+ distance = math.sqrt(d_y ** 2 + d_x ** 2)
+ fov_overlap = 1
+ if listener.fov_stencil[speaker.position] != '.':
+ fov_overlap_tiles = 0
+ for i in range(speaker.fov_stencil.size_i):
+ if speaker.fov_stencil.terrain[i] == '.' and\
+ listener.fov_stencil.terrain[i] == '.':
+ fov_overlap_tiles += 1
+ fov_overlap = fov_overlap_tiles / speaker.fov_stencil.size_i
+ volume = fov_overlap / max(1, distance)