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travking fluid particle

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zomseffen 2021-12-20 17:21:46 +01:00
parent 8a5de47da3
commit 54bda855e5
10 changed files with 702 additions and 37 deletions
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92
Client/Client.py
View file

@ -103,6 +103,53 @@ class Client:
self.world_provider.world.put_object(x_pos, y_pos, z_pos, Cuboid().setColor(
random.randint(0, 100) / 100.0, random.randint(0, 100) / 100.0, random.randint(0, 100) / 100.0))
colors = {}
for plate in range(int(np.max(self.world_provider.world.plates))):
colors[plate + 1] = (random.randint(0, 100) / 100.0,
random.randint(0, 100) / 100.0,
random.randint(0, 100) / 100.0)
for x_pos in range(0, 100):
for y_pos in range(0, 100):
for z_pos in range(0, 1):
if self.world_provider.world.plates[x_pos, y_pos] == -1:
r, g, b, = 0, 0, 1 #0.5, 0.5, 0.5
else:
r, g, b = colors[int(self.world_provider.world.plates[x_pos, y_pos])]
self.world_provider.world.set_color(x_pos, y_pos, z_pos, r, g, b)
total_x = self.world_provider.world.chunk_n_x * self.world_provider.world.chunk_size_x
total_y = self.world_provider.world.chunk_n_y * self.world_provider.world.chunk_size_y
for x_pos in range(0, 100):
for y_pos in range(0, 100):
if self.world_provider.world.faults[x_pos, y_pos] == -2:
self.world_provider.world.set_color(x_pos, y_pos, 0, 0, 0, 0)
for line_index, line in enumerate(self.world_provider.world.fault_lines):
for x_pos in range(0, 100):
for y_pos in range(0, 100):
if self.world_provider.world.faults[x_pos, y_pos] == line_index:
if line_index != 9:
self.world_provider.world.set_color(x_pos, y_pos, 0, 0, 0, 1)
else:
self.world_provider.world.set_color(x_pos, y_pos, 0, 1, 1, 1)
for x_pos in range(0, 100):
for y_pos in range(0, 100):
for z_pos in range(0, 1):
if [x_pos, y_pos] in self.world_provider.world.fault_nodes:
r, g, b = 1, 0, 0
self.world_provider.world.set_color(x_pos, y_pos, z_pos, r, g, b)
# # visualize direction lengths
# lengths = np.sqrt(np.sum(np.square(self.world_provider.world.directions), axis=2))
# lengths = lengths / np.max(lengths)
# for x_pos in range(0, 100):
# for y_pos in range(0, 100):
# for z_pos in range(0, 1):
# r, g, b = lengths[x_pos, y_pos], lengths[x_pos, y_pos], lengths[x_pos, y_pos]
# self.world_provider.world.set_color(x_pos, y_pos, z_pos, r, g, b)
self.projMatrix = perspectiveMatrix(45.0, 400 / 400, 0.01, MAX_DISTANCE)
self.rx = self.cx = self.cy = 0
@ -222,28 +269,31 @@ class Client:
max_value_vel = np.max(vel)
# max_value_vel = np.sqrt(3)
print('round')
print('sum n: %f' % np.sum(self.n))
print('max n: %f' % np.max(self.n))
print('min n: %f' % np.min(self.n))
print('sum vel: %f' % np.sum(vel))
print('max vel: %f' % np.max(vel))
print('min vel: %f' % np.min(vel))
# print('round')
# print('sum n: %f' % np.sum(self.n))
# print('max n: %f' % np.max(self.n))
# print('min n: %f' % np.min(self.n))
# print('sum vel: %f' % np.sum(vel))
# print('max vel: %f' % np.max(vel))
# print('min vel: %f' % np.min(vel))
for x_pos in range(0, 100):
for y_pos in range(0, 100):
for z_pos in range(0, 1):
if self.state == 2:
r, g, b = value_to_color(int(self.gravity_applies[x_pos, y_pos, z_pos]), 0, 1)
if self.state == 1:
r, g, b = value_to_color(vel[x_pos, y_pos, z_pos], min_value, max_value_vel)
if self.state == 0:
r, g, b = value_to_color(self.n[x_pos, y_pos, z_pos], min_value, max_value_n)
self.world_provider.world.set_color(x_pos, y_pos, z_pos, r, g, b)
self.world_provider.world.set_color(int(round(self.test_pixel[0])),
int(round(self.test_pixel[1])),
int(round(self.test_pixel[2])), 1.0, 1.0, 1.0)
# for x_pos in range(0, 100):
# for y_pos in range(0, 100):
# for z_pos in range(0, 1):
# # if self.state == 2:
# # r, g, b = value_to_color(int(self.gravity_applies[x_pos, y_pos, z_pos]), 0, 1)
# # if self.state == 1:
# # r, g, b = value_to_color(vel[x_pos, y_pos, z_pos], min_value, max_value_vel)
# # if self.state == 0:
# # r, g, b = value_to_color(self.n[x_pos, y_pos, z_pos], min_value, max_value_n)
# r, g, b, = 128, 128, 128
# if [x_pos, y_pos] in self.world_provider.world.fault_nodes:
# r, g, b = 128, 0, 0
#
# self.world_provider.world.set_color(x_pos, y_pos, z_pos, r, g, b)
# self.world_provider.world.set_color(int(round(self.test_pixel[0])),
# int(round(self.test_pixel[1])),
# int(round(self.test_pixel[2])), 1.0, 1.0, 1.0)
# print(1.0 / (time.time() - self.time))
self.time = time.time()

