Unreal Engine Issues

Reflection Capture primitive invalidation in 5.3.1 causes massive hitches.

LLM: Delete LLM_IF_ENABLED if it is no longer a performance benefit, or convert all allocs and frees to use it if it still is.

The macros LLM and LLM_IF_ENABLED behave identically but are slightly different from a performance standpoint. For consistency all allocs and frees should use the same one. Measure the cost of a co ...

Shadow in Sky Reflections

It looks like the DistantScreenTrace(...) in LumenScreenTracing.ush reports a false positive hit in the dark regions. Using screen trace visualization reports the distance in these regions as 65535. ...

Creating a control rig via FControlRigBlueprintActions::CreateNewControlRigAsset crashes

FControlRigBlueprintActions::CreateNewControlRigAsset is crashing in ResolveObjectHandleNoRead.  Looking at the control rig in UControlRigBlueprint::Serialize, it's marked as pendingkill but I'm uns ...

Crash when opening or editing a DataTable with a Row Structure that contains a Curve

If a DataTable Asset is created with a Row Structure that contains a member variable of type Curve, the Editor will crash when attempting to open it while it has no rows. It will also crash when edi ...

ComponentOverlapMultiByChannel with a rotated simple collision PrimComp misses overlap vs. complex collision

UWorld::ComponentOverlapMultiByChannel and internally, the call to FBodyInstance::OverlapMulti, misses overlaps and blocking hits when the PrimComp's (the component used to test overlaps) mesh uses ...

Number of “USkeleton::LinkupCache” could keep increasing

USkeleton class only performs Add or Empty operations on the LinkupCache array and has no Remove, so the number of LinkupCache can keep increasing in some cases (A description in Step to Reproduce s ...

Landscape renders black when baking with GPU Lightmass

A user encountered an issue with Landscapes not rendering once baked with GPU Lightmass. The user was using Ray Tracing. If using normal CPU Lightmass baking, landscape remains the same. ...

Default Context Mappings Clearing Out Custom Triggers on module load

This is happening because UEnhancedPlayerInput::UEnhancedPlayerInput is attempting to load the IMC asset, but if your triggers are defined outside the engine module then it would trigger a load of t ...

Editor freezes when saving a MaterialInstance

UDN users have reported hangs in the material editor when editing specifi material instances. This seems to be a threading bug, as CompileDebugViewModeShaders()  is waiting for a shader compilation ...