Unreal Engine Issues and Bug Tracker (UE-65064)

Description

Licensee wants to be able to import skeletal meshes which have Vertex Colours (their entire game is Vertex Coloured) and Morph Target animation, but they're seeing a crash when toggling Vertex Colors on the Animation.

This crash has been tested and reproduced in: 4.19.2 (CL-4033788), 4.20.3 (CL-4369336),
4.21 (CL-4435822), and Main 4.22 (CL-4448303)

Steps to Reproduce

Download the attached assets
Open the UE4 Editor and create a Blank project
Close the Project
Add the downloaded assets to the projects Content folder
Reopen the Project
Click on the Skeletal mesh and assign the associated Skeleton to it. Do the same for the Animation Sequence.
Open up the Animation Sequence and click on Character>Mesh>Vertex Colors

Results:The Editor crashes

Expected: The Editor doesn't crash

Callstack

[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x000000002F5C50D8 KERNELBASE.dll!UnknownFunction []
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x000000000D7E7884 UE4Editor-ApplicationCore.dll!FWindowsErrorOutputDevice::Serialize() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\applicationcore\private\windows\windowserroroutputdevice.cpp:65]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000EA666D9B UE4Editor-Core.dll!FOutputDevice::LogfImpl() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000EA5A1949 UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:419]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000DF330A6F UE4Editor-Engine.dll!FMaterial::GetShader() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\materials\materialshared.cpp:1915]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D94CD7BF UE4Editor-Renderer.dll!GetUniformBasePassShaders<0>() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.cpp:868]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D94C223E UE4Editor-Renderer.dll!GetBasePassShaders<FUniformLightMapPolicy>() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.cpp:936]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D94F682D UE4Editor-Renderer.dll!TBasePassDrawingPolicy<FUniformLightMapPolicy>::TBasePassDrawingPolicy<FUniformLightMapPolicy>() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.h:1040]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D94CE18B UE4Editor-Renderer.dll!FDrawBasePassDynamicMeshAction::Process<FUniformLightMapPolicy>() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.cpp:649]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D94CEC52 UE4Editor-Renderer.dll!ProcessBasePassMesh<FDrawBasePassDynamicMeshAction>() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.h:1578]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D952354E UE4Editor-Renderer.dll!FBasePassOpaqueDrawingPolicyFactory::DrawDynamicMesh() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.cpp:709]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D9557AA2 UE4Editor-Renderer.dll!FDeferredShadingSceneRenderer::RenderBasePassDynamicData() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.cpp:1162]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D9558D93 UE4Editor-Renderer.dll!FDeferredShadingSceneRenderer::RenderBasePassView() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.cpp:1369]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D95575BD UE4Editor-Renderer.dll!FDeferredShadingSceneRenderer::RenderBasePass() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\basepassrendering.cpp:984]
[2018.10.11-12.09.02:844][280]LogWindows: Error: [Callstack] 0x00000000D95DAFE0 UE4Editor-Renderer.dll!FDeferredShadingSceneRenderer::Render() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:989]
[2018.10.11-12.09.02:845][280]LogWindows: Error: [Callstack] 0x00000000D9B95F31 UE4Editor-Renderer.dll!RenderViewFamily_RenderThread() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\scenerendering.cpp:2749]
[2018.10.11-12.09.02:845][280]LogWindows: Error: [Callstack] 0x00000000D9B79E04 UE4Editor-Renderer.dll!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`33'::EURCMacro_FDrawSceneCommand>::ExecuteTask

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Fixed

Component	UE - Graphics Features
Affects Versions	4.19.2, 4.21, 4.22, 4.20.3
Target Fix	4.21

Fix Commit	4480511
Main Commit	4626501

Created	Oct 11, 2018
Resolved	Oct 17, 2018
Updated	Dec 4, 2018

View Jira Issue

UE-65064

Editor Crashes when enabling Vertex Colors on an imported Skeletal Mesh with Morph Target Animations

Editor Crashes when enabling Vertex Colors on an imported Skeletal Mesh with Morph Target Animations

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