Removed Python terrainlib
This commit is contained in:
Gaël C
parent
7495d8a690
commit
0427b42d17
179
generate.py
179
generate.py
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#!/usr/bin/env python3
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import numpy as np
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from noise import snoise2
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import os
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import sys
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import terrainlib
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def noisemap(X, Y, scale=0.01, vscale=1.0, offset=0.0, log=False, **params):
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# Determine noise offset randomly
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xbase = np.random.randint(8192)-4096
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ybase = np.random.randint(8192)-4096
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if log:
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vscale /= offset
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# Generate the noise
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n = np.zeros((X, Y))
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for x in range(X):
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for y in range(Y):
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n[x,y] = snoise2(x/scale + xbase, y/scale + ybase, **params)
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if log:
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return np.exp(n*vscale) * offset
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else:
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return n*vscale + offset
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### PARSE COMMAND-LINE ARGUMENTS
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argc = len(sys.argv)
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config_file = 'terrain_default.conf'
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output_dir = 'river_data'
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params_from_args = {}
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i = 1 # Index of arguments
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j = 1 # Number of 'orphan' arguments (the ones that are not preceded by '--something')
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while i < argc:
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arg = sys.argv[i]
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if arg[:2] == '--':
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pname = arg[2:]
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v = None
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split = pname.split('=', maxsplit=1)
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if len(split) == 2:
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pname, v = split
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i += 1
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elif i+1 < argc:
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v = sys.argv[i+1]
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i += 2
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if v is not None:
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if pname == 'config':
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config_file = v
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elif pname == 'output':
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output_dir = v
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else:
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params_from_args[pname] = v
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else:
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if j == 1:
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config_file = arg
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elif j == 2:
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output_dir = arg
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i += 1
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j += 1
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print(config_file, output_dir)
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params = terrainlib.read_config_file(config_file)
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params.update(params_from_args) # Params given from args prevail against conf file
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### READ SETTINGS
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def get_setting(name, default):
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if name in params:
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return params[name]
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return default
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mapsize = int(get_setting('mapsize', 1000))
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scale = float(get_setting('scale', 400.0))
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vscale = float(get_setting('vscale', 300.0))
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offset = float(get_setting('offset', 0.0))
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persistence = float(get_setting('persistence', 0.6))
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lacunarity = float(get_setting('lacunarity', 2.0))
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K = float(get_setting('K', 0.5))
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m = float(get_setting('m', 0.5))
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d = float(get_setting('d', 0.5))
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sea_level = float(get_setting('sea_level', 0.0))
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sea_level_variations = float(get_setting('sea_level_variations', 0.0))
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sea_level_variations_time = float(get_setting('sea_level_variations_time', 1.0))
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flex_radius = float(get_setting('flex_radius', 20.0))
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flow_method = get_setting('flow_method', 'semirandom')
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time = float(get_setting('time', 10.0))
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niter = int(get_setting('niter', 10))
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### MAKE INITIAL TOPOGRAPHY
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n = np.zeros((mapsize+1, mapsize+1))
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# Set noise parameters
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params = {
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"offset" : offset,
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"vscale" : vscale,
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"scale" : scale,
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"octaves" : int(np.ceil(np.log2(mapsize)))+1,
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"persistence" : persistence,
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"lacunarity" : lacunarity,
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}
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params_sealevel = {
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"octaves" : 1,
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"persistence" : 1,
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"lacunarity" : 2,
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}
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if sea_level_variations != 0.0:
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sea_ybase = np.random.randint(8192)-4096
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sea_level_ref = snoise2(time * (1-1/niter) / sea_level_variations, sea_ybase, **params_sealevel) * sea_level_variations
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params['offset'] -= (sea_level_ref + sea_level)
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n = noisemap(mapsize+1, mapsize+1, **params)
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### COMPUTE LANDSCAPE EVOLUTION
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# Initialize landscape evolution model
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print('Initializing model')
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model = terrainlib.EvolutionModel(n, K=K, m=m, d=d, sea_level=sea_level, flex_radius=flex_radius, flow_method=flow_method)
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terrainlib.update(model.dem, model.lakes, t=5, sea_level=model.sea_level, title='Initializing...')