2
FluidSim/FluidSimParameters.py
View file

@ -1,7 +1,7 @@
class FluidSimParameter:
viscosity = 0.1 / 3.0
# Pr = 1.0
Pr = 100.0
Pr = 1.0
# vc = 1.0
vc = 0.5

185
FluidSim/FluidSimulator.py Normal file
View file

@ -0,0 +1,185 @@
from FluidSim.StaggeredArray import StaggeredArray2D
import numpy as np
import scipy
import scipy.sparse
import scipy.sparse.linalg
class FluidSimulator2D:
def __init__(self, x_n: int, y_n: int):
self.x_n = x_n
self.y_n = y_n
self.array = StaggeredArray2D(self.x_n, self.y_n)
self.coordinate_array = np.zeros((x_n, y_n, 2), dtype=np.int)
for x in range(x_n):
for y in range(y_n):
self.coordinate_array[x, y, :] = x, y
def advect(self, field: np.ndarray, delta_t: float):
u_x, u_y = self.array.get_velocity_arrays()
u = np.stack([u_x, u_y], axis=2)
def runge_kutta_layer(input, time_elapsed, border_handling='clamp'):
shifted_pos = np.round(self.coordinate_array - u * time_elapsed).astype(np.int) * (u < 0) +\
(self.coordinate_array - u * time_elapsed).astype(np.int) * (u > 0) + \
self.coordinate_array * (u == 0)
# border handling
if border_handling == 'clamp':
shifted_pos = np.maximum(0, shifted_pos)
shifted_pos[:, :, 0] = np.minimum(len(input), shifted_pos[:, :, 0])
shifted_pos[:, :, 1] = np.minimum(len(input[0]), shifted_pos[:, :, 1])
pass
layer = np.zeros(field.shape, dtype=field.dtype)
for x in range(self.x_n):
for y in range(self.y_n):
layer[x, y] = field[shifted_pos[x, y][0], shifted_pos[x, y][1]] - field[x, y]
return layer
k1 = runge_kutta_layer(field, delta_t)
k2 = runge_kutta_layer(field + 0.5 * delta_t * k1, 0.5 * delta_t)
k3 = runge_kutta_layer(field + 0.75 * delta_t * k2, 0.75 * delta_t) # maybe 0.25 instead?
# new_field = field + 2.0 / 9.0 * delta_t * k1 + 3.0 / 9.0 * delta_t * k2 + 4.0 / 9.0 * delta_t * k3
new_field = field + k1
return new_field
def get_timestep(self, f, h=1.0, k_cfl=1.0):
f_length = np.max(np.sqrt(np.sum(np.square(f), axis=-1)))
u_x, u_y = self.array.get_velocity_arrays()
u_length = np.max(np.sqrt(np.square(u_x) + np.square(u_y)))
# return k_cfl * h / (u_length + np.sqrt(h + f_length))
return k_cfl * h / u_length
def update_velocity(self, timestep, border_handling='constant'):
if border_handling == 'constant':
p_diff_x = np.pad(self.array.p, [(0, 1), (0, 0)], mode='constant', constant_values=0) -\
np.pad(self.array.p, [(1, 0), (0, 0)], mode='constant', constant_values=0)
borders_fluid_x = np.pad(self.array.has_fluid, [(0, 1), (0, 0)], mode='constant', constant_values=False) +\
np.pad(self.array.has_fluid, [(1, 0), (0, 0)], mode='constant', constant_values=False)
p_diff_y = np.pad(self.array.p, [(0, 0), (0, 1)], mode='constant', constant_values=0) -\
np.pad(self.array.p, [(0, 0), (1, 0)], mode='constant', constant_values=0)
borders_fluid_y = np.pad(self.array.has_fluid, [(0, 0), (0, 1)], mode='constant', constant_values=False) +\
np.pad(self.array.has_fluid, [(0, 0), (1, 0)], mode='constant', constant_values=False)
else:
p_diff_x = 0
p_diff_y = 0
borders_fluid_x = False
borders_fluid_y = False
u_x_new = self.array.u_x - (timestep * p_diff_x) * (1.0 * borders_fluid_x)
u_y_new = self.array.u_y - (timestep * p_diff_y) * (1.0 * borders_fluid_y)
# clear all components that do not border the fluid
u_x_new *= (1.0 * borders_fluid_x)
