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webgl_interactive_raycasting_points.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - interactive - raycasting - points</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 {
color: #ffffff;
background-color: #000000;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px;
width: 100%;
padding: 5px;
font-family: Monospace;
font-size: 13px;
text-align: center;
font-weight: bold;
}
a {
color: #fff;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive - raycasting - points </div>
<script src="../build/three.js"></script>
<script src="js/WebGL.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
if ( WEBGL.isWebGLAvailable() === false ) {
document.body.appendChild( WEBGL.getWebGLErrorMessage() );
}
var renderer, scene, camera, stats;
var pointclouds;
var raycaster;
var mouse = new THREE.Vector2();
var intersection = null;
var spheres = [];
var spheresIndex = 0;
var clock;
var threshold = 0.1;
var pointSize = 0.05;
var width = 80;
var length = 160;
var rotateY = new THREE.Matrix4().makeRotationY( 0.005 );
init();
animate();
function generatePointCloudGeometry( color, width, length ) {
var geometry = new THREE.BufferGeometry();
var numPoints = width * length;
var positions = new Float32Array( numPoints * 3 );
var colors = new Float32Array( numPoints * 3 );
var k = 0;
for ( var i = 0; i < width; i ++ ) {
for ( var j = 0; j < length; j ++ ) {
var u = i / width;
var v = j / length;
var x = u - 0.5;
var y = ( Math.cos( u * Math.PI * 4 ) + Math.sin( v * Math.PI * 8 ) ) / 20;
var z = v - 0.5;
positions[ 3 * k ] = x;
positions[ 3 * k + 1 ] = y;
positions[ 3 * k + 2 ] = z;
var intensity = ( y + 0.1 ) * 5;
colors[ 3 * k ] = color.r * intensity;
colors[ 3 * k + 1 ] = color.g * intensity;
colors[ 3 * k + 2 ] = color.b * intensity;
k ++;
}
}
geometry.addAttribute( 'position', new THREE.BufferAttribute( positions, 3 ) );
geometry.addAttribute( 'color', new THREE.BufferAttribute( colors, 3 ) );
geometry.computeBoundingBox();
return geometry;
}
function generatePointcloud( color, width, length ) {
var geometry = generatePointCloudGeometry( color, width, length );
var material = new THREE.PointsMaterial( { size: pointSize, vertexColors: THREE.VertexColors } );
return new THREE.Points( geometry, material );
}
function generateIndexedPointcloud( color, width, length ) {
var geometry = generatePointCloudGeometry( color, width, length );
var numPoints = width * length;
var indices = new Uint16Array( numPoints );
var k = 0;
for ( var i = 0; i < width; i ++ ) {
for ( var j = 0; j < length; j ++ ) {
indices[ k ] = k;
k ++;
}
}
geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
var material = new THREE.PointsMaterial( { size: pointSize, vertexColors: THREE.VertexColors } );
return new THREE.Points( geometry, material );
}
function generateIndexedWithOffsetPointcloud( color, width, length ) {
var geometry = generatePointCloudGeometry( color, width, length );
var numPoints = width * length;
var indices = new Uint16Array( numPoints );
var k = 0;
for ( var i = 0; i < width; i ++ ) {
for ( var j = 0; j < length; j ++ ) {
indices[ k ] = k;
k ++;
}
}
geometry.setIndex( new THREE.BufferAttribute( indices, 1 ) );
geometry.addGroup( 0, indices.length );
var material = new THREE.PointsMaterial( { size: pointSize, vertexColors: THREE.VertexColors } );
return new THREE.Points( geometry, material );
}
function init() {
var container = document.getElementById( 'container' );
scene = new THREE.Scene();
clock = new THREE.Clock();
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.set( 10, 10, 10 );
camera.lookAt( scene.position );
camera.updateMatrix();
//
var pcBuffer = generatePointcloud( new THREE.Color( 1, 0, 0 ), width, length );
pcBuffer.scale.set( 5, 10, 10 );
pcBuffer.position.set( - 5, 0, 0 );
scene.add( pcBuffer );
var pcIndexed = generateIndexedPointcloud( new THREE.Color( 0, 1, 0 ), width, length );
pcIndexed.scale.set( 5, 10, 10 );
pcIndexed.position.set( 0, 0, 0 );
scene.add( pcIndexed );
var pcIndexedOffset = generateIndexedWithOffsetPointcloud( new THREE.Color( 0, 1, 1 ), width, length );
pcIndexedOffset.scale.set( 5, 10, 10 );
pcIndexedOffset.position.set( 5, 0, 0 );
scene.add( pcIndexedOffset );
pointclouds = [ pcBuffer, pcIndexed, pcIndexedOffset ];
//
var sphereGeometry = new THREE.SphereBufferGeometry( 0.1, 32, 32 );
var sphereMaterial = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
for ( var i = 0; i < 40; i ++ ) {
var sphere = new THREE.Mesh( sphereGeometry, sphereMaterial );
scene.add( sphere );
spheres.push( sphere );
}
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
//
raycaster = new THREE.Raycaster();
raycaster.params.Points.threshold = threshold;
//
stats = new Stats();
container.appendChild( stats.dom );
//
window.addEventListener( 'resize', onWindowResize, false );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
}
function onDocumentMouseMove( event ) {
event.preventDefault();
mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
var toggle = 0;
function render() {
camera.applyMatrix( rotateY );
camera.updateMatrixWorld();
raycaster.setFromCamera( mouse, camera );
var intersections = raycaster.intersectObjects( pointclouds );
intersection = ( intersections.length ) > 0 ? intersections[ 0 ] : null;
if ( toggle > 0.02 && intersection !== null ) {
spheres[ spheresIndex ].position.copy( intersection.point );
spheres[ spheresIndex ].scale.set( 1, 1, 1 );
spheresIndex = ( spheresIndex + 1 ) % spheres.length;
toggle = 0;
}
for ( var i = 0; i < spheres.length; i ++ ) {
var sphere = spheres[ i ];
sphere.scale.multiplyScalar( 0.98 );
sphere.scale.clampScalar( 0.01, 1 );
}
toggle += clock.getDelta();
renderer.render( scene, camera );
}
</script>
</body>
</html>