Unreal Engine Issues
Unreal Engine Issues
[CrashReport] UE4Editor_Engine!UMaterialExpression::GetOutputType() [materialexpressions.cpp:859]
UE - Rendering Architecture - Materials - Nov 21, 2017This is an infrequent crash in the 4.18 release. Users have not provided any descriptions of their actions when the crash occurred. Source Context 849 uint32 UMaterialExpression::GetOutputT ...
Merged Instanced Static Meshes (Merge Actors tool) not visible when duplicated
UE - World Creation - Worldbuilding Tools - HLOD - Sep 19, 2018Instanced Static Mesh Actors created with (new in 4.20) ISM Merge tool do not immediately appear when duplicated. Confirmed in 4.21 Main @ CL 4374913 ...
Forward Rendering Lightmap Density view flicker
UE - Graphics Features - Aug 20, 2019The shaders flicker when in Lightmap Density viewmode after enabling Instanced Stereo Rendering in Project Settings > Engine > Rendering > VR Tested in 4.21.2 (CL - 4753647) 4.22.3 (CL - 7053647), ...
BP-implemented BT decorator issues with 4.6 to 4.7 upgrade
UE - AI - Jan 20, 2015Changes done to BTDecorator_Blueprint result in users not being able to upgrade their BP-implemented decorators to 4.7. ...
Crash when Playing in Mobile Preview with Capsule Direct Shadows
UE - Platform - Mobile - Jul 15, 2016When Capsule Direct Shadows are enable, attempting to play in Mobile Preview will cause the preview to crash. ...
Packaged project crashes when playing sound from blueprint library with enum input after nativizing blueprints
UE - Gameplay - Blueprint Runtime - Aug 23, 2016Packaged project crashes when playing sound from blueprint library with enum input after nativizing blueprints. Frequency: 5/5 Notes If nativize blueprints is turned off, the packaged project wor ...
Stop>Set Sequence>Play causes spawnables to be duplicated
UE - Anim - Sequencer - Aug 30, 2016Stop>Set Sequence>Play causes spawnables to be duplicated There is an alternate repro (see attached image) that uses Create Level Sequence Player, but that one seems expected since it is, well, cre ...
Auto-generated lightmap doesn't use some UV islands with the packed lightmap UV
UE - Graphics Features - Sep 20, 2016Some faces from the UV0 for the texture UV are not used when repacking for the auto-generated Lightmap UV even if the faces are split and visible in the UV0. Attached example mesh. ...
REGRESSION: HierarchicalInstancedStaticMeshComponent LOD transitions are broken in 4.9 and Main
UE - Graphics Features - Aug 24, 2015While testing another fix I noticed HISM LOD transitions are not working in Main or 4.9 branch. There is no screen-door effect and multiple LODs seem to be rendering simultaneously compared to 4.8. ...
Investigate code in SViewport.cpp that makes use of TWeakPtr's to see if it can be altered to better protect against a possible crash.
Tools - Aug 31, 2015A user reported a one-time crash that possibly occurred when a TWeakPtr became invalid immediately after passing an IsValid check, before the TWeakPtr could be used. The SViewport.cpp file contains ...