u_y_new *= (1.0 * borders_fluid_y)
return u_x_new, u_y_new
def calculate_divergence(self, h=1.0):
dx_u = (self.array.u_x[1:, :] - self.array.u_x[:-1, :]) / h
dy_u = (self.array.u_y[:, 1:] - self.array.u_y[:, -1]) / h
return dx_u + dy_u
def pressure_solve(self, divergence):
new_p = np.zeros((self.array.x_n, self.array.y_n))
connection_matrix = np.zeros((self.array.x_n * self.array.y_n, self.array.x_n * self.array.y_n))
flat_divergence = np.zeros((self.array.x_n * self.array.y_n))
for x in range(self.array.x_n):
for y in range(self.array.y_n):
flat_divergence[x * self.array.y_n + y] = divergence[x, y]
neighbors = 4
if x == 0:
neighbors -= 1
else:
connection_matrix[x * self.array.y_n + y, (x - 1) * self.array.y_n + y] = 1
if y == 0:
neighbors -= 1
else:
connection_matrix[x * self.array.y_n + y, x * self.array.y_n + y - 1] = 1
if x == self.array.x_n - 1:
neighbors -= 1
else:
connection_matrix[x * self.array.y_n + y, (x + 1) * self.array.y_n + y] = 1
if y == self.array.y_n - 1:
neighbors -= 1
else:
connection_matrix[x * self.array.y_n + y, x * self.array.y_n + y + 1] = 1
connection_matrix[x * self.array.y_n + y, x * self.array.y_n + y] = -neighbors
p = scipy.sparse.linalg.spsolve(connection_matrix, -flat_divergence)
for x in range(self.array.x_n):
for y in range(self.array.y_n):
new_p[x, y] = p[x * self.array.y_n + y]
return new_p
def timestep(self, external_f, h=1.0, k_cfl=1.0):
"""
:param external_f: external forces to be applied
:param h: grid size
:param k_cfl: speed up multiplier (reduces accuracy if > 1.0. Does not make much sense if smaller than 1.0)
:return:
"""
delta_t = self.get_timestep(external_f, h, k_cfl)
has_fluid = self.advect(self.array.has_fluid * 1.0, delta_t)
self.array.density = self.advect(self.array.density, delta_t)
# temp_u_x = self.advect(self.array.u_x, delta_t)
# temp_u_y = self.advect(self.array.u_y, delta_t)
# self.array.u_x = temp_u_x
# self.array.u_y = temp_u_y
#TODO advect velocity
test_u = np.stack(self.array.get_velocity_arrays(), axis=2)
test = self.advect(np.stack(self.array.get_velocity_arrays(), axis=2), delta_t)
# TODO maybe use dynamic threshold to conserve amount of cells containing fluid
self.array.has_fluid = has_fluid >= 0.5
# add more stuff to advect here. For example temperature, density, and other things. Maybe advect velocity.
# self.array.u_x, self.array.u_y = self.update_velocity(delta_t)
# TODO add forces (a = F / m) -> add a to u
dx_u = (self.array.u_x[1:, :] - self.array.u_x[:-1, :]) / h
dy_u = (self.array.u_y[:, 1:] - self.array.u_y[:, -1]) / h
dx_u = self.advect(dx_u, delta_t)
dy_u = self.advect(dy_u, delta_t)
divergence = dx_u + dy_u
# divergence = self.calculate_divergence(h)
self.array.p = self.pressure_solve(divergence)
self.array.u_x, self.array.u_y = self.update_velocity(delta_t)
if __name__ == '__main__':
fs = FluidSimulator2D(50, 50)
fs.array.has_fluid[10, 10] = True
for i in range(100):
fs.timestep(0)
print(i)
print(fs.array.has_fluid[10, 10])
print(np.sum(fs.array.has_fluid * 1.0))
# test = fs.advect(fs.array.has_fluid * 1.0, 1.0)
#
# test2 = fs.update_velocity(1.0)
#
# test3 = fs.calculate_divergence()
#
# test4 = fs.pressure_solve(test3)

