Converting all terrain trees to gameobjects?

Question

I am working on a script which is supposed to convert all of the terrain trees in the scene to gameobjects (I made a billboard script, and I need to have basic scripts on the trees). Now, the problem is that the trees are not in the correct position when instantiated -- I removed the code of destroying the terrain trees, and the trees instantiated are far from where they are supposed to be. Second, the trees do not respond to height. Please help me fix this problem. Thanks!

Code:

 using UnityEngine;
 using UnityEditor;
 using System.Collections;
 using System.Collections.Generic;
 
 [ExecuteInEditMode]
 public class CustomTreeBrush : EditorWindow
 {
 
     Terrain terrain;
 
     GameObject[] trees = new GameObject[4];
 
 
     [MenuItem ("Tools/Custom/Terrain")]
     static void Init()
     {
         CustomTreeBrush window = (CustomTreeBrush)GetWindow (typeof(CustomTreeBrush));
     }
 
     void OnGUI()
     {
         terrain = (Terrain)EditorGUILayout.ObjectField (terrain, typeof(Terrain), true);
 
         trees[0] = (GameObject)EditorGUILayout.ObjectField (trees[0], typeof(GameObject), true);
         trees[1] = (GameObject)EditorGUILayout.ObjectField (trees[1], typeof(GameObject), true);
         trees[2] = (GameObject)EditorGUILayout.ObjectField (trees[2], typeof(GameObject), true);
         trees[3] = (GameObject)EditorGUILayout.ObjectField (trees[3], typeof(GameObject), true);
 
         if(GUILayout.Button("Convert to objects"))
         {
             Convert();
         }
     //    if(GUILayout.Button("Debug"))
     //    {
     //    }
     }
 
     public void Convert()
     {
         TerrainData data = terrain.terrainData;
         float width = (float)data.heightmapWidth;
         float height = (float)data.heightmapHeight;
         foreach(TreeInstance tree in data.treeInstances)
         {
             Vector3 position = new Vector3(tree.position.x * width, tree.position.y, tree.position.z * height);
             Instantiate(trees[tree.prototypeIndex], position, Quaternion.identity);
         }
     }
 
 }

Answer 1

Best Answer

Answer by Murkas · Jun 07, 2014 at 07:12 PM

You are using the width and height of the heightmap, which is basically the resolution of the heightmap. Try using

 public void Convert()
 {
   TerrainData data = terrain.terrainData;
   float width = data.size.x;
   float height = data.size.z;
   float y = data.size.y;
   foreach(TreeInstance tree in data.treeInstances)
   {
     Vector3 position = new Vector3(tree.position.x * width, tree.position.y*y, tree.position.z * height);
     Instantiate(trees[tree.prototypeIndex], position, Quaternion.identity);
   }
 }

instead. TerrainData.size is the actual size of the terrain in world units.

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HuskyPanda213 · Jun 07, 2014 at 08:57 PM 0

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Thank you! This fixed the problems. :)

xxhaissamxx · Jan 22, 2018 at 06:24 AM 0

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can do same for grass ? i tried

 foreach (DetailPrototype grass in data.detailPrototypes)
         {
             Vector3 position = new Vector3(grass.prototype.transform.position.x * width, grass.prototype.transform.position.y * y, grass.prototype.transform.position.z * height);
             Instantiate(trees[0], position, Quaternion.identity);
         }

joeysipos · Apr 17, 2021 at 01:21 AM 0

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I spruced up your code some more. Just hit the checkbox populateTrees in the editor, and will extract all the trees (with correct scale) and place them under whatever gameojbect this attached to.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEditor;
 
 
 
 [ExecuteInEditMode]
 public class TreeExtractor : MonoBehaviour
 {
     public bool populateTrees;
     public Terrain terrain;
     public List<GameObject> trees;
 
     private void Update()
     {
         if (populateTrees == true)
         {
             Convert();
             populateTrees = false;
         }
     }
 
     public void Convert()
     {
         GameObject allTrees = new GameObject("AllTrees"); //All trees will be placed under this gameobject 
         allTrees.transform.parent = transform; //make allTrees a parent of this transform
 
         TerrainData data = terrain.terrainData;
         float width = data.size.x;
         float height = data.size.z;
         float y = data.size.y;
         TreePrototype[] treeProtoypes =  terrain.terrainData.treePrototypes; // get tree prototypes on the terrain
         foreach (TreePrototype treeProtoype in treeProtoypes) //extract the tree prefabs into the Gameobject list
         {
             trees.Add(treeProtoype.prefab.gameObject); 
         }
 
         //place the trees
         foreach (TreeInstance tree in data.treeInstances)
         {
             
             Vector3 position = new Vector3(tree.position.x * width, tree.position.y * y, tree.position.z * height);
             Vector3 scale = new Vector3(tree.widthScale, tree.heightScale, tree.widthScale);
             GameObject treeToBePlaced = trees[tree.prototypeIndex];
             treeToBePlaced.transform.localScale = scale;
             Instantiate(treeToBePlaced, position, Quaternion.identity, allTrees.transform);
         }
     }
 }

