Unreal Engine Issues
Unreal Engine Issues
Physics Constraint Component loss of accuracy
UE - Simulation - Physics - Mar 6, 2025Physics Constraint Component has lost accuracy between Unreal versions 5.2 and 5.4 (and up). When measuring the exact distance between rigid bodies constrained by a Physics Constraint Component, the ...
NavArea blueprints in Develops folders appear to have no affect
UE - AI - Nov 6, 2015If the user creates two NavArea Blueprints (one in the content folder and the other in a developer folder) if one is inside of a developer folder then it will appear to have no affect when it comes ...
FString.Mid doesn't react appropriately when given negative values for the Count variable
UE - Foundation - Core - Jul 16, 2015If you use a 5 character string (hello) to call the Mid function and provide 0 for start, -1 for count, it'll give you the entire string. This should either return an assert or treat all negatives a ...
Static meshes in a particle system are not affected by decals
UE - Graphics Features - Dec 21, 2017There is an issue where Static meshes in a particle system are not affected by decals, It is unsure if this is intentional behavior or not. This issue does not appear to be a regression Versions ...
Material editor crash in 5.0.2
UE - Rendering Architecture - Materials - Sep 2, 2022Overriding a sequence binding does not affect camera tracking binding
UE - Anim - Sequencer - Mar 17, 2020Binding overrides don't work for camera actor tracking. This may affect attach tracks as well. ...
4.22.1 Crash in FVulkanResourceMultiBuffer::Lock
UE - Rendering Architecture - RHI - Jul 31, 2019Vulkan Multibuffer Lock mechanism for ReadOnly does not appear to be implemented. Temporary workaround has been provided to licensee. ...
SSR on Translucency is not affected by Post Process Volume
UE - Graphics Features - May 24, 2018Screen space reflections on translucent materials are not affected by post process settings. Any changes made to SSR settings in the volume will do nothing to a material that is set to the transluce ...
[Mobile/Forward Rendering] PlanarReflection does not work when the reflection plane faces certain directions
UE - Platform - Mobile - Sep 24, 2025Note: This repros on 4.27 and all 5.x versions. When using the mobile renderer and/or forward shading, Planar Reflection will simply not work if the reflection plane normal has components that add ...
Crash when using merge actor on static meshes that have been affected by simplygon
UE - Gameplay - Oct 5, 2016Crash when using merge actor on static meshes that have been affected by simplygon ...