What’s the result of this? A vector 5? Is that even possible?
Result of that is Vector 4. Top pin contains red, green and blue channels, bottom pin contains alpha channel.
Are FX_OceanWater_Tick4WaveGroups, FX_WrapGroupIndex, FX_OceanWater_CrossFadeWaveGroups, FX_OceanWater_PopulateWaveGroups used anywhere?
No, they are part of of dynamically adjusting ocean state and hopefully will be used in follow-up soon. Thanks for pointing out, I removed them from the project.
Which one is correct?
Technically, the one with division is correct, but on the grand scene of things, it is not that relevant.
Finally, I think the tutorial didn’t mention how to set all those parameters on the object itself.
Indeed. User parameters can be adjusted on an instance of niagara system component, which you have dropped into the level. I will add that part.