Auto grass placement not working properly

Hello, I have this script which I found online that allows me to automatically add grass to specific textures on my terrain it works nicely except if I make the detailCountPerDetailPixel to bigger than 1 (I need to make it bigger to make my grass a little more dense) it only creates stripes of grass at certain points of the terrain which obviously isn't the correct behavior so if someone wants to try to take a look at this or redirect me to better and newer solution I'd me thankful.

Code (CSharp):

1. using UnityEngine;
2. using UnityEditor;
3.  
4. public class GrassCreator : EditorWindow
5. {
6.  
7.     public Terrain terrain;
8.     public int detailIndexToMassPlace;
9.     public int[] splatTextureIndicesToAffect = new int[] { 0, };
10.     public int detailCountPerDetailPixel = 1;
11.  
12.     [MenuItem("Tools/Mass Grass Placement")]
13.  
14.     static void Init()
15.     {
16.         GrassCreator window = (GrassCreator)GetWindow(typeof(GrassCreator));
17.         window.Show();
18.         window.titleContent = new GUIContent("Grass Creator");
19.         window.Focus();
20.         window.ShowUtility();
21.         if (Selection.activeGameObject && Selection.activeGameObject.GetComponent<Terrain>())
22.         {
23.             window.terrain = Selection.activeGameObject.GetComponent<Terrain>();
24.         }
25.     }
26.  
27.     void OnGUI()
28.     {
29.         GUILayout.Label("Grass Creator", EditorStyles.boldLabel);
30.         GUILayout.Label("Settings for Grass", EditorStyles.centeredGreyMiniLabel);
31.  
32.         ScriptableObject ter = this;
33.         SerializedObject terrainso = new SerializedObject(ter);
34.         SerializedProperty property = terrainso.FindProperty("terrain");
35.         EditorGUILayout.PropertyField(property, new GUIContent("Terrain Object:", "Place your terrain object in here."), true);
36.         terrainso.ApplyModifiedProperties();
37.  
38.         if (terrain != null)
39.         {
40.             detailCountPerDetailPixel = EditorGUILayout.IntSlider(new GUIContent("Detail Counter Per Detail Pixel:", "The detail count per detail pixel"), detailCountPerDetailPixel, 1, 16);
41.             detailIndexToMassPlace = EditorGUILayout.IntSlider(new GUIContent("Detail Index to Place:", "Select the grass index to mass place"), detailIndexToMassPlace, 0, terrain.terrainData.detailPrototypes.Length - 1);
42.  
43.             ScriptableObject target = this;
44.             SerializedObject so = new SerializedObject(target);
45.             SerializedProperty stringsProperty = so.FindProperty("splatTextureIndicesToAffect");
46.             EditorGUILayout.PropertyField(stringsProperty, new GUIContent("Splat Textures to place on:", "Indicate the splatmap index to place on."), true);
47.             so.ApplyModifiedProperties();
48.  
49.             if (GUILayout.Button(new GUIContent("Mass Place Grass", "Work the magic :D")))
50.             {
51.                 CreateGrass();
52.             }
53.         }
54.     }
55.  
56.     void CreateGrass()
57.     {
58.  
59.         if (!terrain)
60.         {
61.             Debug.LogError("You have not selected a terrain object");
62.             return;
63.         }
64.  
65.         if (detailIndexToMassPlace >= terrain.terrainData.detailPrototypes.Length)
66.         {
67.             Debug.LogError("You have chosen a detail index which is higher than the number of detail prototypes in your detail libary. Indices starts at 0");
68.             return;
69.         }
70.  
71.         if (splatTextureIndicesToAffect.Length > terrain.terrainData.splatPrototypes.Length)
72.         {
73.             Debug.LogError("You have selected more splat textures to paint on, than there are in your libary.");
74.             return;
75.         }
76.  
77.         for (int i = 0; i < splatTextureIndicesToAffect.Length; i++)
78.         {
79.             if (splatTextureIndicesToAffect[i] >= terrain.terrainData.splatPrototypes.Length)
80.             {
81.                 Debug.LogError("You have chosen a splat texture index which is higher than the number of splat prototypes in your splat libary. Indices starts at 0");
82.                 return;
83.             }
84.         }
85.  
86.         if (detailCountPerDetailPixel > 16)
87.         {
88.             Debug.LogError("You have selected a non supported amount of details per detail pixel. Range is 0 to 16");
89.             return;
90.         }
91.  
92.         int alphamapWidth = terrain.terrainData.alphamapWidth;
93.         int alphamapHeight = terrain.terrainData.alphamapHeight;
94.         int detailWidth = terrain.terrainData.detailResolution;
95.         int detailHeight = detailWidth;
96.         float resolutionDiffFactor = (float)alphamapWidth / detailWidth;
97.         float[,,] splatmap = terrain.terrainData.GetAlphamaps(0, 0, alphamapWidth, alphamapHeight);
98.         int[,] newDetailLayer = new int[detailWidth, detailHeight];
99.  
100.         for (int i = 0; i < splatTextureIndicesToAffect.Length; i++)
101.         {
102.  
103.             for (int j = 0; j < detailWidth; j++)
104.             {
105.  
106.                 for (int k = 0; k < detailHeight; k++)
107.                 {
108.                     float alphaValue = splatmap[(int)(resolutionDiffFactor * j), (int)(resolutionDiffFactor * k), splatTextureIndicesToAffect[i]];
109.                     newDetailLayer[j, k] = (int)Mathf.Round(alphaValue * ((float)detailCountPerDetailPixel)) + newDetailLayer[j, k];
110.                 }
111.  
112.             }
113.  
114.         }
115.         terrain.terrainData.SetDetailLayer(0, 0, detailIndexToMassPlace, newDetailLayer);
116.     }
117. }
118.  

 

Anyone? I got little more info, the bigger the detailCountPerDetailPixel gets the smaller the stripes become here are few examples on how the stripes look like.

 

I'm getting the same issue, i can't figure out what is causing it :S

 

Sorry for not answering but I never got a notification. But if you still need help I found a way to fix it you need to decrease "Detail Resolution Per Patch" I set mine to 32 from 128 and also I recommend increasing the "Detail Resolution" I set mine from 1280 to 2048 and after that it worked flawlessly.