Find height of mountain in terain?

Question

I'm working at Unity 5.0, and now I random Items above my terrain. But I have a problem, I cannot get Height of mountain in terrain.

 pos.y = Terrain.activeTerrain.SampleHeight(transform.position) + 5;

this code just get constant height of terrain. And my Item cannot appear on my terrain where have mountain! and somewhere it have haft inside mountain!

Answer 1

SampleHeight samples the height of the terrain data, but it does not take into account offset if you have the terrain at any Y than 0. You have to account for this yourself.

It may be that your Terrain has a parent game object that is offset.

Make sure the terrain and anyof its parents are not rotated or scaled.

Then this code should work:

 using UnityEngine;
 
 public class FollowTerrainContour : MonoBehaviour
 {
     void Update()
     {
         float terrainSampleWorld = GetHeight(transform.position);
         UpdateY(terrainSampleWorld);
     }
 
     void UpdateY(float terrainSampleWorld)
     {
         Vector3 pos = transform.position;
         pos.y = terrainSampleWorld;
         transform.position = pos;
     }
 
     float GetHeight(Vector3 position)
     {
         float terrainWorldY = Terrain.activeTerrain.transform.position.y;
         float terrainSampleLocal = Terrain.activeTerrain.SampleHeight(position);
         float terrainSampleWorld = terrainWorldY + terrainSampleLocal;
         return terrainSampleWorld;
     }
 }

Or less verbose:

 height = Terrain.activeTerrain.SampleHeight(position) 
        + Terrain.activeTerrain.transform.position.y;

Answer 2

Answer by PictonicStudio · Oct 23, 2015 at 06:55 AM

Have you tried casting a ray down towards the position you want to query? You could then find the height by using Vector3.DIstance.

 Vector3.Distance(hit.transform.position,new Vector3(hit.transform.positon.x,seaLevel,hit.transform.position.z));

hit being the RayCastHit variable, and seaLevel being the base height you want to measure the height from.

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Phuc Vo · Oct 23, 2015 at 08:24 AM 0

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Sorry, can you tell me more detail about that. I'm create new hit object and I think seaLevel is $$anonymous$$ of terrain height. But my Code is not work and I don't know how hit work.

 RaycastHit hit = new RaycastHit();
 pos.y = Terrain.activeTerrain.SampleHeight(transform.position) + 5;
 Vector3.Distance(hit.transform.position, new Vector3(pos.x, pos.y, hit.transform.position.z));

Find height of mountain in terain?

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