How to know the tree's type on terrain I am colliding?

There may be a way to get the closest tree at the location you are standing. But I dont think you can get the colliding tree from the terrain tree collider it self.

I was working on finding tree positions yesterday. So here is a script that will place a normal collider at all tree positions. And then inform a script of the type of tree that is standing there.

treeInstance does not have a name, but you can get the index number of the tree type.

addTreeColliders.js

 #pragma strict
 
 
 /*
 You will need to assign a prefab with the script treeInfo.js and basic trigger collider
 */
 
 var treeColliderPrefab : GameObject;
 
 function Start() {
     
     var pos : Vector3;
     var treeCollider : GameObject;
     
      for (var i=0; i < Terrain.activeTerrain.terrainData.treeInstances.Length; i++){
         pos = Vector3.Scale(Terrain.activeTerrain.terrainData.treeInstances[i].position,Terrain.activeTerrain.terrainData.size)+ Terrain.activeTerrain.transform.position;
         Debug.Log('A tree at world position '+pos+' type: '+ Terrain.activeTerrain.terrainData.treeInstances[i].prototypeIndex);
         
         treeCollider = Instantiate(treeColliderPrefab, pos, Quaternion.identity);
         treeCollider.GetComponent(treeInfo).treeType = Terrain.activeTerrain.terrainData.treeInstances[i].prototypeIndex;
         
         //You might want to parent all colliders to something so they dont clutter the scene
         //treeCollider.transform.parent = //sometransform
      }
  
  } 

 

treeInfo.js

 #pragma strict
 
 var treeType : int; //Couolp be used to lookup a static array of tree types
 
 function OnTriggerEnter(col : Collider){
     Debug.LogError('The tree here is of type '+treeType);    
 }