import Blender
import Blender.Node
import math
from Blender import Noise

bN = Blender.Node

colout = (bN.RGBA, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0)
turb = (bN.VALUE, 0.25, 1.0, 1.0, 1.0,  0.0, 10.0)

node.output_def={'color':colout}
node.input_def = {'turb':turb}

texvec = node.tex_coord

def clouds(texvec, depth, hard, basis, amp, freq):
      return Noise.turbulence(texvec, depth, hard, basis, amp, freq)

col = node.inputs['turb'] * clouds(texvec, 2, 0, 1, 0.5, 2.0)

node.outputs['color'] = (col,col,col, 1.0)