untiy 为预制体动态加载光照贴图-编程知识

unity版本为2021.8
预制体不能携带光照贴图信息，只能我们自己准备了
多方查找加自己摸索终于找到了适合新版本的解决方案，直接贴代码

将这个脚本挂到预制体的最上级

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;[System.Serializable]
public struct RendererInfo
{public Renderer renderer;//网格物体  网格和地形的光照信息是分开的public Terrain terrain;//地形public int lightmapIndex;public Vector4 lightmapScaleScaleOffset;
}
//记录光照贴图的信息
public class PrefabLightmapData : MonoBehaviour
{public RendererInfo[] m_RendererInfo;public Texture2D[] m_Lightmaps_light;//颜色贴图public Texture2D[] m_Lightmaps_dir;//方向贴图public Texture2D[] m_Lightmaps_shadowmask;//阴影贴图private void Awake() {RebuildLight();}public void RebuildLight(){if (m_RendererInfo == null || m_RendererInfo.Length == 0) return;LightmapData[] lightmapDataArray = new LightmapData[m_Lightmaps_light.Length];for (int i = 0; i < m_Lightmaps_light.Length; i++){LightmapData lightmapData = new LightmapData();if (i < m_Lightmaps_light.Length) lightmapData.lightmapColor = m_Lightmaps_light[i];if (i < m_Lightmaps_dir.Length) lightmapData.lightmapDir = m_Lightmaps_dir[i];if (i < m_Lightmaps_shadowmask.Length) lightmapData.shadowMask = m_Lightmaps_shadowmask[i];lightmapDataArray[i] = lightmapData;}//为预制体的物体应用光照贴图ApplyRendererInfo(m_RendererInfo);LightmapSettings.lightmaps = lightmapDataArray;//将光照贴图应用到Untiy}//应用光照贴图信息到重建的预制体private void ApplyRendererInfo(RendererInfo[] rendererInfoArray){for (int i = 0; i < rendererInfoArray.Length; i++){RendererInfo rendererInfo = rendererInfoArray[i];if (rendererInfo.renderer != null){rendererInfo.renderer.lightmapIndex = rendererInfo.lightmapIndex;rendererInfo.renderer.lightmapScaleOffset = rendererInfo.lightmapScaleScaleOffset;}else if (rendererInfo.terrain != null){rendererInfo.terrain.lightmapIndex = rendererInfo.lightmapIndex;rendererInfo.terrain.lightmapScaleOffset = rendererInfo.lightmapScaleScaleOffset;}}}
}
//自定义inspector面板
[CustomEditor(typeof(PrefabLightmapData))]
public class PrefabLightmapData_Inspector : Editor
{//重写OnInspectorGUI类(刷新Inspector面板)public override void OnInspectorGUI(){//继承基类方法base.OnInspectorGUI();PrefabLightmapData myScript = (PrefabLightmapData)target;//绘制ButtonRect rect = new Rect(0, 0,100,50);if (GUILayout.Button("重新构建烘焙光照")){myScript.RebuildLight();}}
}

在使用下方的脚本完成烘焙后，脚本将自动记录所有模型和地形的烘焙信息，并在运行后自动重建光照贴图，如果我们需要在不运行时查看光照贴图效果，可以手动点击“重新构建烘焙光照”的按钮
在这里插入图片描述

