Saving Level changes the Rotation of actors with parent-child relationships

UE - Gameplay - Components - Nov 14, 2019

According to the licensee report, UnrealMath.cpp (588) constfloat SINGULARITY_THRESHOLD = 0.4999995f; It seems that this can be avoided by changing the above value. However, changing SINGU ...

Unexpected Phat constraint skeleton tree search behavior

UE - Simulation - Physics - Nov 14, 2019

The skeleton tree search does not search for constraints based off of their full displayed name in the tree. Only their second bone name is used when filtering (despite portions of their full name s ...

SetHitResultFromShapeAndFaceIndex crash

UE - Simulation - Physics - Nov 15, 2019

SetHitResultFromShapeAndFaceIndex calls  if(PxMaterial* PxMat = PShape->getMaterialFromInternalFaceIndex(FaceIndex)) { OutResult.PhysMaterial = FPhysxUserData::Get<UPhysicalMaterial>(PxMat->userD ...

Override Animation Data doesn't use new animation

UE - Anim - Rigging - Nov 20, 2019

Override Animation Data doesn't use the new animation to play when the animation mode is already 'Use Animation Asset' ...

Crash when changing "MaximumTextureSize" in "LeaveExistingMips" state

UE - Editor - Content Pipeline - Import and Export - Dec 2, 2019

No problem with 4.22.3 ...

Unwanted black boundaries are displayed in a vertical split-screen with 3 players.

UE - Gameplay - Dec 2, 2019

Floating point error from UGameViewportClient::SplitscreenInfo causes this issue. FMath::TruncToInt( 3240 /*ViewportSize*/ * 0.333f/*Ratio in SplitScreenInfo*/ ) = 1079 I suggested a following t ...

Niagara system loses source emitters when moving Engine from 4.22 or earlier to 4.23 or later.

UE - Niagara - Nov 29, 2019

The following code causes this behavior.// NiagaraSystem.cpp for (FNiagaraEmitterHandle& EmitterHandle : EmitterHandles) { EmitterHandle.ConditionalPostLoad(NiagaraVer); if (!EmitterHandl ...

LOD distance does not match between StaticMesh and SkeletalMesh

UE - Rendering Architecture - RHI - Nov 26, 2019

None referenced NiagaraEmitters are contained in packaged game

UE - Niagara - Nov 28, 2019

[Image Removed] It's just storage waste. Because those assets will be never loaded on runtime. ...