Batch set lod distances script.

Why I made it:
I made it because I have downloaded some models/prefabs from asset store and distances set on LODGroup were completely unacceptable. Also there were a lot of prefabs so doing it all manually would be a waste of time.


What does it do:
It basically finds all prefabs that make use of LodGroups and set it's distances.

What it does not do:
It will not add additional lod levels or do anything with the renderers.
It only mess around with distances.

How to run:
Personally I got this script in Assets/Editor/EditorExtensions
You run it by menu Tools->BatchSetLodGroups

You select a folder set weights to your liking and click apply. You cannot stop the process, there is no progress bar, and it takes a while sometime.

Additional info:
The script is very simple and not very pretty. I might change some things in the future but don't count on it. Feel free to modify it or post a comment.
Thank you.

THE SOURCE !!!:

Code (CSharp):

1.  
2.  
3. using System;
4. using System.Collections.Generic;
5. using System.IO;
6. using UnityEditor;
7. using UnityEngine;
8.  
9. public class BatchSetLodGroupWindow : EditorWindow{
10.  
11.     bool includeSubdirectories = true;
12.     LODFadeMode fadeMode = LODFadeMode.None;
13.  
14.     float cullRatio = 0.01f;
15.  
16.     public float[] lodWeights = new float[] { 0.6f, 0.3f, 0.1f };
17.  
18.     string path = string.Empty;
19.  
20.     [MenuItem("Tools/BatchSetLodGroups")]
21.     public static void ShowWindow() {
22.         //Show existing window instance. If one doesn't exist, make one.
23.         EditorWindow.GetWindow(typeof(BatchSetLodGroupWindow));
24.     }
25.  
26.     void OnGUI() {
27.  
28.         GUILayout.Label("LODGroup Settings", EditorStyles.boldLabel);
29.  
30.         EditorGUILayout.BeginHorizontal();
31.         EditorGUILayout.PrefixLabel("Select Directory");
32.         if (GUILayout.Button("Browse")) {
33.             path = EditorUtility.OpenFolderPanel("Select Directory", "", "");
34.         }
35.         EditorGUILayout.EndHorizontal();
36.  
37.         EditorGUILayout.BeginHorizontal();
38.         EditorGUILayout.PrefixLabel("Current Path");
39.         EditorGUILayout.LabelField(path);
40.         EditorGUILayout.EndHorizontal();
41.  
42.         includeSubdirectories = EditorGUILayout.Toggle("Include Subdirectories", includeSubdirectories);
43.  
44.         EditorGUILayout.BeginHorizontal();
45.         EditorGUILayout.PrefixLabel("Fade Mode");
46.         fadeMode = (LODFadeMode)EditorGUILayout.EnumPopup((Enum)fadeMode);
47.         EditorGUILayout.EndHorizontal();
48.  
49.         EditorGUILayout.BeginHorizontal();
50.         EditorGUILayout.PrefixLabel("Cull Ratio (0.01 = 1%)");
51.         cullRatio = EditorGUILayout.FloatField(cullRatio);
52.         EditorGUILayout.EndHorizontal();
53.  
54.         EditorGUILayout.LabelField("LOD Level Weights (will be normalized to 1)");
55.  
56.         ScriptableObject target = this;
57.         SerializedObject so = new SerializedObject(target);
58.         SerializedProperty prop = so.FindProperty(nameof(lodWeights));
59.         EditorGUILayout.PropertyField(prop, true); // True means show children
60.         so.ApplyModifiedProperties(); // Remember to apply modified properties
61.  
62.         if (GUILayout.Button("Apply")) {
63.             if (!string.IsNullOrWhiteSpace(path)) {
64.  
65.                 PerformActionOnPrefab(path, this.includeSubdirectories, GetSetLoadGroup(fadeMode,cullRatio, this.lodWeights));
66.             }
67.         }
68.  
69.         Func<GameObject, bool> GetSetLoadGroup(LODFadeMode fadeMode,float cullRatio, float[] lodWeights) {
70.             return x => SetLodGroupInner(x, fadeMode,cullRatio, lodWeights);
71.         }
72.  
73.         bool SetLodGroupInner(GameObject prefab, LODFadeMode fadeMode,float cullRatio, float[] lodWeights) {
74.  
75.             if (lodWeights == null || lodWeights.Length == 0) return false;
76.             LODGroup[] lodGroups = prefab.GetComponentsInChildren<LODGroup>(true);
77.  
78.             if (lodGroups == null || lodGroups.Length <= 0) {
79.                 return false;
80.             }
81.  
82.             for (int i = 0; i < lodGroups.Length; i++) {
83.                 LODGroup lodGroup = lodGroups[i];
84.  
85.                 lodGroup.fadeMode = fadeMode;
86.                 LOD[] lods = lodGroup.GetLODs();
87.  
88.                 float weightSum = 0;
89.                 for (int k = 0; k < lods.Length; k++) {
90.  
91.                     if (k >= lodWeights.Length) {
92.                         weightSum += lodWeights[lodWeights.Length - 1];
93.                     } else {
94.                         weightSum += lodWeights[k];
95.                     }
96.                 }
97.  
98.  
99.                 float maxLength = 1 - cullRatio;
100.                 float curLodPos = 1;
101.                 for (int j = 0; j < lods.Length; j++) {
102.  
103.                     float weight = j < lodWeights.Length ? lodWeights[j] : lodWeights[lodWeights.Length - 1];
104.  
105.                     float lengthRatio = weightSum != 0 ? weight / weightSum : 1;
106.  
107.                     float lodLength = maxLength * lengthRatio;
108.                     curLodPos = curLodPos - lodLength;
109.  
110.                     lods[j].screenRelativeTransitionHeight = curLodPos;
111.                 }
112.  
113.  
114.                 lodGroup.SetLODs(lods);
115.             }
116.  
117.             return true;
118.         }
119.     }
120.  
121.    
122.     //action: input prefab output should save to prefab
123.     void  PerformActionOnPrefab(string path, bool includeSubdirectories,Func<GameObject,bool> action) {
124.         string[] files = Directory.GetFiles(path,"*.prefab", includeSubdirectories ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly);
125.  
126.         foreach (var file in files) {
127.             GameObject prefabGO = PrefabUtility.LoadPrefabContents(file);
128.  
129.             if (prefabGO != null) {
130.                 action(prefabGO);
131.  
132.                 PrefabUtility.SaveAsPrefabAsset(prefabGO, file);
133.                 PrefabUtility.UnloadPrefabContents(prefabGO);
134.             }
135.         }
136.  
137.     }
138.  
139. }
140.  
141.  

 

Thx! But in 2019.4 have compile errors:

Assets\Editor\BatchSetLodGroupWindow.cs(83,40): error CS0103: The name 'ObjectUtils' does not exist in the current context

Assets\Editor\BatchSetLodGroupWindow.cs(103,49): error CS1061: 'float[]' does not contain a definition for 'Last' and no accessible extension method 'Last' accepting a first argument of type 'float[]' could be found

Assets\Editor\BatchSetLodGroupWindow.cs(117,87): error CS1061: 'float[]' does not contain a definition for 'Last' and no accessible extension method 'Last' accepting a first argument of type 'float[]' could be found

 

Thank you for your input. I have repaired the script should be compiling now.

Next time please quote or send a private message, I don't usually check my old messages.