Линии над terrain невидимы

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
 
public class LineCreator : MonoBehaviour {
 
    public TerrainData processedTerrian;
 
    //bool lineCreated = false;
 
    // Use this for initialization
    void Start () {
        LineRenderer net;
        net = GetComponent<LineRenderer>();
        net.SetVertexCount(40);
        net.SetWidth(10, 10);
        net.material = new Material(Shader.Find("Particles/Additive"));
        int j = 0;
        for (int i = 0; i < 20; i++)
        {
            net.SetPosition(j, new Vector3((processedTerrian.size.x / 20) * i -100, -100, -100));
            j++;
            net.SetPosition(j, new Vector3((processedTerrian.size.x / 20) * i -100, -100, processedTerrian.size.z -100));
            j++;
            i++;
            net.SetPosition(j, new Vector3((processedTerrian.size.x / 20) * i -100, -100, processedTerrian.size.z -100));
            j++;
            net.SetPosition(j, new Vector3((processedTerrian.size.x / 20) * i -100, -100, -100));
            j++;
        }
    }
    
    // Update is called once per frame
    void Update () {
        
    }
    private void OnDrawGizmos()
    {
 
    }
}