You’ll have to kill them eventually because otherwise the resource usage will spiral out of control.
AFAIK you shouldn’t see garbage collection sweeping them up if you actually define a lifetime for them, so do that. Define, say, a 120 second lifetime, or something else suitably long-lasting for what you’re doing.
The advantage to doing this is that by doing so, they’ll die one at a time (rather inconspicuously) instead of all being mass-swept away by garbage collection. I had to do this with bullet hole decals and physics particles that come to rest; if you try to make them last forever, eventually they’ll all get mass-collected as garbage. But if you define them as having a lifetime, they’ll survive periodic garbage collection and will die corresponding to when they were spawned, which means there are almost always a bunch of them around, making it essentially impossible to notice the ones that disappear (unless you happen to catch a glimpse of one right at that critical moment or have a really good instinct for how quickly an arena should fill up with decals and detritus)
Granted the array method might make them last forever, but be careful doing that as you can very quickly wind up with an unmanageable number of decals (not necessarily just for memory reasons, but aesthetic ones as well)
Thanks man thats good to know. Thanks for the reply.