Getting back trees from terrain

Unity Engine
1

Hey guys, I’ve been using a script that allows me to chop down terrain trees and replacing them with falling prefabs. the only problem is, when i chop the tree, on the next run of the application the trees don’t come back. Can someone send me some example, or tell me how I can do that?

Here’s my code for replacing trees with prefabs:

private void Start()
    {
        TreeInstances = new List<TreeInstance>(Terrain.activeTerrain.terrainData.treeInstances);
        Debug.Log("Tree Instances:" + TreeInstances.Count);
    }
    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Debug.Log("Hitted !");
            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            if (Physics.Raycast(ray, out hit, 10.0f))
            {
                if (hit.collider.name != Terrain.activeTerrain.name)
                {
                    return;
                }
?
                float sampleHeight = Terrain.activeTerrain.SampleHeight(hit.point);

                if (hit.point.y <= sampleHeight + 0.01f)
                {
                    return;
                }

                TerrainData terrain = Terrain.activeTerrain.terrainData;
                TreeInstance[] treeInstances = terrain.treeInstances;
                float maxDistance = float.MaxValue;
                Vector3 closestTreePosition = new Vector3();
                int closestTreeIndex = 0;
                for (int i = 0; i < treeInstances.Length; i++)
                {
                    TreeInstance currentTree = treeInstances[i];
                    Vector3 currentTreeWorldPosition = Vector3.Scale(currentTree.position, terrain.size) + Terrain.activeTerrain.transform.position;

                    float distance = Vector3.Distance(currentTreeWorldPosition, hit.point);

                    if (distance < maxDistance)
                    {
                        maxDistance = distance;
                        closestTreeIndex = i;
                        closestTreePosition = currentTreeWorldPosition;
                    }
                }
                TreeInstances.RemoveAt(closestTreeIndex);
                terrain.treeInstances = TreeInstances.ToArray();

                float[,] heights = terrain.GetHeights(0, 0, 0, 0);
                terrain.SetHeights(0, 0, heights);

                Instantiate(FallingTreePrefab, closestTreePosition, Quaternion.identity);
                Debug.Log("Tree was destroyed");
            }
        }
    }
2

terrains are a little weird, but you’re modifying the terrain asset during runtime, so it’s permanent. You’ll need to take a copy of the terrain you want to keep for the current play session if you want to keep the original for another session to use. Google around you should be able to find people working around this: something like

but you’ll want to preserve the tree data too

1 Like
3

Thank you so much, I’ve got it… :slight_smile: