function Update ()
{
    var layerMask = 1 << 7;

    var hits : RaycastHit[];
    hits = Physics.RaycastAll(transform.position, Vector3.up, 500, layerMask);
    for(var i=0;i<hits.length;i++)
    {
        var hit : RaycastHit = hits[i];
        var filter : MeshFilter = hit.collider.GetComponent(MeshFilter);
        var relativePoint;

        if(hit.collider.gameObject.name == "FowOfWar")
        {
            if(filter)
            {
                relativePoint = filter.transform.InverseTransformPoint(hit.point);
                HalfMesh(filter.mesh, relativePoint, radius);
            }
        }
    }
    Debug.DrawLine (transform.position, hit.point,Color.yellow);
}