Are you talking about concentric ripples like Mark's example? Or are you talking about larger wave ripples?
There are many ways to do waves for a game. Are you making a game water surface?
If you make a tiled looped animated wave texture, this generally sucks because you see the tile repetitions across the large water surface.
Some games use a cheap simple approach of scrolling two maps... make a wave-pattern normal map and scroll it, then scroll the same map rotated at another angle and in another direction.
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There are many ways to do waves for a game. Are you making a game water surface?
If you make a tiled looped animated wave texture, this generally sucks because you see the tile repetitions across the large water surface.
Some games use a cheap simple approach of scrolling two maps... make a wave-pattern normal map and scroll it, then scroll the same map rotated at another angle and in another direction.