It draws a random 2D cross-section of Mandelbulb fractal.
Python, 51 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | # Random 2D Cross-section Of (3D) Mandelbulb Fractal
# http://en.wikipedia.org/wiki/Mandelbulb
# FB - 20120707
import math
import random
from PIL import Image
imgx = 512
imgy = 512
image = Image.new("RGB", (imgx, imgy))
pixels = image.load()
n = 8
# drawing area (xa < xb & ya < yb)
xa = -1.5
xb = 1.5
ya = -1.5
yb = 1.5
maxIt = 256 # max number of iterations allowed
pi2 = math.pi * 2.0
# random rotation angles to convert 2d plane to 3d plane
xy = random.random() * pi2
xz = random.random() * pi2
yz = random.random() * pi2
sxy = math.sin(xy) ; cxy = math.cos(xy)
sxz = math.sin(xz) ; cxz = math.cos(xz)
syz = math.sin(yz) ; cyz = math.cos(yz)
origx = (xa + xb) / 2.0 ; origy = (ya + yb) / 2.0
for ky in range(imgy):
b = ky * (yb - ya) / (imgy - 1) + ya
for kx in range(imgx):
a = kx * (xb - xa) / (imgx - 1) + xa
x = a ; y = b ; z = 0.0
# 3d rotation around center of the plane
x = x - origx ; y = y - origy
x0=x*cxy-y*sxy;y=x*sxy+y*cxy;x=x0 # xy-plane rotation
x0=x*cxz-z*sxz;z=x*sxz+z*cxz;x=x0 # xz-plane rotation
y0=y*cyz-z*syz;z=y*syz+z*cyz;y=y0 # yz-plane rotation
x = x + origx ; y = y + origy
cx = x ; cy = y ; cz = z
for i in range(maxIt):
r = math.sqrt(x * x + y * y + z * z)
t = math.atan2(math.hypot(x, y), z)
p = math.atan2(y, x)
rn = r ** n
x = rn * math.sin(t * n) * math.cos(p * n) + cx
y = rn * math.sin(t * n) * math.sin(p * n) + cy
z = rn * math.cos(t * n) + cz
if x * x + y * y + z * z > 4.0: break
pixels[kx, ky] = (i % 4 * 64, i % 8 * 32, i % 16 * 16)
image.save("Mandelbulb.png", "PNG")
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