重写烘焙，烘焙完成后自动准备重建光照贴图所需要的信息

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public static class BackeLightMap
{[UnityEditor.MenuItem("Tools/光照/烘焙光照贴图")]private static void GenerateLightmapInfo(){//必须不能是自动烘焙if (UnityEditor.Lightmapping.giWorkflowMode != UnityEditor.Lightmapping.GIWorkflowMode.OnDemand){Debug.LogError("ExtractLightmapData requires that you have baked you lightmaps and Auto mode is disabled.");return;}//烘焙贴图UnityEditor.Lightmapping.Bake();//找到有这个脚本的物体PrefabLightmapData[] prefabs = Object.FindObjectsOfType<PrefabLightmapData>();foreach (var prefabInScene in prefabs){GameObject scenePrefab = prefabInScene.gameObject;List<RendererInfo> rendererInfos = new List<RendererInfo>();//重建光照贴图时需要的信息List<Texture2D> lightmaps_light = new List<Texture2D>();//所有的光照贴图List<Texture2D> lightmaps_dir = new List<Texture2D>();//所有的光照贴图List<Texture2D> lightmaps_shadowmask = new List<Texture2D>();//所有的光照贴图GenerateLightmapInfo(scenePrefab, rendererInfos, lightmaps_light, lightmaps_dir, lightmaps_shadowmask);//获取当前物体的光照贴图信息和光照贴图//为光照贴图信息和光照贴图赋值prefabInScene.m_RendererInfo = rendererInfos.ToArray();prefabInScene.m_Lightmaps_light = lightmaps_light.ToArray();prefabInScene.m_Lightmaps_dir = lightmaps_dir.ToArray();prefabInScene.m_Lightmaps_shadowmask = lightmaps_shadowmask.ToArray();//替换掉已经保存的预制体GameObject sourcePrefab = UnityEditor.PrefabUtility.GetPrefabParent(prefabInScene) as GameObject;//GameObject sourcePrefab = UnityEditor.PrefabUtility.GetCorrespondingObjectFromSource(scenePrefab);if (sourcePrefab != null){UnityEditor.PrefabUtility.ReplacePrefab(scenePrefab, sourcePrefab);}}}//点击按钮生成光照贴图信息private static void GenerateLightmapInfo(GameObject root, List<RendererInfo> rendererInfoList, List<Texture2D> lightmaps_light, List<Texture2D> lightmaps_dir, List<Texture2D> lightmaps_shadowmask){//找到这个物体的所有网格MeshRenderer[] renderers = root.GetComponentsInChildren<MeshRenderer>();//遍历网格foreach (MeshRenderer meshRenderer in renderers){if (meshRenderer.lightmapIndex != -1){//收集光照贴图信息RendererInfo rendererInfo = new RendererInfo();rendererInfo.renderer = meshRenderer;rendererInfo.lightmapIndex = meshRenderer.lightmapIndex;rendererInfo.lightmapScaleScaleOffset = meshRenderer.lightmapScaleOffset;//收集光照贴图//颜色贴图Texture2D lightmap_light = LightmapSettings.lightmaps[meshRenderer.lightmapIndex].lightmapColor;AddLightMapToCheach(lightmaps_light, lightmap_light);//方向贴图Texture2D lightmap_dir = LightmapSettings.lightmaps[meshRenderer.lightmapIndex].lightmapDir;AddLightMapToCheach(lightmaps_dir, lightmap_dir);//shadowmaskTexture2D lightmap_shadowmask = LightmapSettings.lightmaps[meshRenderer.lightmapIndex].shadowMask;AddLightMapToCheach(lightmaps_shadowmask,lightmap_shadowmask);//光照信息rendererInfoList.Add(rendererInfo);}}//找到这个物体的所有网格Terrain[] terrains = root.GetComponentsInChildren<Terrain>();//遍历网格foreach (Terrain terrain in terrains){if (terrain.lightmapIndex != -1){//收集光照贴图信息RendererInfo rendererInfo = new RendererInfo();rendererInfo.terrain = terrain;rendererInfo.lightmapIndex = terrain.lightmapIndex;rendererInfo.lightmapScaleScaleOffset = terrain.lightmapScaleOffset;//收集光照贴图//颜色贴图Texture2D lightmap_light = LightmapSettings.lightmaps[terrain.lightmapIndex].lightmapColor;AddLightMapToCheach(lightmaps_light, lightmap_light);//方向贴图Texture2D lightmap_dir = LightmapSettings.lightmaps[terrain.lightmapIndex].lightmapDir;AddLightMapToCheach(lightmaps_dir, lightmap_dir);//shadowmaskTexture2D lightmap_shadowmask = LightmapSettings.lightmaps[terrain.lightmapIndex].shadowMask;AddLightMapToCheach(lightmaps_shadowmask, lightmap_shadowmask);//光照信息rendererInfoList.Add(rendererInfo);}}}//将一个光照贴图添加进缓存private static void AddLightMapToCheach(List<Texture2D> list,Texture2D texture){if (texture == null) return;int index = list.IndexOf(texture);//查找已有的集合里有没有这个元素，如果没有，返回-1if (index == -1){list.Add(texture);}}
}