Hi everyone.. :) As you know there is no way to calculate vorticity in realflow "hybrido solver" (realflow Grid based simulation) even though "vorticity" gives us an excellent option to create an imitation of foam activity in water collision areas by rendering with Krakatoa KCM etc. So somehow I got an idea how to do it, and it just worked ..! I hope that is clear and understandable tutorial I’m pretty sure you do not want to hear my broken English .. Or that the tutorial will be in Hebrew :) Anyway .. Enjoy.. :)