WebGL, Three.js and Babylon.js learning-threejs/chapter-09/02-selecting-objects.html

2017.05.31 22:03

졸리운_곰 조회 수:383

learning-threejs/chapter-09/02-selecting-objects

<!DOCTYPE html>

<html>

<head>
    <title>Example 09.02 - Selecting objects</title>
    <script type="text/javascript" src="../libs/three.js"></script>

    <script type="text/javascript" src="../libs/stats.js"></script>
    <script type="text/javascript" src="../libs/dat.gui.js"></script>
    <script type="text/javascript" src="../libs/Projector.js"></script>
    <style>
        body {
            /* set margin to 0 and overflow to hidden, to go fullscreen */
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>
<body>

<div id="Stats-output">
</div>
<!-- Div which will hold the Output -->
<div id="WebGL-output">
</div>

<!-- Javascript code that runs our Three.js examples -->
<script type="text/javascript">

    // once everything is loaded, we run our Three.js stuff.
    function init() {

        var stats = initStats();

        // create a scene, that will hold all our elements such as objects, cameras and lights.
        var scene = new THREE.Scene();

        // create a camera, which defines where we're looking at.
        var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);

        // create a render and set the size
        var renderer = new THREE.WebGLRenderer();

        renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));
        renderer.setSize(window.innerWidth, window.innerHeight);


        var projector = new THREE.Projector();
        document.addEventListener('mousedown', onDocumentMouseDown, false);
        document.addEventListener('mousemove', onDocumentMouseMove, false);

        // create the ground plane
        var planeGeometry = new THREE.PlaneGeometry(60, 20, 1, 1);
        var planeMaterial = new THREE.MeshLambertMaterial({color: 0xffffff});
        var plane = new THREE.Mesh(planeGeometry, planeMaterial);


        // rotate and position the plane
        plane.rotation.x = -0.5 * Math.PI;
        plane.position.x = 15;
        plane.position.y = 0;
        plane.position.z = 0;

        // add the plane to the scene
        scene.add(plane);

        // create a cube
        var cubeGeometry = new THREE.BoxGeometry(4, 4, 4);
        var cubeMaterial = new THREE.MeshLambertMaterial({color: 0xff0000});
        var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);


        // position the cube
        cube.position.x = -9;
        cube.position.y = 3;
        cube.position.z = 0;

        // add the cube to the scene
        scene.add(cube);

        var sphereGeometry = new THREE.SphereGeometry(4, 20, 20);
        var sphereMaterial = new THREE.MeshLambertMaterial({color: 0x7777ff});
        var sphere = new THREE.Mesh(sphereGeometry, sphereMaterial);

        // position the sphere
        sphere.position.x = 20;
        sphere.position.y = 0;
        sphere.position.z = 2;
        // add the sphere to the scene
        scene.add(sphere);

        var cylinderGeometry = new THREE.CylinderGeometry(2, 2, 20);
        var cylinderMaterial = new THREE.MeshLambertMaterial({color: 0x77ff77});
        var cylinder = new THREE.Mesh(cylinderGeometry, cylinderMaterial);

        cylinder.position.set(0, 0, 1);

        scene.add(cylinder);


        // position and point the camera to the center of the scene
        camera.position.x = -30;
        camera.position.y = 40;
        camera.position.z = 30;
        camera.lookAt(scene.position);

        // add subtle ambient lighting
        var ambientLight = new THREE.AmbientLight(0x0c0c0c);
        scene.add(ambientLight);

        // add spotlight for the shadows
        var spotLight = new THREE.SpotLight(0xffffff);
        spotLight.position.set(-40, 60, -10);

        scene.add(spotLight);

        // add the output of the renderer to the html element
        document.getElementById("WebGL-output").appendChild(renderer.domElement);

        // call the render function
        var step = 0;
        var scalingStep = 0;

        var controls = new function () {
            this.rotationSpeed = 0.02;
            this.bouncingSpeed = 0.03;
            this.scalingSpeed = 0.03;
            this.showRay = false;
        };

        var gui = new dat.GUI();
        gui.add(controls, 'rotationSpeed', 0, 0.5);
        gui.add(controls, 'bouncingSpeed', 0, 0.5);
        gui.add(controls, 'scalingSpeed', 0, 0.5);
        gui.add(controls, 'showRay').onChange(function (e) {
            if (tube) scene.remove(tube)
        });

        render();

        function render() {
            stats.update();
            // rotate the cube around its axes
            cube.rotation.x += controls.rotationSpeed;
            cube.rotation.y += controls.rotationSpeed;
            cube.rotation.z += controls.rotationSpeed;

            // bounce the sphere up and down
            step += controls.bouncingSpeed;
            sphere.position.x = 20 + ( 10 * (Math.cos(step)));
            sphere.position.y = 2 + ( 10 * Math.abs(Math.sin(step)));

            // scale the cylinder

            scalingStep += controls.scalingSpeed;
            var scaleX = Math.abs(Math.sin(scalingStep / 4));
            var scaleY = Math.abs(Math.cos(scalingStep / 5));
            var scaleZ = Math.abs(Math.sin(scalingStep / 7));
            cylinder.scale.set(scaleX, scaleY, scaleZ);

            // render using requestAnimationFrame
            renderer.render(scene, camera);
            requestAnimationFrame(render);

        }

        var projector = new THREE.Projector();
        var tube;

        function onDocumentMouseDown(event) {

            var vector = new THREE.Vector3(( event.clientX / window.innerWidth ) * 2 - 1, -( event.clientY / window.innerHeight ) * 2 + 1, 0.5);
            vector = vector.unproject(camera);

            var raycaster = new THREE.Raycaster(camera.position, vector.sub(camera.position).normalize());

            var intersects = raycaster.intersectObjects([sphere, cylinder, cube]);

            if (intersects.length > 0) {

                console.log(intersects[0]);

                intersects[0].object.material.transparent = true;
                intersects[0].object.material.opacity = 0.1;
            }
        }

        function onDocumentMouseMove(event) {
            if (controls.showRay) {
                var vector = new THREE.Vector3(( event.clientX / window.innerWidth ) * 2 - 1, -( event.clientY / window.innerHeight ) * 2 + 1, 0.5);
                vector = vector.unproject(camera);

                var raycaster = new THREE.Raycaster(camera.position, vector.sub(camera.position).normalize());
                var intersects = raycaster.intersectObjects([sphere, cylinder, cube]);

                if (intersects.length > 0) {

                    var points = [];
                    points.push(new THREE.Vector3(-30, 39.8, 30));
                    points.push(intersects[0].point);

                    var mat = new THREE.MeshBasicMaterial({color: 0xff0000, transparent: true, opacity: 0.6});
                    var tubeGeometry = new THREE.TubeGeometry(new THREE.SplineCurve3(points), 60, 0.001);

                    if (tube) scene.remove(tube);

                    if (controls.showRay) {
                        tube = new THREE.Mesh(tubeGeometry, mat);
                        scene.add(tube);
                    }
                }
            }
        }

        function initStats() {

            var stats = new Stats();

            stats.setMode(0); // 0: fps, 1: ms

            // Align top-left
            stats.domElement.style.position = 'absolute';
            stats.domElement.style.left = '0px';
            stats.domElement.style.top = '0px';

            document.getElementById("Stats-output").appendChild(stats.domElement);

            return stats;
        }
    }
    window.onload = init;
</script>
</body>
</html>

[출처] https://github.com/josdirksen/learning-threejs/blob/master/chapter-09/02-selecting-objects.html

 

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