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dt = time/niter
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# Run the model's processes: the order in which the processes are run is arbitrary and could be changed.
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for i in range(niter):
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disp_niter = 'Iteration {:d} of {:d}...'.format(i+1, niter)
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if sea_level_variations != 0:
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model.sea_level = snoise2((i*dt)/sea_level_variations_time, sea_ybase, **params_sealevel) * sea_level_variations - sea_level_ref
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terrainlib.update(model.dem, model.lakes, sea_level=model.sea_level, title=disp_niter)
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print(disp_niter)
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print('Diffusion')
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model.diffusion(dt)
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print('Flow calculation')
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model.calculate_flow()
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terrainlib.update(model.dem, model.lakes, sea_level=model.sea_level, title=disp_niter)
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print('Advection')
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model.advection(dt)
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print('Isostatic equilibration')
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model.adjust_isostasy()
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print('Last flow calculation')
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model.calculate_flow()
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print('Done!')
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# Twist the grid
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bx, by = terrainlib.make_bounds(model.dirs, model.rivers)
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offset_x, offset_y = terrainlib.twist(bx, by, terrainlib.get_fixed(model.dirs))
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# Convert offset in 8-bits
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offset_x = np.clip(np.floor(offset_x * 256), -128, 127)
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offset_y = np.clip(np.floor(offset_y * 256), -128, 127)
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### SAVE OUTPUT
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if not os.path.isdir(output_dir):
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os.mkdir(output_dir)
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os.chdir(output_dir)
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# Save the files
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terrainlib.save(model.dem, 'dem', dtype='>i2')
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terrainlib.save(model.lakes, 'lakes', dtype='>i2')
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terrainlib.save(offset_x, 'offset_x', dtype='i1')
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terrainlib.save(offset_y, 'offset_y', dtype='i1')
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terrainlib.save(model.dirs, 'dirs', dtype='u1')
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terrainlib.save(model.rivers, 'rivers', dtype='>u4')
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with open('size', 'w') as sfile:
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sfile.write('{:d}\n{:d}'.format(mapsize+1, mapsize+1))
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terrainlib.stats(model.dem, model.lakes)
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print()
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print('Grid is ready for use!')
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terrainlib.plot(model.dem, model.lakes, title='Final grid, ready for use!')
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@ -1,7 +0,0 @@
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# Load packages and provide easy access to important functions
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from .settings import read_config_file
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from .erosion import EvolutionModel
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from .save import save
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from .bounds import make_bounds, twist, get_fixed
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from .view import stats, update, plot
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import numpy as np
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def make_bounds(dirs, rivers):
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"""
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Give an array of all horizontal and vertical bounds
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"""
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(Y, X) = dirs.shape
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bounds_h = np.zeros((Y, X-1), dtype=rivers.dtype)
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bounds_v = np.zeros((Y-1, X), dtype=rivers.dtype)
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bounds_v += (rivers * (dirs==1))[:-1,:]
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bounds_h += (rivers * (dirs==2))[:,:-1]
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bounds_v -= (rivers * (dirs==3))[1:,:]
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bounds_h -= (rivers * (dirs==4))[:,1:]
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return bounds_h, bounds_v
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def get_fixed(dirs):
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"""
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Give the list of points that should not be twisted
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"""
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borders = np.zeros(dirs.shape, dtype='?')
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borders[-1,:] |= dirs[-1,:]==1
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borders[:,-1] |= dirs[:,-1]==2
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borders[0,:] |= dirs[0,:]==3
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borders[:,0] |= dirs[:,0]==4
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donors = np.zeros(dirs.shape, dtype='?')
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donors[1:,:] |= dirs[:-1,:]==1
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donors[:,1:] |= dirs[:,:-1]==2
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donors[:-1,:] |= dirs[1:,:]==3
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donors[:,:-1] |= dirs[:,1:]==4
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return borders | ~donors
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def twist(bounds_x, bounds_y, fixed, d=0.1, n=5):
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"""
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Twist the grid (define an offset for every node). Model river bounds as if they were elastics.
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Smoothes preferentially big rivers.
