How to do it...

To make a group of objects flock together, please follow these steps:

1. Create a Material object in the Project window and name it m_green, with Main Color tinted green.
2. Create a Material object in the Project window and name it m_yellow, with Main Color tinted yellow.
3. Create a 3D Cube GameObject named Cube-drone at (0,0,0). Drag the m_yellow material into this object.

4. Add a Navigation | NavMeshAgent component to Cube-drone. Set the Stopping Distance property of the NavMeshAgent component to 2.
5. Add a Physics RigidBody component to Cube-drone with the following properties:
   • Mass is 1
   • Drag is 0
   • Angular Drag is 0.05
   • Use Gravity and Is Kinematic are both unchecked
   • Constraints Freeze Position: Check the Y-axis
6. Create the following Drone C# script class and add an instance object as a component to the Cube-drone GameObject:

 using UnityEngine;
 using UnityEngine.AI;

 public class Drone : MonoBehaviour {
    private NavMeshAgent...