我正在尝试创建模拟 https://riteshsingh.github.io/galaxies/4673 个最近星系的位置。
星系是点。
我想为鼠标悬停时的点着色并加载星系的名称。
我花了很多天试图实现它。我可以更改颜色以及进行基本的光线投射，但是，我无法单独对单个点进行光线投射/颜色。所有点都作为一个组进行光线投射和着色，如图所示当前版本 https://riteshsingh.github.io/galaxies/.
我应该做什么来纠正这个问题？非常感谢您对初学者的时间和耐心。
完整代码可用here https://github.com/RiteshSingh/galaxies/blob/master/index.htm.
相关代码如下：
window.addEventListener( "mousemove", onDocumentMouseMove, false );
var selectedObject = null;
function onDocumentMouseMove( event ) {
event.preventDefault();
if ( selectedObject ) {
selectedObject.material.color.set( '#fff' );
selectedObject = null;
}
var intersects = getIntersects( event.layerX, event.layerY );
if ( intersects.length > 0 ) {
var res = intersects.filter( function ( res ) {
return res && res.object;
} )[ 0 ];
if ( res && res.object ) {
selectedObject = res.object;
selectedObject.material.color.set( '#69f' );
}
}
}
var raycaster = new THREE.Raycaster();
var mouseVector = new THREE.Vector3();
function getIntersects( x, y ) {
x = ( x / window.innerWidth ) * 2 - 1;
y = - ( y / window.innerHeight ) * 2 + 1;
mouseVector.set( x, y, 0.5 );
raycaster.setFromCamera( mouseVector, camera );
return raycaster.intersectObject( dots, true );
}
首先要做的是设置raycaster.params.Points.threshold等于你的点的大小。这使得当用户将鼠标悬停在任何点上时，所有点的颜色都会发生变化：
（为了便于悬停，我增加了点大小）：
<html>
<head>
<meta charset="UTF-8">
<style>
body { margin: 0; }
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/110/three.min.js"></script>
<script src="https://rawcdn.githack.com/mrdoob/three.js/f32e6f14046b5affabe35a0f42f0cad7b5f2470e/examples/js/controls/TrackballControls.js"></script>
</head>
<body>
<script>
// Create an empty scene
var scene = new THREE.Scene();
// Create a basic perspective camera
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
camera.position.x = 200;
// Create a renderer with Antialiasing
var renderer = new THREE.WebGLRenderer({antialias:true});
// Configure renderer clear color
renderer.setClearColor("#000000");
// Configure renderer size
renderer.setSize( window.innerWidth, window.innerHeight );
// Append Renderer to DOM
document.body.appendChild( renderer.domElement );
//Add Milky Way
var dotGeometry = new THREE.Geometry();
dotGeometry.vertices.push(new THREE.Vector3( 0, 0, 0));
var rawFile = new XMLHttpRequest();
rawFile.open("GET", "https://rawcdn.githack.com/RiteshSingh/galaxies/9e6a4e54b37647e5a9a1d6f16c017769533fe258/galaxydata.txt", false);
rawFile.onreadystatechange = function ()
{
if(rawFile.readyState === 4)
{
if(rawFile.status === 200 || rawFile.status == 0)
{
var allText = rawFile.responseText;
var data = allText.split("\n");
for (var i = 0; i < 4672; i++) {
var parts = data[i].split("\t");
var D = parts[0];
var glon = parts[1]*3.1416/180;
var glat = parts[2]*3.1416/180;
var z = D*Math.sin(glat);
var xy = D*Math.cos(glat);
var x = xy*Math.cos(glon);
var y = xy*Math.sin(glon);
dotGeometry.vertices.push(new THREE.Vector3( x, y, z));
}
}
}
}
rawFile.send(null);
var size = 0.32;
var dotMaterial = new THREE.PointsMaterial( { size: size } );
var dots = new THREE.Points( dotGeometry, dotMaterial );
scene.add( dots );
var controls = new THREE.TrackballControls( camera, renderer.domElement );
// Render Loop
var render = function () {
requestAnimationFrame( render );
controls.update();
// Render the scene
renderer.render(scene, camera);
};
render();
window.addEventListener( "mousemove", onDocumentMouseMove, false );
var selectedObject = null;
function onDocumentMouseMove( event ) {
event.preventDefault();
if ( selectedObject ) {
selectedObject.material.color.set( '#fff' );
selectedObject = null;
}
var intersects = getIntersects( event.layerX, event.layerY );
if ( intersects.length > 0 ) {
var res = intersects.filter( function ( res ) {