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"""
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moveable = ~fixed
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(Y, X) = fixed.shape
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offset_x = np.zeros((Y, X))
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offset_y = np.zeros((Y, X))
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for i in range(n):
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force_long = np.abs(bounds_x) * (1+np.diff(offset_x, axis=1))
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force_trans = np.abs(bounds_y) * np.diff(offset_x, axis=0)
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force_x = np.zeros((Y, X))
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force_x[:,:-1] = force_long
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force_x[:,1:] -= force_long
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force_x[:-1,:]+= force_trans
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force_x[1:,:] -= force_trans
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force_long = np.abs(bounds_y) * (1+np.diff(offset_y, axis=0))
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force_trans = np.abs(bounds_x) * np.diff(offset_y, axis=1)
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force_y = np.zeros((Y, X))
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force_y[:-1,:] = force_long
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force_y[1:,:] -= force_long
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force_y[:,:-1]+= force_trans
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force_y[:,1:] -= force_trans
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length = np.hypot(force_x, force_y)
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length[length==0] = 1
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coeff = d / length * moveable # Normalize, take into account the direction only
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offset_x += force_x * coeff
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offset_y += force_y * coeff
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return offset_x, offset_y
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import numpy as np
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import scipy.ndimage as im
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from .rivermapper import flow
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def advection(dem, dirs, rivers, time, K=1, m=0.5, sea_level=0):
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"""
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Simulate erosion by rivers.
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This models erosion as an upstream advection of elevations ("erosion waves").
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Advection speed depends on water flux and parameters:
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v = K * flux^m
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"""
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adv_time = 1 / (K*rivers**m) # For every pixel, calculate the time an "erosion wave" will need to cross it.
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dem = np.maximum(dem, sea_level)
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dem_new = np.zeros(dem.shape)
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for y in range(dirs.shape[0]):
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for x in range(dirs.shape[1]):
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# Elevations propagate upstream, so for every pixel we seek the downstream pixel whose erosion wave just reached the current pixel.
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# This means summing the advection times downstream until we reach the erosion time.
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x0, y0 = x, y
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x1, y1 = x, y
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remaining = time
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while True:
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# Move one pixel downstream
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flow_dir = dirs[y0,x0]
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if flow_dir == 0:
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remaining = 0
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break
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elif flow_dir == 1:
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y1 += 1
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elif flow_dir == 2:
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x1 += 1
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elif flow_dir == 3:
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y1 -= 1
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elif flow_dir == 4:
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x1 -= 1
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if remaining <= adv_time[y0,x0]: # Time is over, we found it.
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break
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remaining -= adv_time[y0,x0]
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x0, y0 = x1, y1
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c = remaining / adv_time[y0,x0]
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dem_new[y,x] = c*dem[y1,x1] + (1-c)*dem[y0,x0] # If between 2 pixels, perform linear interpolation.
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return dem_new
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def diffusion(dem, time, d=1):
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radius = d * time**.5
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if radius == 0:
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return dem
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return im.gaussian_filter(dem, radius, mode='reflect') # Diffusive erosion is a simple Gaussian blur
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class EvolutionModel:
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def __init__(self, dem, K=1, m=0.5, d=1, sea_level=0, flow=False, flex_radius=100, flow_method='semirandom'):
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self.dem = dem
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#self.bedrock = dem
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self.K = K
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self.m = m
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self.d = d
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self.sea_level = sea_level
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self.flex_radius = flex_radius
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self.define_isostasy()
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self.flow_method = flow_method
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#set_flow_method(flow_method)
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if flow:
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self.calculate_flow()
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else:
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self.lakes = dem
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self.dirs = np.zeros(dem.shape, dtype=int)
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self.rivers = np.zeros(dem.shape, dtype=int)
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self.flow_uptodate = False
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def calculate_flow(self):
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self.dirs, self.lakes, self.rivers = flow(self.dem, method=self.flow_method)
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self.flow_uptodate = True
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def advection(self, time):
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dem = advection(np.maximum(self.dem, self.lakes), self.dirs, self.rivers, time, K=self.K, m=self.m, sea_level=self.sea_level)
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self.dem = np.minimum(dem, self.dem)
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self.flow_uptodate = False
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def diffusion(self, time):
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self.dem = diffusion(self.dem, time, d=self.d)
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self.flow_uptodate = False
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def define_isostasy(self):
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self.ref_isostasy = im.gaussian_filter(self.dem, self.flex_radius, mode='reflect') # Define a blurred version of the DEM that will be considered as the reference isostatic elevation.
