Unreal Engine Issues
Unreal Engine Issues
MassInKg override resets to 0
UE - Simulation - Physics - Aug 23, 2016In the details for a Static Mesh Actor, MassInKg resets to 0 when the user tries to set it to something else. I couldn't reproduce this issue in 4.13. ...
Mover MoveDirectionIntent can be 0 due to interpolation
UE - Gameplay - Player Movement - Apr 22, 2025If two states have MoveDirectionIntent vectors that are opposite to each other, interpolating between these states can result in MoveDirectionIntent being 0. This may cause issues for animation blue ...
Editor Crashes When Count on Mid Node is Less Than 0
UE - Gameplay - Dec 29, 2016The editor crashes when the Count parameter passed into the Mid function is < 0. There is an assertion check(Count >= 0); in FString Mid in UnrealString.h, but an error message would be expected ...
Able to scale Math Hall graphs down to 0 which distorts them in ContentExamples
Docs - Samples - Sep 19, 2016All of the graphs in the Math_Hall can be scaled down to 0 which causes the graphs to appear distorted. These should probably be clamped as 1 since scaling them down to 0 does not show any useful in ...
InverseExposureLerp should return 1.0 when EYE_ADAPTION_DISABLED is 1
UE - Graphics Features - Sep 16, 2024Materials using EyeAdaptationInverse may render incorrectly when debug visualizations are active. This issue can be resolved by modifying the EyeAdaptionInverse function in EyeAdaptionCommon.us ...
WorldGridMaterial gets added as Element 0 when importing LOD model
When importing a LOD model, LOD material can get added as element 0, not preserving previous material assignment. It's not possible to re-order/delete the automatically added Element 0 WorldGridMat ...
Random number generator has a higher probability of returning 0 than any other number
UE - Foundation - Core - Mar 22, 2015I had a game that needed to generate hundreds of thousands of random numbers. (I was using the Blueprint "Random Float" node). There were a ton of 0.0 values generated, many more than any other n ...
[CrashReport] UE4Editor_UnrealEd!TArray<TSharedRef<FAssetThumbnailPool::FThumbnailInfo,0>,FDefaultAllocator>::AddUniqueImpl<TSharedRef<FAssetThumbnailPool::FThumbnailInfo,0> const & __ptr64>() [array.h:1805]
Tools - Sep 20, 2017This is a longstanding crash that occurs with low frequency per release, but has affected 400 users since the 4.11 release. Unfortunately among all of them, only one has provided any description. ...
Build fails due to potential divide by 0 error
UE - Graphics Features - Sep 29, 2017Shipping builds of the Engine fail when using the Visual Studio 2017 compiler due to a potential divide by 0 error. This is because the TotalColumnSize property of SMemoryStats is set to 0 by defaul ...
Editor crashes on Mac when launching with the command -MacExplicitRenderer=0
UE - Graphics Features - Jan 19, 2017Trying to launch the editor with the command -MacExplicitRenderer=0 causes a crash. At the time of the crash, the following line appears in the log:LogMac:Error: appError called: Assertion failed: A ...