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Unity中动态切换光照贴图LightProbe的方法

news 来源：原创 2025/9/8 15:24:14

关键代码：LightmapSettings.lightmaps = lightmapDatas;

LightmapData中操作三张图：lightmapColor,lightmapDir,以及一张ShadowMap

这里只操作前两张：

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;public class LightingSwitchBtn : MonoBehaviour
{public bool IsTurnOn = false;// / 光照信息LightmapData[] lightmapDatas;/// 暗的时候的贴图public Texture2D[] lightmapDark;public Texture2D[] lightmapDarkDir;/// 亮的时候的贴图public Texture2D[] lightmapLight;public Texture2D[] lightmapLightDir;void Awake(){}public void OnPointerClick(){Debug.Log("1111");SwichState();}public void SwichState(){Debug.Log("2222");bool ClickState = !IsTurnOn;if (ClickState){SetLightMap(lightmapLight, lightmapLightDir);}else{SetLightMap(lightmapDark, lightmapDarkDir);}IsTurnOn = ClickState;}public void SetLightMap(Texture2D[] lightmapTex, Texture2D[] lightmapDir){if (lightmapTex == null){return;}lightmapDatas = new LightmapData[lightmapTex.Length];for (int i = 0; i < lightmapTex.Length; i++){LightmapData lmd = new LightmapData();lmd.lightmapColor = lightmapTex[i];lmd.lightmapDir = lightmapDir[i];lightmapDatas[i] = lmd;}LightmapSettings.lightmaps = lightmapDatas;}}

更新光照贴图后，还需要更新天空球，这里以HDRP管线为例，URP和build in同理：

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Rendering;
using UnityEngine.Rendering.HighDefinition;
using UnityEngine.UI;public class LightingSwitchBtn : MonoBehaviour
{public bool IsTurnOn = false;LightmapData[] lightmapDatas;   /// 光照信息[Header("上午")] /// 亮的时候的贴图public Texture2D[] lightmapLightDir;public Texture2D[] lightmapLight;[Header("下午")]  /// 暗的时候的贴图public Texture2D[] lightmapDarkDir;public Texture2D[] lightmapDark;[Header("晚上")]/// 晚上的贴图public Texture2D[] lightmapNightDir;public Texture2D[] lightmapNight;[Header("天空")]public Texture SkyAM;public Texture SkyPM;public Texture SkyNight;[Header("Volume组件")]public Volume myVolume;public Texture mySkyTex;private HDRISky hdriSky;[Range(0,1)]public float TimeSwitch = 0;#region BoolIsTurnOn// public void SwichState()// {//     Debug.Log("啊啊啊");//     bool ClickState = !IsTurnOn;//     if (ClickState)//     {//         SetLightMap(lightmapLight, lightmapLightDir);//     }//     else//     {//         SetLightMap(lightmapDark, lightmapDarkDir);//     }//     IsTurnOn = ClickState;// }#endregion//天空切换void Awake(){VolumeProfile volumeProfile = myVolume.profile;volumeProfile.TryGet<HDRISky>(out hdriSky);mySkyTex = hdriSky.hdriSky.value;}//光照贴图切换public void AM_Time(){Debug.Log("AM");SetLightMap(lightmapLight, lightmapLightDir);hdriSky.hdriSky.value = SkyAM;}public void PM_Time(){Debug.Log("PM");SetLightMap(lightmapDark, lightmapDarkDir);hdriSky.hdriSky.value = SkyPM;}public void Night_Time(){Debug.Log("Night");SetLightMap(lightmapNight, lightmapNightDir);hdriSky.hdriSky.value = SkyNight;}public void SetLightMap(Texture2D[] lightmapTex, Texture2D[] lightmapDir){if (lightmapTex == null){return;}lightmapDatas = new LightmapData[lightmapTex.Length];for (int i = 0; i < lightmapTex.Length; i++){LightmapData lmd = new LightmapData();lmd.lightmapColor = lightmapTex[i];lmd.lightmapDir = lightmapDir[i];lightmapDatas[i] = lmd;}LightmapSettings.lightmaps = lightmapDatas;}}

以上是光照贴图部分的切换，但是这样会有个问题，就是光照贴图并不会影响到新加入的模型的漫反射，因为三个时段的漫反射是由冷到暖的颜色上的变化，如果你没有更新LightProbe的信息，那么你加入的模型必定会是很突兀的，如下图所示：

很明显新加入的沙发并没有暖色调影响到它，那是因为缺少LightProbe的更新，那么如果我们想更新三个时段的LightProbe，就需要将三个时段的的LightProbe保存为Asset，然后去动态加载它；

以下是将LightProbe保存为Asset的资源脚本：

using UnityEditor;
using UnityEngine;public class LightProbeAssetCreator : EditorWindow
{[MenuItem("Assets/Create/Light Probe Asset")]static void CreateLightProbeAsset(){// 获取当前场景中的光照探针数据LightProbes lightProbes = LightmapSettings.lightProbes;// 确保光照探针对象存在if (lightProbes != null){// 创建一个新的实例并将其保存为资产LightProbes lightProbesCopy = Instantiate(lightProbes);// 将实例化的光照探针保存为新资产AssetDatabase.CreateAsset(lightProbesCopy, "Assets/Arts/Scence/LightProbe/lightProbe.asset");// 刷新 AssetDatabase，以确保资产立即出现在项目视图中AssetDatabase.SaveAssets();AssetDatabase.Refresh();// 输出成功消息Debug.Log("Light Probe Asset created at Assets/lightProbe.asset");}else{Debug.LogError("No Light Probes found in LightmapSettings.");}}
}

