RandomWalk.cs

using UnityEngine;
using UnityEngine.AI;

namespace Unity.AI.Navigation.Samples
{
    /// <summary>
    /// Walk to a random position and repeat
    /// </summary>
    [RequireComponent(typeof(NavMeshAgent))]
    public class RandomWalk : MonoBehaviour
    {
        public float m_Range = 25.0f;
        NavMeshAgent m_Agent;

        void Start()
        {
            m_Agent = GetComponent<NavMeshAgent>();
        }

        void Update()
        {
            if (m_Agent.pathPending || !m_Agent.isOnNavMesh || m_Agent.remainingDistance > 0.1f)
                return;

            m_Agent.destination = m_Range * Random.insideUnitCircle;
        }
    }
}