Sometimes the coins collide and clip, I am not sure how to fix this.
I’m just starting to learn UE4 myself, but could you scale them down rapidly as they get near the ground? I think if they’re translucent, you could use DepthFade in the material to fade them out as they approach the ground surface instead as well - A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums