JavaScript three.js 3d engine: how to make object bigger by 20%?

Question

I've got an object by:

planeWall=new THREE.Mesh(new THREE.PlaneGeometry(10,5,1,1), material);

Then I want to make it bigger, say, 20%
so I tried:

planeWall.geometry=new THREE.PlaneGeometry(12,6,1,1);

but failed,debugger says:

TypeError: Cannot read property 'radius' of null

Is there anyone has some experience for this?

Answer 1

or similarly to Kuka's answer

planeWall.scale.multiplyScalar(1.2);

The idea is the transform properties(position,rotation,scale) are Vector3 instances so you can use the methods provided to easily transform your meshes.

Answer 2

try planeWall.scale.set(1.2,1.2,1.2);