前段時間我研究過這個問題，但是沒有解決只好作罷。今天剛好有人又問我這個問題，我得空查了一下還是找到了解決辦法。另外也感謝問我的人，解答問題的同時也是我學習的過程。
運行時更新烘培貼圖分兩種情況
1、場景的物件沒有發生變化（也就是說沒有運行時加載在場景上的Prefab）此時可以直接更換烘培貼圖。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | using UnityEngine; using System.Collections; public class NewBehaviourScript : MonoBehaviour { //烘培烘培貼圖1 public Texture2D greenLightMap; //烘培貼圖2 public Texture2D redLightMap; void OnGUI() { if(GUILayout.Button("green")) { LightmapData data = new LightmapData(); data.lightmapFar = greenLightMap; LightmapSettings.lightmaps = new LightmapData[1]{data}; } if(GUILayout.Button("red")) { LightmapData data = new LightmapData(); data.lightmapFar = redLightMap; LightmapSettings.lightmaps = new LightmapData[1]{data}; } } } |
2.場景的烘培貼圖已經更新，但是有些物件prefab想運行時加載進來。如果直接Instance的話 這個Prefab是沒有烘培信息的。（灰顏色的）
解決這個問題我查到了 一篇大大的文章，它帶了例子大家可以下載下來。 http://forum.unity3d.com/threads/problems-with-instantiating-baked-prefabs.324514/#post-2177524
代碼在這裏，把如下代碼掛在GameObject上。當場景烘培結束後，把他保存成prefab，運行的時候直接加載進來就行了。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 | #if UNITY_EDITOR using UnityEditor; using System.IO; #endif using UnityEngine; using System.Collections.Generic; [DisallowMultipleComponent,ExecuteInEditMode] public class PrefabLightmapData : MonoBehaviour { [System.Serializable] struct RendererInfo { public Renderer renderer; public int lightmapIndex; public Vector4 lightmapOffsetScale; } [SerializeField] RendererInfo[] m_RendererInfo; [SerializeField] Texture2D[] m_Lightmaps; [SerializeField] Texture2D[] m_Lightmaps2; const string LIGHTMAP_RESOURCE_PATH = "Assets/Resources/Lightmaps/"; [System.Serializable] struct Texture2D_Remap { public int originalLightmapIndex; public Texture2D originalLightmap; public Texture2D lightmap0; public Texture2D lightmap1; } static List<Texture2D_Remap> sceneLightmaps = new List<Texture2D_Remap>(); void Awake() { ApplyLightmaps(m_RendererInfo, m_Lightmaps, m_Lightmaps2); } static void ApplyLightmaps(RendererInfo[] rendererInfo, Texture2D[] lightmaps, Texture2D[] lightmaps2) { bool existsAlready = false; int counter = 0; int[] lightmapArrayOffsetIndex; if (rendererInfo == null || rendererInfo.Length == 0) return; var settingslightmaps = LightmapSettings.lightmaps; var combinedLightmaps = new List<LightmapData>(); lightmapArrayOffsetIndex = new int[lightmaps.Length]; for (int i = 0; i < lightmaps.Length; i++) { existsAlready = false; for (int j = 0; j < settingslightmaps.Length; j++) { if (lightmaps[i] == settingslightmaps[j].lightmapFar) { lightmapArrayOffsetIndex[i] = j; existsAlready = true; } } if (!existsAlready) { lightmapArrayOffsetIndex[i] = counter + settingslightmaps.Length; var newLightmapData = new LightmapData(); newLightmapData.lightmapFar = lightmaps[i]; newLightmapData.lightmapNear = lightmaps2[i]; combinedLightmaps.Add(newLightmapData); ++counter; } } var combinedLightmaps2 = new LightmapData[settingslightmaps.Length + counter]; settingslightmaps.CopyTo(combinedLightmaps2, 0); if (counter > 0) { for (int i = 0; i < combinedLightmaps.Count; i++) { combinedLightmaps2[i + settingslightmaps.Length] = new LightmapData(); combinedLightmaps2[i + settingslightmaps.Length].lightmapFar = combinedLightmaps[i].lightmapFar; combinedLightmaps2[i + settingslightmaps.Length].lightmapNear = combinedLightmaps[i].lightmapNear; } } ApplyRendererInfo(rendererInfo, lightmapArrayOffsetIndex); LightmapSettings.lightmaps = combinedLightmaps2; } static void ApplyRendererInfo(RendererInfo[] infos, int[] arrayOffsetIndex) { for (int i = 0; i < infos.Length; i++) { var info = infos[i]; info.renderer.lightmapIndex = arrayOffsetIndex[info.lightmapIndex]; info.renderer.lightmapScaleOffset = info.lightmapOffsetScale; } } #if UNITY_EDITOR [MenuItem("Assets/Update Scene with Prefab Lightmaps")] static void UpdateLightmaps() { PrefabLightmapData[] prefabs = FindObjectsOfType<PrefabLightmapData>(); foreach (var instance in prefabs) { ApplyLightmaps(instance.m_RendererInfo, instance.m_Lightmaps, instance.m_Lightmaps2); } Debug.Log("Prefab lightmaps updated"); } [MenuItem("Assets/Bake Prefab Lightmaps")] static void GenerateLightmapInfo() { Debug.ClearDeveloperConsole(); if (Lightmapping.giWorkflowMode != Lightmapping.GIWorkflowMode.OnDemand) { Debug.LogError("ExtractLightmapData requires that you have baked you lightmaps and Auto mode is