Trying to get Detailed Mesh Instances from Terrain Data

Questions & Answers
1

Hey All,
I simply trying to get instance of added Detailed Meshes from Terrain Data,
There is already ‘TreeInstance’ in TerrainData but there is no ‘DetailInstance’, so I can’t access grass objects that instantiated in Terrain Tool, my purpose is taking out of all instances to world from terrain data.

2

Hello all, I have found the answer today, I wrote something like this, Hope it helps!

Copy all and paste somewhere

public class DetailedObjectInstance
{
    public GameObject Prefab;
    public Vector3 Position;
    public Vector3 Rotation;
    public Vector3 Scale;

    public static DetailedObjectInstance[] ExportObjects(Terrain terrain)
    {

        List<DetailedObjectInstance> output = new List<DetailedObjectInstance>();

        TerrainData data = terrain.terrainData;
        if (terrain.detailObjectDensity != 0)
        {

            int detailWidth = data.detailWidth;
            int detailHeight = data.detailHeight;


            float delatilWToTerrainW = data.size.x / detailWidth;
            float delatilHToTerrainW = data.size.z / detailHeight;

            Vector3 mapPosition = terrain.transform.position;

            bool doDentisy = false;
            float targetDentisty = 0;
            if (terrain.detailObjectDensity != 1)
            {
                targetDentisty = (1 / (1f - terrain.detailObjectDensity));
                doDentisy = true;
            }


            float currentDentity = 0;

            DetailPrototype[] details = data.detailPrototypes;
            for (int i = 0; i < details.Length; i++)
            {
                GameObject Prefab = details*.prototype;*

float minWidth = details*.minWidth;*
float maxWidth = details*.maxWidth;*

float minHeight = details*.minHeight;*
float maxHeight = details*.maxHeight;*

int[,] map = data.GetDetailLayer(0, 0, data.detailWidth, data.detailHeight, 0);

List grasses = new List();
for (var y = 0; y < data.detailHeight; y++)
{
for (var x = 0; x < data.detailWidth; x++)
{
if (map[x, y] > 0)
{
currentDentity += 1f;

bool pass = false;
if (!doDentisy)
pass = true;
else
pass = currentDentity < targetDentisty;

if (pass)
{
float z = (x * delatilWToTerrainW) + mapPosition.z;
float x = (y * delatilHToTerrainW) + mapPosition.x;
float _y = terrain.SampleHeight(new Vector3(_x, 0, _z));
grasses.Add(new Vector3(
_x,
_y,
_z
));
}
else
{
currentDentity -= targetDentisty;
}

}
}
}

foreach (var item in grasses)
{
DetailedObjectInstance e = new DetailedObjectInstance();
e.Prefab = Prefab;

e.Position = item;
e.Rotation = new Vector3(0, UnityEngine.Random.Range(0, 360), 0);
e.Scale = new Vector3(UnityEngine.Random.Range(minWidth, maxWidth), UnityEngine.Random.Range(minHeight, maxHeight), UnityEngine.Random.Range(minWidth, maxWidth));

output.Add(e);
}
}
}

return output.ToArray();
}
}
**After that its ready to use **
An Example of usage =>
private void Awake()
{
Terrain terrian = GetComponent();

DetailedObjectInstance[] objects = DetailedObjectInstance.ExportObjects(terrian);
foreach (var item in objects)
{
GameObject obj = Instantiate(item.Prefab, item.Position, Quaternion.Euler(item.Rotation));
obj.transform.localScale = item.Scale;
}
}

3

thank you so much. you saved my a big time. you are awesome!