Unreal Engine Issues
Unreal Engine Issues
Animations don't update on the first frame of shots
UE - Anim - Sequencer - Jul 11, 2018Looks like this only happens for shots. I think this is because the tick prerequisites get set up on the frame of evaluation, and the skeletal mesh component doesn't get ticked until the next frame. ...
FTransform(ENoInit) ensures in Debug on mobile platforms
UE - Foundation - Core - Sep 25, 2018As of 4.20, ENABLE_NAN_DIAGNOSTIC is now enabled in all Debug configurations. However, this does not work well with the TransformNonVectorized that is used on platforms like android. If this combina ...
Nearest Filtering on Vulkan doesn't work on some kinds of Android Devices
UE - Platform - Mobile - Feb 21, 2019The licensee reported "Nearest" filtering on Vulkan doesn't work on some kinds of Android devices.[Link Removed] I was able to repro this issue on Pixel3 but wasn't able to repro it on Xperia X Per ...
Massive FPS drops in editor when moving mouse over menu items on Linux
UE - Platform - Linux - Apr 22, 2019Navigating various dropdown menus in the Editor causes the FPS to drop down to around 25 or 10 in the Viewport on an empty project. This does not reproduce on Windows with -vulkan This issues was ...
HiResScreenshot has incorrect masking when screenshot resolution scale does not match the viewport.
UE - Rendering Architecture - RHI - Sep 6, 2021After a bit of investigation, the way to fix this would be to modify MergeMaskIntoAlpha to pass in the actual resolution scale and the requested size, and only mask the overlapping pixels. Currently ...
GeometryCollectionPhysicsProxy::FieldParameterUpdateCallback() not removing invalid Commands, leading to performance issues
UE - Simulation - Physics - Destruction - Aug 30, 2025GeometryCollectionPhysicsProxy::FieldParameterUpdateCallback() not removing invalid Commands, leading to performance issues. The licensee has provided their analysis: We seem to have stumbled acro ...
Vertex Paint on Static Mesh Component in BP is lost on Packaged and Standalone Game
UE - Gameplay - Blueprint - Mar 10, 2016BP Static Mesh Components are not retaining the vertex color applied to them in a level when you play in Standalone or Package a Project. You will get the correct results however when you PIE. Thi ...
Enabling Allow Client Side Navigation results in a NavMesh Needs To Be Rebuilt error message on the Client
UE - AI - Dec 7, 2015Enabling Allow Client Side Navigation results in a NavMesh Needs To Be Rebuilt error message on the Client. The Client cannot use the nav mesh. This is a regression: this did not occur in 4.9.2 (th ...
Inconsistent mobility when converting selected actors to a blueprint
UE - Gameplay - Blueprint - Jan 6, 2015Noticed when replying to a user on the forums (link included) When using the "Convert to Class Blueprint" feature in the level editor to create a blueprint from the selected actors, the created blu ...
Adding Multiple Scene Components to an Actor Causes Parenting Errors
UE - Gameplay - Components - Jan 5, 2016Attempting to add multiple instances of a Scene Component that was created in code and contains a component such as a Box Collider causes the Box Colliders of each Scene Component to be parented to ...