Unreal Engine Issues
Unreal Engine Issues
Curve editor (UMG) prevents Play in Editor if the a drag operation is interrupted with a right click
UE - Anim - Sequencer - Aug 1, 2016Curve editor (UMG) prevents Play in Editor if the a drag operation is interrupted with a right click. The user is given an error that they cannot play in editor while a drag operation is still on go ...
VolumeLightingSamples are not generated correctly
UE - Graphics Features - Lumen - Aug 30, 2019Lightmass.exe SampleVolume.cpp seems to generate VolumeLightingSamples correctly. After that, import processing is performed with Lightmass.cpp ImportVolumeSamples (), but it seems that it is not i ...
Engine build fails due to Unresolved External Symbol error after adding a new global variable to the Engine and then trying to reference it within Engine code
UE - Foundation - Cpp Tools - UnrealBuildTool - Feb 7, 2018Building the Engine in Visual Studio will fail due to an unresolved external symbol error if a new global variable is added to CoreGlobals.h and then referenced elsewhere in the Engine code. The bui ...
Investigate moving morph target mesh work from FSkeletalMeshLODRenderData::InitResources from Runtime Load to DDC/Cook
UE - Graphics Features - Mar 21, 2018See UDN Thread: Possibility for reducing loading times for morph targets by moving work to editor/cooker/ddc (whichever is appropriate) Loading times: Our model has ~70k verts and ~900 morphs – O ...
FARFilter does not exclude classes when told to
Tools - Oct 29, 2018If you look at the static method FilterByFloatRange inside AssetRegistryActor.cpp, you can see that the asset registry filter is set to recursively search paths and classes. It is also set to exclud ...
Plugin module is not reloaded when a game module that depends on the plugin module is hot reloaded
UE - Foundation - Cpp Tools - Hot Reload - Jun 28, 2018Performing a hot reload after modifying game code (plugin code is unmodified) does not also reload plugin modules. In the attached project, there are some log messages output when the plugin module ...
"Create Layers From Assigned Materials" assigns existing LayerInfos at random
UE - Graphics Tools - Terrain - Landscape - Jan 17, 2025The automatic landscape layer assignment that is performed when using "Create Layers From Assigned Materials" just uses the first layer info it finds with the layer's name, which leads to maps refer ...
Character unnecessary step down during PHYS_Flying mode
UE - Gameplay - Player Movement - Jan 15, 2026When MovementMode is set to PHYS_Flying, the character may unexpectedly step down by MaxStepHeight when colliding with a wall near a ceiling. This occurs because UCharacterMovementComponent::StepUp ...
Don't allocate landscape heightfield collision component scene proxies when Collisions display is off
UE - Graphics Tools - Terrain - Landscape - Nov 7, 2022ATM, ULandscapeHeighfieldCollisionComponent's scene proxy is created all the time, although it's only used for displaying collisions when Collisions mode is on. The scene proxies pre-allocate a very ...
Slow-rendering thumbnails can be queued up for real-time updates
UE - Editor - Content Pipeline - Content Browser - Sep 22, 2016A licensee is seeing performance drops while using the editor due to a custom thumbnail renderer taking a while to generate thumbnails while Real-Time Thumbnail rendering is enabled, and has request ...