This is a regular crash that has occurred through 4.16 and into the 4.17 previews.
The callstack is similar to [Link Removed] (invalid), although the error message is different.
User Descriptions
Source Context
367 //@todo - fix 368 OutMaterialRenderProxy = Mesh.MaterialRenderProxy; 369 370 FDrawingPolicyRenderState DrawRenderState(View); 371 372 DrawingPolicy.SetupPipelineState(DrawRenderState, View); 373 CommitGraphicsPipelineState(RHICmdList, DrawingPolicy, DrawRenderState, DrawingPolicy.GetBoundShaderStateInput(View.GetFeatureLevel())); 374 DrawingPolicy.SetSharedState(RHICmdList, DrawRenderState, &View, FConvertToUniformMeshDrawingPolicy::ContextDataType()); 375 376 for (int32 BatchElementIndex = 0; BatchElementIndex < Mesh.Elements.Num(); BatchElementIndex++) 377 { 378 //@todo - fix 379 ***** OutPrimitiveUniformBuffer = IsValidRef(Mesh.Elements[BatchElementIndex].PrimitiveUniformBuffer) 380 ? Mesh.Elements[BatchElementIndex].PrimitiveUniformBuffer 381 : *Mesh.Elements[BatchElementIndex].PrimitiveUniformBufferResource; 382 383 DrawingPolicy.SetMeshRenderState(RHICmdList, View, PrimitiveSceneProxy, Mesh, BatchElementIndex, DrawRenderState, FConvertToUniformMeshDrawingPolicy::ElementDataType(), FConvertToUniformMeshDrawingPolicy::ContextDataType()); 384 DrawingPolicy.DrawMesh(RHICmdList, Mesh, BatchElementIndex); 385 }
repro steps currently unknown
Assertion failed: UniformBufferRHI.GetReference() [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\RenderCore\Public\UniformBuffer.h] [Line: 84] UE4Editor_Renderer!FUniformMeshConverter::Convert() [converttouniformmesh.cpp:380] UE4Editor_Renderer!GenerateSurfelRepresentation() [surfeltree.cpp:301] UE4Editor_Renderer!ProcessPrimitiveUpdate() [distancefieldobjectmanagement.cpp:800] UE4Editor_Renderer!FDeferredShadingSceneRenderer::UpdateGlobalDistanceFieldObjectBuffers() [distancefieldobjectmanagement.cpp:1110] UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [deferredshadingrenderer.cpp:605] UE4Editor_Renderer!RenderViewFamily_RenderThread() [scenerendering.cpp:1850] UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`26'::EURCMacro_FDrawSceneCommand>::ExecuteTask() [taskgraphinterfaces.h:784] UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:650] UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:559] UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:325] UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:459] UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-48040 in the post.