[SOLVED] How to modify a Terrain at runtime and get back to original Terrain on exit?

Hello,

I'm trying to rotate a terrain in runtime, then I want the terrain to get back to its original rotation when I quit the app.

I have basically this algorithm:

- Copy ("clone") the Terrain Data
- Rotate that copy
- When quitting, the copy is automatically destroyed, so the terrain should get back to its original data.

The following code implements this algorithm:

Code (CSharp):

1.  using UnityEngine;
2. public class RotateTerrain : MonoBehaviour
3. {
4.      [SerializeField]
5.      private Terrain terrain;
6.      void Start()
7.      {
8.          WorkOnNewCopy();
9.          // Now we can safely modify our terrain... Can we?
10.          TerrainRotate(terrain, degrees: 90);
11.      }
12.      void WorkOnNewCopy()
13.      {
14.          TerrainData backup_terrainData = terrain.terrainData;
15.          backup_terrainData.name = terrain.terrainData.name + "_tmp";
16.          backup_terrainData = Instantiate(backup_terrainData);
17.          terrain.terrainData = backup_terrainData;
18.          terrain.GetComponent<TerrainCollider>().terrainData = backup_terrainData;
19.          terrain.Flush();
20.      }
21.      void TerrainRotate(Terrain terrain, float degrees)
22.      {
23.          // Super-secret code
24.      }
25. }

It's almost working: when I quit the app (or editor), I find myself with a weird mix between the original terrain, and the modified terrain. Everything seems to be back, except the ground texture (splat map). I feel close to the solution!

Have you got an idea? Thanks in advance!
(same thread as: http://answers.unity3d.com/questions/1391471/how-to-modify-a-terrain-at-runtime-and-get-back-to.html)

 

I used this awesome script to safely clone my terrain: https://gist.github.com/Eldoir/d5a438dfedee55552915b55097dda1d4
Just had to write this:

Code (CSharp):

1. terrain.terrainData = TerrainDataCloner.Clone(terrain.terrainData);
2. terrain.GetComponent<TerrainCollider>().terrainData = terrain.terrainData; // Don't forget to update the TerrainCollider as well

After this, the rotation works perfectly, and it reverts back automatically when I quit.
Just what I wanted!

 

Yes that helper class is key for any true deep-copy of a terrain. Only correct and updated solution i've found.