67
FluidSim/LatticeBoltzmann.py
View file

@ -37,6 +37,10 @@ def main():
# Initial Conditions
N = np.ones((Ny, Nx, NL)) # * rho0 / NL
temperature = np.ones((Ny, Nx, NL), np.float) # * rho0 / NL
tracked_fluid = np.zeros((Ny, Nx, NL), np.float) # * rho0 / NL
tracked_fluid[50:, :, 0] = 1
has_fluid = np.ones((Ny, Nx), dtype=np.bool)
has_fluid[int(Ny/2):, :] = False
np.random.seed(42)
@ -56,13 +60,17 @@ def main():
# Cylinder boundary
X, Y = np.meshgrid(range(Nx), range(Ny))
cylinder = (X - Nx / 4) ** 2 + (Y - Ny / 2) ** 2 < (Ny / 4) ** 2
inner_cylinder = (X - Nx / 4) ** 2 + (Y - Ny / 2) ** 2 < (Ny / 4 - 2) ** 2
cylinder[:, :] = False
N[cylinder] = 0
N[0, :] = 0
N[Ny - 1, :] = 0
temperature[cylinder] = 0
tracked_fluid[cylinder] = 0
# N[int(Ny/2):, :] = 0
has_fluid[cylinder] = False
@ -98,14 +106,17 @@ def main():
temperature[:, :, i] = np.roll(temperature[:, :, i], cx, axis=1)
temperature[:, :, i] = np.roll(temperature[:, :, i], cy, axis=0)
tracked_fluid[:, :, i] = np.roll(tracked_fluid[:, :, i], cx, axis=1)
tracked_fluid[:, :, i] = np.roll(tracked_fluid[:, :, i], cy, axis=0)
# has_fluid = new_has_fluid > 0.5
# new_has_fluid[F_sum == 0] += has_fluid[F_sum == 0] * 1.0
# new_has_fluid[(np.abs(F_sum) < 0.000000001)] = 0
fluid_sum = np.sum(has_fluid * 1.0)
has_fluid = (new_has_fluid / np.sum(new_has_fluid * 1.0)) * fluid_sum
print('fluid_cells: %d' % np.sum(has_fluid * 1))
#
# fluid_sum = np.sum(has_fluid * 1.0)
# has_fluid = (new_has_fluid / np.sum(new_has_fluid * 1.0)) * fluid_sum
#
# print('fluid_cells: %d' % np.sum(has_fluid * 1))
# for i in idxs:
# N[:, :, i] *= has_fluid
@ -126,9 +137,13 @@ def main():
bndryTemp = temperature[bndry, :]
bndryTemp = bndryTemp[:, reflection_mapping]
bndryTracked = tracked_fluid[bndry, :]
bndryTracked = bndryTracked[:, reflection_mapping]
sum_f = np.sum(N)
print('Sum of Particles: %f' % sum_f)
print('Sum of Temperature: %f' % np.sum(temperature))
print('Sum of tacked particles: %f' % np.sum(tracked_fluid))
# sum_f_cyl = np.sum(N[cylinder])
# print('Sum of Forces in cylinder: %f' % sum_f_cyl)
@ -147,6 +162,9 @@ def main():
# Calculate fluid variables
rho = np.sum(N, 2)
temp_rho = np.sum(temperature, 2)
tracked_rho = np.sum(tracked_fluid, 2)
ux = np.sum(N * cxs, 2) / rho
uy = np.sum(N * cys, 2) / rho
@ -154,16 +172,28 @@ def main():
uy[(np.abs(rho) < epsilon)] = 0
g = -params.g * (temp_rho - yy / Ny)
uy1 = (uy + g * params.t1 * (tracked_rho * 0.9 + 0.1))
uy2 = (uy + g * params.t2 * (tracked_rho * 0.9 + 0.1))
# uy[np.abs(rho) >= epsilon] += g[np.abs(rho) >= epsilon] / 2.0
uy += g / 2.0
# uy += g / 2.0
# u_length = np.maximum(np.abs(ux), np.abs(uy))
u_length = np.sqrt(np.square(ux) + np.square(uy))
u_length1 = np.sqrt(np.square(ux) + np.square(uy1))
u_length2 = np.sqrt(np.square(ux) + np.square(uy2))
u_max_length1 = np.max(u_length1)
u_max_length2 = np.max(u_length2)
u_max_length = max(u_max_length1, u_max_length2)
if u_max_length > 2:
test = 1
u_max_length = np.max(u_length)
if u_max_length > np.sqrt(2):
ux = (ux / u_max_length) * np.sqrt(2)
uy = (uy / u_max_length) * np.sqrt(2)
uy1 = (uy1 / u_max_length) * np.sqrt(2)
uy2 = (uy2 / u_max_length) * np.sqrt(2)
print('max vector part: %f' % u_max_length)
# ux /= u_max_length
@ -193,13 +223,17 @@ def main():
# Apply Collision
temperature_eq = np.zeros(temperature.shape)
tracked_eq = np.zeros(temperature.shape)
Neq = np.zeros(N.shape)
for i, cx, cy, w in zip(idxs, cxs, cys, weights):
Neq[:, :, i] = rho * w * (
1 + 3 * (cx * ux + cy * uy) + 9 * (cx * ux + cy * uy) ** 2 / 2 - 3 * (ux ** 2 + uy ** 2) / 2)
1 + 3 * (cx * ux + cy * uy1) + 9 * (cx * ux + cy * uy1) ** 2 / 2 - 3 * (ux ** 2 + uy1 ** 2) / 2)
temperature_eq[:, :, i] = temp_rho * w * (
1 + 3 * (cx * ux + cy * uy) + 9 * (cx * ux + cy * uy) ** 2 / 2 - 3 * (ux ** 2 + uy ** 2) / 2)
1 + 3 * (cx * ux + cy * uy2) + 9 * (cx * ux + cy * uy2) ** 2 / 2 - 3 * (ux ** 2 + uy2 ** 2) / 2)
tracked_eq[:, :, i] = tracked_rho * w * (
1 + 3 * (cx * ux + cy * uy1) + 9 * (cx * ux + cy * uy1) ** 2 / 2 - 3 * (ux ** 2 + uy1 ** 2) / 2)
# test1 = np.sum(Neq)
test2 = np.sum(N-Neq)
if abs(test2) > 0.0001:
@ -212,10 +246,12 @@ def main():
N += -(1.0 / params.t1) * (N - Neq)
temperature += -(1.0 / params.t2) * (temperature - temperature_eq)
tracked_fluid += -(1.0 / params.t1) * (tracked_fluid - tracked_eq)
# Apply boundary
N[bndry, :] = bndryN
temperature[bndry, :] = bndryTemp
tracked_fluid[bndry, :] = bndryTracked
# temperature[0, :, 0] = 0
# temperature[1, :, 0] = 0
@ -223,6 +259,7 @@ def main():
temperature[0, :, 0] /= 2
temperature[1, :, 0] /= 2
if it <= 3000:
temperature[Ny - 1, :, 0] = 1
temperature[Ny - 2, :, 0] = 1
@ -280,8 +317,12 @@ def main():
plt.subplot(2, 2, 3)
max_N = np.max(np.sum(N, 2))
plt.imshow(np.sum(N, 2) / max_N * 2.0 - 1.0, cmap='bwr')
plt.clim(-.1, .1)
plt.subplot(2, 2, 4)
plt.imshow(np.sum(tracked_fluid, 2) * 2.0 - 1.0, cmap='bwr')
plt.clim(-.1, .1)
# ax = plt.gca()
# ax.invert_yaxis()
# ax.get_xaxis().set_visible(False)

