Unreal Engine Issues
Unreal Engine Issues
HideBoneByName translates bone to parent which breaks skinning
UE - Anim - Jul 30, 2024Calling HideBoneByName on a bone causes that bone (and all it's children) to be translated to the parent bone's location. This code in UpdateRefToLocalMatricesInner is responsible: bool bNeedToHid ...
Landscape has a seam when scale is set to a decimal
UE - Graphics Tools - Terrain - Landscape - Jan 13, 2023Regression: Tested in UE5/Release-5.0 at CL 20979098, this issue does occur so it is not a regression. This issue occurs if the scale set for the landscape has a decimal value that is not 0.5. Sett ...
LiDAR not importing colors correctly for .E57 Point Clouds
UE - Editor - Content Pipeline - Jan 6, 2023Reproduced 3/3 times, issue does not occur in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed Regression. LiDAR plugin is version .08 in UE5.0.3, and version 1.0 in UE5.1.0 ...
Reimporting an asset during PIE overwrites the bAllowCPUAccess value to true
UE - Editor - Content Pipeline - Import and Export - May 22, 2025When reimporting a static mesh asset before PIE execution, the value of bAllowCPUAccess is false. If reimporting a static mesh asset while PIE is running, the value of bAllowCPUAccess is true. In a ...
Incorrect config property serialization for UStructs used as TMap keys or contained in a TSet with a single value. Diffs taken from default-value of each member type, instead of from default-value of the struct
UE - CoreTech - Nov 18, 2024Consider a UStruct with some basic type members, each one with a default value specified in the struct. Also consider a TSet or TMap with that struct as keys, used inside a UObject as a UProperty an ...
Lumen tile classification flicker
UE - Graphics Features - Lumen - Apr 19, 2023While we suggest using screenpercentage at 25%, it is visible at higher percentages. Video showing the flickering:https://udn.unrealengine.com/s/contentdocument/0694z00000Qw4jPAAR ...
Characters can not pass through back faces of triangle meshes
UE - Simulation - Physics - Query - Jan 17, 2023Here is a work around bool FTriangleMeshSweepVisitor::VisitSweep(const TSpatialVisitorData<int32>& VisitData, FRealSingle& CurDataLength) { ... if (CullsBackFaceSweepsCode != 0) { if ...
Sphere Mask ArgInvHardness missing multiplication
UE - Rendering Architecture - Materials - Jun 27, 2025Hi Epic, In MaterialExpressions.cpp UMaterialExpressionSphereMask::Compile(), hardness is not calculated the same way in both <if> conditions. One is missing a multiplication by 0.01f. Specificall ...
Legacy HLOD Nanite Meshes Always Rendering in 5.5
UE - World Creation - Worldbuilding Tools - HLOD - Mar 17, 2025From licensee: We are using the legacy HLOD system in our game. With 5.5 there was a change to FSceneProxyBase::DrawStaticElementsInternal() where the implementation was removed (https://github.com ...
GAS: Duration GameplayEffects applying same GameplayCue tag will on authority end all on-going GameplayCueNotifies when first cue expires
UE - Gameplay - Gameplay Ability System - Aug 16, 2024When multiple duration GameplayEffects apply a GameplayCue with the same tag, the network authority game instance (standalone & servers) will remove all GameplayCues with that tag from the AbilitySy ...