Unreal Engine Issues and Bug Tracker (UE-25623)

Description

This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below.

Error message:

Assertion failed: IsValidRef(GBufferResourcesUniformBuffer) [Link Removed] [Line: 406]

Source Context:

  393       
  394       	/** Get the current translucent ambient lighting volume texture. Can vary depending on whether volume filtering is enabled */
  395       	IPooledRenderTarget* GetTranslucencyVolumeAmbient(ETranslucencyVolumeCascade Cascade) { return TranslucencyLightingVolumeAmbient[SelectTranslucencyVolumeTarget(Cascade)].GetReference(); }
  396       
  397       	/** Get the current translucent directional lighting volume texture. Can vary depending on whether volume filtering is enabled */
  398       	IPooledRenderTarget* GetTranslucencyVolumeDirectional(ETranslucencyVolumeCascade Cascade) { return TranslucencyLightingVolumeDirectional[SelectTranslucencyVolumeTarget(Cascade)].GetReference(); }
  399       
  400       	// ---
  401       	/** Get the uniform buffer containing GBuffer resources. */
  402       	FUniformBufferRHIParamRef GetGBufferResourcesUniformBuffer() const 
  403       	{ 
  404       		// if this triggers you need to make sure the GBuffer is not getting released before (using AdjustGBufferRefCount(1) and AdjustGBufferRefCount(-1))
  405       		check(IsValidRef(GBufferResourcesUniformBuffer));
  406       
  407 ***** 		return GBufferResourcesUniformBuffer; 
  408       	}
  409       	/** */
  410       	FIntPoint GetBufferSizeXY() const { return BufferSize; }
  411       	/** */
  412       	uint32 GetSmallColorDepthDownsampleFactor() const { return SmallColorDepthDownsampleFactor; }
  413       	/** Returns an index in the range [0, NumCubeShadowDepthSurfaces) given an input resolution. */
  414       	int32 GetCubeShadowDepthZIndex(int32 ShadowResolution) const;
  415       	/** Returns the appropriate resolution for a given cube shadow index. */
  416       	int32 GetCubeShadowDepthZResolution(int32 ShadowIndex) const;
  417       	/** Returns the size of the shadow depth buffer, taking into account platform limitations and game specific resolution limits. */
  418       	FIntPoint GetShadowDepthTextureResolution() const;
  419       	// @return >= 1x1 <= GMaxShadowDepthBufferSizeX x GMaxShadowDepthBufferSizeY
  420       	FIntPoint GetPreShadowCacheTextureResolution() const;
  421       	FIntPoint GetTranslucentShadowDepthTextureResolution() const;
  422       	int32 GetTranslucentShadowDownsampleFactor() const { return 2; }

Most recent user affected CL: 2818068

Logs: [Link Removed]
[Link Removed]
[Link Removed]

CrashReporter User Descriptions:

Baking Light and Textures
I tried to build lighting on empty level with only one cube that has material set to BasicColor.
When I do the same with some other material, everthing works OK and UE Editor doesn't crash.
I tried to rebuild lighting on empty level with one cube and two directional light
Crashing every time after trying to rebuild lighting
Building the light

Steps to Reproduce

Open UE4 Editor
Create new Material
With final inputs node selected, set Material Domain to Post Process
Add Texture Coordinate and Scene Texture nodes
With Scene Texture node selected, set Scene Texture Id to PostProcessInput0
Add custom node with the following settings
- 2 Input elements (UV & Scene Texture)
- Output Type of CMOT Float4
- Code section as follows:
```
int TexIndex = 2;
return SceneTextureLookup(UV, TexIndex, true);
```
Wire Texture Coordinate node into UV and Scene Texture node into Scene Texture
Add HueShift node
Wire Custom node into Texture (V3) input of HueShift
Add single constant node set to 50
Wire constant node into Hue Shift Percentage input
Wire Hue Shift result into Emissive Color of final inputs node
Apply and Save material
Add post process volume to the level
With the post process volume selected search for Blendables in the details panel
Add an element to the array and choose Assign Reference
Set the reference to the created material
PIE

Result:
When the character enters the post process volume, the editor crashes

Callstack

UE4Editor_Renderer!FSceneRenderTargets::GetGBufferResourcesUniformBuffer() [scenerendertargets.h:408]
UE4Editor_Renderer!FDeferredPixelShaderParameters::Set<FRHIPixelShader * __ptr64>() [scenerendertargets.cpp:2382]
UE4Editor_Renderer!FMaterialShader::SetParameters<FRHIPixelShader * __ptr64>() [shaderbaseclasses.cpp:254]
UE4Editor_Renderer!TBasePassPixelShaderBaseType<FNoLightMapPolicy>::SetParameters() [basepassrendering.h:392]
UE4Editor_Renderer!TBasePassDrawingPolicy<FNoLightMapPolicy>::SetSharedState() [basepassrendering.h:617]
UE4Editor_Renderer!FDrawBasePassDynamicMeshAction::Process<FNoLightMapPolicy>() [basepassrendering.cpp:383]
UE4Editor_Renderer!ProcessBasePassMesh<FDrawBasePassDynamicMeshAction>() [basepassrendering.h:985]
UE4Editor_Renderer!FBasePassOpaqueDrawingPolicyFactory::DrawDynamicMesh() [basepassrendering.cpp:444]
UE4Editor_Renderer!FRendererModule::DrawTileMesh() [renderer.cpp:80]
UE4Editor_Engine!FTileRenderer::DrawTile() [tilerendering.cpp:178]
UE4Editor_Engine!`FCanvasTileRendererItem::Render_GameThread'::`2'::EURCMacro_DrawTileCommand::DoTask() [tilerendering.cpp:326]
UE4Editor_Engine!TGraphTask<`FCanvasTileRendererItem::Render_GameThread'::`2'::EURCMacro_DrawTileCommand>::ExecuteTask() [taskgraphinterfaces.h:779]
UE4Editor_Core!FTaskThread::ProcessTasks() [taskgraph.cpp:539]
UE4Editor_Core!FTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:340]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:310]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:411]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:74]

Community References

Editor crashes when using diffuse scene texture in expression

UE4 crashes immediately when building lights

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Fixed

Component	UE - Graphics Features
Affects Versions	4.10
Target Fix	4.14

Fix Commit	3123503
Main Commit	3154728

Created	Jan 18, 2016
Resolved	Sep 13, 2016
Updated	May 2, 2018

UE-25623

[CrashReport] UE4Editor_Renderer!FSceneRenderTargets::GetGBufferResourcesUniformBuffer() [scenerendertargets.h:408]

[CrashReport] UE4Editor_Renderer!FSceneRenderTargets::GetGBufferResourcesUniformBuffer() [scenerendertargets.h:408]

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