Huud

# A fast - numpy based - CPU functions that take a height map and generate a normal map from it

import numpy as np
import matplotlib.image as mpimg

# a function that takes a vector - three numbers - and normalize it, i.e make it's length = 1
def normalizeRGB(vec):
    length = np.sqrt(vec[:,:,0]**2 + vec[:,:,1]**2 + vec[:,:,2]**2)
    vec[:,:,0] = vec[:,:,0] / length
    vec[:,:,1] = vec[:,:,1] / length