import Blender

tex = Blender.Texture.GetCurrentPytex()
coords = tex.getPytexCoords()

def magnitude( a ):
	return ( a[0]**2 + a[1]**2 + a[2]**2)**0.5

def scale( a ):
	return a / 1.4142

a = scale( magnitude( coords ) )
tex.setPytexIntensity(a)