Problem with orthographic camera about babylon.js HOT 6 CLOSED

BABYLON.Matrix.OrthoOffCenterLHToRef = function (left, right, bottom, top, znear, zfar, result) {
    result.m[0] = 2.0 / (right - left);
    result.m[1] = result.m[2] = result.m[3] = 0;
    result.m[5] = 2.0 / (top - bottom);
    result.m[4] = result.m[6] = result.m[7] = 0;
    result.m[10] = -1.0 / (znear - zfar);
    result.m[8] = result.m[9] = result.m[11] = 0;
    result.m[12] = (left + right) / (left - right);
    result.m[13] = (top + bottom) / (bottom - top);
    result.m[14] = znear / (znear - zfar);
    result.m[15] = 1.0;
};

var canvas = document.getElementById("renderCanvas");
var engine = new BABYLON.Engine(canvas, true);
var scene = new BABYLON.Scene(engine);

// Camera on Y axis looking at (0,0,0)
var camera = new BABYLON.FreeCamera("Cam", new BABYLON.Vector3(0,-10,0), scene);
camera.setTarget(new BABYLON.Vector3.Zero());

var box = BABYLON.Mesh.CreateBox("box", 1, scene);
box.position = new BABYLON.Vector3(1, 0, 0);

var renderFunction = function () {
          scene.render();
};
engine.runRenderLoop(renderFunction);
camera.attachControl(canvas);