Unreal Engine Issues

FMath::TruncToInt() may result in incorrect data being returned in instances when a Double is passed in containing a large integer value

The FMath::TruncToInt() function takes a float parameter, but some calls to this function pass in a double value. For most use cases, this will probably work fine. However, if the integer values are ...

Crash when implementing interface to child blueprint and then implementing it with parent blueprint

If the user uses a Blueprint Interface in children Blueprints and then goes to the parent Blueprint and tries to implement the same Blueprint Interface in the parent Blueprint, the editor will crash ...

Investigate UMG animation duplication

A licensee is reporting UObject spikes (with a noticeable GC impact) in UWidgetBlueprintGeneratedClass::InitializeWidgetStatic. This may be caused by our duplication of UMG animations when initializ ...

Motion Blur creates dark artifacts on bottom of screen in editor

When motion blur is active and the view port is in motion there will be a dark artifact visible at the bottom of the screen. Normally this isn't very noticeable however the effect worsens with speed ...

iOS Multiplayer Join Session does not function.

iOS Game Center multiplayer create session does not function or crashes app. ...

Sequencer audio doesn't play after rendering a movie in editor

FSkeletalMeshMerge::CalculateLodCount calculates minimum LODs improperly

CalculateLodCount tries to bound the output LOD count as at least one (count >= 1), but actually bounds it as no more than 1 (count <= 1). Just need to change a FMath::Min to FMath::Max. ...

Motion Blur has noticeable Artifacts when rotating Camera

When rotating a camera about an actor the motion blur starts to create blocky/pixelated artifacts around the character in a halo. This can be further exaggerated by moving the actor while rotating t ...

Scene color is copied every draw call if materials read from it (redundant copy optimization is broken)

See TranslucentRendering.cpp // todo: this optimization is currently broken DrawingContext.bSceneColorCopyIsUpToDate = (DrawingContext.TranslucenyPassType == ETranslucencyPass::TPT_Separat ...

Skylight does not honor the Visibility settings when hidden

The Skylight actor cannot be disabled when using 'Hide' from the right-click context menu or using the visibility eye icon in the World Outliner. ...