The Ripple modifier produces a concentric rippling effect in an objects geometry. You can set either of two ripples or their combination. Ripple uses a standard gizmo and center, which you can transform to increase the possible ripple effects.
The Ripple space warp has similar features. It is useful for applying effects to a large number of objects.
Ripple modifier applied
Amplitude 1/ Amplitude 2: Amplitude 1 produces a ripple across the object in one direction, while Amplitude 2 creates a similar ripple at right angles to the first.
Wave Length: Specifies the distance between the peaks of the wave. The greater the length, the smoother and more shallow the ripple for a given amplitude.
Phase: Shifts the ripple pattern over the object. Positive numbers move the pattern inward, while negative numbers move it outward. This effect is especially clear when animated.
Decay: Limits the effect of the wave generated from its center. A default decay of zero means that the wave will generate infinitely from its center. Increasing the decay value reduces the distance that the wave is generated. A negative decay value increases the amplitude at increasing distance from the center. Even small negative values can have a large effect on the outer edges of a ripple.
Amplitude 1 produces a ripple across the object in one direction; Amplitude 2 creates a similar ripple at right angles to 1.
The greater the length, the smoother and more shallow the ripple for a given amplitude.
Phase effect on Ripple
A positive decay value decreases the amplitude at increasing distance from the center. As this value increases, the ripple is concentrated at the center and flattened until it disappears (completely decays).
A negative decay value increases the amplitude at increasing distance from the center. Even small negative values can have a large effect on the outer edges of a ripple.