I dont really care if its color coded or arrows. However arrows is standard since 34 years - and i think it might make sense - but who cares - its like inventing a depth buffer and discussing the red look to it. I think its not the point.
@sanch- what u see there is the cuda implementation of standard optical flow IMHO - its not a 3d vectorfield - its 2D - however still impressive - and most definitly what im looking for too.
if you are interested in 3d Flow from 2 1/2D images then please search for "SCENE FLOW"
To me this is one of the best examples i saw so far. But i dont know someone that can pull this off.