Some Questions About Obi Fluid

[relevantname]

1.- The particle baker was removed in 5.0, because Unity now has Alembic import support which serves the same purpose but is much better. The current version in the store is 5.2.
2.- This is called tunneling. See: https://www.youtube.com/watch?v=ms0Z35GY6pk
3.- Yes, use a fluid emitter shape (or combination of shapes), along with "burst" emission mode in the emitter. This will emit as many particles as the shape requires at once, when the emitter is awaken.

Thanks for the answer, I'm using Obi Fluid 4.1. 

What I want to know is what is particle baker is and what is the purpose of using it? I imagine that, it is something like for example recording the fluid effect and then using this in the game without emitting any real time particles.

Thank you again.