The HISM will have double drawcalls when player opens r.Mobile.AllowDitheredLODTransition

UE - World Creation - Worldbuilding Tools - Foliage - Nov 2, 2020

Please check the Function GetDynamicMeshElements in HierarchicalInstancedStaticMesh.cpp. The  Function Traverse in GetDynamicMeshElements will always return two Lod levels, even the transition is f ...

Blueprint class's property is overridden by parent blueprint class

UE - Gameplay - Components - Nov 2, 2020

I did some research. The problem is caused in CoreNative.cpp. In Function GetInstancedSubobject (Line 126) We should check if instance is runtime instance first. If it is runtime instance, just us ...

Destroying a camera actor makes the level Dirty

UE - Graphics Features - Oct 29, 2020

This does not occur except for Camera actors. ...

Volume EncompassesPoint is broken in Chaos

UE - Simulation - Physics - Oct 26, 2020

While investigating an issue with Cull Distance Volumes, I noticed that AVolume::EncompassesPoint has a broken default implementation when WITH_PHYSX is not defined. If only chaos is enabled it will ...

Anim Notifies Color does not change when typing on the keyboard

UE - Anim - Runtime - Anim Blueprints - Oct 26, 2020

If change the color by dragging the mouse, it will be applied normally. ...

Can't Play In Editor after editing color value in color picker

UE - Anim - Runtime - Oct 23, 2020

Can not launch PIE after set the value in color picker window to enter a number from the keyboard. Choose the color value with the picker or close the window with the Cancel button to return to it.  ...

SessionFrontend Causes Lost Audio on iOS After Switching Apps

UE - Audio - Oct 20, 2020

When using SessionFrontend on some devices, when leaving the app (going to the home screen or another app) or sometimes locking the device there is no more audio after returning to the game. "It lo ...

Image appears upside down when using Export Render Target on Android

UE - Platform - Mobile - Oct 16, 2020

Image appears to be upside down Bug was checked on production, engine version 4.25.3 and is NOT reproducible  Regression = yes ...

Array references are not recognized in Blueprint

UE - Gameplay - Oct 12, 2020

Link to test project: [Link Removed] In BP_MyPlayerController event graph, “T” is bound to a Blueprint function called “BPSetMyArrayElement0To5”. “BPSetMyArrayElement0To5” calls the C++ function ...

Undo function breaks local variables in Blueprint Function after compiling

UE - Gameplay - Oct 8, 2020

Blueprint functions appear to correctly associate local variables when renaming the function. However when undoing a rename with ctrl-z the local variables appear to lose their association. Redoing ...