();
stats.update();
}
function render() {
lat = Math.max( - 85, Math.min( 85, lat ) );
phi = ( 90 - lat ) * Math.PI / 180;
theta = lon * Math.PI / 180;
camera.target = 500 * Math.sin( phi ) * Math.cos( theta );
camera.target = 500 * Math.cos( phi );
camera.target = 500 * Math.sin( phi ) * Math.sin( theta );
tubeMesh.rotation.y += ( targetRotation - tubeMesh.rotation.y ) * 0.15;
camera.updateMatrixWorld();
camera.lookAt( camera.target );
renderer.render( scene, camera );
}
</script>
</body>
</html>
在管几何体内部移动有几种方法。 如果只需要跟随某些轨道，可以创建样条曲线，然后使用
spline.getPointAt( 0 -1 )
旋转会让事情变得有点棘手。使用THREE.roll控件实现了类似的功能。
spline.getPointAt( 0 -1 )