108
FluidSim/StaggeredArray.py Normal file
View file

@ -0,0 +1,108 @@
import numpy as np
from scipy.signal import convolve
class StaggeredArray2D:
def __init__(self, x_n, y_n):
"""
creates a staggered array
:param x_n: x size of the array
:param y_n: y size of the array
"""
self.x_n = x_n
self.y_n = y_n
self.p = np.zeros((x_n, y_n), dtype=np.float)
self.u_x = np.zeros((x_n + 1, y_n), dtype=np.float)
self.u_y = np.zeros((x_n, y_n + 1), dtype=np.float)
self.has_fluid = np.zeros((x_n, y_n), dtype=np.bool)
self.density = np.zeros((x_n, y_n), dtype=np.float)
def get_velocity(self, x, y):
"""
get mid point value for the coordinates
:param x: x coordinate
:param y: y coordinate
:return:
"""
assert 0 <= x < self.x_n, 'x value out of bounds!'
assert 0 <= y < self.y_n, 'y value out of bounds!'
lower_x = self.u_x[x, y]
upper_x = self.u_x[x + 1, y]
lower_y = self.u_y[x, y]
upper_y = self.u_y[x, y + 1]
return (lower_x + upper_x) / 2.0, (lower_y + upper_y) / 2.0
def get_velocity_arrays(self):
c_x = np.array([[0.5], [0.5]])
u_x = convolve(self.u_x, c_x, mode='valid')
c_y = np.array([[0.5, 0.5]])
u_y = convolve(self.u_y, c_y, mode='valid')
return u_x, u_y
class StaggeredArray3D:
def __init__(self, x_n, y_n, z_n):
"""
creates a staggered array
:param x_n: x size of the array
:param y_n: y size of the array
:param z_n: z size of the array
"""
self.x_n = x_n
self.y_n = y_n
self.z_n = z_n
self.p = np.zeros((x_n, y_n, z_n), dtype=np.float)
self.u_x = np.zeros((x_n + 1, y_n, z_n), dtype=np.float)
self.u_y = np.zeros((x_n, y_n + 1, z_n), dtype=np.float)
self.u_z = np.zeros((x_n, y_n, z_n + 1), dtype=np.float)
self.has_fluid = np.zeros((x_n, y_n, z_n), dtype=np.bool)
def get_velocity(self, x, y, z):
"""
get mid point value for the coordinates
:param x: x coordinate
:param y: y coordinate
:param z: z coordinate
:return:
"""
assert 0 <= x < self.x_n, 'x value out of bounds!'
assert 0 <= y < self.y_n, 'y value out of bounds!'
assert 0 <= z < self.z_n, 'y value out of bounds!'
lower_x = self.u_x[x, y, z]
upper_x = self.u_x[x + 1, y, z]
lower_y = self.u_y[x, y, z]
upper_y = self.u_y[x, y + 1, z]
lower_z = self.u_z[x, y, z]
upper_z = self.u_z[x, y, z + 1]
return (lower_x + upper_x) / 2.0, (lower_y + upper_y) / 2.0, (lower_z + upper_z) / 2.0
if __name__ == '__main__':
sa = StaggeredArray2D(10, 10)
for x in range(11):
for y in range(10):
sa.u_x[x, y] = y
for x in range(10):
for y in range(11):
sa.u_y[x, y] = x
ux, uy = sa.get_velocity_arrays()
ux2, uy2 = sa.get_velocity(0, 0)

