I have a 'track' which is basically a turf with an Entered(). When a mob walks into it with certain veriables set, it auto walks them around it.
I have have added to the turfs Entered() the following;
for(var/obj/lane/duel/D in oview(10)) if(!D.activate) D.icon_state = D.icon_state_a
So while im walking around this track, and Entered() is being set off, all obj/lane/duel within a 10x10 view of the turf will switch their blank icon_state's to the objs set "icon_state_a" variable (but only if they dont have a mob linked to them).
Having the mob/activate is a good way since then when a mob leaves the server or whatever, i can search the world for obj's they affected and reset them. Ready for another player to affect.
Would this be a laggy way to deal with this? Is there a better way?
The whole point of this is to have an object 'do something' when a mob walks within a certain range of it with certain variables to give an effect a bit like below...
The object would be the "DUEL" and it would be invisible until a mob walks within range of it with a certain variables set.
So is this the best way i can hope for, or is there a more efficient way?