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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 # gen_stars.py
# interface # interface
@ -12,7 +14,7 @@ from random import random,randint
from math import sqrt, hypot, atan2, pi, fmod, degrees from math import sqrt, hypot, atan2, pi, fmod, degrees
from sys import argv,stderr from sys import argv,stderr
hemisphere_only, equator, meridians= False, 1000, 1000 hemisphere_only, equator, meridians= False, 0, 1000
n_random = 100000 n_random = 100000
if len(argv) > 1: if len(argv) > 1:
@ -50,10 +52,13 @@ for i in range(n_random):
g = max(0,min(255,w + randint(-20,60))) g = max(0,min(255,w + randint(-20,60)))
b = max(0,min(255,w + randint(-10,100))) b = max(0,min(255,w + randint(-10,100)))
# position # position
x,y,z = random()*2-1,random(),random()*2-1 while True:
if not hemisphere_only: x,y,z = random()*2-1,random(),random()*2-1
y = y*2-1 if not hemisphere_only:
l = sqrt(x*x + y*y + z*z) y = y*2-1
l = sqrt(x*x + y*y + z*z)
if l <= 1.0:
break
x /= l; y /= l; z /= l x /= l; y /= l; z /= l
xz = hypot(x,z) xz = hypot(x,z)