0
FluidSim/__init__.py Normal file
View file

229
Objects/World.py
View file

@ -7,6 +7,8 @@ from OpenGL.GLU import *
from OpenGL.GL import *
import math
import numpy as np
import random
import sys
class WorldChunk(Structure):
def __init__(self, width: int, length: int, height: int, programs: dict):
@ -200,6 +202,11 @@ class World(Renderable):
self.chunk_n_z = chunk_n_z
self.programs = programs
self.fault_nodes = []
self.fault_lines = []
self.plates = None
self.directions = None
self.chunks: [[[WorldChunk]]] = []
for x in range(chunk_n_x):
self.chunks.append([])
@ -208,6 +215,228 @@ class World(Renderable):
for z in range(chunk_n_z):
self.chunks[x][y].append(None)
def generate(self, seed=None, sea_height=50, continental_height=200):
if seed is None:
seed = random.randrange(2**32)
seed = 229805811
print('Generation seed is %i' % seed)
random.seed(seed)
np.random.seed(seed)
node_n = self.chunk_n_x + self.chunk_n_y
total_x = self.chunk_n_x * self.chunk_size_x
total_y = self.chunk_n_y * self.chunk_size_y
nodes = []
for _ in range(node_n):
nodes.append([random.randint(0, total_x - 1), random.randint(0, total_y - 1)])
# connections = np.random.randint(2, 5, len(nodes)) #np.zeros(len(nodes)) + 3
connections = (np.abs(np.random.normal(0, 5, len(nodes))) + 2).astype(np.int)
def calc_min_vector(start, end):
dx = end[0] - start[0]
wrapped_dx = dx % total_x
dy = end[1] - start[1]
wrapped_dy = dy % total_y
vector = np.array([dx, dy])
if wrapped_dx < abs(dx):
vector[0] = wrapped_dx
if wrapped_dy < abs(dy):
vector[1] = wrapped_dy
return vector
def is_intersecting_any(start, end, edges):
vec1 = calc_min_vector(start, end)
for (start2_index, end2_index) in edges:
start2 = nodes[start2_index]
end2 = nodes[end2_index]
vec2 = calc_min_vector(start2, end2)
norm1 = vec1 / np.sqrt(np.sum(np.square(vec1)))
norm2 = vec2 / np.sqrt(np.sum(np.square(vec2)))
# parrallel
parallel_threshold = 0.0001
if np.sqrt(np.sum(np.square(norm1 - norm2))) < parallel_threshold or np.sqrt(np.sum(np.square(norm1 + norm2))) < parallel_threshold:
t = (start[0] - start2[0]) / vec2[0]
t2 = (end[0] - start2[0]) / vec2[0]
s = (start2[0] - start[0]) / vec1[0]
s2 = (end2[0] - start[0]) / vec1[0]
if (start2[1] + t * vec2[1]) - start[1] < parallel_threshold:
if (0 <= t <= 1.0 and 0 <= t2 <= 1.0) or (0 <= s <= 1.0 and 0 <= s2 <= 1.0):
return True
else:
if start != start2 and end != end2 and end != start2 and start != end2:
t = (vec1[0] * start[1] + vec1[1] * start2[0] - vec1[1] * start[0] - start2[1] * vec1[0]) / (vec2[1] * vec1[0] - vec2[0] * vec1[1])
if 0 <= t <= 1.0:
intersection = np.array(start2) + vec2 * t
s = (intersection[0] - start[0]) / vec1[0]
if 0 <= s <= 1.0:
return True
return False
for index, node in enumerate(nodes):
distances = []
for other_index, other_node in enumerate(nodes):
if node != other_node and (index, other_index) not in self.fault_lines and\
(other_index, index) not in self.fault_lines:
if (not is_intersecting_any(node, other_node, self.fault_lines)) and (not is_intersecting_any(other_node, node, self.fault_lines)):
distances.append((other_index, np.sqrt(np.sum(np.square(calc_min_vector(node, other_node))))))
distances.sort(key=lambda element: element[1])
while connections[index] > 0 and len(distances) > 0:
self.fault_lines.append((index, distances[0][0]))
connections[distances[0][0]] -= 1
connections[index] -= 1
distances.pop(0)
self.fault_nodes = nodes
plates = np.zeros((total_x, total_y))
faults = np.zeros((total_x, total_y)) - 1
plate_bordering_fault = {}
# draw fault lines
for fault_index, fault_line in enumerate(self.fault_lines):
start = self.fault_nodes[fault_line[0]]
end = self.fault_nodes[fault_line[1]]
vector = calc_min_vector(start, end)
vector = vector / np.sqrt(np.sum(np.square(vector)))
point = np.array(start, dtype=np.float)
plate_bordering_fault[fault_index] = []
while np.sqrt(np.sum(np.square(point - np.array(end)))) > 0.5:
plates[int(point[0]), int(point[1])] = -1