动态加载LightProbe资产的脚本：

//using EH;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.HighDefinition;
using System.Collections.Generic;
using UnityEditor;public class LightingSwitchBtn : MonoBehaviour
{LightmapData[] lightmapDatas;   /// 光照信息[Header("上午")] /// 亮的时候的贴图public Texture2D[] lightmapLightDir;public Texture2D[] lightmapLight;[Header("下午")]  /// 暗的时候的贴图public Texture2D[] lightmapDarkDir;public Texture2D[] lightmapDark;[Header("晚上")]/// 晚上的贴图public Texture2D[] lightmapNightDir;public Texture2D[] lightmapNight;[Header("天空")]public Texture SkyAM;public Texture SkyPM;public Texture SkyNight;[Header("Volume组件")]public Volume myVolume;public Texture mySkyTex;private HDRISky hdriSky;[Header("直线光")]public Light RealLight;public float Temperature_AM = 5800;public float Intensity_AM = 10;[Space(10)]public float Temperature_PM = 5200;public float Intensity_PM = 20;[Space(10)]public float Temperature_Night = 7500;public float Intensity_Night = 10;[Header("RenderTex")]public RenderTexture RTX01;public RenderTexture RTX02;public Material myMat;[Range(0,1)]public float TimeSwitch = 0;[Header("漫反射(Light Probes Group)")]public LightProbes loadedLightProbes;public string assetPath_AM = "Assets/Arts/Scence/LightProbe/lightProbe_AM.asset";public string assetPath_PM = "Assets/Arts/Scence/LightProbe/lightProbe_PM.asset";public string assetPath_Night = "Assets/Arts/Scence/LightProbe/lightProbe_Night.asset";//天空切换void Awake(){//FW.Get<EffectMgr>().lightControl = this;VolumeProfile volumeProfile = myVolume.profile;volumeProfile.TryGet<HDRISky>(out hdriSky);mySkyTex = hdriSky.hdriSky.value;}//光照贴图切换public void AM_Time(){Debug.Log("AM");SetLightMap(lightmapLight, lightmapLightDir);hdriSky.hdriSky.value = SkyAM;LightDirCol(Temperature_AM,Intensity_AM);LoadLightProbe( assetPath_AM);}public void PM_Time(){Debug.Log("PM");SetLightMap(lightmapDark, lightmapDarkDir);hdriSky.hdriSky.value = SkyPM;LightDirCol(Temperature_PM,Intensity_PM);LoadLightProbe( assetPath_PM);}public void Night_Time(){Debug.Log("Night");SetLightMap(lightmapNight, lightmapNightDir);hdriSky.hdriSky.value = SkyNight;LightDirCol(Temperature_Night,Intensity_Night);LoadLightProbe( assetPath_Night);}public void SetLightMap(Texture2D[] lightmapTex, Texture2D[] lightmapDir){if (lightmapTex == null){return;}lightmapDatas = new LightmapData[lightmapTex.Length];for (int i = 0; i < lightmapTex.Length; i++){LightmapData lmd = new LightmapData();lmd.lightmapColor = lightmapTex[i];lmd.lightmapDir = lightmapDir[i];lightmapDatas[i] = lmd;}LightmapSettings.lightmaps = lightmapDatas;}public void LightDirCol( float TemperatureTime , float IntensityTime){RealLight.colorTemperature = TemperatureTime;HDAdditionalLightData hdLight = RealLight.GetComponent<HDAdditionalLightData>();hdLight.intensity = IntensityTime;Debug.Log("光照强度" + RealLight.intensity);}void Update(){if (Input.GetKeyDown(KeyCode.Q)){LightDirCol(Temperature_AM,Intensity_AM);}else if (Input.GetKeyDown(KeyCode.E)){LightDirCol(Temperature_PM,Intensity_PM);}else if(Input.GetKeyDown(KeyCode.R)){LightDirCol(Temperature_Night,Intensity_Night);}}void LoadLightProbe( string assetPath){// 加载光照探针资产loadedLightProbes = AssetDatabase.LoadAssetAtPath<LightProbes>(assetPath);if (loadedLightProbes != null){LightmapSettings.lightProbes = loadedLightProbes;}else{Debug.LogError("光照探针毛都没 " + assetPath);}}
}

其中LightProbes的加载关键代码是：

    void LoadLightProbe( string assetPath){// 加载光照探针资产loadedLightProbes = AssetDatabase.LoadAssetAtPath<LightProbes>(assetPath);if (loadedLightProbes != null){LightmapSettings.lightProbes = loadedLightProbes;}else{Debug.LogError("光照探针毛都没 " + assetPath);}}

完整脚本有冗余，请自行删减；

Unity中动态切换光照贴图&&LightProbe的方法

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