title: Scaling a Three.js geometry only up
body: <p>I'm trying to scale the geometries y-axis. This made my cube scale both up and down. I think mesh.transformY works to animate the cube up half of the scaling value. This would make it look like the cube just scaled upwards. Are there other solutions for this?</p>
  
  <pre><code>    var geometry = new THREE.BoxGeometry(1, 1, 1);
      var mesh = new THREE.Mesh(geometry, new THREE.MeshPhongMaterial({
          color: 0xffffff
      }));
  
      mesh.position.set(0, 2, 0);
      mesh.scale.set(0.98, 0.95, 0.992);
      mesh.castShadow = true;
      scene.add(mesh);
  
      var tween = new TWEEN.Tween(mesh.scale)tween.to({y: 2}, 1000)
      tween.easing(TWEEN.Easing.Elastic.InOut);
      tween.yoyo(true);
      tween.start();
  </code></pre>