Making terrain flat under an object [Script][Probleme with script]

Hey guys! I am having this probleme with a script i found and edited a little i am trying to use a raycast to find the distance between the object and the terrain and then set the terrain flat at that location it kinda works but i only get high pillars i guess that i need to do something with the hit.distance i get here is the script

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Straighttheterrain : MonoBehaviour {
5.     Terrain terr; // terrain to modify
6.     int hmWidth; // heightmap width
7.     int hmHeight; // heightmap height
8.    
9.     int posXInTerrain; // position of the game object in terrain width (x axis)
10.     int posZInTerrain; // position of the game object in terrain height (y axis)
11.    
12.     int size = 100; // the diameter of terrain portion that will raise under the game object
13.     float desiredHeight = 0; // the height we want that portion of terrain to be
14.  
15.     bool updated;
16.    
17.     void Start () {
18.         terr = Terrain.activeTerrain;
19.         hmWidth = terr.terrainData.heightmapWidth;
20.         hmHeight = terr.terrainData.heightmapHeight;
21.        
22.     }
23.    
24.     void Update () {
25.         if(!updated) {
26.             RaycastHit hit;
27.             if (Physics.Raycast(transform.position, -Vector3.up, out hit)){
28.                 desiredHeight = hit.distance;
29.                 Debug.Log(hit.transform.name + " " + hit.distance.ToString());
30.             }
31.            
32.  
33.             // get the normalized position of this game object relative to the terrain
34.             Vector3 tempCoord = (transform.position - terr.gameObject.transform.position);
35.             Vector3 coord;
36.             coord.x = tempCoord.x / terr.terrainData.size.x;
37.             coord.y = tempCoord.y / terr.terrainData.size.y;
38.             coord.z = tempCoord.z / terr.terrainData.size.z;
39.             // get the position of the terrain heightmap where this game object is
40.             posXInTerrain = (int) (coord.x * hmWidth);
41.             posZInTerrain = (int) (coord.z * hmHeight);
42.            
43.             // we set an offset so that all the raising terrain is under this game object
44.             int offsetX = (int)transform.localScale.x / 2;
45.             int offsetZ = (int)transform.localScale.z / 2;
46.  
47.            
48.             // get the heights of the terrain under this game object
49.             float[,] heights = terr.terrainData.GetHeights(posXInTerrain-offsetX,posZInTerrain-offsetZ, (int)transform.localScale.x, (int)transform.localScale.z);
50.            
51.             // we set each sample of the terrain in the size to the desired height
52.             for (int i=0; i<(int)transform.localScale.z; i++)
53.                 for (int j=0; j<(int)transform.localScale.x; j++)
54.                     heights[i,j] = desiredHeight;
55.  
56.  
57.            
58.             // set the new height
59.             terr.terrainData.SetHeights(posXInTerrain-offsetX,posZInTerrain-offsetZ,heights);
60.             updated = true;
61.         }
62.     }
63. }
64.  

 

Hey man, I realise it's been a while but did you find a solution? I need the exact same thing and can't find anything simmilar