how to set Terrain SetHeights C#

ok on base of this article: Inserting heights in TerrainData

I’ve managed to get to this code

it doesn’t give me any error any longer but it doesn’t change anything either I want to deform it a bit

if I change

xBase + 500;

yBase - 500;

code still works with no error when I click on terrain but I still see no difference on the terrain

using UnityEngine;
using System.Collections;

public class Terraform : MonoBehaviour {
	public Terrain myTerrain ;
	public int xBase = 0;
	public int yBase = 0;
	void OnMouseDown () {
		myTerrain.terrainData.SetHeights(xBase,yBase,new float [myTerrain.terrainData.heightmapWidth , myTerrain.terrainData.heightmapHeight]);
	}
}

Terrain Width               64
Terrain Height              600
Terrain Length              64
Heightmap Resolution        65
Detail Resolution           1024
Detail Resolution per patch 8
Control Texture resolution  512
Base Texture Resolution     1024

I want to do it something similar to this: Destructible Terrain

at last I’ve got it

using UnityEngine;
using System.Collections;

public class Terraform : MonoBehaviour {
	public Terrain terrain ;
    public TerrainData tData;
     
    public int xRes ;
    public int yRes ;
	
	public float[,] heights;
	
	
	public Terrain myTerrain ;
	public int PlayerXi ;
	public int PlayerZi ;
	
	private GameObject Player ;

	void Start () {
		Player = GameObject.Find("Camera") ;
		
		tData = terrain.terrainData;
		
		xRes = tData.heightmapWidth;
		yRes = tData.heightmapHeight;
		
		//terrain.activeTerrain.heightmapMaximumLOD = 0;
		//something I didn't manage to translate from Java
	}

	void OnMouseDown() {
		// we convert float of our position x in to int
		PlayerXi = (int) Player.transform.position.x;
		// we convert float of our position z in to int
		PlayerZi = (int) Player.transform.position.z;
		
		// we tell heights how big the map is
		heights = tData.GetHeights(0, 0, xRes, yRes);
		
		// we set z in to x AND x in to y
		heights[PlayerZi,PlayerXi] = 0.01f;
		tData.SetHeights(0, 0, heights);
	}

IMPORTANT IF you want to be 1m/1m you need to have

Heightmap Resolution = Terrain Width + 1
// and if you have both different size I guess for
// 1 length you'll need to create a formula

IF I’m wrong please correct me but this code works thanks for all the help

IF anyone has simplest solution for setting where it should be deformed please post the code