Unreal Engine Issues
Unreal Engine Issues
Simulated physics after a delay causes physics objects to fall through one another if their collision is overlapping
UE - Simulation - Physics - Apr 25, 2016Actors that simulate physics after a delay will fall through other physics actors if their collision is touching or overlapping. Note May be related to [Link Removed] Regression? (No), issue (doe ...
Datatable shows serialization of struct variables within a struct
Tools - May 18, 2016If a datatable is created from a struct containing another struct, added rows will show serialization values in the datatable editor for struct variables. Regression (No) issue (does) occur in 4.1 ...
Setting a value Material Parameter Collection to Material will cause crash
UE - Graphics Features - May 2, 2016Adding a Material Parameter collection to a material, setting its value, then saving the material will cause a crash. This was only able to be reproduced on Mac and did not affect the Windows versio ...
OnClicked event of UMG button fires once in twice if virtual joystick is receiving input.
UE - Editor - UI Systems - Oct 14, 2015OnClicked event of UMG button fires once in twice if virtual joystick is receiving input. Both Andorid and iOS devices are affected. This issue is found with 4.9 update. under 4.8 are fine. ...
Animation Track in Shot Does Not Animate With Evaluate Sub Sequences In Isolation Enabled
UE - Anim - Sequencer - May 15, 2018When Evaluate Sub Sequences in Isolation is enabled in a shot, other shots inside the same sequences only play the transform track and do not play their animation track Does not affect 4.18.3 Relat ...
Disabling "Apply Fogging" Doesn't Work for Translucent Material with Volumetric Fog
UE - Graphics Features - Jul 6, 2018Translucent materials with "Apply fogging" disabled will be affected by volumetric fog. Found in 4.19 CL# 4033788, 4.20 Preview 5 CL# 4173640, and 4.21 ...
Default Values missing from Local Variables in Blueprint Actor Construction Script
UE - Gameplay - Sep 19, 2019Specific to the Blueprint Construction Script, Local Variables cannot have their value set in the Editor, because the "Default Value" section of the Details tab will never appear. This only affects ...
Lumen interior light leaking occurs with realistic sun Lux values (20k)
UE - Graphics Features - Lumen - Aug 23, 2024When a realistic sun Lux value of 20,000 for the sun directional light, interior light leaking is much more pronounced then when using the default directional light Lux value of 10 Lux. ...
Missing materials on the rear lights of library vehicles
TM - Content - Oct 24, 2025Reported in SF [Link Removed] The rear light material on Twinmotion library vehicles is not present on many vehicles in TM 2025.2. Confirmed affected vehicles are in the following categoriesCarsTw ...
Framerate drops when using SceneCaptureComponents with a RenderTarget in VR
UE - Platform - XR - May 14, 2018Using SceneCapture in packaged VR projects causes poor performance. Also observed with SceneCaptureCube Does not occur in 4.18 ...