What is the difference between the effect of
In general, "up-to-down" changing is preferred to "left-to-right" changing for flip, animation, motion and morphing as the image will be clearer and the ghosting will be less. It is because our left and eye see same frame, or view, at the same time for "up-to-down" changing image but it is not the case for "left-to-right" changing effect.
Crystal012011