Center mesh at world origin in Babylon.js - babylonjs

Question

I have a set of 3D face scan obj files I need to display, and I am looking to center each mesh in the world origin.
I have an example below with one of the actual meshes, but if you look, I just tweaked some numbers and rotated it to look right:
mesh.position.x = .1;
mesh.position.y = .46;
mesh.position.z = 0;
mesh.setPivotPoint(mesh.getBoundingInfo().boundingBox.center);
mesh.rotate(BABYLON.Axis.Y, -(Math.PI / 2), BABYLON.Space.WORLD);
mesh.rotate(BABYLON.Axis.X, -(Math.PI / 2), BABYLON.Space.WORLD);
I enabled the bounding box and that is correct.
How can I render each one centered on the origin without magic numbers?
Thanks!
var canvas = document.getElementById("renderCanvas"); // Get the canvas element
var engine = new BABYLON.Engine(canvas, true);
var createScene = function () {
var scene = new BABYLON.Scene(engine);
scene.clearColor = new BABYLON.Color3.FromInts(1, 1, 1);
//Adding a light
var light = new BABYLON.PointLight("Omni", new BABYLON.Vector3(20, 20, 100), scene);
//Adding an Arc Rotate Camera
// var camera = new BABYLON.ArcRotateCamera("Camera", 3, 0, .7, BABYLON.Vector3.Zero(), scene);
var camera = new BABYLON.ArcRotateCamera("Camera", -(Math.PI/2), Math.PI/2, .5, BABYLON.Vector3.Zero(), scene);
// camera.panningAxis = new BABYLON.Vector3(0, 1, 0);
camera.attachControl(canvas, false);
BABYLON.SceneLoader.ImportMesh("" , "https://dl.dropboxusercontent.com/s/n4gwsdn9en6pi86/", "test_ms_simple.obj", scene, function (newMeshes) {
camera.target = BABYLON.Vector3.Zero();
// var mesh = newMeshes[0].getChildMeshes()[0];
var mesh = newMeshes[0];
mesh.showBoundingBox = true;
mesh.position.x = .1;
mesh.position.y = .46;
mesh.position.z = 0;
mesh.setPivotPoint(mesh.getBoundingInfo().boundingBox.center);
mesh.rotate(BABYLON.Axis.Y, -(Math.PI / 2), BABYLON.Space.WORLD);
mesh.rotate(BABYLON.Axis.X, -(Math.PI / 2), BABYLON.Space.WORLD);
camera.minZ = 0;
camera.wheelPrecision = 500;
});
// Move the light with the camera
scene.registerBeforeRender(function () {
light.position = camera.position;
});
// showAxis(10);
return scene;
}
var scene = createScene(); //Call the createScene function
// Register a render loop to repeatedly render the scene
engine.runRenderLoop(function () {
scene.render();
});
// Watch for browser/canvas resize events
window.addEventListener("resize", function () {
engine.resize();
});
function showAxis(size) {
var makeTextPlane = function(text, color, size) {
var dynamicTexture = new BABYLON.DynamicTexture("DynamicTexture", 50, scene, true);
dynamicTexture.hasAlpha = true;
dynamicTexture.drawText(text, 5, 40, "bold 36px Arial", color , "transparent", true);
var plane = BABYLON.Mesh.CreatePlane("TextPlane", size, scene, true);
plane.material = new BABYLON.StandardMaterial("TextPlaneMaterial", scene);
plane.material.backFaceCulling = false;
plane.material.specularColor = new BABYLON.Color3(0, 0, 0);
plane.material.diffuseTexture = dynamicTexture;
return plane;
};
var axisX = BABYLON.Mesh.CreateLines("axisX", [
BABYLON.Vector3.Zero(), new BABYLON.Vector3(size, 0, 0), new BABYLON.Vector3(size * 0.95, 0.05 * size, 0),
new BABYLON.Vector3(size, 0, 0), new BABYLON.Vector3(size * 0.95, -0.05 * size, 0)
], scene);
axisX.color = new BABYLON.Color3(1, 0, 0);
var xChar = makeTextPlane("X", "red", size / 10);
xChar.position = new BABYLON.Vector3(0.9 * size, -0.05 * size, 0);
var axisY = BABYLON.Mesh.CreateLines("axisY", [
BABYLON.Vector3.Zero(), new BABYLON.Vector3(0, size, 0), new BABYLON.Vector3( -0.05 * size, size * 0.95, 0),
new BABYLON.Vector3(0, size, 0), new BABYLON.Vector3( 0.05 * size, size * 0.95, 0)
], scene);
axisY.color = new BABYLON.Color3(0, 1, 0);
var yChar = makeTextPlane("Y", "green", size / 10);
yChar.position = new BABYLON.Vector3(0, 0.9 * size, -0.05 * size);
var axisZ = BABYLON.Mesh.CreateLines("axisZ", [
BABYLON.Vector3.Zero(), new BABYLON.Vector3(0, 0, size), new BABYLON.Vector3( 0 , -0.05 * size, size * 0.95),
new BABYLON.Vector3(0, 0, size), new BABYLON.Vector3( 0, 0.05 * size, size * 0.95)
], scene);
axisZ.color = new BABYLON.Color3(0, 0, 1);
var zChar = makeTextPlane("Z", "blue", size / 10);
zChar.position = new BABYLON.Vector3(0, 0.05 * size, 0.9 * size);
};
<script src="https://cdn.babylonjs.com/babylon.js"></script>
<script src="https://preview.babylonjs.com/loaders/babylon.objFileLoader.min.js"></script>
<canvas id="renderCanvas" width=350 height=350>