initial import
--HG-- branch : stargen
This commit is contained in:
commit
3066899c07
3 changed files with 372 additions and 0 deletions
22
rnd.py
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22
rnd.py
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import random as random_lib
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import math
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def random():
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return random_lib.random()
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def gaussian(mean=0.0, stddev=1.0):
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while True:
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x1 = (2.0 * random()) - 1.0
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x2 = (2.0 * random()) - 1.0
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w = (x1 * x1) + (x2 * x2)
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if w < 1.0:
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break
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w = math.sqrt((-2.0 * math.log(w)) / w)
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return mean + (x1 * w * stddev)
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def randrange(min, max):
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return min + (random() * (max - min))
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176
stargen.py
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176
stargen.py
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from rnd import *
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import math
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systemsize = 6e9
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stars = (1.0, 0.5)
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planets = (8.0, 4.0)
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star_spectra = ['O', 'B', 'A', 'F', 'G', 'K', 'M']
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star_lumin = [(500000.0, 30000.0), (30000.0, 25.0), (25.0, 5.0), (5.0, 1.5), (1.5, 0.6), (0.6, 0.008), (0.08, 0.0008)]
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star_masses = [(40.0, 16.0), (16.0, 2.1), (2.1, 1.4), (1.4, 1.04), (1.04, 0.8), (0.8, 0.45), (0.45, 0.1)]
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star_radii = [(22.0, 8.0), (7.0, 1.8), (1.8, 1.4), (1.4, 1.15), (1.15, 0.96), (0.96, 0.7), (0.7, 0.25)]
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star_prob = [0.0, 0.05, 0.35, 0.6, 0.8, 0.97, 1.0]
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num_stars = round(gaussian(*stars))
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if num_stars < 1.0:
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num_stars = 1.0
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num_stars = int(num_stars)
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num_planets = round(gaussian(*planets))
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if num_planets < 0.0:
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num_planets = 0.0
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num_planets = int(num_planets)
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stars = []
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x = y = z = 0.0
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while len(stars) < num_stars:
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r = random()
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for i, e in enumerate(star_prob):
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if r <= e:
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si = i
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break
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r = random()
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slumin = (star_lumin[si][1] * 0.8) + (star_masses[si][0] * 1.2 * r)
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r2 = r + (random() * 0.3) - 0.15
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smass = (star_masses[si][1] * 0.8) + (star_masses[si][0] * 1.2 * r)
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r2 = r + (random() * 0.3) - 0.15
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sradius = (star_radii[si][1] * 0.8) + (star_radii[si][0] * 1.2 * r)
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print "Star lumin %s mass %s class %s" % (slumin, smass, star_spectra[si])
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stars += [(slumin, smass, star_spectra[si], sradius, x, y, z)]
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# first star is always at 0.0, 0.0, 0.0, next star gets random coords
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x = gaussian(0.0, systemsize)
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y = gaussian(0.0, systemsize)
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if len(stars) > 1:
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z = gaussian(0.0, systemsize / 10e3)
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4
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planets = []
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sys_size = math.sqrt(sys_lumin)
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while len(planets) < num_planets:
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def dist(x, y, z):
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return math.sqrt(x**2 + y**2 + z**2)
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x = gaussian(0.0, systemsize * sys_size)
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y = gaussian(0.0, systemsize * sys_size)
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z = gaussian(0.0, systemsize * sys_size / 10e3)
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reject = False
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for star in stars:
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slumin, smass, sclass, sradius, sx, sy, sz
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d = dist(x-sx,y-sy,z-sz)
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deathzone = sradius + (sradius * 0.25 * math.sqrt(slumin))
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if d < deathzone:
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reject = True
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if reject:
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continue
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r = random()
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rocky = False
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gas_giant = False
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if r < 0.6:
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# rock planet
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rocky = True
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massmin = 1.0e19
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massmax = 8.8e25
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mass = 0.0
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while mass < massmin or mass > massmax:
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massexp = gaussian(24.5, 1.25)
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mass = 10.0 ** massexp
