I was wondering how I would go about creating an effect that resembles a spherical wave. I have been trying to find a description but still have no proper way to describe it. The closest thing I have found to it is, http://youtu.be/VdIEwGkFckQ?t=1m25s from Assassin's creed. The effect I'm looking for would create a spherical wave from the player and show either the outline or vertices moving outward. (For a sphere this would be starting at the point on the sphere closest to the player and gradually becoming a circle as large as the sphere before disappearing behind the sphere).
Thanks for any help on this subject:)