우주

var camera, scene, renderer;

var texture_placeholder,
    isUserInteracting = false,
    onMouseDownMouseX = 0,
    onMouseDownMouseY = 0,
    lon = 90,
    onMouseDownLon = 0,
    lat = 0,
    onMouseDownLat = 0,
    phi = 0,
    theta = 0,
    target = new THREE.Vector3();

init();
animate();

function init() {

    var container, mesh;
    container = document.getElementById('container');
    camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1100);
    scene = new THREE.Scene();
    texture_placeholder = document.createElement('canvas');
    texture_placeholder.width = 128;
    texture_placeholder.height = 128;

    var context = texture_placeholder.getContext('2d');
    context.fillStyle = 'rgb( 200, 200, 200 )';
    context.fillRect(0, 0, texture_placeholder.width, texture_placeholder.height);

    var materials = [
        loadTexture('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space4.jpg'), // right
        loadTexture('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space2.jpg'), // left
        loadTexture('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space1.jpg'), // top
        loadTexture('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space6.jpg'), // bottom
        loadTexture('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space3.jpg'), // back
        loadTexture('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1037366/space5.jpg') // front
    ];

    mesh = new THREE.Mesh(new THREE.BoxGeometry(300, 300, 300, 7, 7, 7), new THREE.MultiMaterial(materials));
    mesh.scale.x = -1;
    scene.add(mesh);

    for (var i = 0, l = mesh.geometry.vertices.length; i < l; i++) {
        var vertex = mesh.geometry.vertices[i];
        vertex.normalize();
        vertex.multiplyScalar(550);
    }

    renderer = new THREE.CanvasRenderer();
    renderer.setPixelRatio(window.devicePixelRatio);
    renderer.setSize(window.innerWidth, window.innerHeight);
    container.appendChild(renderer.domElement);

    document.addEventListener('mousedown', onDocumentMouseDown, false);
    document.addEventListener('mousemove', onDocumentMouseMove, false);
    document.addEventListener('mouseup', onDocumentMouseUp, false);
    //document.addEventListener( 'wheel', onDocumentMouseWheel, false );

    document.addEventListener('touchstart', onDocumentTouchStart, false);
    document.addEventListener('touchmove', onDocumentTouchMove, false);

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

function loadTexture(path) {
    var texture = new THREE.Texture(texture_placeholder);
    var material = new THREE.MeshBasicMaterial({
        map: texture,
        overdraw: 0.5
    });

    var image = new Image();
    image.onload = function () {
        texture.image = this;
        texture.needsUpdate = true;
    };
    image.src = path;
    return material;
}

function onDocumentMouseDown(event) {
    event.preventDefault();
    isUserInteracting = true;
    onPointerDownPointerX = event.clientX;
    onPointerDownPointerY = event.clientY;
    onPointerDownLon = lon;
    onPointerDownLat = lat;
}

function onDocumentMouseMove(event) {
    if (isUserInteracting === true) {
        lon = (onPointerDownPointerX - event.clientX) * 0.1 + onPointerDownLon;
        lat = (event.clientY - onPointerDownPointerY) * 0.1 + onPointerDownLat;
    }
}

function onDocumentMouseUp(event) {
    isUserInteracting = false;
}

function onDocumentTouchStart(event) {
    if (event.touches.length == 1) {
        event.preventDefault();
        onPointerDownPointerX = event.touches[0].pageX;
        onPointerDownPointerY = event.touches[0].pageY;
        onPointerDownLon = lon;
        onPointerDownLat = lat;
    }
}

function onDocumentTouchMove(event) {
    if (event.touches.length == 1) {
        event.preventDefault();
        lon = (onPointerDownPointerX - event.touches[0].pageX) * 0.1 + onPointerDownLon;
        lat = (event.touches[0].pageY - onPointerDownPointerY) * 0.1 + onPointerDownLat;
    }
}

function animate() {
    requestAnimationFrame(animate);
    update();
}

function update() {
    if (isUserInteracting === false) {
        lon += 0.1;
    }

    lat = Math.max(-85, Math.min(85, lat));
    phi = THREE.Math.degToRad(90 - lat);
    theta = THREE.Math.degToRad(lon);

    target.x = 500 * Math.sin(phi) * Math.cos(theta);
    target.y = 500 * Math.cos(phi);
    target.z = 500 * Math.sin(phi) * Math.sin(theta);

    camera.position.copy(target).negate();
    camera.lookAt(target);

    renderer.render(scene, camera);
}