10-raycaster-select-click.html


<!DOCTYPE html>
<html lang="en">
<head>
    <title>three.js webgl - raycaster</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 {
            margin: 0px;
            overflow: hidden;
        }
    </style>
    <script src="../frameworks/three.js"></script>
    <script src="../frameworks/stats.js"></script>
        
</head>
<body>
<script>
    var container, stats;
    var camera, scene, raycaster, renderer;

    var mouse = new THREE.Vector2(), SELECTED;
    var radius = 100, theta = 0;

    init();
    animate();

    function init() {

        container = document.createElement( 'div' );
        document.body.appendChild( container );
        camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
        scene = new THREE.Scene();
        var light = new THREE.DirectionalLight( 0xffffff, 1 );
        light.position.set( 1, 1, 1 ).normalize();
        scene.add( light );

        var geometry = new THREE.BoxBufferGeometry( 20, 20, 20 );

        for ( var i = 0; i < 1000; i ++ ) {
            var grey=Math.random();

            var object = new THREE.Mesh( geometry, new THREE.MeshLambertMaterial( { color: new THREE.Color( grey, grey , grey )  } ) );

            object.position.x = Math.random() * 800 - 400;
            object.position.y = Math.random() * 800 - 400;
            object.position.z = Math.random() * 800 - 400;

            object.rotation.x = Math.random() * 2 * Math.PI;
            object.rotation.y = Math.random() * 2 * Math.PI;
            object.rotation.z = Math.random() * 2 * Math.PI;

            object.scale.x = Math.random() + 0.5;
            object.scale.y = Math.random() + 0.5;
            object.scale.z = Math.random() + 0.5;

            scene.add( object );

        }

        renderer = new THREE.WebGLRenderer();
        renderer.setClearColor( 0xf0f0f0 );
        renderer.setPixelRatio( window.devicePixelRatio );
        renderer.setSize( window.innerWidth, window.innerHeight );
        renderer.sortObjects = false;
        container.appendChild(renderer.domElement);

        stats = new Stats();
        container.appendChild( stats.dom );
        
        raycaster = new THREE.Raycaster();

        document.addEventListener( 'mousemove', onDocumentMouseMove, false );
        container.addEventListener( 'mousedown', onDocumentMouseDown, false );
        window.addEventListener( 'resize', onWindowResize, false );

    }

    function onWindowResize() {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize( window.innerWidth, window.innerHeight );
    }

    function onDocumentMouseMove( event ) {
        event.preventDefault();
        mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
        mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
    }
            
    function onDocumentMouseDown( event ) {
        event.preventDefault();
        if ( SELECTED ){
            SELECTED.currentHex = 0x00ff00*Math.random();
            SELECTED.material.emissive.setHex( SELECTED.currentHex );
        }
    }
            

    function animate() {
        requestAnimationFrame( animate );
        render();
        stats.update();
    }

    function render() {
        // find intersections
        raycaster.setFromCamera( mouse, camera );
        var intersects = raycaster.intersectObjects( scene.children );
        if ( intersects.length > 0 ) {
            if ( SELECTED != intersects[ 0 ].object ) {
                if ( SELECTED ) SELECTED.material.emissive.setHex( SELECTED.currentHex );
                SELECTED = intersects[ 0 ].object;
                SELECTED.currentHex = SELECTED.material.emissive.getHex();
                SELECTED.material.emissive.setHex( 0xff0000 );
                container.style.cursor = 'pointer';
            }

        } else {
            if ( SELECTED ) {
               SELECTED.material.emissive.setHex( SELECTED.currentHex );
               SELECTED = null;
               container.style.cursor = 'auto';
            }
        }

        renderer.render( scene, camera );

    }

</script>

</body>
</html>