unit script

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class Seeker : MonoBehaviour
{
    public List<Node> path = new List<Node>();
    public int cordsX, cordsY;
    Transform tr;
    void Start()
    {
        tr = transform;
        cordsX = Mathf.RoundToInt(tr.position.x);
        cordsY = Mathf.RoundToInt(tr.position.z);
    }
    public Animator anim;
    void LateUpdate()
    {
        if (path.Count > 1)
        {
            for (int i = 0; i < path.Count - 1; i++)
            {
                Debug.DrawLine(path[i].cords, path[i + 1].cords, Color.blue);
            }
            transform.position = Vector3.Lerp(transform.position, path[1].cords, Time.deltaTime * 4);
            if (Vector3.Distance(transform.position, path[1].cords) < 0.4f)
            {
                //stops units if their target is occupied. doesn't work perfectly
                if (path[1].occupied == null)
                {
                    if (path.Count <= 2)
                    {
                        path[0].occupied = this;
                    }
                    else
                    {
                        path.RemoveAt(0);
                    }
                }
                else
                {
                    Node cur = path[0];
                    path = new List<Node>();
                    path.Add(cur);
                    path[0].occupied = this;
                }
                cordsX = Mathf.RoundToInt(path[0].cords.x);
                cordsY = Mathf.RoundToInt(path[0].cords.z);
            }

            if (path.Count > 2)
            {
                transform.rotation = Quaternion.LookRotation(path[1].cords - transform.position);
                if (anim != null)
                {
                    anim.SetFloat("Speed", 1);
                }
            }
            else
            {
                anim.SetFloat("Speed", 0);
            }
        }
        if (Input.GetMouseButtonDown(0))
        {
            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit))
            {
                GeneratePathTo(hit.point);
            }
        }
        if (Input.GetMouseButtonDown(1))
        {
            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out hit))
            {
                if (PathfindingMap.Instance.nodeTypes.Length >= 2)
                {
                    NodeTemplate temp = PathfindingMap.Instance.nodeTypes[1];
                    Vector3 pos = new Vector3(Mathf.RoundToInt(hit.point.x), 0, Mathf.RoundToInt(hit.point.z));
                    Node node = PathfindingMap.VecToNode(pos);
                    node.inWorld.GetComponent<MeshRenderer>().material = temp.mat;
                    node.cost = temp.Cost;
                    node.enterable = temp.enterable;
                    PathfindingMap.Instance.grid.walls.Add(node.cords);
                }
            }
        }
    }
    public void GeneratePathTo(Vector3 _pos)
    {
        int x = Mathf.RoundToInt(_pos.x);
        int y = Mathf.RoundToInt(_pos.z);
        Vector3 pos = new Vector3(x, 0, y);
        List<Vector3> _path = new List<Vector3>();
        if (PathfindingMap.Instance.grid.Passable(pos))
        {
            AStarSearch search = new AStarSearch(PathfindingMap.Instance.grid, new Vector3(cordsX, 0, cordsY), pos);
            _path = search.FindShortestPath();
        }
        path = new List<Node>();
        for (int i = 0; i < _path.Count; i++)
        {
            path.Add(PathfindingMap.VecToNode(_path[i]));
        }
    }
}