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density = 0.0
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while density < 0.75:
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density = gaussian(4.5, 1.0)
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mag = -1.0
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while mag < 0.0:
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mag = gaussian(density, 3.0)
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else:
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# gas giant
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gas_giant = True
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massmin = 1e25
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massmax = 4e28
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mass = 0.0
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while mass < massmin or mass > massmax:
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massexp = gaussian(26.5, 1.0)
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mass = 10.0 ** massexp
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density = 0.0
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while density < 0.3:
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density = gaussian(1.5, 0.75)
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mag = -1.0
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while mag < 2.0:
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mag = gaussian(7.0, 3.0)
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volume = mass / density / 1e12
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radius = pow(volume * 0.75 / math.pi, 1.0/3.0)
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circsurfarea = math.pi * radius**2
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surfarea = circsurfarea * 4.0
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insol = 0.0
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for star in stars:
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slumin, smass, sclass, sradius, sx, sy, sz
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d = dist(x-sx,y-sy,z-sz)
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spower = 3.8e26 * slumin
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distsphere = 4.0 * math.pi * d**2
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insol += (circsurfarea / distsphere) * spower
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areainsol = insol / surfarea / 1e6
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if areainsol > 75000:
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continue
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atmo = None
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while atmo == None or atmo > density:
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if gas_giant:
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atmo_exp = randrange(-3, 0.5)
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else:
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atmo_exp = randrange(-9.2, -0.9)
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atmo = 10 ** atmo_exp
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albedo = -1.0
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while albedo < 0.0 or albedo > 1.0:
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albedo = gaussian(0.35, 0.05)
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emissivity = 1.0 - albedo
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emissivity = randrange(0.00001, 1.0)
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emiss_diff = (((10.0 - pow(atmo, 1.0/4.0)) / 10.0) ** 100.0) / 2.0
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emissivity_min = emissivity - (emissivity * emiss_diff)
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emissivity_max = emissivity + (emissivity * emiss_diff)
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avg_temp = pow(((1.0 - albedo) * areainsol) / (4.0 * emissivity * 5.67e-8), 1.0/4.0)
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min_temp = pow(((1.0 - albedo) * areainsol) / (4.0 * emissivity_min * 5.67e-8), 1.0/4.0)
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max_temp = pow(((1.0 - albedo) * areainsol) / (4.0 * emissivity_max * 5.67e-8), 1.0/4.0)
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174
stargen.py.bak
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174
stargen.py.bak
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from rnd import *
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import math
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systemsize = 6e9
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stars = (1.0, 0.5)
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planets = (8.0, 4.0)
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star_spectra = ['O', 'B', 'A', 'F', 'G', 'K', 'M']
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star_lumin = [(500000.0, 30000.0), (30000.0, 25.0), (25.0, 5.0), (5.0, 1.5), (1.5, 0.6), (0.6, 0.008), (0.08, 0.0008)]
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star_masses = [(40.0, 16.0), (16.0, 2.1), (2.1, 1.4), (1.4, 1.04), (1.04, 0.8), (0.8, 0.45), (0.45, 0.1)]
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star_radii = [(22.0, 8.0), (7.0, 1.8), (1.8, 1.4), (1.4, 1.15), (1.15, 0.96), (0.96, 0.7), (0.7, 0.25)]
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star_prob = [0.0, 0.05, 0.35, 0.6, 0.8, 0.97, 1.0]
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num_stars = round(gaussian(*stars))
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if num_stars < 1.0:
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num_stars = 1.0
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num_stars = int(num_stars)
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num_planets = round(gaussian(*planets))
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if num_planets < 0.0:
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num_planets = 0.0
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num_planets = int(num_planets)
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stars = []
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x = y = z = 0.0
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while len(stars) < num_stars:
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r = random()
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for i, e in enumerate(star_prob):
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if r <= e:
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si = i
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break
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r = random()
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slumin = (star_lumin[si][1] * 0.8) + (star_masses[si][0] * 1.2 * r)
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r2 = r + (random() * 0.3) - 0.15
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smass = (star_masses[si][1] * 0.8) + (star_masses[si][0] * 1.2 * r)
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r2 = r + (random() * 0.3) - 0.15
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sradius = (star_radii[si][1] * 0.8) + (star_radii[si][0] * 1.2 * r)
