Why would you want to do that in Cesium? Is there a use case you’re working on, or just an interest question? Looks to me like animated pointclouds, not sure that’s feasable nor desirable in a platform like this, so I’d love to know why. 
Cheers,
Alex
Hey Alex
Just because of i’m trying to create some model Animations for my model to play, for example open the door and turn on the water.
So when i tried to do the animation that turn on the water, i thought it is wonderful if i can create the water flow effect by particle system in Blender, after that i tried but failed, so that is the reason 
Thanks for reply
Yeah, I don’t think a pre-rendered animation is the way to go, however there is a particle generator in Cesium you can do this with. Search in the Sandcastle for particle engine, there’s heaps of stuff you can do with it, including change its shape over time to simulate, for example, a waterfall.
Cheers,
Alex