How to set object position to be center of its mass? - three.js

Question

Right now, when I upload my model, its center(highlighted by transformControls) is not in the model's center of mass. How can I shift it there?
I tried this:
(model) => {
box = new Box3();
box.expandByObject(model);
const centerOfBox = new Vector3();
box.getCenter(centerOfBox);
const size = new Vector3();
box.getSize(size);
const centerOfWorld = new Vector3(0, size.y/2, 0);
const offset = new Vector3();
offset.subVectors(centerOfWorld, centerOfBox);
const scale = model.scale;
model.translateX(scale.x*offset.x);
model.translateY(scale.y*offset.y);
model.translateZ(scale.z*offset.z);
}
and also this:
(model) => {
model.traverse(function(child) {
const rememberPosition = child.getWorldPosition(new Vector3());
const box = new Box3();
box.expandByObject(child);
const centerOfBox = new Vector3();
box.getCenter(centerOfBox);
const offset = new Vector3();
offset.subVectors(rememberPosition, centerOfBox);
child.traverse(function(ch) {
if (child instanceof Mesh) {
ch.geometry.translate(offset.x, offset.y, offset.z);
ch.translateX(-offset.x);
ch.translateY(-offset.y);
ch.translateZ(-offset.z);
}
});
});
model.position.copy(new Vector3());
}
In the latter version, I tried to shift the geometry to be at the object's position and then shift everything (geometry+position) back to the original place (original place = visibly original place).