在three.js中使用Pointcloud创建平面网格
[英]Create a plane mesh with pointcloud in three.js
问题描述
我创建了一个点云，其中所有点都在一个精确的平面上。 我希望鼠标悬停时将点云突出显示并显示为矩形。 为此，我认为必须先将点云转换为网格。
我已经搜索了几个小时，并尝试阅读thee.js文档。 但是找不到任何解决方案。 您能帮我把这个点云转换成网格吗？ 非常感谢你
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var camera, scene, renderer, controls;
init();
animate();
function init() {
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45.0, window.innerWidth / window.innerHeight, 5, 3500 );
camera.position.z = 2500;
controls = new THREE.TrackballControls( camera, renderer.domElement );
createScene();
}
function createScene() {
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x000000 );
var geometry = new THREE.BufferGeometry();
var positions = [];
for ( var i = 0; i < 500; i ++ ) {
for ( var j = 0; j < 300; j ++ ) {
var y = j;
var x = i;
var z = 0;
positions.push( x, y, z );
}
}
geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
var material = new THREE.PointsMaterial( {color: 0xFFFFFF} );
points = new THREE.Points( geometry, material );
scene.add( points );
}
function animate( time ) {
requestAnimationFrame( animate );
controls.update();
renderer.render( scene, camera );
}
</script>
1 个解决方案
解决方案1
1 已采纳 2018-10-10 13:54:24
这是对样本的快速而肮脏的修改，基本上，它创建了一个与点云具有相同尺寸的细框，并在鼠标移过（使用射线投射器）时切换其可见性。 据我所知，没有直接/内置的方法可以将点云转换为平面/网格。
<!DOCTYPE html>
<html lang="en">
<head>
<title>Three.js - wall construction</title>
<meta charset="utf-8">
<script src="js/three.js"></script>
<script src="js/TrackballControls.js"></script>
</head>
<body style="margin:0;">
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var camera, scene, renderer, controls, box, boxMaterial;
init();
animate();
function init() {
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45.0, window.innerWidth / window.innerHeight, 5, 3500 );
camera.position.z = 2500;
controls = new THREE.TrackballControls( camera, renderer.domElement );
createScene();
renderer.domElement.addEventListener('mousemove', onMouseMove, false);
}
function createScene() {
scene = new THREE.Scene();
scene.background = new THREE.Color( 0x000000 );
var geometry = new THREE.BufferGeometry();
var positions = [];
for ( var i = -250; i < 250; ++i) {
for ( var j = -150; j < 150; ++j) {
positions.push(i, j, 0);
}
}
geometry.addAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
var material = new THREE.PointsMaterial({color: 0xFFFFFF});
points = new THREE.Points(geometry, material);
scene.add(points);
//create box based on pointcloud extends
var geometry = new THREE.BoxGeometry(500, 300, 1 );
boxMaterial = new THREE.MeshBasicMaterial({color: 0x0000FF});
boxMaterial.visible = false //set invisible by default
box = new THREE.Mesh(geometry, boxMaterial);
scene.add(box);
}
function onMouseMove (e) {
var pointer = {
x: (e.clientX / window.innerWidth ) * 2 - 1,
y: - ( e.clientY / window.innerHeight ) * 2 + 1
}
var raycaster = new THREE.Raycaster()
raycaster.setFromCamera(pointer, camera)
var intersects = raycaster.intersectObjects([box])
boxMaterial.visible = !!intersects.length
}
function animate(time) {
requestAnimationFrame(animate);
controls.update();
renderer.render(scene, camera);
}
</script>
</body>
</html>
THREE.js粒子/ PointCloud
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