return res && res.object;
} )[ 0 ];
if ( res && res.object ) {
selectedObject = res.object;
selectedObject.material.color.set( '#69f' );
}
}
}
var raycaster = new THREE.Raycaster();
raycaster.params.Points.threshold = size;
var mouseVector = new THREE.Vector3();
function getIntersects( x, y ) {
x = ( x / window.innerWidth ) * 2 - 1;
y = - ( y / window.innerHeight ) * 2 + 1;
mouseVector.set( x, y, 0.5 );
raycaster.setFromCamera( mouseVector, camera );
return raycaster.intersectObject( dots, true );
}
</script>
</body>
</html>
然后你只需要做到只有悬停点改变颜色：
<html>
<head>
<meta charset="UTF-8">
<style>
body { margin: 0; }
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/110/three.min.js"></script>
<script src="https://rawcdn.githack.com/mrdoob/three.js/f32e6f14046b5affabe35a0f42f0cad7b5f2470e/examples/js/controls/TrackballControls.js"></script></script>
</head>
<body>
<script>
// Create an empty scene
var scene = new THREE.Scene();
// Create a basic perspective camera
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
camera.position.x = 200;
// Create a renderer with Antialiasing
var renderer = new THREE.WebGLRenderer({antialias:true});
// Configure renderer clear color
renderer.setClearColor("#000000");
// Configure renderer size
renderer.setSize( window.innerWidth, window.innerHeight );
// Append Renderer to DOM
document.body.appendChild( renderer.domElement );
//Add Milky Way
var dotGeometry = new THREE.Geometry();
dotGeometry.vertices.push();
var colors = [];
var rawFile = new XMLHttpRequest();
rawFile.open("GET", "https://rawcdn.githack.com/RiteshSingh/galaxies/9e6a4e54b37647e5a9a1d6f16c017769533fe258/galaxydata.txt", false);
rawFile.onreadystatechange = function ()
{
if(rawFile.readyState === 4)
{
if(rawFile.status === 200 || rawFile.status == 0)
{
var allText = rawFile.responseText;
var data = allText.split("\n");
for (var i = 0; i < 4672; i++) {
var parts = data[i].split("\t");
var D = parts[0];
var glon = parts[1]*3.1416/180;
var glat = parts[2]*3.1416/180;
var z = D*Math.sin(glat);
var xy = D*Math.cos(glat);
var x = xy*Math.cos(glon);
var y = xy*Math.sin(glon);
dotGeometry.vertices.push(new THREE.Vector3( x, y, z));
colors.push(new THREE.Color(0xFF0000));
}
}
}
}
rawFile.send(null);
dotGeometry.colors = colors;
var size = 0.32;
var dotMaterial = new THREE.PointsMaterial({
size: size,
vertexColors: THREE.VertexColors,
});
var dots = new THREE.Points( dotGeometry, dotMaterial );
scene.add( dots );
var controls = new THREE.TrackballControls( camera, renderer.domElement );
// Render Loop
var render = function () {
requestAnimationFrame( render );
controls.update();
// Render the scene
renderer.render(scene, camera);
};
render();
window.addEventListener( "mousemove", onDocumentMouseMove, false );
var selectedObject = null;
function onDocumentMouseMove( event ) {
event.preventDefault();
if ( selectedObject ) {
selectedObject.material.color.set( '#fff' );
selectedObject = null;
}
var intersects = getIntersects( event.layerX, event.layerY );
if ( intersects.length > 0 ) {
var idx = intersects[0].index;
dots.geometry.colors[idx] = new THREE.Color(0xFFFFFF);
dots.geometry.colorsNeedUpdate = true;
console.log(idx)
}
}
var raycaster = new THREE.Raycaster();
raycaster.params.Points.threshold = size;
var mouseVector = new THREE.Vector3();
function getIntersects( x, y ) {
x = ( x / window.innerWidth ) * 2 - 1;
y = - ( y / window.innerHeight ) * 2 + 1;
mouseVector.set( x, y, 0.5 );
raycaster.setFromCamera( mouseVector, camera );
return raycaster.intersectObject( dots, true );
}
</script>
</body>
</html>
当用户将鼠标悬停在这些点上后，您会看到这些点变成白色。
我将把它作为教学练习，让您确定如何在鼠标退出给定点后将点变回红色:)
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