and here is the geometry node. It's based on a YouTube Video from blender account. Why not particle system? because it's 4 mins + video. in order to cover all the video, I have to add a huge number of particle with metaball instance. It leads to a terrible performance. I only got 1 frame in my blender layout (6 particle system + Metaball merge). I'm not sure if the metaball or the total number particle drown my computer. so I move to geometry node. in somehow, I'm very comfortable with it, I used it a lot of in my previous project. Based on the video, I replace them with simple UV Mapped Sphere and added a bake node. For the bake node, the first time, I added the bake node in the end of the flow. Which created 20GB+ bake results. Which crash my laptop memory and storage (128GB memory consumption from blender). Then I change to only bake the points. Which only few Megabits.