from maya.cmds import polyCube,xform
from math import cos,sin

def tree(x,y,z,a,b,l,w,r,s,it,lvl=0):
    if(lvl<it):
        polyCube(h=l,w=w,d=w)
        xform(relative=1,
              translation=(x,y,z),
              rotation=(-50*b,0,90+a*50),
              pivots=(0,l*.5,0)
              )
        x2 = x + l*cos(a)*cos(b)
        y2 = y + l*cos(a)*sin(b)
        z2 = z + l*sin(a)
        tree(x2,y2,z2,a+s,b,l*r,w*r,r,s,it,lvl+1)
        tree(x2,y2,z2,a-s,b,l*r,w*r,r,s,it,lvl+1)
        tree(x2,y2,z2,a,b+s,l*r,w*r,r,s,it,lvl+1)
        tree(x2,y2,z2,a,b-s,l*r,w*r,r,s,it,lvl+1)

tree(0,0,0,     # position
     0,0,       # angle (alpha,beta)
     1.0,.1,    # size (length,width)
     .7,        # size factor
     1,         # spreading (0<x<pi/2)
     5)         # iterations