My friend and I are working on a new UMS project which is going to be almost like a mix between Tree D and Defend the Temple, and I was wondering how I could go about creating triggers for the movement of the enemy units. We have 12 spawn points all over the map (if I could get a screen shot, this thing literally looks like a maze, it's crazy), and I have decided how I'm going to spawn these things, but I know that it would make for more strategic and interesting play if I could figure out a way to have triggers activate randomly for each wave where 12 spawns go, but they are at a random 12 locations (some doubling up), have that happen for every wave. The difference in this map from Defend the Temple and Tree D (and similar styled D games) is that human players won't have access to the track at any time. The enemy tracks and human tracks are completely separated and the human area is actually more defined by the end area, meaning it will be larger there and have all the beacons for powerups and all that, and then there are going to be beacons for transporting units to little strings alongside enemy tracks that you can attack early from, which is where this random trigger part would really come in handy because nobody would know exactly where they are going to be coming from and it would be almost like a guessing game.
Anyway, if this is possible, or if there is something else I can do that would give a remotely similar effect, that would be really cool. Thanks ahead of time.