Персонаж скользит по поверхности

 using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
 
public class EnemyController : MonoBehaviour
{
    public float patrolTime = 15;
    public float aggroRange = 10;
    public Transform[] waypoints;
 
    int index;
    float speed, agentSpeed;
    Transform player;
 
    Animator animator;
    NavMeshAgent agent;
 
 
    private void Awake()
    {
        animator = GetComponent<Animator>();
 
        agent = GetComponent<NavMeshAgent>();
 
        if (agent != null)
            agentSpeed = agent.speed;
 
        player = GameObject.FindGameObjectWithTag("Player").transform;
 
        index = Random.Range(0, waypoints.Length);
 
        InvokeRepeating("Tick", 0, 0.5f);
 
        if(waypoints.Length >0)
        {
            InvokeRepeating("Patrol", 0, patrolTime);
        }
    }
 
    void Update()
    {
        animator.SetFloat("Speed", agent.velocity.magnitude);
    }
 
    void Patrol()
    {
        index = index == waypoints.Length - 1 ? 0 : index + 1;
    }
 
    void Tick()
    {
        agent.destination = waypoints[index].position;
        agent.speed = agentSpeed / 2;
 
        if (player != null && Vector3.Distance(transform.position, player.transform.position) < aggroRange)
        {
            agent.destination = player.position;
            agent.speed = agentSpeed;
        }
        
    }
}