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Unity中动态切换光照贴图LightProbe的方法

article 2025/3/4 6:25:57

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；


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