问题描述
NullReferenceException: Object reference not set to an instance of an object
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Rendering.PostProcessing.AmbientOcclusion.IsEnabledAndSupported (UnityEngine.Rendering.PostProcessing.PostProcessRenderContext context) (at Library/PackageCache/com.unity.postprocessing@2.1.3/PostProcessing/Runtime/Effects/AmbientOcclusion.cs:179)
UnityEngine.Rendering.PostProcessing.PostProcessLayer.SetLegacyCameraFlags (UnityEngine.Rendering.PostProcessing.PostProcessRenderContext context) (at Library/PackageCache/com.unity.postprocessing@2.1.3/PostProcessing/Runtime/PostProcessLayer.cs:696)
UnityEngine.Rendering.PostProcessing.PostProcessLayer.SetupContext (UnityEngine.Rendering.PostProcessing.PostProcessRenderContext context) (at Library/PackageCache/com.unity.postprocessing@2.1.3/PostProcessing/Runtime/PostProcessLayer.cs:781)
UnityEngine.Rendering.PostProcessing.PostProcessLayer.BuildCommandBuffers () (at Library/PackageCache/com.unity.postprocessing@2.1.3/PostProcessing/Runtime/PostProcessLayer.cs:468)
UnityEngine.Rendering.PostProcessing.PostProcessLayer.OnPreCull () (at Library/PackageCache/com.unity.postprocessing@2.1.3/PostProcessing/Runtime/PostProcessLayer.cs:402)问题分析
导入新场景到工程里时报空引用异常，是因为PostProcess版本变化，导致PostProcessLayer组件丢失PostProcessResources引用资源。
解决办法
PostProcessLayer组件执行Reset，然后重新指定Layer就可以了。
或者删除旧组件，重新添加PostProcessLayer也能解决问题。
unity论坛上有个用代码调用Init的也是同样的道理：初始化PostProcessResources
论坛地址：Post Process Stack NullRefferenceException - Unity Forum
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