Error with navAgent.velocity

Unity Engine
1

Hi all

I am getting an error message with this script, that I never got before when I used it in another project that has since been deleted.

Here is the script:

using UnityEngine;
using System.Collections;
using BehaviorDesigner.Runtime;
//using UnityEngine.AI.NavMeshAgent;


public class MovementScript : MonoBehaviour
{
    //link to Animator component
    public Animator animController;
    //used to set anim controller parameters
    public enum MoveState { Idle,Walking,Attack}
    public MoveState moveState;
    //link to NavMeshAgent component
    public UnityEngine.AI.NavMeshAgent navAgent;
    public BehaviorTree behaviorTree;
    private bool canSeePlayer;
    private bool canAttack;
    public float damageAmount;
 

    public void Start()
  
    {
        canSeePlayer = ((SharedBool)behaviorTree.GetVariable("Chase")).Value;
        canAttack = ((SharedBool)behaviorTree.GetVariable("Attack")).Value;           
     
    }
   
    // Update is called once per frame
    void Update()
    {
        //character walks if there is a navigation path set, idle all other times
        canSeePlayer = ((SharedBool)behaviorTree.GetVariable("Chase")).Value;
        canAttack = ((SharedBool)behaviorTree.GetVariable("Attack")).Value;



        if (canSeePlayer)

        {
            moveState = MoveState.Walking;
            print(moveState);
            print("I see you!");

            if (canAttack)
            {
                print("Attacking you!");
                moveState = MoveState.Attack;

            }


        }
        else
        {
            moveState = MoveState.Walking;
        }
              
        //send move state info to animator controller
        animController.SetInteger("MoveState", (int)moveState);

    }
    void OnAnimatorMove()
    {
        //only perform if walking
        if (moveState == MoveState.Walking)
        {
            print("In OnAnimatorMove Function");
            //set the navAgent's velocity to the velocity of the animation clip currently playing
            navAgent.velocity = animController.deltaPosition / Time.deltaTime;
          
            //smoothly rotate the character in the desired direction of motion
           Quaternion lookRotation = Quaternion.LookRotation(navAgent.desiredVelocity);
           transform.rotation = Quaternion.RotateTowards(transform.rotation, lookRotation, navAgent.angularSpeed * Time.deltaTime);
        }
    }
  
   
}

Here is the error that I am getting,

navmeshagent.velocity assign attempt for ‘creature1’ is not valid. Input velocity is { NaN, NaN, NaN }.
UnityEngine.AI.NavMeshAgent:set_velocity(Vector3)
MovementScript:OnAnimatorMove() (at Assets/Scipts/MovementScript.cs:71)

I am not sure why I am getting this and I am a basic C# coder, so I am not sure what NaN is, though I found in the Unity Answers it refers to Not A Number?

If I comment the navAgent.velocity line the code runs and my Agent moves but very quickly and I don’t get the error.

When I used this script in another project, I am sure I didn’t get this error.

This script is used with Behavior Designer in order to move an Agent across a NavMesh and to control which animation is played based on the Agent seeing the player and attack the player.

Thanks for any help

2

Maybe Time.deltaTime is 0, either through Time.scale being 0 or some other event, such that you’re dividing by zero resulting in NaN. That’s my only guess.