// Script to move a NavMeshAgent to the place where
// the mouse is clicked.
    private var agent: NavMeshAgent;
    function Start () {
        agent = GetComponent.<NavMeshAgent>();
    }
    function Update () {
        var hit: RaycastHit;
        // When the mouse is clicked...    
        if (Input.GetMouseButtonDown(0)) {
            // If the click was on an object then set the agent's
            // destination to the point where the click occurred.
            var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            
            if (Physics.Raycast(ray, hit)) {
                agent.SetDestination(hit.point);
            }
        }
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    private NavMeshAgent agent;
    void Start() {
        agent = GetComponent<NavMeshAgent>();
    }
    void Update() {
        RaycastHit hit;
        if (Input.GetMouseButtonDown(0)) {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit))
                agent.SetDestination(hit.point);
            
        }
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    private agent as NavMeshAgent

    def Start():
        agent = GetComponent[of NavMeshAgent]()

    def Update():
        hit as RaycastHit
        if Input.GetMouseButtonDown(0):
            ray as Ray = Camera.main.ScreenPointToRay(Input.mousePosition)
            if Physics.Raycast(ray, hit):
                agent.SetDestination(hit.point)