tower having an attack range of tiles

Questions & Answers
1

what would be the ideal solution to having a tower with a range of tiles. for example, the tower is placed on [0,0] and if there are enemies on tile [0,1] or [0,2] the tower will attack one of these enemies. I could give enemies a boxcollider and the towers custom boxcolliders with a rigidbody however I feel like there should be a better solution without the need of rigidbodies for the enemies or tower since they are heavy on performance… anyone any ideas for what the best approach would be?

2

If it’s turn based, I would check every time an enemy moves to see if the new position is on said tiles. If it is a question of frame by frame monitoring, than I would say collisions or distance checks are your best bet. The option for distance:

if(Vector3.Distance(tower.transform.position, enemy.transform.position) <= tileSpread){
    //enemy close
}
//or a bit faster with square magnitude
if((tower.transform.position - enemy.transform.position).sqrMagnitude <= tileSpread){
    //enemy close
}