zero? https://www.unrealengine.com/marketplace/en-US/assets?count=20&keywords=water&sortBy=relevancy&sortDir=DESC&start=0&tag=38 i guess similar content exists for different engines
I think generally it would help if you tried to explain in more detail what exactly you want achieve using what application/renderer, ideally with images/examples. If your talking about game art, I would probably start by looking for sample/existing content for which ever engine you want to use, as linked by Neox, and then…