Answer 2

I have updated this script. It now takes tree prefabs from Terrain. It also sets position, rotation and scale of generated tree game objects correctly (according to terrain data):

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEditor;
 // Replaces Unity terrain trees with prefab GameObject.
 // http://answers.unity3d.com/questions/723266/converting-all-terrain-trees-to-gameobjects.html
 [ExecuteInEditMode]
 public class TreeReplacerS : EditorWindow {
     [Header("References")]
     public Terrain _terrain;
     //============================================
     [MenuItem("Window/My/TreeReplacer")]
     static void Init()
     {
         TreeReplacerS window = (TreeReplacerS)GetWindow(typeof(TreeReplacerS));
     }
     void OnGUI()
     {
         _terrain = (Terrain)EditorGUILayout.ObjectField(_terrain, typeof(Terrain), true);
         if (GUILayout.Button("Convert to objects"))
         {
             Convert();
         }
         if (GUILayout.Button("Clear generated trees"))
         {
             Clear();
         }
     }
     //============================================
     public void Convert()
     {
         TerrainData data = _terrain.terrainData;
         float width = data.size.x;
         float height = data.size.z;
         float y = data.size.y;
         // Create parent
         GameObject parent = GameObject.Find("TREES_GENERATED");
         if (parent == null)
         {
             parent = new GameObject("TREES_GENERATED");
         }
         // Create trees
         foreach (TreeInstance tree in data.treeInstances)
         {
             if (tree.prototypeIndex>=data.treePrototypes.Length)
                 continue;
             var _tree = data.treePrototypes[tree.prototypeIndex].prefab;
             Vector3 position = new Vector3(
                 tree.position.x * width,
                 tree.position.y*y,
                 tree.position.z * height) + _terrain.transform.position;
             Vector3 scale = new Vector3(tree.widthScale,tree.heightScale,tree.widthScale);
             GameObject go = Instantiate(_tree, position, Quaternion.Euler(0f,Mathf.Rad2Deg*tree.rotation,0f), parent.transform) as GameObject;
             go.transform.localScale  = scale;
         }
     }
     public void Clear()
     {
         DestroyImmediate(GameObject.Find("TREES_GENERATED"));
     }
 }

@anunnaki2016 to use this script you need to save it at Assets/Editor/TreeReplacerS.cs. Now you are able to open this tool with Window/My/TreeReplacer menu item.

Answer 3

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEditor;

 // Replaces Unity terrain trees with prefab GameObject.
 // http://answers.unity3d.com/questions/723266/converting-all-terrain-trees-to-gameobjects.html
 [ExecuteInEditMode]
 public class TreeReplacerS : EditorWindow {

 [Header("Settings")]
 public GameObject _tree;

 [Header("References")]
 public Terrain _terrain;

 //============================================

 [MenuItem("Window/My/TreeReplacer")]
 static void Init()
 {
     TreeReplacerS window = (TreeReplacerS)GetWindow(typeof(TreeReplacerS));
 }

 void OnGUI()
 {
     _terrain = (Terrain)EditorGUILayout.ObjectField(_terrain, typeof(Terrain), true);

     _tree = (GameObject)EditorGUILayout.ObjectField(_tree, typeof(GameObject), true);

     if (GUILayout.Button("Convert to objects"))
     {
         Convert();
     }

     if (GUILayout.Button("Clear generated trees"))
     {
         Clear();
     }
 }

 //============================================

 public void Convert()
 {
     TerrainData data = _terrain.terrainData;
     float width = data.size.x;
     float height = data.size.z;
     float y = data.size.y;

     // Create parent
     GameObject parent = GameObject.Find("TREES_GENERATED");

     if (parent == null)
     {
         parent = new GameObject("TREES_GENERATED");
     }

     // Create trees
     foreach (TreeInstance tree in data.treeInstances)
     {
         //Vector3 position = new Vector3(tree.position.x * width, tree.position.y * y, tree.position.z * height);
         Vector3 position = new Vector3(tree.position.x * data.detailWidth - (data.size.x / 2), tree.position.y * y - (data.size.y / 2), tree.position.z * data.detailHeight - (data.size.z / 2));

         //Instantiate(_trees[tree.prototypeIndex], position, Quaternion.identity, parent.transform);
         Instantiate(_tree, position, Quaternion.identity, parent.transform);
     }
 }

 public void Clear()
 {
     DestroyImmediate(GameObject.Find("TREES_GENERATED"));
 }

 }

Answer 4

Answer by unity_0yHbwFRBfNCNxw · Jun 10, 2021 at 03:00 PM

Thank you for that script @joeysipos its realy usefull for me. Another question to all of you. Is there a way of converting the terrain ground to gameobject? I am a C# & Unity beginner. For any suggestion I would be very happy.

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Converting all terrain trees to gameobjects?

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