Unreal Engine Issues
Unreal Engine Issues
Unable to change/edit elements of Blueprint instances of Actor Component set UObject arrays
UE - Gameplay - Components - Nov 20, 2016When an array of custom UObjects is defined in an actor component class, blueprint instances of the component class cannot update the array elements. Array elements only update inside the blueprint ...
If something is blocking the One File Per Actor file, you can delete the actor inside Unreal, but the file won't be deleted and will reappear after the map is reloaded.
UE - World Creation - Worldbuilding Tools - OFPA - Nov 14, 2022Licensee:Artist reported removed actors reappearing I suspect that file got loaded by something and tested what going to happen if you open a file for read I used python to test lock_file = R'C ...
Key precision problems on some short animations
Tools - Apr 5, 2016Please see attached UE4_anim_interp_bug.fbx for a second example. This works as expected in 4.7 and 4.8 I've got a couple different users reporting this now. I suspected animation compression to ...
Asset Manager settings that worked in 4.26 now have extra invisible broken types
UE - Foundation - Data Pipeline - Cooker - Sep 23, 2021For 4.27/5.0 (as part of [Link Removed]) we changed the asset manager's settings to be a key-indexed config array which gives more safety with removing entries via the UI. However, this actually bro ...
Animation curves on Montages are not remapped when using a 'Compatible' skeleton
UE - Anim - Runtime - Jun 27, 2023[Link Removed] From UDN: If you are using the new compatible skeletons feature and you have a Montage with an attribute curve on it, the curve is not correctly mapped to the target skeleton. So ...
Landscapes cause Vulkan crash related to GRHISupportsAttachmentVariableRateShading
UE - Rendering Architecture - RHI - Nov 7, 2022Binary (Installed Build)//UE5/Release-5.1 @CL22986940 I encountered this same crash when creating a landscape twice, but was not able to consistently reproduce it with those steps. I figured out th ...
On Hit Events are inconsistent/inaccurate when using Substepping most notably at lower frames per a second
UE - Simulation - Physics - Dec 9, 2021This is a regression Tested in: //UE4/Release-4.27 CL18319896 Binary //UE5/Release-5.0-EarlyAccess CL16682836 Binary Under the same conditions in UE4 the On Hit events fire accurately and as expect ...
Sequencer: No preview animation shown without an animation track
UE - Anim - Sequencer - Apr 2, 2019From User: "Sequencer: When using an animBP there's no animation at all (preview) without an animation in the animation track. Strangely enough the animation BP starts running if you add any animat ...
LODs screen sizes in legacy assets are incorrectly converted to all have the same value on load
UE - Editor - Content Pipeline - Sep 11, 2025When loading a static mesh asset created in an old version of Unreal (e.g. 4.10), all LODs have their Screen Size property set to the same value (approximately 1.5). This happens because the static ...
Foliage lightmaps for LODs does not look correct
UE - World Creation - Worldbuilding Tools - Foliage - Jun 21, 2016When using the foliage tool with any mesh that has a LOD the lightmap generates artifacts for the instance. The base LOD will have correct looking lightmaps, however when pulling back and seeing the ...