How to scan for enemies?

Unity Engine
1

Hi! Need some help getting some game logic done, which is: how can you achieve that movable units scan/find enemy units next to them? In blender it could be done via using a “Near-Sensor”. This function always checked for objects within a certain distance. I am not sure how this can be achieved in Unity or the exact theory behind this:

I was told once that I probably need to create a huge list of all units in the game and then regularly need to do a distance between all of them. This however seems to be a very performance-breaking solution if you have 100 units. Isn’t there any better solution?

2

Solved… after some googling with different words: http://forum.unity3d.com/threads/45941-Looking-for-other-near-objects-and-return-them

3

Probably the fastest way is to use a trigger around the player, where you add objects to a list when the enter the trigger, and remove them when they exit.

–Eric