[away3d] Problem with Faces on loaded models

[artur]

Hello

Im tryng to make this example based in the turlte meshes tutorial of
Away, basically I want to add a simple sphere in one of the vertices
of the clicked face, I tested this technique with a simple sphere and
adding liitle spheres on it and works, but for some reason it doest
work well on loaded meshes, the points going anywhere, here is my code
used for the test concept:

//--------------------------------------------------------------------------------------------------
// import containers
import away3d.containers.*;
// import core library
import away3d.core.base.*;
// import file format loaders
import away3d.loaders.*;
//import math objects
import away3d.core.math.*;
import away3d.events.MouseEvent3D;
import away3d.core.draw.DrawTriangle;
import away3d.primitives.Sphere;

// create a 3D-viewport
var view:View3D = new View3D({x:300, y:200});
var _holder = new ObjectContainer3D();
// add viewport to the stage
addChild(view);

// start mesh loading
var loader:Object3DLoader = Obj.load("resources/turtle.obj",
{material:"turtle_texture", name:"turtle", scaling:0.1, y:50, x:10, z:
10, loadersize:300,centerMeshes:false});
// add the loader object to the scene
loader.addOnSuccess(this.loadCompleted);
loader.rotationX = -90;

_holder.addChild(loader)
view.scene.addChild(_holder);

// position camera
view.camera.position = new Number3D(1000, 1000, 1000);
view.camera.lookAt(loader.position);

// every frame
addEventListener(Event.ENTER_FRAME, onEnterFrame);

function onEnterFrame(event:Event):void {

    //_holder.rotationY = getTimer() / 100
        // rerender viewport on each frame
        view.render();
}



function addPiece(evt:MouseEvent3D):void{
        trace("click");
        var f:Face = (evt.drawpri as DrawTriangle).face;

         if(f==null) return;

            var fv0:Number3D = new Number3D(f.v0.x,f.v0.y,f.v0.z);
            var fv1:Number3D = new Number3D(f.v1.x,f.v1.y,f.v1.z);
            var fv2:Number3D = new Number3D(f.v2.x,f.v2.y,f.v2.z);


        var obj:Number3D = new Number3D();

            obj.x =fv0.x //*1.1;
            obj.y = fv0.y //*1.1;
            obj.z =fv0.z //*1.1;

        var sphere:Sphere= new  Sphere({material:"blue#cyan", radius:10,
segmentsW:5, segmentsH:5, x:obj.x, y:obj.y, z:obj.z});

        _holder.addChild(sphere);

        }

function loadCompleted(evt:Event):void{

        loader.handle.addOnMouseDown(addPiece);

}

//--------------------------------------------------------------------------------------------------

any Ideas?

cheers

artur