Unreal Engine Issues
Unreal Engine Issues
Flickering artifacts are rendered when using Sky Atmosphere Component with Vulkan
UE - Rendering Architecture - RHI - Jul 16, 2020Rendering the SkyAtmopshere component using Vulkan with and without Vulkan (SM5) enabled causes artifacts to appear on screen on Windows and Linux. This was reported and tested in 4.25.1 (CL-135 ...
The GetCombinedForces put out wrong value when the vehicle is reversing
UE - Simulation - Physics - Aug 19, 2022Reproduced 3/3 times. A similar bug occurred with PhysX ([Link Removed]) Check the function: FVector FSimpleAerodynamicsSim::GetCombinedForces(float VelocityIn) if the velocityIn is negative, th ...
Engine freezes when Level Sequence format is in seconds
UE - Anim - Sequencer - May 22, 2023When using the jumpbox with a sequence that is in seconds (not fps) the engine will freeze. This issue is occurring in Binary //UE5/Release-5.2 @ CL 25360045 This issue is occurring in Binary //UE ...
Within Water Body Custom setting the Water Mesh Override to a Nanite mesh causes a crash
UE - Graphics Tools - Terrain - Water - Jun 28, 2023This is not a regression. Tested //UE5/Release-5.1 CL23901901 Within Water Body Custom setting the Water Mesh Override to a Nanite mesh causes a crash. This seems to be the case with any Nanite ena ...
Non-edit layers landscape don't work adequately with Nanite landscape while painting
UE - Graphics Tools - Terrain - Landscape - Oct 24, 2023Result : while displaying the Nanite version of the landscape, the paint layers behave erratically (see video : [Link Removed]) If rebuilding the Nanite data, the bug gets fixed until the user sta ...
Regression: FGameplayTag and FGameplayTagContainer pin value modification is not undo/redoable
For nodes with an FGameplayTag or FGameplayTagContainer pin, when changing the tag value (Pin->DefaultValue) and triggering Undo/Redo, the pin modification is not undone. Rather, it undoes the previ ...
ExportMaterialUVDensities() gets the incorrect value where the alpha channel is referenced
UE - Rendering Architecture - Materials - Apr 16, 2024ExportMaterialUVDensities() gets the incorrect value where the alpha channel is referenced (e.g. RegisterIndex of the texture is [3] or [7]) because FMeshRenderer::RenderMaterialTexCoordScales() use ...
bIncludeComponentLocationIntoBounds breaks bounds calculations
UE - Anim - Runtime - Aug 13, 2025Bounds generation when bIncludeComponentLocationIntoBounds is active is broken. Both the calculation of the local bounds and the world bounds are incorrect (see screenshot). When that flag is acti ...
Physics Mover: AI movement and collisions can cause sharp increase in velocity
UE - Gameplay - Player Movement - Mover - Aug 19, 2025A pawn using the physics mover and using AI movement can sometimes gain an ton of velocity quickly upon colliding with another physics object. It seems to fix it self and revert back to it's origina ...
MetalRHI Asserts When Using "Profile GPU" With RHI-Thread/Parallel-Execution
UE - Graphics Features - Sep 14, 2016When the RHI thread is enabled (with or without parallel-execution) for Metal it isn't currently possible to run "profilegpu" because the GPU timestamp emulation code isn't multi-thread safe and pro ...