Custom Nav Mesh Avoidance to replace default one.

This is simple avoidance implementation to prevent situation when nav mesh agents moving too close to each other. This algorithm is best suitable for average crowds of 10-100 agents. Not tested with bigger amounts.

You can combine this Avoidance with default one (agents will never move through each other) or disable Unity's avoidance (avoidance will look smoother, but agents will be able to move through each other).

You can install plugin via Unity Package Manager as git package from github repository:

https://github.com/OlegDzhuraev/NavMeshAvoidance.git

You also can download it directly from github and place into Assets folder.

First of all, add Avoidance component to any GameObject (once). Next, when you spawn any agent, you need to add it to the Avoidance class like this:

using NavMeshAvoidance;
using UnityEngine;
using UnityEngine.AI;

public class AvoidingAgent : MonoBehaviour
{
  [SerializeField] Avoidance Avoidance;

  void Start()
  {
    var agent = GetComponent<NavMeshAgent>();

    Avoidance.AddAgent(agent);
  }
}

And now it will work with avoidance of others agents.

You also can disable default avoidance. In this case agents will sometimes move through each other, but in priority for them will be to avoid others. Idea of disabling default avoidance is better navigation without "friction", which can be noticed when using default avoidance and 2 or more agents try to move through other one.

When destroying any agent, dont forget to remove it from avoidance too:

Avoidance.RemoveAgent(agent);

Basic classes added as controls example for agents groups. You can ignore these scripts if you have your own group controls.

Check SampleScene to see Avoidance work example.