Moving mesh on the camera axe

HTML

<script src="http://hapticmedia.fr/demo/3d/_system/includes/thirdparty/babylon.1.12-beta.js"></script>
<canvas id="canvas"></canvas>
<button>Actualize !</button>

CSS

canvas
{
    width : 100%; 
    height: : 350px;
}

JavaScript

//var viewMatrixRotationSubmatrix;
var _CAMERA;

(function(){
    var canvas = document.getElementById("canvas");
    var engine = new BABYLON.Engine(canvas, true);
    scene = createSceneTuto(engine);
    scene.activeCamera.attachControl(canvas);  
    engine.runRenderLoop(function () {
            scene.render();
    });
})()

var sphere = BABYLON.Mesh.CreateSphere("Sphere", 20, 1, scene);
var pos = new BABYLON.Vector3(0,0,10);
sphere.position = pos;
var newpos;

function actualize(){
   // viewMatrixRotationSubmatrix = getCameraViewMatrixRotationSubmatrix(_CAMERA);
    newpos = baseChangement(sphere.position,getCameraViewMatrixRotationSubmatrix(_CAMERA));
    sphere.position.x = newpos.x + _CAMERA.position.x;
	sphere.position.y = newpos.y + _CAMERA.position.y;
	sphere.position.z = newpos.z + _CAMERA.position.z;
    console.debug(sphere.position);    
//    console.debug(pos + '\n');
}

$('button').click(function(){
    console.debug(pos);
    sphere.position = new BABYLON.Vector3(0,0,10);
    
    actualize();
});

        
function createSceneTuto(engine) {
    var scene = new BABYLON.Scene(engine);

    //Adding the light to the scene
    var light = new BABYLON.PointLight("Omni", new BABYLON.Vector3(0, -100, -100), scene);

    //Adding a Free Camera
    var camera = new BABYLON.FreeCamera("Camera", new BABYLON.Vector3(0,0,0), scene);
    camera.speed = 7;
    _CAMERA = camera;

    //Adding Meshes
    var box = BABYLON.Mesh.CreateBox("Box", 6.0, scene);

    //Adding Material
    var materialSphere1 = new BABYLON.StandardMaterial("texture1", scene);

    materialSphere1.diffuseColor = new BABYLON.Color3(1.0, 0.2, 0.7);
    box.material = materialSphere1;
    
    return scene;
}

function getCameraViewMatrixRotationSubmatrix(camera)
    {
        // var matrix = mesh.getWorldMatrix;
        var matrix = [[],[],[]];
        for (var i=0;i<3;i++)
        {
            for (var j=0;j<3;j++)
               ...