hi everyone
i use cell fracture to shatter cup
and use rigid body to animate and bake key frames and i want to use these parts for obstacle in fluid sim
but more than 256 and when join all part each animate was convert to on,it’s move like one cup
how can solve it…

Just don’t make all your fractured pieces obstacles. Only use the big pieces and a few of the small ones. Everything is moving so fast that no one will be able to tell that some of the pieces aren’t interacting with the fluid. In fact, I suspect that you could use only between 10 and 20 pieces and it would still look fine.