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I have a cube in ThreeJS and I would like to rotate it 90 degrees clockwise every time I press a button. I think I have the basic gist of it: create a Three.Animation instance, bind it to the cube, and then have the animation begin every time I press the correct button. However, I'm having a difficult time understanding ThreeJS's API, because it doesn't seem to contain any examples for its methods.
This is THREE.js's Animation constructor: ( root, data, interpolationType, JITCompile ) I don't understand what goes into the fields. I'm guessing root would be where I put my cube, but what about the rest?
Also can I just call animation.play() to cause the animation whenever I want? And how does the animationHandler work?
I have a cube in ThreeJS and I would like to rotate it 90 degrees clockwise every time I press a button. I think I have the basic gist of it: create a Three.Animation instance, bind it to the cube, and then have the animation begin every time I press the correct button. However, I'm having a difficult time understanding ThreeJS's API, because it doesn't seem to contain any examples for its methods.
This is THREE.js's Animation constructor: ( root, data, interpolationType, JITCompile ) I don't understand what goes into the fields. I'm guessing root would be where I put my cube, but what about the rest?
Also can I just call animation.play() to cause the animation whenever I want? And how does the animationHandler work?
1 Answer
Reset to default 12I think for for rotating an object 90 degrees clockwise, using the TWEEN class will do. I think the Animation class is handy for heavier stuff (like bones/skin morphs/etc.)
To use the tween class there are 3 basic steps:
- include the class in your file (
<script src="js/Tween.js"></script>) - add your tween for the event you need (
new TWEEN.Tween( cube.rotation ).to( { y:Math.random()}, 1000 ).easing( TWEEN.Easing.Quadratic.EaseOut).start();) - update the tween in your render loop (
TWEEN.update();)
You can have a have a look at the cubes tween example for a start.
I've modified the default cube example to have the tween in:
<!doctype html>
<html lang="en">
<head>
<title>three.js canvas - geometry - cube</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;
background-color: #f0f0f0;
margin: 0px;
overflow: hidden;
}
</style>
</head>
<body>
<script src="../build/Three.js"></script>
<script src="js/Tween.js"></script>
<script src="js/RequestAnimationFrame.js"></script>
<script src="js/Stats.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
var cube, plane;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var rad90 = Math.PI * .5;
init();
animate();
function init() {
container = document.createElement( 'div' );
document.body.appendChild( container );
var info = document.createElement( 'div' );
info.style.position = 'absolute';
info.style.top = '10px';
info.style.width = '100%';
info.style.textAlign = 'center';
info.innerHTML = 'click to tween';
container.appendChild( info );
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
camera.position.y = 150;
camera.position.z = 500;
scene = new THREE.Scene();
// Cube
var materials = [];
for ( var i = 0; i < 6; i ++ ) {
materials.push( [ new THREE.MeshBasicMaterial( { color: Math.random() * 0xffffff } ) ] );
}
cube = new THREE.Mesh( new THREE.CubeGeometry( 200, 200, 200, 1, 1, 1, materials ), new THREE.MeshFaceMaterial() );
cube.position.y = 150;
cube.overdraw = true;
scene.add( cube );
// Plane
plane = new THREE.Mesh( new THREE.PlaneGeometry( 200, 200 ), new THREE.MeshBasicMaterial( { color: 0xe0e0e0 } ) );
plane.rotation.x = - 90 * ( Math.PI / 180 );
plane.overdraw = true;
scene.add( plane );
renderer = new THREE.CanvasRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
}
//
function onDocumentMouseDown( event ) {
event.preventDefault();
new TWEEN.Tween( cube.rotation ).to( { y: cube.rotation.y + rad90}, 1000 ).easing( TWEEN.Easing.Quadratic.EaseOut).start();
new TWEEN.Tween( plane.rotation ).to( { z: plane.rotation.z + rad90}, 1000 ).easing( TWEEN.Easing.Quadratic.EaseOut).start();
console.log("click");
}
//
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function render() {
TWEEN.update();
renderer.render( scene, camera );
}
</script>
</body>
</html>
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