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def adjust_isostasy(self, rate=1):
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isostasy = im.gaussian_filter(self.dem, self.flex_radius, mode='reflect') # Calculate blurred DEM
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correction = (self.ref_isostasy - isostasy) * rate # Compare it with the reference isostasy
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self.dem = self.dem + correction # Adjust
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@ -1,278 +0,0 @@
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import numpy as np
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import numpy.random as npr
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from collections import defaultdict
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# This file provide functions to construct the river tree from an elevation model.
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# Based on a research paper:
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# | Cordonnier, G., Bovy, B., and Braun, J.:
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# | A versatile, linear complexity algorithm for flow routing in topographies with depressions,
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# | Earth Surf. Dynam., 7, 549–562, https://doi.org/10.5194/esurf-7-549-2019, 2019.
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# Big thanks to them for releasing this paper under a free license ! :)
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# The algorithm here makes use of most of the paper's concepts, including the Planar Boruvka algorithm.
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# Only flow_local and accumulate_flow are custom algorithms.
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# Define two different method for local flow routing
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def flow_local_steepest(plist):
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vmax = 0.0
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imax = 0.0
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for i, p in enumerate(plist):
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if p > vmax:
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vmax = p
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imax = i
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if vmax > 0.0:
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return imax+1
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return 0
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def flow_local_semirandom(plist):
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"""
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Determines a flow direction based on denivellation for every neighbouring node.
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Denivellation must be positive for downward and zero for flat or upward:
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dz = max(zref-z, 0)
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"""
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psum = sum(plist)
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if psum == 0:
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return 0
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r = npr.random() * psum
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for i, p in enumerate(plist):
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if r < p:
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return i+1
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r -= p
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flow_local_methods = {
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'steepest' : flow_local_steepest,
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'semirandom' : flow_local_semirandom,
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}
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def flow(dem, method='semirandom'):
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if method in flow_local_methods:
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flow_local = flow_local_methods[method]
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else:
