Setting GameObject position doesn't work with NavMesh

My code creates a unit. I need to detect if the collider is inside another collider. (I.e. if it is, I'll try random nearby locations next) I cannot use OnTriggerEnter/Exit, as that would take a frame for every test position.

Details:

I have an RTS, and the AI is generating units. The building has a box collider and a NavMeshObstacle component. The Unit has a Sphere Collider and a NavMeshAgent.

It always creates the Unit at the center of the base. I validated upon initial creation, that the point is the center or the target building.

At one point on the map, this works perfectly. It pushes the drone unit out of the building, and it appears in front. As shown in this clip: http://screencast.com/t/fQPBd6Ku


The problem. For some reason, with the building at another point on the map, the drone unit shows up halfway across the map. as shown in this clip: http://screencast.com/t/F5S3TvP8


- Thanks for any help.

 

I found the issue!

Here is the code I originally had:
- var go = GameObject.Instantiate(DronePrefab);
- go.transform.position = target;

The problem was that when an object is instantiated with the NavMeshAgent, it does some sort of a lock on its position. Then, when I set the position, it determines there was a mountain in the way, and acts like the vechicle was pushed into the mountain, pulling it back to that edge. The only reason the first location worked, was because the building was close to where the prefab was created.

The solution:
var go = (GameObject)GameObject.Instantiate(DronePrefab, target, DronePrefab.transform.position);

 

You could also use the NavMeshAgent's Warp method.

NavMeshAgents does not want to have their transform's position manipulated directly. That usually leads to a bunch of issues.