DDA does not agree with Mie for a sphere

[Tom Dimiduk]

sch = ImageSchema(shape=[100, 100], spacing=[0.10000000000000001, 0.10000000000000001], optics=Optics(wavelen=0.66, index=1.33, polarization=[1, 0], divergence=0.0), origin=[0.0, 0.0, 0.0])
sph = Sphere(n=1.59, r=0.5, center=(5, 5, 5))
hm = Mie.calc_holo(sph, sch)
hd = DDA.calc_holo(sph, sch)
hp.show(hm - hd)

These do not agree as well as they probably should. It appears there is a systemic offset in the center position.