Unreal Engine Issues
Unreal Engine Issues
Current animation asset is lost in animation preview when a post process anim BP is compiled
UE - Anim - Runtime - Anim Blueprints - Aug 3, 2020UDebugSkelMeshComponent and PreviewInstance are lost current animation asset. There are 2 ways to fix below void UDebugSkelMeshComponent::InitAnim(bool bForceReinit) { // If we already have Pre ...
ISequencer::OnPlayEvent does NOT fire at the end of playback in Sequencer editor
UE - Anim - Sequencer - Jul 8, 2022ISequencer :: OnStopEvent is executed when pause, but not when playing to the last frame and stopping automatically. This is because OnStopDelegate.Broadcast(); is only in FSequencer::Pause(). When ...
Static/stationary child actor components are invisible and/or move position when placed inside a dynamically loaded level
UE - Framework - Components - Oct 31, 2024When loading a non-world partitioned level into a persistent world partitioned level, parent actors with child actor components within the loaded map will move position or become invisible. Within t ...
Make literal container nodes (e.g. MakeArray) do not cast object ref output terms linked to interface-typed input pins.
UE - Framework - Blueprint - Jan 28, 2023As with most nodes, object reference outputs can be directly connected to interface-typed inputs on "make container" nodes (e.g. "MakeArray") if the object's class type implements the interface clas ...
[CrashReport] UE4Editor_Engine!FPhysScene::SyncComponentsToBodies_AssumesLocked() [physscene.cpp:1271]
UE - Simulation - Physics - Dec 1, 2017This is a common crash in 4.18 and 4.18.1. The callstack shares similarities to [Link Removed], although that has been confirmed fixed in 4.18. Included in the same crashGroup are also a few Ensur ...
Crash when enabling dynamic branch on static switches in Post Process Materials
UE - Rendering Architecture - Materials - Jun 28, 2023[Link Removed] Some functions to access parameters don't take into account the newly added runtime static switch parameters. It should be straightforward to fix these up: void UMaterialInstance:: ...
In 5.6, bWarningsAsErrors does not work with clang
UE - Foundation - Cpp Tools - UnrealBuildTool - Sep 20, 2025In 5.6, many warnings and errors specify their command line arguments to the compiler with these new C# attributes: [WarningsClangToolChain(["-Wno-date-time"], ["-Wdate-time", "-Wno-error=date-ti ...
MaterialTextureScale calculated incorrectly for materials with WorldPositionOffset
UE - Rendering Architecture - Materials - Apr 16, 2024When a Material uses WorldPositionOffset, the MaterialTextureScale is calculated incorrectly because FMaterialUtilities::ExportMaterialUVDensities() calls FMeshRenderer::RenderMaterialTexCoordScales ...
Multiple Materials not assigned to Mesh on Import
UE - Editor - Content Pipeline - Import and Export - Jan 6, 2017Not all material elements are created and assigned to the static mesh using multiple materials. With the attached mesh, only the first element is created and the other two are left non-existent. I c ...
TextRenderComponents not parallel safe. Can cause crash
UE - Graphics Features - Feb 28, 2017Licensee has reported intermittent crashes when loading a map that contains Child Actors with Text Render Components. When the child actor blueprint is spawned all of the text render components st ...