placement blocking @ runtime

Hello everyone,


I am pretty new in this so please bear with me, I tries also to search online for this topic but unfortunately could not find something similar. I appreciate every bit of help.


I am doing a project where waves of enemies go from point A to B.

In the time the enemies spawn and walk, you can build on the Terrain, and the enemies still go to point B and do not collide with the buildings. My issue or what I cannot Figure out at the Moment is , how to make it possible so that the Player cannot block the way of the path completely . Meaning that at least 1 placement needs to be free so that the enemies can walk and evade collision with the Building.

I tried to do it with navmesch at runtime, Works well just the blocking part I am stuck and do not know how to go about that. Is there a magic way to do this?


Thank you so much for any advice


Best Regards

 

Whenever a player is about to build you could drop a nav mesh obstacle in the place they want to build and then use NavMesh.CalculatePath() and pass in your positions A and B. If the calculated path is partial the Ai is blocked and you can prevent your player from building there.

 

Thank you so much , I am going to try that.