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raise KeyError('Flow method \'{}\' does not exist'.format(method))
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# Flow locally
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dirs1 = np.zeros(dem.shape, dtype=int)
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dirs2 = np.zeros(dem.shape, dtype=int)
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(X, Y) = dem.shape
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Xmax, Ymax = X-1, Y-1
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singular = []
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for x in range(X):
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z0 = z1 = z2 = dem[x,0]
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for y in range(Y):
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z0 = z1
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z1 = z2
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if y < Ymax:
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z2 = dem[x, y+1]
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plist = [
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max(z1-dem[x+1,y],0) if x<Xmax else 0, # 1: x -> x+1
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max(z1-z2,0), # 2: y -> y+1
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max(z1-dem[x-1,y],0) if x>0 else 0, # 3: x -> x-1
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max(z1-z0,0), # 4: y -> y-1
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]
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pdir = flow_local(plist)
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dirs2[x,y] = pdir
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if pdir == 0:
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singular.append((x,y))
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elif pdir == 1:
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dirs1[x+1,y] += 1
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elif pdir == 2:
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dirs1[x,y+1] += 2
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elif pdir == 3:
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dirs1[x-1,y] += 4
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elif pdir == 4:
|
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dirs1[x,y-1] += 8
|
||||
|
||||
# Compute basins
|
||||
basin_id = np.zeros(dem.shape, dtype=int)
|
||||
stack = []
|
||||
|
||||
for i, s in enumerate(singular):
|
||||
queue = [s]
|
||||
while queue:
|
||||
x, y = queue.pop()
|
||||
basin_id[x,y] = i
|
||||
d = int(dirs1[x,y])
|
||||
|
||||
if d & 1:
|
||||
queue.append((x-1,y))
|
||||
if d & 2:
|
||||
queue.append((x,y-1))
|
||||
if d & 4:
|
||||
queue.append((x+1,y))
|
||||
if d & 8:
|
||||
queue.append((x,y+1))
|
||||
|
||||
del dirs1
|
||||
|
||||
# Link basins
|
||||
nsing = len(singular)
|
||||
links = {}
|
||||
def add_link(b0, b1, elev, bound):
|
||||
b = (min(b0,b1),max(b0,b1))
|
||||
if b not in links or links[b][0] > elev:
|
||||
links[b] = (elev, bound)
|
||||
|
||||
for x in range(X):
|
||||
b0 = basin_id[x,0]
|
||||
add_link(-1, b0, dem[x,0], (True, x, 0))
|
||||
for y in range(1,Y):
|
||||
b1 = basin_id[x,y]
|
||||
if b0 != b1:
|
||||
add_link(b0, b1, max(dem[x,y-1],dem[x,y]), (True, x, y))
|
||||
b0 = b1
|
||||
add_link(-1, b1, dem[x,Ymax], (True, x, Y))
|
||||
for y in range(Y):
|
||||
b0 = basin_id[0,y]
|
||||
add_link(-1, b0, dem[0,y], (False, 0, y))
|
||||
for x in range(1,X):
|
||||
b1 = basin_id[x,y]
|
||||
if b0 != b1:
|
||||
add_link(b0, b1, max(dem[x-1,y],dem[x,y]), (False, x, y))
|
||||
b0 = b1
|
||||
add_link(-1, b1, dem[Xmax,y], (False, X, y))
|
||||
|
||||
# Computing basin tree
|
||||
graph = planar_boruvka(links)
|
||||
|
||||
basin_links = defaultdict(dict)
|
||||
for elev, b1, b2, bound in graph:
|
||||
basin_links[b1][b2] = basin_links[b2][b1] = (elev, bound)
|
||||
basins = np.zeros(nsing+1)
|
||||
stack = [(-1, float('-inf'))]
|
||||
|
||||
# Applying basin flowing
|
||||
dir_reverse = (0, 3, 4, 1, 2)
|
||||
while stack:
|
||||
b1, elev1 = stack.pop()
|
||||
basins[b1] = elev1
|
||||
|
||||
for b2, (elev2, bound) in basin_links[b1].items():
|
||||
