Fractal aurora(Koch curve)

Hi, it is NISHIO Hirokazu. I wondered how we see if there is aurora in Koch curve. So I wrote a python script run on Blender. Let see it(click to enlarge):



The script is as follow. It is not beautifil because I'm just a beginner of Blender. A lot of lines are copy of sample.

from Blender.Mathutils import Vector
from Blender import *
from math import sin, cos, pi

class Turtle(object):
    def __init__(self):
        self.x = 0.0
        self.y = 0.0
        self.dirx = 1.0
        self.diry = 0.0
        self.vert2d_list = [(0.0, 0.0)]
        self.faces = []

    def forward(self, mag):
        self.x += self.dirx * mag 
        self.y += self.diry * mag 
        self.vert2d_list.append((self.x, self.y))

    def rot(self, rad):
        self.dirx, self.diry = (
            self.dirx * cos(rad) - self.diry * sin(rad),
            self.dirx * sin(rad) + self.diry * cos(rad))
    
    def build_mesh(self, z=0.0, name="Mesh"):
        verts3d = [Vector(x, y, z) for (x, y) in self.vert2d_list]
        me = Mesh.New(name + str(z))          # create a new mesh
        me.verts.extend(verts3d)          # add vertices to mesh
        me.faces.extend(self.faces)           # add faces to the mesh (also adds edges)
        return me

def deg(x):
    return 2 * pi / 360 * x

def makeHalo(x):
    mat = Material.New('Halo')          # create a new Material called 'newMat'
    mat.rgbCol = [0.7 * x, 0.7, 0.1]          # change its color
    mat.setAlpha(0.3 * (1 - x))                     # mat.alpha = 0.2 -- almost transparent
    #mat.emit = 0.7                        # equivalent to mat.setEmit(0.8)
    #mat.mode |= Material.Modes.ZTRANSP    # turn on Z-Buffer transparency
    #mat.setAdd(0.8)                       # make it glow
    mat.setMode('Halo')                   # turn 'Halo' "on" and all others "off"
    return mat

def koch(level=1, unit=1):
    if level == 0:
        turtle.forward(unit)
    else:
        koch(level - 1, unit)
        turtle.rot(deg(60))
        koch(level - 1, unit)
        turtle.rot(deg(-120))
        koch(level - 1, unit)
        turtle.rot(deg(60))
        koch(level - 1, unit)
        

turtle = Turtle()
koch(4, 0.6)

for i in range(100):
    ob = Object.New('Mesh', 'myObj')  # link mesh to an object
    m = turtle.build_mesh(i / 5.0)
    m.materials += [makeHalo(i / 100.0)]
    ob.link(m)

    sc = Scene.GetCurrent()          # link object to current scene
    sc.link(ob)