ThreeJS – smooth scaling object while mouseover - object

Question

another ThreeJS question:
How can I make a hovered (intersected) object scale smooth to a defined size? My current code is
INTERSECTED.scale.x *= 1.5;
INTERSECTED.scale.y *= 1.5;
but this only works like on/off.
Edit: My Solution (with tweenJS)
While mouseOver I scale up the element to 200% :
function scaleUp(){
new TWEEN.Tween( INTERSECTED.scale ).to( {
x: 2,
y: 2
}, 350 ).easing( TWEEN.Easing.Bounce.EaseOut).start();
}
While mouseOut I scale down the element to 100% :
function scaleDown(){
new TWEEN.Tween( INTERSECTED.scale ).to( {
x: 1,
y: 1
}, 350 ).easing( TWEEN.Easing.Bounce.EaseOut).start();
}
Finally I call the functions in the mouse function.
if (intersects[0].object != INTERSECTED)
scaleUp();
else
scaleDown();
That's all. Very useful for UIs I think.

Answer 1

Using the tween library (found in three.js/examples/js/libs/tween.min.js) you can animate the scale like so:
function setupObjectScaleAnimation( object, source, target, duration, delay, easing )
{
var l_delay = ( delay !== undefined ) ? delay : 0;
var l_easing = ( easing !== undefined ) ? easing : TWEEN.Easing.Linear.None;
new TWEEN.Tween( source )
.to( target, duration )
.delay( l_delay )
.easing( l_easing )
.onUpdate( function() { object.scale.copy( source ); } )
.start();
}
and then call it like so:
setupObjectScaleAnimation( INTERSECTED,
{ x: 1, y: 1, z: 1 }, { x: 2, y: 2, z: 2 },
2000, 500, TWEEN.Easing.Linear.None );
Or if you want to use the render loop:
clock = new THREE.Clock();
time = clock.getElapsedTime();
INSPECTED.scale.x = time / 1000;
INSPECTED.scale.y = time / 1000;
You can change the divisor based on how fast or slow you want the animation to happen.