stack.append((b2, max(elev1, elev2)))
|
||||
|
||||
# Reverse flow direction in b2 (TODO)
|
||||
isY, x, y = bound
|
||||
backward = True # Whether water will escape the basin in +X/+Y direction
|
||||
if not (x < X and y < Y and basin_id[x,y] == b2):
|
||||
if isY:
|
||||
y -= 1
|
||||
else:
|
||||
x -= 1
|
||||
backward = False
|
||||
d = 2*backward + isY + 1
|
||||
while d > 0:
|
||||
d, dirs2[x,y] = dirs2[x,y], d
|
||||
if d == 1:
|
||||
x += 1
|
||||
elif d == 2:
|
||||
y += 1
|
||||
elif d == 3:
|
||||
x -= 1
|
||||
elif d == 4:
|
||||
y -= 1
|
||||
d = dir_reverse[d]
|
||||
|
||||
del basin_links[b2][b1]
|
||||
del basin_links[b1]
|
||||
|
||||
# Calculating water quantity
|
||||
dirs2[-1,:][dirs2[-1,:]==1] = 0
|
||||
dirs2[:,-1][dirs2[:,-1]==2] = 0
|
||||
dirs2[0,:][dirs2[0,:]==3] = 0
|
||||
dirs2[:,0][dirs2[:,0]==4] = 0
|
||||
|
||||
waterq = accumulate_flow(dirs2)
|
||||
|
||||
return dirs2, basins[basin_id], waterq
|
||||
|
||||
def accumulate_flow(dirs):
|
||||
ndonors = np.zeros(dirs.shape, dtype=int)
|
||||
ndonors[1:,:] += dirs[:-1,:] == 1
|
||||
ndonors[:,1:] += dirs[:,:-1] == 2
|
||||
ndonors[:-1,:] += dirs[1:,:] == 3
|
||||
ndonors[:,:-1] += dirs[:,1:] == 4
|
||||
waterq = np.ones(dirs.shape, dtype=int)
|
||||
|
||||
(X, Y) = dirs.shape
|
||||
rangeX = range(X)
|
||||
rangeY = range(Y)
|
||||
for x in rangeX:
|
||||
for y in rangeY:
|
||||
if ndonors[x,y] > 0:
|
||||
continue
|
||||
xw, yw = x, y
|
||||
w = waterq[xw, yw]
|
||||
while 1:
|
||||
d = dirs[xw, yw]
|
||||
if d <= 0:
|
||||
break
|
||||
elif d == 1:
|
||||
xw += 1
|
||||
elif d == 2:
|
||||
yw += 1
|
||||
elif d == 3:
|
||||
xw -= 1
|
||||
elif d == 4:
|
||||
yw -= 1
|
||||
|
||||
w += waterq[xw, yw]
|
||||
waterq[xw, yw] = w
|
||||
|
||||
if ndonors[xw, yw] > 1:
|
||||
ndonors[xw, yw] -= 1
|
||||
break
|
||||
|
||||
return waterq
|
||||
|
||||
def planar_boruvka(links):
|
||||
# Compute basin tree
|
||||
|
||||
basin_list = defaultdict(dict)
|
||||
|
||||
for (b1, b2), (elev, bound) in links.items():
|
||||
basin_list[b1][b2] = basin_list[b2][b1] = (elev, b1, b2, bound)
|
||||
|
||||
threshold = 8
|
||||
lowlevel = {}
|
||||
for k, v in basin_list.items():
|
||||
if len(v) <= threshold:
|
||||
lowlevel[k] = v
|
||||
|
||||
basin_graph = []
|
||||
n = len(basin_list)
|
||||
while n > 1:
|
||||
(b1, lnk1) = lowlevel.popitem()
|
||||
b2 = min(lnk1, key=lnk1.get)
|
||||
lnk2 = basin_list[b2]
|
||||
|
||||
# Add link to the graph
|
||||
basin_graph.append(lnk1[b2])
|
||||
|
||||
# Union : merge basin 1 into basin 2
|
||||
# First, delete the direct link
|
||||
del lnk1[b2]
|
||||
del lnk2[b1]
|
||||
|
||||
# Look for basin 1's neighbours, and add them to basin 2 if they have a lower pass
|
||||
for k, v in lnk1.items():
|
||||
bk = basin_list[k]
|
||||
if k in lnk2 and lnk2[k] < v:
|
||||
del bk[b1]
|
||||
else:
|
||||
lnk2[k] = v
|
||||
bk[b2] = bk.pop(b1)
|
||||
|
||||
if k not in lowlevel and len(bk) <= threshold:
|
||||
lowlevel[k] = bk
|
||||
|
||||
if b2 in lowlevel:
|
||||
if len(lnk2) > threshold:
|
||||
del lowlevel[b2]
|
||||
elif len(lnk2) <= threshold:
|
||||
lowlevel[b2] = lnk2
|
||||
del lnk1
|
||||
|
||||
n -= 1
|
||||
|
||||
return basin_graph
|
||||
|
|
@ -1,13 +0,0 @@
|
|||
import numpy as np
|
||||
import zlib
|
||||
|
||||
def save(data, fname, dtype=None):
|
||||
if dtype is not None:
|
||||
data = data.astype(dtype)
|
||||
|
||||
bin_data = data.tobytes()
|
||||
bin_data_comp = zlib.compress(bin_data, 9)
|
||||
if len(bin_data_comp) < len(bin_data):
|
||||
bin_data = bin_data_comp
|
||||
with open(fname, 'wb') as f:
|
||||
f.write(bin_data)
|
||||
|
|
@ -1,16 +0,0 @@
|
|||
import os.path
|
||||
|
||||
def read_config_file(fname):
|
||||
settings = {}
|
||||
|
||||
if not os.path.isfile(fname):
|
||||
return settings
|
||||
|
||||
with open(fname, 'r') as f:
|
||||
for line in f:
|
||||
slist = line.split('=', 1)
|
||||
if len(slist) >= 2:
|
||||
prefix, suffix = slist
|
||||
settings[prefix.strip()] = suffix.strip()
|
||||
|
||||
return settings
|
||||
|
|
@ -5,7 +5,7 @@ import zlib
|
|||
import sys
|
||||
import os
|
||||
|
||||
from terrainlib import stats, plot
|
||||
from view import stats, plot
|
||||
|
||||
scale = 1
|
||||
if len(sys.argv) > 1:
|
||||
|
|
|
|||
Loading…
Reference in New Issue