Unreal Engine Issues

Level Instancing and Is Editor Only Actor flag

WP handles PIE Editor only properly (doesn't load the actors at all) but the old level streaming system just hides them through the FPrimitiveSceneProxy. So in this instance, the bug is that the Lev ...

Cooking crash during shutdown with no useful error

Sometimes some of actors are destroyed after the destruction of the solver through the garbage collector. In this case, the app crash in FChaosScene::RemoveActorFromAccelerationStructureImp because ...

Reference to control rig can be lost on actors with multiple skeletal mesh components

In the attached project, when we initially add a control rig track for the actor with multiple skeletal mesh components, we add the control rig for the correct component because FControlRigParameter ...

Materials are added to a Model that has been modified by Cube Grid

This is not a regression. Tested in //UE5/Release-5.1 CL23901901 Changing materials before making a change to a model with cube grid causes that previous selected material to be added to the model ...

Validate whether the usage of FPIEFixupSerializer can be removed from UWorld::DuplicateWorldForPIE

UnkownRef Mips can cause TextureStreaming peaks during loading

UnkownRef Mips is meant to fix/workaround the problem where some textures are used for rendering but they don't have any component references them (such as texture used by PP effects) These UnkownR ...

Decals Normal only + Material Attributes

This does not just work with BaseColor, you can affect any of the outputs by connecting something to a disconnected CreateMaterialAttributes. ...

Add support for referencing non-spatially loaded actors without clustering them together.

The engine doesn't allow cross-level references as it assumes a referenced object is immediately available which we guarantee by placing any reference clusters into the same cells. This means the be ...

ApplyRootMotion**** ability tasks broadcast completion events before calling EndTask

Several ability tasks used to apply root motion sources on Characters have ordering problems between on-completion style events and ::EndTask / OnDestroy. UAbilityTask_ApplyRootMotionMoveToForce is ...

HighResScreenshot crashes in windows packaged exe

FHighResScreenShotConfig::Init() sets the materials only in the Editor, due to a #if WITH_EDITOR block. However, the FViewport class exposes the TakeHighResScreenShot to non-editor builds as well, l ...