if faults[int(point[0]), int(point[1])] == -1:
faults[int(point[0]), int(point[1])] = fault_index
elif faults[int(point[0]), int(point[1])] != fault_index:
faults[int(point[0]), int(point[1])] = -2
point += 0.5 * vector
point[0] %= total_x
point[1] %= total_y
self.faults = faults
plate = 1
while np.any(plates == 0):
start = np.where(plates == 0)
start = (start[0][0], start[1][0])
plates[start] = plate
work_list = [start]
while len(work_list) > 0:
work = work_list.pop()
up = (work[0], (work[1] + 1) % total_y)
down = (work[0], (work[1] - 1) % total_y)
left = ((work[0] - 1) % total_x, work[1])
right = ((work[0] + 1) % total_x, work[1])
if plates[up] == -1 and plates[down] == -1 and plates[left] == -1 and plates[right] == -1:
plates[work] = -1
continue
if plates[up] <= 0:
if plates[up] == 0:
work_list.append(up)
plates[up] = plate
if plates[down] <= 0:
if plates[down] == 0:
work_list.append(down)
plates[down] = plate
if plates[left] <= 0:
if plates[left] == 0:
work_list.append(left)
plates[left] = plate
if plates[right] <= 0:
if plates[right] == 0:
work_list.append(right)
plates[right] = plate
if faults[up] > -1:
if plate not in plate_bordering_fault[faults[up]]:
plate_bordering_fault[faults[up]].append(plate)
if faults[down] > -1:
if plate not in plate_bordering_fault[faults[down]]:
plate_bordering_fault[faults[down]].append(plate)
if faults[left] > -1:
if plate not in plate_bordering_fault[faults[left]]:
plate_bordering_fault[faults[left]].append(plate)
if faults[right] > -1:
if plate not in plate_bordering_fault[faults[right]]:
plate_bordering_fault[faults[right]].append(plate)
plate += 1
plate_num = plate
for plate in range(1, plate_num):
if np.sum(plates == plate) < 20:
plates[plates == plate] = -1
for key, item in plate_bordering_fault.items():
if plate in item:
item.remove(plate)
directions = np.zeros((total_x, total_y, 3))
heights = np.zeros((total_x, total_y))
for plate in range(1, plate_num):
if random.randint(1, 2) == 1:
heights[plates == plate] = sea_height
else:
heights[plates == plate] = continental_height
coords = np.zeros((total_x, total_y, 2))
for x in range(total_x):
for y in range(total_y):
coords[x, y, 0] = x
coords[x, y, 1] = y
for fault_index, fault_line in enumerate(self.fault_lines):
start = self.fault_nodes[fault_line[0]]
end = self.fault_nodes[fault_line[1]]
vector = calc_min_vector(start, end)
vector = vector / np.sqrt(np.sum(np.square(vector)))
perpendicular = np.array([vector[1], -vector[0]])
if len(plate_bordering_fault[fault_index]) == 2:
for plate in plate_bordering_fault[fault_index]:
vecs = coords - np.array(start)
lengths = np.sqrt(np.sum(np.square(vecs), axis=2, keepdims=True))
norm_vecs = vecs / lengths
scalars = np.sum(norm_vecs * perpendicular, axis=2, keepdims=True)
scalars[lengths == 0] = 0
end_vecs = coords - np.array(end)
end_lengths = np.sqrt(np.sum(np.square(end_vecs), axis=2, keepdims=True))
end_min_length = np.min(end_lengths[np.logical_and(plates == plate, end_lengths[:, :, 0] > 0)])
end_min_length_scalar = scalars[np.logical_and(plates == plate, end_lengths[:, :, 0] == end_min_length)][0, 0]
min_length = np.min(lengths[np.logical_and(plates == plate, lengths[:, :, 0] > 0)])
min_length_scalar = scalars[np.logical_and(plates == plate, lengths[:, :, 0] == min_length)][0, 0]
mean_scalar = np.mean(scalars[plates == plate])
if (min_length_scalar / abs(min_length_scalar)) == (end_min_length_scalar / abs(end_min_length_scalar)):
scalar = min_length_scalar
else:
if (min_length_scalar / abs(min_length_scalar)) == (mean_scalar / abs(mean_scalar)):
scalar = min_length_scalar
else:
scalar = end_min_length_scalar
directions[plates == plate, :2] += perpendicular * (scalar / abs(scalar))
pass
self.plates = plates
self.directions = directions
def set_color(self, x: int, y: int, z: int, r: float, g: float, b: float):
x = x % (self.chunk_size_x * self.chunk_n_x)
y = y % (self.chunk_size_y * self.chunk_n_y)

