Unreal Engine Issues
Unreal Engine Issues
Particle Random Value is the same for all particles with a Niagara Mesh Renderer
UE - Rendering - Architecture - Niagara - Sep 28, 2026A material using the Particle Random Value node returns the same value for every particle drawn by a Niagara Mesh Renderer. Particle transforms are not affected, only the random value. This happens ...
Overridden functions in Child Blueprints cannot be converted to/from pure functions
UE - Gameplay - Blueprint - Jun 27, 2015Overridden functions in Child Blueprints cannot be converted to/from pure functions. Reproduced in 4.8.1 and Main (//depot/UE4/Promotable-CL-2601051) ...
Garbage Collection Causes Lag in MAC Project
UE - Foundation - Core - Sep 18, 2015User reports lag regardless of the Garbage Collection settings, EXCEPT: If the user changes settings to 3 then lag becomes more frequent (approximately every 3 seconds verses every 5 seconds.) *Wa ...
Post Process Material: different color behavior in Sequencer Render vs Movie Render Queue
UE - Anim - Sequencer - May 21, 2020During lookdev, I use a post process material to bring reference images into the engine to compare against my work. The goal is for the reference image to not be touched by any of the Unreal color ...
Handheld AR On IPad Has Dark Contrast Issues And Constant Screen Tearing When Mobile HDR Is Disabled
UE - Platform - XR - Mar 4, 2020When MobileHDR is disabled in a packaged AR project for iOS there is a big constrast with the brightness in the image and constant screen tearing. This is happening specifically with images captured ...
Blueprint Tooltips Appear Behind Contextual Menu
Tools - Nov 30, 2015On an iMac running OSX 10.11.1 a user reports that the tooltips are appearing behind the contextual menu. *See image ...
Use Single Process settings adjusted while Use Single Process is disabled are retained while Use Single Process is enabled
UE - Networking - Jul 1, 2015Use Single Process settings adjusted while Use Single Process is disable are retained while Use Single Process is enabled. This can be problematic when there are issues with having Use Single Proces ...
Misaligned sampling in UI Material with with CustomStencil
UE - AI Workflows - UI Systems - May 19, 2025The output of the CustomStencil node in a User Interface material does not align with the viewport dimensions. Toggling fullscreen/windowed mode (F11) causes the offset to reappear, so scaling the n ...
AnimNotify serialization crash in editor
UE - Runtime - Animation - Mar 15, 2026The crash is caused by changing the variable type of an AnimNotify that is already referenced by a montage. This issue cannot be reproduced in 5.6. ...
Adding ProceduralMeshComponent Class to a project prevents the code from compiling
UE - Gameplay - Aug 5, 2016After adding a classed based on ProceduralMeshComponent the code for the project does not compile any longer. **This is a Regression - Adding ProceduralMeshComponent class would compile successfull ...