def __init__(self, seed):
rand = FastRandom(seed)
self.perm = [None] * 512
noise_tbl = [None] * 256
self.PERSISTENCE = 2.1379201
self.H = 0.836281
self.OCTAVES = 9
self.weights = [None] * self.OCTAVES
self.regen_weight = True
for i in range(0, 256):
noise_tbl[i] = i
for i in range(0, 256):
j = rand.randint() % 256
j = fast_abs(j)
noise_tbl[i], noise_tbl[j] = noise_tbl[j], noise_tbl[i]
for i in range(0, 256):
self.perm[i] = self.perm[i + 256] = noise_tbl[i]
def rive_terrain(self, x, z):
return self._clamp((sqrt(fast_abs(self.river_gen.fBm(0.0008 * x, 0, 0.0008 * z))) - 0.1) * 7.0)