disabled."); return; } Lightmapping.Bake(); string lightMapPath = System.IO.Path.Combine(Directory.GetCurrentDirectory(),LIGHTMAP_RESOURCE_PATH); if(!Directory.Exists(lightMapPath)) Directory.CreateDirectory(lightMapPath); sceneLightmaps = new List<Texture2D_Remap>(); //var scene = UnityEngine.SceneManagement.SceneManager.GetActiveScene(); var sceneName =Path.GetFileNameWithoutExtension(EditorApplication.currentScene) ; var resourcePath = LIGHTMAP_RESOURCE_PATH + sceneName; var scenePath = System.IO.Path.GetDirectoryName(EditorApplication.currentScene) + "/" + sceneName + "/"; PrefabLightmapData[] prefabs = FindObjectsOfType<PrefabLightmapData>(); foreach (var instance in prefabs) { var gameObject = instance.gameObject; var rendererInfos = new List<RendererInfo>(); var lightmaps = new List<Texture2D>(); var lightmaps2 = new List<Texture2D>(); GenerateLightmapInfo(scenePath, resourcePath, gameObject, rendererInfos, lightmaps, lightmaps2); instance.m_RendererInfo = rendererInfos.ToArray(); instance.m_Lightmaps = lightmaps.ToArray(); instance.m_Lightmaps2 = lightmaps2.ToArray(); var targetPrefab = PrefabUtility.GetPrefabParent(gameObject) as GameObject; if (targetPrefab != null) { //Prefab PrefabUtility.ReplacePrefab(gameObject, targetPrefab); } ApplyLightmaps(instance.m_RendererInfo, instance.m_Lightmaps, instance.m_Lightmaps2); } Debug.Log("Update to prefab lightmaps finished"); } static void GenerateLightmapInfo(string scenePath, string resourcePath, GameObject root, List<RendererInfo> rendererInfos, List<Texture2D> lightmaps, List<Texture2D> lightmaps2) { var renderers = root.GetComponentsInChildren<MeshRenderer>(); foreach (MeshRenderer renderer in renderers) { if (renderer.lightmapIndex != -1) { RendererInfo info = new RendererInfo(); info.renderer = renderer; info.lightmapOffsetScale = renderer.lightmapScaleOffset; Texture2D lightmap = LightmapSettings.lightmaps[renderer.lightmapIndex].lightmapFar; Texture2D lightmap2 = LightmapSettings.lightmaps[renderer.lightmapIndex].lightmapNear; int sceneLightmapIndex = AddLightmap(scenePath, resourcePath, renderer.lightmapIndex, lightmap, lightmap2); info.lightmapIndex = lightmaps.IndexOf(sceneLightmaps[sceneLightmapIndex].lightmap0); if (info.lightmapIndex == -1) { info.lightmapIndex = lightmaps.Count; lightmaps.Add(sceneLightmaps[sceneLightmapIndex].lightmap0); lightmaps2.Add(sceneLightmaps[sceneLightmapIndex].lightmap1); } rendererInfos.Add(info); } } } static int AddLightmap(string scenePath, string resourcePath, int originalLightmapIndex, Texture2D lightmap, Texture2D lightmap2) { int newIndex = -1; for (int i = 0; i < sceneLightmaps.Count; i++) { if (sceneLightmaps[i].originalLightmapIndex == originalLightmapIndex) { return i; } } if (newIndex == -1) { var lightmap_Remap = new Texture2D_Remap(); lightmap_Remap.originalLightmapIndex = originalLightmapIndex; lightmap_Remap.originalLightmap = lightmap; var filename = scenePath + "Lightmap-" + originalLightmapIndex; lightmap_Remap.lightmap0 = GetLightmapAsset(filename + "_comp_light.exr", resourcePath + "_light", originalLightmapIndex, lightmap); if (lightmap2 != null) { lightmap_Remap.lightmap1 = GetLightmapAsset(filename + "_comp_dir.exr", resourcePath + "_dir", originalLightmapIndex, lightmap2); } sceneLightmaps.Add(lightmap_Remap); newIndex = sceneLightmaps.Count - 1; } return newIndex; } static Texture2D GetLightmapAsset(string filename, string resourcePath, int originalLightmapIndex, Texture2D lightmap) { AssetDatabase.ImportAsset(filename, ImportAssetOptions.ForceUpdate); var importer = AssetImporter.GetAtPath(filename) as TextureImporter; importer.isReadable = true; AssetDatabase.ImportAsset(filename, ImportAssetOptions.ForceUpdate); var assetLightmap = AssetDatabase.LoadAssetAtPath<Texture2D>(filename); var assetPath = resourcePath + "-" + originalLightmapIndex + ".asset"; var newLightmap = Instantiate<Texture2D>(assetLightmap); AssetDatabase.CreateAsset(newLightmap, assetPath); newLightmap = AssetDatabase.LoadAssetAtPath<Texture2D>(assetPath); importer.isReadable = false; AssetDatabase.ImportAsset(filename, ImportAssetOptions.ForceUpdate); return newLightmap; } #endif } |
點擊 Assets/Bake Prefab Lightmaps 進行烘培， 這樣它的腳本里會把index 和 offset保存在prefab裏。它還會保存上當前烘培場景的Lightmap，如果運行時想更換的話，你可以加一些自己的邏輯進行切換。
最後歡迎大家測試，歡迎大家提出寶貴意見，我們一起把unity這個坑填了！
下載： http://pan.baidu.com/s/1kTU9EOB