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removes equator, achieves uniform distribution of stars implementing rejection sampling, adds UNIX script header

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tosh 2013-05-09 12:08:19 +02:00
parent 408a21b515
commit 395e4a7852
1 changed files with 10 additions and 5 deletions
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15
interface/resources/gen_stars.py
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@ -1,3 +1,5 @@
#!/usr/bin/env python
#
# gen_stars.py
# interface
@ -12,7 +14,7 @@ from random import random,randint
from math import sqrt, hypot, atan2, pi, fmod, degrees
from sys import argv,stderr
hemisphere_only, equator, meridians= False, 1000, 1000
hemisphere_only, equator, meridians= False, 0, 1000
n_random = 100000
if len(argv) > 1:
@ -50,10 +52,13 @@ for i in range(n_random):
g = max(0,min(255,w + randint(-20,60)))
b = max(0,min(255,w + randint(-10,100)))
# position
x,y,z = random()*2-1,random(),random()*2-1
if not hemisphere_only:
y = y*2-1
l = sqrt(x*x + y*y + z*z)
while True:
x,y,z = random()*2-1,random(),random()*2-1
if not hemisphere_only:
y = y*2-1
l = sqrt(x*x + y*y + z*z)
if l <= 1.0:
break
x /= l; y /= l; z /= l
xz = hypot(x,z)