Replying to a few comments. Yes Water in 4.26 preview 3 is a bit rough, we are working on it!
>>Seems like the Fluidsim bp is broken for me. The node for “Get first actor in class” seems to not exist. Do i have something not enabled?
This bug is due to accidentally using a node from the “Volumetrics” plugin. It will be fixed (replaced with similar “Get Actor of Class”). You can either enable Volumetrics plugin or replace that node for now.
>>Generate Spectrum function is missing from GerstnerWaveController_BP, along with the blueprint trying to use nonexistent connections.
We no longer need the GerstnerWaveController_BP. Its is not used for anything and is in the middle of being removed. We now generate wave using the Gerstner Wave Generator class which can be applied directly on waterbodies.
>>But in **4.26 Water And Volumetrics Preview tutorial **we can see there is yellow circle tool too. I don’t have such tool in UE 4.26 Preview 3
That is because for the stream, I switched the Ocean material to be Masked. That caused the selection outline to get a more accurate shape. That said, masked is an expensive solution and we have a better solution that only clips the selection outline shader itself.