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print "Star lumin %s mass %s class %s" % (slumin, smass, star_spectra[si])
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stars += [(slumin, smass, star_spectra[si], sradius, x, y, z)]
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# first star is always at 0.0, 0.0, 0.0, next star gets random coords
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x = gaussian(0.0, systemsize)
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y = gaussian(0.0, systemsize)
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if len(stars) > 1:
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z = gaussian(0.0, systemsize / 10e3)
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planets = []
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sys_size = math.sqrt(sys_lumin)
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while len(planets) < num_planets:
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def dist(x, y, z):
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return math.sqrt(x**2 + y**2 + z**2)
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x = gaussian(0.0, systemsize * sys_size)
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y = gaussian(0.0, systemsize * sys_size)
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z = gaussian(0.0, systemsize * sys_size / 10e3)
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reject = False
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for star in stars:
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slumin, smass, sclass, sradius, sx, sy, sz
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d = dist(x-sx,y-sy,z-sz)
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deathzone = sradius + (sradius * 0.25 * math.sqrt(slumin))
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if d < deathzone:
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reject = True
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if reject:
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continue
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r = random()
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rocky = False
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gas_giant = False
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if r < 0.6:
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# rock planet
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rocky = True
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massmin = 1.0e19
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massmax = 8.8e25
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mass = 0.0
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while mass < massmin or mass > massmax:
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massexp = gaussian(24.5, 1.25)
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mass = 10.0 ** massexp
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density = 0.0
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while density < 0.75:
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density = gaussian(4.5, 1.0)
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mag = -1.0
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while mag < 0.0:
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mag = gaussian(density, 3.0)
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else:
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# gas giant
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gas_giant = True
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massmin = 1e25
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massmax = 4e28
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mass = 0.0
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while mass < massmin or mass > massmax:
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massexp = gaussian(26.5, 1.0)
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mass = 10.0 ** massexp
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density = 0.0
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while density < 0.3:
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density = gaussian(1.5, 0.75)
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mag = -1.0
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while mag < 2.0:
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mag = gaussian(7.0, 3.0)
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volume = mass / density / 1e12
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radius = pow(volume * 0.75 / math.pi, 1.0/3.0)
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circsurfarea = math.pi * radius**2
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surfarea = circsurfarea * 4.0
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insol = 0.0
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for star in stars:
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slumin, smass, sclass, sradius, sx, sy, sz
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d = dist(x-sx,y-sy,z-sz)
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spower = 3.8e26 * slumin
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distsphere = 4.0 * math.pi * d**2
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insol += (circsurfarea / distsphere) * spower
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areainsol = insol / surfarea / 1e6
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if areainsol > 75000:
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continue
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atmo = None
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while atmo == None or atmo > density:
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if gas_giant:
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atmo_exp = randrange(-3, 0.5)
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else:
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atmo_exp = randrange(-9.2, -0.9)
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atmo = 10 ** atmo_exp
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albedo = -1.0
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while albedo < 0.0 or albedo > 1.0:
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albedo = gaussian(0.35, 0.05)
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emissivity = 1.0 - albedo
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emissivity = randrange(0.00001, 1.0)
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emiss_diff = (((10.0 - pow(atmo, 1.0/4.0)) / 10.0) ** 100.0) / 2.0
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emissivity_min = emissivity - (emissivity * emiss_diff)
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emissivity_max = emissivity + (emissivity * emiss_diff)
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avg_temp = pow(((1.0 - albedo) * areainsol) / (4.0 * emissivity * 5.67e-8), 1.0/4.0)
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min_temp = pow(((1.0 - albedo) * areainsol) / (4.0 * emissivity_min * 5.67e-8), 1.0/4.0)
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max_temp = pow(((1.0 - albedo) * areainsol) / (4.0 * emissivity_max * 5.67e-8), 1.0/4.0)
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