add new obstacles such as (obstacle + attenuation level) Plastique = 0.2 Verre teinté = 0.5 Etres vivants = 0.5 Briques = 0.5 Platre = 0.5 Ceramique = 0.7 Papier = 0.7 Beton = 0.85 Verre Blindé = 0.85