using nature renderer trying to apply a detail to specific terrain layer, not just whole terrain. Anyone ever do this?
this script is almost working but there is an x and z offset of about 2f x and 1 f z. Tried some other methods trying to scale alphamap resolution to terrain resolution but it failed badly. This is the closest I have come up with
using UnityEngine;
public class GrassRenderer : MonoBehaviour
{
public Terrain terrain;
public int density = 1; // Density for the detail layer.
public int targetTextureLayer = 3; // Target the 4th texture layer (index 3).
public int detailPrototypeIndex = 0; // The detail prototype to paint.
// Define delegates for layer operations
public delegate int GetLayerCount();
public delegate string GetLayerName(int index);
// Delegate instances
public GetLayerCount getLayerCount;
public GetLayerName getLayerName;
private void Start()
{
terrain = GetComponent<Terrain>();
var terrainData = terrain.terrainData;
if (terrainData == null || targetTextureLayer >= terrainData.alphamapLayers)
{
Debug.LogWarning("Invalid terrain or target texture layer index.");
return;
}
// Get detail resolution
int width = terrainData.detailResolution;
int height = terrainData.detailResolution;
// Prepare the detail array
int[,] details = terrainData.GetDetailLayer(0, 0, width, height, detailPrototypeIndex);
// Access the alpha map for the target texture layer
float[,,] alphaMap = terrainData.GetAlphamaps(0, 0, width, height);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
// Paint details only where the target texture layer is present
if (alphaMap[x, y, targetTextureLayer] > 0.5f) // Adjust the threshold as necessary
{
details[x, y] = density;
}
else
{
details[x, y] = 0; // Clear details where the texture layer is not present
}
}
}
// Apply the detail layer
terrainData.SetDetailLayer(0, 0, detailPrototypeIndex, details);
}
}