Fixed it, had to invert the v and above all, clean my eyes and see that MouseEvent already return a UV value !! ! !! ! ! !!!:
function onMouseClickOnObject(e:MouseEvent3D):void {
var m:Matrix = new Matrix();
m.translate(e.uv.u*btmData.width,(1-e.uv.v)*btmData.height);
btmData.draw(brush,m);
}
yeepi !!!
