选中物体变红色demo:

https://threejs.org/examples/#webgl_raycast_sprite

<!DOCTYPE html>

<html lang="en">

	<head>

		<title>three.js webgl - raycast - sprite</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;

				font-size: 13px;

				text-align: center;

				margin: 0px;

				background-color: #fff;

				overflow: hidden;

			}

			#info{

				position: absolute;

				z-index: 1;

				width: 100%;

				padding: 5px;

				text-align: center;

			}

		</style>

	</head>

<body>

	<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl raycast sprite<br></div>

	<script src="https://threejs.org/build/three.js"></script>

	<script src="js/OrbitControls.js"></script>

	<script>

		var renderer, scene, camera;

		var controls, group;

		init();

		animate();

		function init() {

			// init renderer

			renderer = new THREE.WebGLRenderer( { antialias: true } );

			renderer.setPixelRatio( window.devicePixelRatio );

			renderer.setSize( window.innerWidth, window.innerHeight );

			document.body.appendChild( renderer.domElement );

			// init scene

			scene = new THREE.Scene();

			scene.background = new THREE.Color( 0xffffff );

			// init camera

			camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );

			camera.position.set( 15, 15, 15 );

			camera.lookAt( scene.position );

			controls = new THREE.OrbitControls( camera, renderer.domElement );

			controls.enableRotate = true;

			group = new THREE.Group();

			scene.add(group);

			geometryP = new THREE.BoxGeometry(10,10,10);

			var materialP = new THREE.MeshBasicMaterial( { color: 0x0000ff ,side:THREE.DoubleSide} );

			circleP = new THREE.Mesh( geometryP, materialP );

			circleP.position.set(-80, -40, 0);

			//geometryP.rotateY(Math.PI/2);

			var group1 = new THREE.Group();

			group.add(group1);

			group1.add(circleP);

			geometryP1 = new THREE.BoxGeometry(-10,-10,10);

			var materialP1 = new THREE.MeshBasicMaterial( { color: 0x00ff00 ,side:THREE.DoubleSide} );

			circleP1 = new THREE.Mesh( geometryP1, materialP1 );

			var group2 = new THREE.Group();

			group.add(group2);

			group2.add(circleP1);

			window.addEventListener( 'resize', onWindowResize, false );

			window.addEventListener( "mousemove", onDocumentMouseMove, false );

		}

		function animate() {

			renderer.render( scene, camera );

			requestAnimationFrame( animate );

		}

		function onWindowResize() {

			camera.aspect = window.innerWidth / window.innerHeight;

			camera.updateProjectionMatrix();

			renderer.setSize( window.innerWidth, window.innerHeight );

		}

		var selectedObject = null;

		function onDocumentMouseMove( event ) {

			event.preventDefault();

			if ( selectedObject ) {

				selectedObject.material.color.set( '#69f' );

				selectedObject = null;

			}

			var intersects = getIntersects( event.layerX, event.layerY );

			if ( intersects.length > 0 &&selectedObject!=intersects[0].object) {

				var res = intersects.filter( function ( res ) {

					return res && res.object;

				} )[ 0 ];

				if ( res && res.object ) {

					selectedObject = res.object;

					selectedObject.material.color.set( '#f00' );

				}

			}

		}

		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( group, true );

		}

	</script>

</body>

</html>

　　

From: https://www.cnblogs.com/xuejianxiyang/p/9732632.html

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