[WebGL] Tween Animation

이번 예제에서는 Tween JS를 이용한 오브젝트의 두  상태(state) 간 보간 애니메이션에 관한 것입니다.

Download Project

08-01-tween.zip

Click here to view with full screen mode

Operations

Mouse Left Button Click & Drag: Camera Rotating

Mouse Wheel: Camera Zoom In & Out

Mouse Right Button Click & Drag: Camera Panning

main.js

// MAIN
 
// standard global variables
var container, scene, camera, renderer, controls, stats;
var keyboard = new THREEx.KeyboardState();
var clock = new THREE.Clock();
 
// custom global variables
var mesh;
 
init();
animate();
 
// FUNCTIONS         
function init() 
{
    // SCENE
    scene = new THREE.Scene();
 
    // CAMERA
    var SCREEN_WIDTH = window.innerWidth, SCREEN_HEIGHT = window.innerHeight;
    var VIEW_ANGLE = 45, ASPECT = SCREEN_WIDTH / SCREEN_HEIGHT, NEAR = 0.1, FAR = 20000;
    camera = new THREE.PerspectiveCamera( VIEW_ANGLE, ASPECT, NEAR, FAR);
    scene.add(camera);
    camera.position.set(0,150,400);
    camera.lookAt(scene.position);
 
    // RENDERER
    if ( Detector.webgl )
        renderer = new THREE.WebGLRenderer( {antialias:true} );
    else
        renderer = new THREE.CanvasRenderer(); 
    renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
    container = document.getElementById( 'ThreeJS' );
    container.appendChild( renderer.domElement );
 
    // EVENTS
    THREEx.WindowResize(renderer, camera);
    THREEx.FullScreen.bindKey({ charCode : 'f'.charCodeAt(0) });
 
    // CONTROLS
    controls = new THREE.OrbitControls( camera, renderer.domElement );
 
    // STATS
    stats = new Stats();
    stats.domElement.style.position = 'absolute';
    stats.domElement.style.bottom = '0px';
    stats.domElement.style.zIndex = 100;
    //container.appendChild( stats.domElement );
 
    // LIGHT
    var light = new THREE.PointLight(0xffffff);
    light.position.set(100,250,100);
    scene.add(light);
 
    // SKYBOX
    var skyBoxGeometry = new THREE.CubeGeometry( 10000, 10000, 10000 );
    var skyBoxMaterial = new THREE.MeshBasicMaterial( { color: 0x9999ff, side: THREE.BackSide } );
    var skyBox = new THREE.Mesh( skyBoxGeometry, skyBoxMaterial );
    scene.add(skyBox);
    
    ////////////
    // CUSTOM //
    ////////////
    // ADD A CUBE GEOMETRY
    var cubeGeometry = new THREE.CubeGeometry( 30, 32, 32 ); // width, height, depth, widthSegments, heightSegments, depthSegments
    var cubeMaterial = new THREE.MeshLambertMaterial( { color: 0x7dc9b6 } );
    cubeMesh = new THREE.Mesh( cubeGeometry, cubeMaterial );
    cubeMesh.position.set( -80,40,0 );
    cubeMesh.rotation.set( 0, 0, 0 );
    cubeMesh.scale.set( 1, 1, 1 );
    scene.add(cubeMesh);
 
    // target
    var posTarget = new THREE.Vector3( 100, 40, 0 );
    var rotTarget = new THREE.Vector3( 0, Math.PI, 0 );
    var sclTarget = new THREE.Vector3( 3, 3, 3 );
 
    transform( cubeMesh, posTarget, rotTarget, sclTarget, 4000 );
 
    // Event Listener
    /*
    var button = document.getElementById( 'myButton' );
    button.addEventListener( 'click', function ( event ) {
        transform( cubeMesh, posTarget, rotTarget, sclTarget, 4000 );
    }, false );
    */
}
 
function transform( object, posTarget, rotTarget, sclTarget, duration ) {
    TWEEN.removeAll();
 
    // Position transform
    new TWEEN.Tween( object.position )
        .to( { x: posTarget.x, y: posTarget.y, z: posTarget.z }, duration )
        .easing( TWEEN.Easing.Elastic.InOut )
        .start();
 
    // Rotation transform
    new TWEEN.Tween( object.rotation )
        .to( { x: rotTarget.x, y: rotTarget.y, z: rotTarget.z }, duration )
        .easing( TWEEN.Easing.Exponential.InOut )
        .start();
 
    // Rotation transform
    new TWEEN.Tween( object.scale )
        .to( { x: sclTarget.x, y: sclTarget.y, z: sclTarget.z }, duration )
        .easing( TWEEN.Easing.Exponential.InOut )
        .start();
 
    new TWEEN.Tween( this )
        .to( {}, duration * 2 )
        .onUpdate( render )
        .start();
}
 
function animate() 
{
    requestAnimationFrame( animate );
    TWEEN.update();
    render();        
    update();
}
 
function update()
{
    controls.update();
    stats.update();
}
 
function render() 
{
    renderer.render( scene, camera );
}