As far as I can see right now there is no way to access data from other particles in the current system. This currently makes creating effects like chains or tentacles impossible since you need constraints between the different particles.
The video that made me come back to this topic and shows some great examples (they use unreal, probably niagra)
They actually use a custom VFX system built in-house, not niagra
but it’s true, niagara, at least a recent version maybe only in UE5, particles can communicate between each other. This opens up many cool things.