1
WorldProvider/WorldProvider.py
View file

@ -4,6 +4,7 @@ from Objects.World import World
class WorldProvider:
def __init__(self, programs):
self.world: World = World(10, 10, 10, 10, 10, 10, programs)
self.world.generate()
def update(self):
pass

29
tests/test_FluidSimulator.py Normal file
View file

@ -0,0 +1,29 @@
from FluidSim.FluidSimulator import FluidSimulator2D
import numpy as np
def test_stand_still():
fs = FluidSimulator2D(50, 50)
fs.array.has_fluid[10, 10] = True
for i in range(100):
fs.timestep(0)
assert fs.array.has_fluid[10, 10], "Fluid not on the same spot anymore"
assert np.sum(fs.array.has_fluid * 1.0) == 1.0, "Fluid amount changed"
def test_move_positive_x():
fs = FluidSimulator2D(50, 50)
fs.array.has_fluid[10, 10] = True
fs.array.u_x[10, 10] = 1.0
fs.array.u_x[11, 10] = 1.0
# fs.array.u_x[9, 10] = -1.0
for i in range(10):
fs.timestep(0)
assert np.sum(fs.array.has_fluid * 1.0) == 1.0, "Fluid amount changed"
assert fs.array.has_fluid[0, 10], "Fluid not on the right border"

22
tests/test_Staggered_Array.py Normal file
View file

@ -0,0 +1,22 @@
from FluidSim.StaggeredArray import StaggeredArray2D
def test_staggered_array_2D():
sa = StaggeredArray2D(10, 10)
for x in range(11):
for y in range(10):
sa.u_x[x, y] = y
for x in range(10):
for y in range(11):
sa.u_y[x, y] = x
ux, uy = sa.get_velocity_arrays()
for x in range(10):
for y in range(10):
ux2, uy2 = sa.get_velocity(x, y)
assert ux[x, y] == ux2, 'value output should be consistent!'
assert uy[x, y] == uy2, 'value output should be consistent!'